Android 无法在片段容器中执行活动的方法

我是Android新手，对我难看的英语感到抱歉

我有2个片段，其中的主要任务是：

ProfileFragment.java

private void initUI(View parent) {

    /**
     * referencing of  fragment_profile
     */
    fragmentImageProfile = (CircleImageView) parent.findViewById(R.id.fragment_profile_picture);
    fragmentName = (EditText) parent.findViewById(R.id.fragment_profile_editText_name);
    fragmentFamily = (EditText) parent.findViewById(R.id.fragment_profile_editText_family);
    fragmentPhoneNumber = (EditText) parent.findViewById(R.id.fragment_profile_editText_phone);

    /**
     * get contact by invoke from CallBack on ProfileActivity
     */
    Contact contact = profileCallBack.getContact();
    fragmentName.setText(contact.getName());
    fragmentFamily.setText(contact.getFamily());
    fragmentPhoneNumber.setText(contact.getPhonNumber());

    Log.i("==>", "initUI: "+ contact.getName());

}

 public void updateContact() {
    int id = contact.get_id();
    String name = fragmentEditEditTextName.getText().toString();
    Log.i("==>", "Name Update: " + name);
    String family = fragmentEditEditTextFamily.getText().toString();
    String phoneNumber = fragmentEditEditTextPhoneNumber.getText().toString();
    int rowUpdate = App.getInstanceImplementation().updateContact(
            new Contact(id, name, family, phoneNumber, "image"));
    Log.i("==>", "btnUpdateContact: " + rowUpdate);

}

和它的Lauout

   <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Name: "
            android:textSize="20dp" />

        <EditText
            android:id="@+id/fragment_profile_editText_name"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:cursorVisible="true"
            android:enabled="false"
            android:focusable="false" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Family: "
            android:textSize="20dp" />

        <EditText
            android:id="@+id/fragment_profile_editText_family"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:enabled="false"
            android:focusable="false"
            android:inputType="none" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Phone: "
            android:textSize="20dp" />

        <EditText
            android:id="@+id/fragment_profile_editText_phone"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:enabled="false"
            android:focusable="false"
            android:inputType="none" />

    </LinearLayout>

这个布局呢

  <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Name: "
            android:textSize="20dp" />

        <EditText
            android:id="@+id/fragment_edit_editText_name"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:cursorVisible="true"
            android:inputType="text"/>

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Family: "
            android:textSize="20dp" />

        <EditText
            android:id="@+id/fragment_edit_editText_family"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:inputType="text" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Phone: "
            android:textSize="20dp" />

        <EditText
            android:id="@+id/fragment_edit_editText_phone"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:inputType="phone" />

    </LinearLayout>


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <Button
            android:id="@+id/fragment_edit_btn_save"
            style="@style/Widget.AppCompat.Button.Borderless.Colored"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="24dp"
            android:layout_marginRight="2dp"
            android:onClick="btnUpdateContact"
            android:layout_weight="1"
            android:background="#8d860000"
            android:padding="12dp"
            android:text="Update" />

        <Button
            android:id="@+id/fragment_edit_btn_exit"
            style="@style/Widget.AppCompat.Button.Borderless.Colored"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="24dp"
            android:onClick="btnExitContact"
            android:layout_weight="1"
            android:background="#8d860000"
            android:padding="12dp"
            android:text="Exit" />
    </LinearLayout>

问题在于：

private ProfileFragment getProfileFragment() {
if (profileFragment == null) {
    profileFragment = new ProfileFragment(); //you need to change this as this will only create an object and doesn't initialize any view;
}
Log.i("==>", "getProfileFragment:" + profileFragment.getId());
return profileFragment;
}

现在如果调用updateCon‌​tact（）方法，当您试图访问FragmentEditTextName文本视图时，它将在从上述方法接收的对象上引发异常

更改getProfileFragment（）中的以下行：

致：

---

原因：com.example.sayres.myapplication7.mvp.view.profile.EditProfileFragment.updateContact上的java.lang.NullPointerException（EditProfileFragment.java:70）在com.example.sayres.myapplication7.mvp.view.profile.ProfileActivity.btnuupdateContact（ProfileActivity.java:97）中，我认为您需要更改getEditProfileFragment（）；实施不要创建片段的新实例，而是尝试从为view pagerok创建的列表中获取它，但不能为null，因为它是在此方法中初始化的

private EditProfileFragment getEditProfileFragment（）{if（EditProfileFragment==null）{EditProfileFragment=new EditProfileFragment（）；}

我在onResume方法上运行了什么样的更改？@sanjeetkumarsingh它肯定不会为空，但使用new关键字创建新的片段实例并不意味着该片段的所有视图都已创建。在updateCon中‌​EditProfileFragment中的tact（）方法您试图访问FragmentEditTextName，这会导致错误。

02-04 01:23:40.953 4545-4545/com.example.sayres.myapplication7 E/AndroidRuntime: FATAL EXCEPTION: main
                                                                             Process: com.example.sayres.myapplication7, PID: 4545
                                                                             java.lang.IllegalStateException: Could not execute method of the activity
                                                                                 at android.view.View$1.onClick(View.java:3823)
                                                                                 at android.view.View.performClick(View.java:4438)
                                                                                 at android.view.View$PerformClick.run(View.java:18422)
                                                                                 at android.os.Handler.handleCallback(Handler.java:733)
                                                                                 at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                                 at android.os.Looper.loop(Looper.java:136)
                                                                                 at android.app.ActivityThread.main(ActivityThread.java:5001)
                                                                                 at java.lang.reflect.Method.invokeNative(Native Method)
                                                                                 at java.lang.reflect.Method.invoke(Method.java:515)
                                                                                 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
                                                                                 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
                                                                                 at dalvik.system.NativeStart.main(Native Method)
                                                                              Caused by: java.lang.reflect.InvocationTargetException
                                                                                 at java.lang.reflect.Method.invokeNative(Native Method)
                                                                                 at java.lang.reflect.Method.invoke(Method.java:515)
                                                                                 at android.view.View$1.onClick(View.java:3818)
                                                                                 at android.view.View.performClick(View.java:4438) 
                                                                                 at android.view.View$PerformClick.run(View.java:18422) 
                                                                                 at android.os.Handler.handleCallback(Handler.java:733) 
                                                                                 at android.os.Handler.dispatchMessage(Handler.java:95) 
                                                                                 at android.os.Looper.loop(Looper.java:136) 
                                                                                 at android.app.ActivityThread.main(ActivityThread.java:5001) 
                                                                                 at java.lang.reflect.Method.invokeNative(Native Method) 
                                                                                 at java.lang.reflect.Method.invoke(Method.java:515) 
                                                                                 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785) 
                                                                                 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601) 
                                                                                 at dalvik.system.NativeStart.main(Native Method) 
                                                                              Caused by: java.lang.NullPointerException
                                                                                 at com.example.sayres.myapplication7.mvp.view.profile.EditProfileFragment.updateContact(EditProfileFragment.java:70)
                                                                                 at com.example.sayres.myapplication7.mvp.view.profile.ProfileActivity.btnUpdateContact(ProfileActivity.java:97)
                                                                                 at java.lang.reflect.Method.invokeNative(Native Method) 
                                                                                 at java.lang.reflect.Method.invoke(Method.java:515) 
                                                                                 at android.view.View$1.onClick(View.java:3818) 
                                                                                 at android.view.View.performClick(View.java:4438) 
                                                                                 at android.view.View$PerformClick.run(View.java:18422) 
                                                                                 at android.os.Handler.handleCallback(Handler.java:733) 
                                                                                 at android.os.Handler.dispatchMessage(Handler.java:95) 
                                                                                 at android.os.Looper.loop(Looper.java:136) 
                                                                                 at android.app.ActivityThread.main(ActivityThread.java:5001) 
                                                                                 at java.lang.reflect.Method.invokeNative(Native Method) 
                                                                                 at java.lang.reflect.Method.invoke(Method.java:515) 
                                                                                 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785) 
                                                                                 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601) 
                                                                                 at dalvik.system.NativeStart.main(Native Method) 

private ProfileFragment getProfileFragment() {
if (profileFragment == null) {
    profileFragment = new ProfileFragment(); //you need to change this as this will only create an object and doesn't initialize any view;
}
Log.i("==>", "getProfileFragment:" + profileFragment.getId());
return profileFragment;
}

profileFragment = new ProfileFragment();

profileFragment = fragments.get(1);