我在android应用程序中点击忘记密码文本视图，从一个活动切换到另一个活动时遇到了问题

我制作了一个Android电子商务应用程序，使用firebase进行身份验证。在登录活动中，我添加了一个textview忘记密码，用户将在其中单击该密码并立即转到重置活动页面。但当我点击textview时，我的应用程序停止工作。我在忘记密码的textview上添加了onclickListener选项，但它仍然不工作。这是我的密码

后勤活动：

forgotPassword = (TextView) findViewById(R.id.forget_password_link);  
forgotPassword.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent i=new Intent(LoginActivity.this,ResetActivity.class);
                startActivity(i);
                Toast.makeText(LoginActivity.this,"Go to Reset password",Toast.LENGTH_LONG).show();
            }
        });

 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.registerlogin/com.example.registerlogin.ResetActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3319)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3415)
        at android.app.ActivityThread.access$1100(ActivityThread.java:229)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1821)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:148)
        at android.app.ActivityThread.main(ActivityThread.java:7325)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
     Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
        at com.example.registerlogin.ResetActivity.onCreate(ResetActivity.java:37)
        at android.app.Activity.performCreate(Activity.java:6904)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1136)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3266)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3415) 
        at android.app.ActivityThread.access$1100(ActivityThread.java:229) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1821) 
        at android.os.Handler.dispatchMessage(Handler.java:102) 
        at android.os.Looper.loop(Looper.java:148) 
        at android.app.ActivityThread.main(ActivityThread.java:7325) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120) 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/register"
    tools:context=".LoginActivity">


    <EditText
        android:id="@+id/login_email_input"
        android:layout_width="295dp"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginLeft="15dp"
        android:layout_marginTop="200dp"
        android:layout_marginRight="15dp"
        android:background="@drawable/input_design"
        android:hint="email id"
        android:inputType="textEmailAddress"
        android:padding="20dp"
        android:textColor="@color/colorPrimaryDark"
        android:textColorHint="@color/colorPrimaryDark"
        android:textSize="17sp"
        android:textStyle="bold" />


    <EditText
        android:id="@+id/login_password_input"
        android:layout_width="296dp"
        android:layout_height="wrap_content"
        android:layout_below="@+id/login_email_input"
        android:layout_centerHorizontal="true"
        android:layout_marginLeft="15dp"

        android:layout_marginTop="0dp"
        android:layout_marginRight="15dp"
        android:background="@drawable/input_design"
        android:hint="password"
        android:inputType="textPassword"
        android:padding="20dp"
        android:textColor="@color/colorPrimaryDark"
        android:textColorHint="@color/colorPrimaryDark"
        android:textSize="17sp"
        android:textStyle="bold" />

    <LinearLayout
        android:id="@+id/linear_layout_1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/login_password_input"
        android:orientation="horizontal"
        >

        <CheckBox
            android:id="@+id/remember_me_checkbox"
            style="@style/Widget.AppCompat.CompoundButton.CheckBox"
            android:layout_width="wrap_content"

            android:layout_height="wrap_content"
            android:layout_alignTop="@+id/linear_layout_1"
            android:layout_marginLeft="17dp"

            android:gravity="center_vertical"
            android:text="Remember me"
            android:textColor="@color/colorPrimaryDark"
            android:textSize="16sp"
            android:textStyle="bold" />
        <TextView
            android:id="@+id/forget_password_link"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Forgot Password?"
            android:textColor="@color/colorPrimaryDark"
            android:textSize="17sp"
            android:textStyle="bold"
            android:layout_marginLeft="90dp"
            />
    </LinearLayout>

    <Button
        android:id="@+id/login_btn"
        android:layout_width="380dp"
        android:layout_height="wrap_content"
        android:layout_below="@+id/linear_layout_1"
        android:layout_marginLeft="15dp"
        android:layout_marginTop="8dp"
        android:layout_marginRight="15dp"
        android:background="@drawable/buttons"
        android:padding="17dp"
        android:text="Login"
        android:textAllCaps="false"
        android:textColor="@android:color/white"
        android:textSize="15sp" />
    <TextView
        android:id="@+id/admin_link"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"

        android:layout_below="@+id/login_btn"
        android:text="I am Admin?"
        android:textColor="@color/colorPrimaryDark"
        android:textSize="17sp"
        android:textStyle="bold"
        android:layout_marginLeft="80dp"
        android:layout_marginEnd="23dp"

        />

    <TextView
        android:id="@+id/not_admin_link"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentStart="true"

        android:layout_below="@+id/login_btn"
        android:text="I am not Admin?"
        android:textColor="@color/colorPrimaryDark"
        android:textSize="17sp"
        android:textStyle="bold"
        android:layout_marginLeft="80dp"
        android:layout_marginEnd="25dp"
        android:visibility="invisible"
        />


</RelativeLayout>

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_reset);

        firebaseAuth=FirebaseAuth.getInstance();

        btnBack.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(ResetActivity.this,LoginActivity.class));

            }
        });

        btnResetPassword.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String userEmail=email.getText().toString().trim();

                if(TextUtils.isEmpty(userEmail)){
                    Toast.makeText(ResetActivity.this, "Enter your register email id", Toast.LENGTH_SHORT).show();
                    return;
                }

                progressBar.setVisibility(View.VISIBLE);

                firebaseAuth.sendPasswordResetEmail(userEmail).addOnCompleteListener(new OnCompleteListener<Void>() {
                    @Override
                    public void onComplete(@NonNull Task<Void> task) {
                        if (task.isSuccessful()) {
                            Toast.makeText(ResetActivity.this, "We have sent you instructions to reset your password!", Toast.LENGTH_SHORT).show();
                        } else {
                            Toast.makeText(ResetActivity.this, "Failed to send reset email!", Toast.LENGTH_SHORT).show();
                        }

                        progressBar.setVisibility(View.GONE);
                    }
                });
            }
        });
    }

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/register"
    tools:context=".LoginActivity">


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="30dp"
        android:gravity="center"
        android:orientation="vertical"
        android:padding="16dp">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            android:padding="10dp"
            android:text="@string/lbl_forgot_password"
            android:textColor="@color/colorPrimaryDark"
            android:textSize="20sp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="10dp"
            android:gravity="center_horizontal"
            android:padding="16dp"
            android:text="@string/forgot_password_msg"
            android:textColor="@color/colorPrimaryDark"
            android:textSize="14dp" />

        <EditText
            android:id="@+id/login_email_input"
            android:layout_width="295dp"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_marginLeft="15dp"
            android:layout_marginTop="20dp"
            android:layout_marginRight="15dp"
            android:background="@drawable/input_design"
            android:hint="email id"
            android:inputType="textEmailAddress"
            android:padding="20dp"
            android:textColor="@color/colorPrimaryDark"
            android:textColorHint="@color/colorPrimaryDark"
            android:textSize="17sp"
            android:textStyle="bold" />
        <Button
            android:id="@+id/btn_reset_password"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dip"
            android:background="@drawable/buttons"
            android:text="@string/btn_reset_password"
            android:textColor="@android:color/white" />

        <Button
            android:id="@+id/btn_back"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:background="@null"
            android:text="@string/btn_back"
            android:textColor="@color/colorPrimaryDark" />


    </LinearLayout>

    <ProgressBar
        android:id="@+id/progressBar"
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:layout_gravity="center|bottom"
        android:layout_marginBottom="20dp"
        android:visibility="gone" />

</RelativeLayout>

日志猫中的错误消息：

forgotPassword = (TextView) findViewById(R.id.forget_password_link);  
forgotPassword.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent i=new Intent(LoginActivity.this,ResetActivity.class);
                startActivity(i);
                Toast.makeText(LoginActivity.this,"Go to Reset password",Toast.LENGTH_LONG).show();
            }
        });

 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.registerlogin/com.example.registerlogin.ResetActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3319)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3415)
        at android.app.ActivityThread.access$1100(ActivityThread.java:229)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1821)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:148)
        at android.app.ActivityThread.main(ActivityThread.java:7325)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
     Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
        at com.example.registerlogin.ResetActivity.onCreate(ResetActivity.java:37)
        at android.app.Activity.performCreate(Activity.java:6904)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1136)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3266)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3415) 
        at android.app.ActivityThread.access$1100(ActivityThread.java:229) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1821) 
        at android.os.Handler.dispatchMessage(Handler.java:102) 
        at android.os.Looper.loop(Looper.java:148) 
        at android.app.ActivityThread.main(ActivityThread.java:7325) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120) 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/register"
    tools:context=".LoginActivity">


    <EditText
        android:id="@+id/login_email_input"
        android:layout_width="295dp"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginLeft="15dp"
        android:layout_marginTop="200dp"
        android:layout_marginRight="15dp"
        android:background="@drawable/input_design"
        android:hint="email id"
        android:inputType="textEmailAddress"
        android:padding="20dp"
        android:textColor="@color/colorPrimaryDark"
        android:textColorHint="@color/colorPrimaryDark"
        android:textSize="17sp"
        android:textStyle="bold" />


    <EditText
        android:id="@+id/login_password_input"
        android:layout_width="296dp"
        android:layout_height="wrap_content"
        android:layout_below="@+id/login_email_input"
        android:layout_centerHorizontal="true"
        android:layout_marginLeft="15dp"

        android:layout_marginTop="0dp"
        android:layout_marginRight="15dp"
        android:background="@drawable/input_design"
        android:hint="password"
        android:inputType="textPassword"
        android:padding="20dp"
        android:textColor="@color/colorPrimaryDark"
        android:textColorHint="@color/colorPrimaryDark"
        android:textSize="17sp"
        android:textStyle="bold" />

    <LinearLayout
        android:id="@+id/linear_layout_1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/login_password_input"
        android:orientation="horizontal"
        >

        <CheckBox
            android:id="@+id/remember_me_checkbox"
            style="@style/Widget.AppCompat.CompoundButton.CheckBox"
            android:layout_width="wrap_content"

            android:layout_height="wrap_content"
            android:layout_alignTop="@+id/linear_layout_1"
            android:layout_marginLeft="17dp"

            android:gravity="center_vertical"
            android:text="Remember me"
            android:textColor="@color/colorPrimaryDark"
            android:textSize="16sp"
            android:textStyle="bold" />
        <TextView
            android:id="@+id/forget_password_link"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Forgot Password?"
            android:textColor="@color/colorPrimaryDark"
            android:textSize="17sp"
            android:textStyle="bold"
            android:layout_marginLeft="90dp"
            />
    </LinearLayout>

    <Button
        android:id="@+id/login_btn"
        android:layout_width="380dp"
        android:layout_height="wrap_content"
        android:layout_below="@+id/linear_layout_1"
        android:layout_marginLeft="15dp"
        android:layout_marginTop="8dp"
        android:layout_marginRight="15dp"
        android:background="@drawable/buttons"
        android:padding="17dp"
        android:text="Login"
        android:textAllCaps="false"
        android:textColor="@android:color/white"
        android:textSize="15sp" />
    <TextView
        android:id="@+id/admin_link"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"

        android:layout_below="@+id/login_btn"
        android:text="I am Admin?"
        android:textColor="@color/colorPrimaryDark"
        android:textSize="17sp"
        android:textStyle="bold"
        android:layout_marginLeft="80dp"
        android:layout_marginEnd="23dp"

        />

    <TextView
        android:id="@+id/not_admin_link"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentStart="true"

        android:layout_below="@+id/login_btn"
        android:text="I am not Admin?"
        android:textColor="@color/colorPrimaryDark"
        android:textSize="17sp"
        android:textStyle="bold"
        android:layout_marginLeft="80dp"
        android:layout_marginEnd="25dp"
        android:visibility="invisible"
        />


</RelativeLayout>

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_reset);

        firebaseAuth=FirebaseAuth.getInstance();

        btnBack.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(ResetActivity.this,LoginActivity.class));

            }
        });

        btnResetPassword.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String userEmail=email.getText().toString().trim();

                if(TextUtils.isEmpty(userEmail)){
                    Toast.makeText(ResetActivity.this, "Enter your register email id", Toast.LENGTH_SHORT).show();
                    return;
                }

                progressBar.setVisibility(View.VISIBLE);

                firebaseAuth.sendPasswordResetEmail(userEmail).addOnCompleteListener(new OnCompleteListener<Void>() {
                    @Override
                    public void onComplete(@NonNull Task<Void> task) {
                        if (task.isSuccessful()) {
                            Toast.makeText(ResetActivity.this, "We have sent you instructions to reset your password!", Toast.LENGTH_SHORT).show();
                        } else {
                            Toast.makeText(ResetActivity.this, "Failed to send reset email!", Toast.LENGTH_SHORT).show();
                        }

                        progressBar.setVisibility(View.GONE);
                    }
                });
            }
        });
    }

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/register"
    tools:context=".LoginActivity">


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="30dp"
        android:gravity="center"
        android:orientation="vertical"
        android:padding="16dp">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            android:padding="10dp"
            android:text="@string/lbl_forgot_password"
            android:textColor="@color/colorPrimaryDark"
            android:textSize="20sp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="10dp"
            android:gravity="center_horizontal"
            android:padding="16dp"
            android:text="@string/forgot_password_msg"
            android:textColor="@color/colorPrimaryDark"
            android:textSize="14dp" />

        <EditText
            android:id="@+id/login_email_input"
            android:layout_width="295dp"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_marginLeft="15dp"
            android:layout_marginTop="20dp"
            android:layout_marginRight="15dp"
            android:background="@drawable/input_design"
            android:hint="email id"
            android:inputType="textEmailAddress"
            android:padding="20dp"
            android:textColor="@color/colorPrimaryDark"
            android:textColorHint="@color/colorPrimaryDark"
            android:textSize="17sp"
            android:textStyle="bold" />
        <Button
            android:id="@+id/btn_reset_password"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dip"
            android:background="@drawable/buttons"
            android:text="@string/btn_reset_password"
            android:textColor="@android:color/white" />

        <Button
            android:id="@+id/btn_back"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:background="@null"
            android:text="@string/btn_back"
            android:textColor="@color/colorPrimaryDark" />


    </LinearLayout>

    <ProgressBar
        android:id="@+id/progressBar"
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:layout_gravity="center|bottom"
        android:layout_marginBottom="20dp"
        android:visibility="gone" />

</RelativeLayout>

LoginActivity XML文件：

forgotPassword = (TextView) findViewById(R.id.forget_password_link);  
forgotPassword.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent i=new Intent(LoginActivity.this,ResetActivity.class);
                startActivity(i);
                Toast.makeText(LoginActivity.this,"Go to Reset password",Toast.LENGTH_LONG).show();
            }
        });

 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.registerlogin/com.example.registerlogin.ResetActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3319)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3415)
        at android.app.ActivityThread.access$1100(ActivityThread.java:229)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1821)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:148)
        at android.app.ActivityThread.main(ActivityThread.java:7325)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
     Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
        at com.example.registerlogin.ResetActivity.onCreate(ResetActivity.java:37)
        at android.app.Activity.performCreate(Activity.java:6904)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1136)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3266)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3415) 
        at android.app.ActivityThread.access$1100(ActivityThread.java:229) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1821) 
        at android.os.Handler.dispatchMessage(Handler.java:102) 
        at android.os.Looper.loop(Looper.java:148) 
        at android.app.ActivityThread.main(ActivityThread.java:7325) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120) 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/register"
    tools:context=".LoginActivity">


    <EditText
        android:id="@+id/login_email_input"
        android:layout_width="295dp"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginLeft="15dp"
        android:layout_marginTop="200dp"
        android:layout_marginRight="15dp"
        android:background="@drawable/input_design"
        android:hint="email id"
        android:inputType="textEmailAddress"
        android:padding="20dp"
        android:textColor="@color/colorPrimaryDark"
        android:textColorHint="@color/colorPrimaryDark"
        android:textSize="17sp"
        android:textStyle="bold" />


    <EditText
        android:id="@+id/login_password_input"
        android:layout_width="296dp"
        android:layout_height="wrap_content"
        android:layout_below="@+id/login_email_input"
        android:layout_centerHorizontal="true"
        android:layout_marginLeft="15dp"

        android:layout_marginTop="0dp"
        android:layout_marginRight="15dp"
        android:background="@drawable/input_design"
        android:hint="password"
        android:inputType="textPassword"
        android:padding="20dp"
        android:textColor="@color/colorPrimaryDark"
        android:textColorHint="@color/colorPrimaryDark"
        android:textSize="17sp"
        android:textStyle="bold" />

    <LinearLayout
        android:id="@+id/linear_layout_1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/login_password_input"
        android:orientation="horizontal"
        >

        <CheckBox
            android:id="@+id/remember_me_checkbox"
            style="@style/Widget.AppCompat.CompoundButton.CheckBox"
            android:layout_width="wrap_content"

            android:layout_height="wrap_content"
            android:layout_alignTop="@+id/linear_layout_1"
            android:layout_marginLeft="17dp"

            android:gravity="center_vertical"
            android:text="Remember me"
            android:textColor="@color/colorPrimaryDark"
            android:textSize="16sp"
            android:textStyle="bold" />
        <TextView
            android:id="@+id/forget_password_link"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Forgot Password?"
            android:textColor="@color/colorPrimaryDark"
            android:textSize="17sp"
            android:textStyle="bold"
            android:layout_marginLeft="90dp"
            />
    </LinearLayout>

    <Button
        android:id="@+id/login_btn"
        android:layout_width="380dp"
        android:layout_height="wrap_content"
        android:layout_below="@+id/linear_layout_1"
        android:layout_marginLeft="15dp"
        android:layout_marginTop="8dp"
        android:layout_marginRight="15dp"
        android:background="@drawable/buttons"
        android:padding="17dp"
        android:text="Login"
        android:textAllCaps="false"
        android:textColor="@android:color/white"
        android:textSize="15sp" />
    <TextView
        android:id="@+id/admin_link"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"

        android:layout_below="@+id/login_btn"
        android:text="I am Admin?"
        android:textColor="@color/colorPrimaryDark"
        android:textSize="17sp"
        android:textStyle="bold"
        android:layout_marginLeft="80dp"
        android:layout_marginEnd="23dp"

        />

    <TextView
        android:id="@+id/not_admin_link"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentStart="true"

        android:layout_below="@+id/login_btn"
        android:text="I am not Admin?"
        android:textColor="@color/colorPrimaryDark"
        android:textSize="17sp"
        android:textStyle="bold"
        android:layout_marginLeft="80dp"
        android:layout_marginEnd="25dp"
        android:visibility="invisible"
        />


</RelativeLayout>

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_reset);

        firebaseAuth=FirebaseAuth.getInstance();

        btnBack.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(ResetActivity.this,LoginActivity.class));

            }
        });

        btnResetPassword.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String userEmail=email.getText().toString().trim();

                if(TextUtils.isEmpty(userEmail)){
                    Toast.makeText(ResetActivity.this, "Enter your register email id", Toast.LENGTH_SHORT).show();
                    return;
                }

                progressBar.setVisibility(View.VISIBLE);

                firebaseAuth.sendPasswordResetEmail(userEmail).addOnCompleteListener(new OnCompleteListener<Void>() {
                    @Override
                    public void onComplete(@NonNull Task<Void> task) {
                        if (task.isSuccessful()) {
                            Toast.makeText(ResetActivity.this, "We have sent you instructions to reset your password!", Toast.LENGTH_SHORT).show();
                        } else {
                            Toast.makeText(ResetActivity.this, "Failed to send reset email!", Toast.LENGTH_SHORT).show();
                        }

                        progressBar.setVisibility(View.GONE);
                    }
                });
            }
        });
    }

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/register"
    tools:context=".LoginActivity">


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="30dp"
        android:gravity="center"
        android:orientation="vertical"
        android:padding="16dp">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            android:padding="10dp"
            android:text="@string/lbl_forgot_password"
            android:textColor="@color/colorPrimaryDark"
            android:textSize="20sp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="10dp"
            android:gravity="center_horizontal"
            android:padding="16dp"
            android:text="@string/forgot_password_msg"
            android:textColor="@color/colorPrimaryDark"
            android:textSize="14dp" />

        <EditText
            android:id="@+id/login_email_input"
            android:layout_width="295dp"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_marginLeft="15dp"
            android:layout_marginTop="20dp"
            android:layout_marginRight="15dp"
            android:background="@drawable/input_design"
            android:hint="email id"
            android:inputType="textEmailAddress"
            android:padding="20dp"
            android:textColor="@color/colorPrimaryDark"
            android:textColorHint="@color/colorPrimaryDark"
            android:textSize="17sp"
            android:textStyle="bold" />
        <Button
            android:id="@+id/btn_reset_password"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dip"
            android:background="@drawable/buttons"
            android:text="@string/btn_reset_password"
            android:textColor="@android:color/white" />

        <Button
            android:id="@+id/btn_back"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:background="@null"
            android:text="@string/btn_back"
            android:textColor="@color/colorPrimaryDark" />


    </LinearLayout>

    <ProgressBar
        android:id="@+id/progressBar"
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:layout_gravity="center|bottom"
        android:layout_marginBottom="20dp"
        android:visibility="gone" />

</RelativeLayout>

重置活动OnCreate（）：

forgotPassword = (TextView) findViewById(R.id.forget_password_link);  
forgotPassword.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent i=new Intent(LoginActivity.this,ResetActivity.class);
                startActivity(i);
                Toast.makeText(LoginActivity.this,"Go to Reset password",Toast.LENGTH_LONG).show();
            }
        });

 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.registerlogin/com.example.registerlogin.ResetActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3319)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3415)
        at android.app.ActivityThread.access$1100(ActivityThread.java:229)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1821)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:148)
        at android.app.ActivityThread.main(ActivityThread.java:7325)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
     Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
        at com.example.registerlogin.ResetActivity.onCreate(ResetActivity.java:37)
        at android.app.Activity.performCreate(Activity.java:6904)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1136)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3266)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3415) 
        at android.app.ActivityThread.access$1100(ActivityThread.java:229) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1821) 
        at android.os.Handler.dispatchMessage(Handler.java:102) 
        at android.os.Looper.loop(Looper.java:148) 
        at android.app.ActivityThread.main(ActivityThread.java:7325) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120) 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/register"
    tools:context=".LoginActivity">


    <EditText
        android:id="@+id/login_email_input"
        android:layout_width="295dp"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginLeft="15dp"
        android:layout_marginTop="200dp"
        android:layout_marginRight="15dp"
        android:background="@drawable/input_design"
        android:hint="email id"
        android:inputType="textEmailAddress"
        android:padding="20dp"
        android:textColor="@color/colorPrimaryDark"
        android:textColorHint="@color/colorPrimaryDark"
        android:textSize="17sp"
        android:textStyle="bold" />


    <EditText
        android:id="@+id/login_password_input"
        android:layout_width="296dp"
        android:layout_height="wrap_content"
        android:layout_below="@+id/login_email_input"
        android:layout_centerHorizontal="true"
        android:layout_marginLeft="15dp"

        android:layout_marginTop="0dp"
        android:layout_marginRight="15dp"
        android:background="@drawable/input_design"
        android:hint="password"
        android:inputType="textPassword"
        android:padding="20dp"
        android:textColor="@color/colorPrimaryDark"
        android:textColorHint="@color/colorPrimaryDark"
        android:textSize="17sp"
        android:textStyle="bold" />

    <LinearLayout
        android:id="@+id/linear_layout_1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/login_password_input"
        android:orientation="horizontal"
        >

        <CheckBox
            android:id="@+id/remember_me_checkbox"
            style="@style/Widget.AppCompat.CompoundButton.CheckBox"
            android:layout_width="wrap_content"

            android:layout_height="wrap_content"
            android:layout_alignTop="@+id/linear_layout_1"
            android:layout_marginLeft="17dp"

            android:gravity="center_vertical"
            android:text="Remember me"
            android:textColor="@color/colorPrimaryDark"
            android:textSize="16sp"
            android:textStyle="bold" />
        <TextView
            android:id="@+id/forget_password_link"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Forgot Password?"
            android:textColor="@color/colorPrimaryDark"
            android:textSize="17sp"
            android:textStyle="bold"
            android:layout_marginLeft="90dp"
            />
    </LinearLayout>

    <Button
        android:id="@+id/login_btn"
        android:layout_width="380dp"
        android:layout_height="wrap_content"
        android:layout_below="@+id/linear_layout_1"
        android:layout_marginLeft="15dp"
        android:layout_marginTop="8dp"
        android:layout_marginRight="15dp"
        android:background="@drawable/buttons"
        android:padding="17dp"
        android:text="Login"
        android:textAllCaps="false"
        android:textColor="@android:color/white"
        android:textSize="15sp" />
    <TextView
        android:id="@+id/admin_link"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"

        android:layout_below="@+id/login_btn"
        android:text="I am Admin?"
        android:textColor="@color/colorPrimaryDark"
        android:textSize="17sp"
        android:textStyle="bold"
        android:layout_marginLeft="80dp"
        android:layout_marginEnd="23dp"

        />

    <TextView
        android:id="@+id/not_admin_link"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentStart="true"

        android:layout_below="@+id/login_btn"
        android:text="I am not Admin?"
        android:textColor="@color/colorPrimaryDark"
        android:textSize="17sp"
        android:textStyle="bold"
        android:layout_marginLeft="80dp"
        android:layout_marginEnd="25dp"
        android:visibility="invisible"
        />


</RelativeLayout>

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_reset);

        firebaseAuth=FirebaseAuth.getInstance();

        btnBack.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(ResetActivity.this,LoginActivity.class));

            }
        });

        btnResetPassword.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String userEmail=email.getText().toString().trim();

                if(TextUtils.isEmpty(userEmail)){
                    Toast.makeText(ResetActivity.this, "Enter your register email id", Toast.LENGTH_SHORT).show();
                    return;
                }

                progressBar.setVisibility(View.VISIBLE);

                firebaseAuth.sendPasswordResetEmail(userEmail).addOnCompleteListener(new OnCompleteListener<Void>() {
                    @Override
                    public void onComplete(@NonNull Task<Void> task) {
                        if (task.isSuccessful()) {
                            Toast.makeText(ResetActivity.this, "We have sent you instructions to reset your password!", Toast.LENGTH_SHORT).show();
                        } else {
                            Toast.makeText(ResetActivity.this, "Failed to send reset email!", Toast.LENGTH_SHORT).show();
                        }

                        progressBar.setVisibility(View.GONE);
                    }
                });
            }
        });
    }

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/register"
    tools:context=".LoginActivity">


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="30dp"
        android:gravity="center"
        android:orientation="vertical"
        android:padding="16dp">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            android:padding="10dp"
            android:text="@string/lbl_forgot_password"
            android:textColor="@color/colorPrimaryDark"
            android:textSize="20sp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="10dp"
            android:gravity="center_horizontal"
            android:padding="16dp"
            android:text="@string/forgot_password_msg"
            android:textColor="@color/colorPrimaryDark"
            android:textSize="14dp" />

        <EditText
            android:id="@+id/login_email_input"
            android:layout_width="295dp"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_marginLeft="15dp"
            android:layout_marginTop="20dp"
            android:layout_marginRight="15dp"
            android:background="@drawable/input_design"
            android:hint="email id"
            android:inputType="textEmailAddress"
            android:padding="20dp"
            android:textColor="@color/colorPrimaryDark"
            android:textColorHint="@color/colorPrimaryDark"
            android:textSize="17sp"
            android:textStyle="bold" />
        <Button
            android:id="@+id/btn_reset_password"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dip"
            android:background="@drawable/buttons"
            android:text="@string/btn_reset_password"
            android:textColor="@android:color/white" />

        <Button
            android:id="@+id/btn_back"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:background="@null"
            android:text="@string/btn_back"
            android:textColor="@color/colorPrimaryDark" />


    </LinearLayout>

    <ProgressBar
        android:id="@+id/progressBar"
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:layout_gravity="center|bottom"
        android:layout_marginBottom="20dp"
        android:visibility="gone" />

</RelativeLayout>

创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_reset）；
firebaseAuth=firebaseAuth.getInstance（）；
btnBack.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图v）{
startActivity（新意图（ResetActivity.this，LoginActivity.class））；
}
});
btnResetPassword.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图v）{
字符串userEmail=email.getText（）.toString（）.trim（）；
if（TextUtils.isEmpty（userEmail））{
Toast.makeText（ResetActivity.this，“输入您的注册电子邮件id”，Toast.LENGTH_SHORT.show（）；
返回；
}
progressBar.setVisibility（View.VISIBLE）；
firebaseAuth.sendPasswordResetEmail（userEmail）.addOnCompleteListener（新OnCompleteListener（）{
@凌驾
未完成的公共void（@NonNull任务）{
if（task.issusccessful（））{
Toast.makeText（ResetActivity.this，“我们已向您发送重置密码的说明！”，Toast.LENGTH\u SHORT.show（）；
}否则{
Toast.makeText（ResetActivity.this，“发送重置电子邮件失败！”，Toast.LENGTH_SHORT.show（）；
}
progressBar.setVisibility（View.GONE）；
}
});
}
});
}

活动\u reset.xml：

forgotPassword = (TextView) findViewById(R.id.forget_password_link);  
forgotPassword.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent i=new Intent(LoginActivity.this,ResetActivity.class);
                startActivity(i);
                Toast.makeText(LoginActivity.this,"Go to Reset password",Toast.LENGTH_LONG).show();
            }
        });

 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.registerlogin/com.example.registerlogin.ResetActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3319)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3415)
        at android.app.ActivityThread.access$1100(ActivityThread.java:229)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1821)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:148)
        at android.app.ActivityThread.main(ActivityThread.java:7325)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
     Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
        at com.example.registerlogin.ResetActivity.onCreate(ResetActivity.java:37)
        at android.app.Activity.performCreate(Activity.java:6904)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1136)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3266)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3415) 
        at android.app.ActivityThread.access$1100(ActivityThread.java:229) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1821) 
        at android.os.Handler.dispatchMessage(Handler.java:102) 
        at android.os.Looper.loop(Looper.java:148) 
        at android.app.ActivityThread.main(ActivityThread.java:7325) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120) 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/register"
    tools:context=".LoginActivity">


    <EditText
        android:id="@+id/login_email_input"
        android:layout_width="295dp"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginLeft="15dp"
        android:layout_marginTop="200dp"
        android:layout_marginRight="15dp"
        android:background="@drawable/input_design"
        android:hint="email id"
        android:inputType="textEmailAddress"
        android:padding="20dp"
        android:textColor="@color/colorPrimaryDark"
        android:textColorHint="@color/colorPrimaryDark"
        android:textSize="17sp"
        android:textStyle="bold" />


    <EditText
        android:id="@+id/login_password_input"
        android:layout_width="296dp"
        android:layout_height="wrap_content"
        android:layout_below="@+id/login_email_input"
        android:layout_centerHorizontal="true"
        android:layout_marginLeft="15dp"

        android:layout_marginTop="0dp"
        android:layout_marginRight="15dp"
        android:background="@drawable/input_design"
        android:hint="password"
        android:inputType="textPassword"
        android:padding="20dp"
        android:textColor="@color/colorPrimaryDark"
        android:textColorHint="@color/colorPrimaryDark"
        android:textSize="17sp"
        android:textStyle="bold" />

    <LinearLayout
        android:id="@+id/linear_layout_1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/login_password_input"
        android:orientation="horizontal"
        >

        <CheckBox
            android:id="@+id/remember_me_checkbox"
            style="@style/Widget.AppCompat.CompoundButton.CheckBox"
            android:layout_width="wrap_content"

            android:layout_height="wrap_content"
            android:layout_alignTop="@+id/linear_layout_1"
            android:layout_marginLeft="17dp"

            android:gravity="center_vertical"
            android:text="Remember me"
            android:textColor="@color/colorPrimaryDark"
            android:textSize="16sp"
            android:textStyle="bold" />
        <TextView
            android:id="@+id/forget_password_link"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Forgot Password?"
            android:textColor="@color/colorPrimaryDark"
            android:textSize="17sp"
            android:textStyle="bold"
            android:layout_marginLeft="90dp"
            />
    </LinearLayout>

    <Button
        android:id="@+id/login_btn"
        android:layout_width="380dp"
        android:layout_height="wrap_content"
        android:layout_below="@+id/linear_layout_1"
        android:layout_marginLeft="15dp"
        android:layout_marginTop="8dp"
        android:layout_marginRight="15dp"
        android:background="@drawable/buttons"
        android:padding="17dp"
        android:text="Login"
        android:textAllCaps="false"
        android:textColor="@android:color/white"
        android:textSize="15sp" />
    <TextView
        android:id="@+id/admin_link"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"

        android:layout_below="@+id/login_btn"
        android:text="I am Admin?"
        android:textColor="@color/colorPrimaryDark"
        android:textSize="17sp"
        android:textStyle="bold"
        android:layout_marginLeft="80dp"
        android:layout_marginEnd="23dp"

        />

    <TextView
        android:id="@+id/not_admin_link"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentStart="true"

        android:layout_below="@+id/login_btn"
        android:text="I am not Admin?"
        android:textColor="@color/colorPrimaryDark"
        android:textSize="17sp"
        android:textStyle="bold"
        android:layout_marginLeft="80dp"
        android:layout_marginEnd="25dp"
        android:visibility="invisible"
        />


</RelativeLayout>

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_reset);

        firebaseAuth=FirebaseAuth.getInstance();

        btnBack.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(ResetActivity.this,LoginActivity.class));

            }
        });

        btnResetPassword.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String userEmail=email.getText().toString().trim();

                if(TextUtils.isEmpty(userEmail)){
                    Toast.makeText(ResetActivity.this, "Enter your register email id", Toast.LENGTH_SHORT).show();
                    return;
                }

                progressBar.setVisibility(View.VISIBLE);

                firebaseAuth.sendPasswordResetEmail(userEmail).addOnCompleteListener(new OnCompleteListener<Void>() {
                    @Override
                    public void onComplete(@NonNull Task<Void> task) {
                        if (task.isSuccessful()) {
                            Toast.makeText(ResetActivity.this, "We have sent you instructions to reset your password!", Toast.LENGTH_SHORT).show();
                        } else {
                            Toast.makeText(ResetActivity.this, "Failed to send reset email!", Toast.LENGTH_SHORT).show();
                        }

                        progressBar.setVisibility(View.GONE);
                    }
                });
            }
        });
    }

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/register"
    tools:context=".LoginActivity">


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="30dp"
        android:gravity="center"
        android:orientation="vertical"
        android:padding="16dp">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            android:padding="10dp"
            android:text="@string/lbl_forgot_password"
            android:textColor="@color/colorPrimaryDark"
            android:textSize="20sp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="10dp"
            android:gravity="center_horizontal"
            android:padding="16dp"
            android:text="@string/forgot_password_msg"
            android:textColor="@color/colorPrimaryDark"
            android:textSize="14dp" />

        <EditText
            android:id="@+id/login_email_input"
            android:layout_width="295dp"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_marginLeft="15dp"
            android:layout_marginTop="20dp"
            android:layout_marginRight="15dp"
            android:background="@drawable/input_design"
            android:hint="email id"
            android:inputType="textEmailAddress"
            android:padding="20dp"
            android:textColor="@color/colorPrimaryDark"
            android:textColorHint="@color/colorPrimaryDark"
            android:textSize="17sp"
            android:textStyle="bold" />
        <Button
            android:id="@+id/btn_reset_password"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dip"
            android:background="@drawable/buttons"
            android:text="@string/btn_reset_password"
            android:textColor="@android:color/white" />

        <Button
            android:id="@+id/btn_back"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:background="@null"
            android:text="@string/btn_back"
            android:textColor="@color/colorPrimaryDark" />


    </LinearLayout>

    <ProgressBar
        android:id="@+id/progressBar"
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:layout_gravity="center|bottom"
        android:layout_marginBottom="20dp"
        android:visibility="gone" />

</RelativeLayout>

---

但该应用程序停止工作。你能告诉我为什么会这样吗？这个问题的解决方案是什么？

看看stacktrace，它指向

com.example.registerlogin.ResetActivity.onCreate

，因此发布的代码运行良好，并打开了

ResetActivity

，其中有一些错误（确切地说是第37行）

由于问题编辑：

---

您正在尝试

btnBack.setOnClickListener

，但上面没有

findViewById

，因此此

视图

为

null

（也

btnResetPassword

）

这可能是由于几个原因造成的。有时它也可能是ResetActivity.class中的异常。因此，请使用logcat错误消息更新您的问题。添加logcat和loginActivity xml我还添加了logcat消息和xml代码。您能否共享ResetActivity onCreate方法和ResetActivity xml文件？