Java 我们可以根据某些条件进行两次启动活动并启动一次吗?

Java 我们可以根据某些条件进行两次启动活动并启动一次吗?,java,android,android-intent,Java,Android,Android Intent,我的launcher活动是loginActivity,我希望当用户选择一所大学并第二次打开应用程序时,他应该移动到另一个活动TestYip(而不是登录活动)。也就是说,一旦用户登录,启动程序的活动就会改变。为此,我在“选择拼贴”活动中做了一个函数,称为“后勤活动”。 但是它不起作用。。代码如下所示: 选择拼贴 package notes.test.firebase; import java.util.ArrayList; import java.util

我的launcher活动是loginActivity,我希望当用户选择一所大学并第二次打开应用程序时,他应该移动到另一个活动TestYip(而不是登录活动)。也就是说,一旦用户登录,启动程序的活动就会改变。为此,我在“选择拼贴”活动中做了一个函数,称为“后勤活动”。 但是它不起作用。。代码如下所示:

  • 选择拼贴

                package notes.test.firebase;
    
        import java.util.ArrayList;
        import java.util.HashMap;
    
        import android.content.Intent;
        import android.content.SharedPreferences;
        import android.os.Build;
        import android.os.Bundle;
        import android.preference.PreferenceManager;
        import android.support.v7.app.AppCompatActivity;
        import android.text.Editable;
        import android.text.TextWatcher;
        import android.view.View;
        import android.view.Window;
        import android.view.WindowManager;
        import android.widget.AdapterView;
        import android.widget.ArrayAdapter;
        import android.widget.EditText;
        import android.widget.ListView;
        import android.widget.TextView;
    
    
        public class Select_Collage extends AppCompatActivity {
    
            // List view
            public ListView lv;
            public TextView tv;
            public String str;
    
    
            // Listview Adapter
            ArrayAdapter<String> adapter;
    
            // Search EditText
            EditText inputSearch;
    
           final String products[] = {"Jaypee university Guna", "Delhi university", "Graphics era", "UPES",
                    "Amity university", "Saradha university",
                    "ITM gwalior", "RKDF university", "Indraprast university", "IIT delhi"};
    
    
            // ArrayList for Listview
            ArrayList<HashMap<String, String>> productList;
    
            @Override
            public void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.collage);
                if (Build.VERSION.SDK_INT >= 21) {
                    Window window = getWindow();
                    window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
                    window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
                    window.setStatusBarColor(getResources().getColor(R.color.colorPrimaryDark));
                }
                // Listview Data
               /* final String products[] = {"Jaypee university Guna", "Delhi university", "Graphics era", "UPES",
                        "Amity university", "Saradha university",
                        "ITM gwalior", "RKDF university", "Indraprast university", "IIT delhi"};
    
        */
                lv = (ListView) findViewById(R.id.list_view);
    
    
                inputSearch = (EditText) findViewById(R.id.inputSearch);
    
                // Adding items to listview
                adapter = new ArrayAdapter<String>(this, R.layout.college_selection_text_view, R.id.product_name, products);
                lv.setAdapter(adapter);
    
                lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                    @Override
                    public void onItemClick(AdapterView<?> arg0, View arg1, int position,
                                            long arg3){
    
                        tv = (TextView) arg1.findViewById(R.id.product_name);
    
                        str = tv.getText().toString().trim();
    
                        if (str.equals(products[0]))
    
                        {
                            Intent int0 = new Intent(Select_Collage.this, TestYip.class);
                            startActivity(int0);
                        }
    
                        else if(str.equals(products[1])) {
                            Intent int1 = new Intent(Select_Collage.this, MainListDisplay.class);
                            startActivity(int1);
    
                        }
                    }
                });
                /**
                 * Enabling Search Filter
                 * */
                inputSearch.addTextChangedListener(new TextWatcher() {
    
                    @Override
                    public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
                        // When user changed the Text
                        Select_Collage.this.adapter.getFilter().filter(cs);
                    }
    
                    @Override
                    public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
                                                  int arg3) {
                        // TODO Auto-generated method stub
    
                    }
    
                    @Override
                    public void afterTextChanged(Editable arg0) {
                        // TODO Auto-generated method stub
                    }
    
    
                });
                    }
    
            public void getCollege () {
                SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
                SharedPreferences.Editor editor = preferences.edit();
                if (str.equals(products[0]))
                {
                    editor.putInt("key", 1);
                    editor.apply();
                    //Intent int0 = new Intent(getAppl,TestYip.class);
                    //Intent int0 = new Intent(getApplicationContext(),TestYip.class);
                    //startActivity(int0);
                } else {
                    editor.putInt("key", 0);
                    editor.apply();
                }
            }
        }
    
    package notes.test.firebase;
    导入java.util.ArrayList;
    导入java.util.HashMap;
    导入android.content.Intent;
    导入android.content.SharedReferences;
    导入android.os.Build;
    导入android.os.Bundle;
    导入android.preference.PreferenceManager;
    导入android.support.v7.app.AppActivity;
    导入android.text.Editable;
    导入android.text.TextWatcher;
    导入android.view.view;
    导入android.view.Window;
    导入android.view.WindowManager;
    导入android.widget.AdapterView;
    导入android.widget.ArrayAdapter;
    导入android.widget.EditText;
    导入android.widget.ListView;
    导入android.widget.TextView;
    公共类选择拼贴扩展AppCompative活动{
    //列表视图
    公共列表视图lv;
    公共图文电视;
    公共字符串str;
    //列表视图适配器
    阵列适配器;
    //搜索编辑文本
    编辑文本输入搜索;
    最终字符串产品[]={“杰佩大学古纳”、“德里大学”、“图形时代”、“UPES”,
    “友好大学”、“萨拉达大学”,
    “ITM瓜利尔”、“RKDF大学”、“因达拉斯特大学”、“印度理工学院德里分校”};
    //Listview的ArrayList
    ArrayList产品列表;
    @凌驾
    创建时的公共void(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(右布局拼贴);
    如果(Build.VERSION.SDK_INT>=21){
    Window=getWindow();
    添加标志(WindowManager.LayoutParams.FLAG\u绘图\u系统\u栏\u背景);
    window.clearFlags(WindowManager.LayoutParams.FLAG\u半透明\u状态);
    setStatusBarColor(getResources().getColor(R.color.colorPrimaryDark));
    }
    //列表视图数据
    /*最终字符串产品[]={“杰佩大学古纳”、“德里大学”、“图形时代”、“UPES”,
    “友好大学”、“萨拉达大学”,
    “ITM瓜利尔”、“RKDF大学”、“因达拉斯特大学”、“印度理工学院德里分校”};
    */
    lv=(ListView)findViewById(R.id.list\u视图);
    inputSearch=(EditText)findViewById(R.id.inputSearch);
    //向listview添加项目
    适配器=新阵列适配器(此,R.layout.college\u selection\u text\u view,R.id.product\u name,products);
    低压设置适配器(适配器);
    lv.setOnItemClickListener(新的AdapterView.OnItemClickListener(){
    @凌驾
    公共单击(适配器视图arg0,视图arg1,内部位置,
    长arg3){
    tv=(TextView)arg1.findViewById(R.id.product\u name);
    str=tv.getText().toString().trim();
    if(str.equals(乘积[0]))
    {
    Intent int0=新Intent(选择Collage.this、TestYip.class);
    星触觉(int0);
    }
    else如果(str.equals(乘积[1])){
    Intent int1=新Intent(选择拼贴.this,MainListDisplay.class);
    星触觉(int1);
    }
    }
    });
    /**
    *启用搜索筛选器
    * */
    inputSearch.addTextChangedListener(新的TextWatcher(){
    @凌驾
    public void onTextChanged(字符序列cs、int arg1、int arg2、int arg3){
    //当用户更改文本时
    选择拼贴.this.adapter.getFilter().filter(cs);
    }
    @凌驾
    更改前的公共void(字符序列arg0、int arg1、int arg2、,
    int arg3){
    //TODO自动生成的方法存根
    }
    @凌驾
    public void PostTextChanged(可编辑arg0){
    //TODO自动生成的方法存根
    }
    });
    }
    公共学院(){
    SharedReferences preferences=PreferenceManager.GetDefaultSharedReferences(此);
    
    SharedReferences.Editor=首选项.edit(); if(str.equals(乘积[0])) { 编辑:putInt(“键”,1); editor.apply(); //Intent int0=新的Intent(getAppl,TestYip.class); //Intent int0=新Intent(getApplicationContext(),TestYip.class); //星触觉(int0); }否则{ 编辑器.putInt(“键”,0); editor.apply(); } } }
  • 物流活动

    package notes.test.firebase;
    
    import android.content.Intent;
    import android.content.SharedPreferences;
    import android.os.Bundle;
    import android.preference.PreferenceManager;
    import android.support.annotation.NonNull;
    import android.support.v7.app.AppCompatActivity;
    import android.support.v7.widget.Toolbar;
    import android.text.TextUtils;
    import android.view.View;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.ProgressBar;
    import android.widget.Toast;
    
    import com.google.android.gms.tasks.OnCompleteListener;
    import com.google.android.gms.tasks.Task;
    import com.google.firebase.auth.AuthResult;
    import com.google.firebase.auth.FirebaseAuth;
    
    public class LoginActivity extends AppCompatActivity {
    
        private EditText inputEmail, inputPassword;
        private FirebaseAuth auth;
        private ProgressBar progressBar;
        private Button btnSignup, btnLogin, btnReset;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
    
            //Get Firebase auth instance
            auth = FirebaseAuth.getInstance();
    
            if (auth.getCurrentUser() != null ) {
                Select_Collage s = new Select_Collage();
                //s.getCollege();
                //startActivity(new Intent(LoginActivity.this, MainActivity.class));
                s.getCollege();
                SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
                int i = preferences.getInt("key",0);
                ///startActivity(new Intent(LoginActivity.this, MainActivity.class));
                if (i==1)
                {
                    startActivity(new Intent(LoginActivity.this, TestYip.class));
                }
                else
                    startActivity(new Intent(LoginActivity.this, MainActivity.class));
    
    
            }
    
            // set the view now
            setContentView(R.layout.activity_login);
    
            Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
            setSupportActionBar(toolbar);
    
            inputEmail = (EditText) findViewById(R.id.email);
            inputPassword = (EditText) findViewById(R.id.password);
            progressBar = (ProgressBar) findViewById(R.id.progressBar);
            btnSignup = (Button) findViewById(R.id.btn_signup);
            btnLogin = (Button) findViewById(R.id.btn_login);
            btnReset = (Button) findViewById(R.id.btn_reset_password);
    
            //Get Firebase auth instance
            auth = FirebaseAuth.getInstance();
    
            btnSignup.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    startActivity(new Intent(LoginActivity.this, SignupActivity.class));
                }
            });
    
            btnReset.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    startActivity(new Intent(LoginActivity.this, ResetPasswordActivity.class));
                }
            });
    
            btnLogin.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    String email = inputEmail.getText().toString();
                    final String password = inputPassword.getText().toString();
    
                    if (TextUtils.isEmpty(email)) {
                        Toast.makeText(getApplicationContext(), "Enter email address!", Toast.LENGTH_SHORT).show();
                        return;
                    }
    
                    if (TextUtils.isEmpty(password)) {
                        Toast.makeText(getApplicationContext(), "Enter password!", Toast.LENGTH_SHORT).show();
                        return;
                    }
    
                    progressBar.setVisibility(View.VISIBLE);
    
                    //authenticate user
                    auth.signInWithEmailAndPassword(email, password)
                            .addOnCompleteListener(LoginActivity.this, new OnCompleteListener<AuthResult>() {
                                @Override
                                public void onComplete(@NonNull Task<AuthResult> task) {
                                    // If sign in fails, display a message to the user. If sign in succeeds
                                    // the auth state listener will be notified and logic to handle the
                                    // signed in user can be handled in the listener.
                                    progressBar.setVisibility(View.GONE);
                                    if (!task.isSuccessful()) {
                                        // there was an error
                                        if (password.length() < 6) {
                                            inputPassword.setError(getString(R.string.minimum_password));
                                        } else {
                                            Toast.makeText(LoginActivity.this, getString(R.string.auth_failed), Toast.LENGTH_LONG).show();
                                        }
                                    } else {
                                        Intent intent = new Intent(LoginActivity.this, MainActivity.class);
                                        startActivity(intent);
                                        finish();
                                    }
                                }
                            });
                }
            });
        }
    }
    
    package notes.test.firebase;
    导入android.content.Intent;
    导入android.content.SharedReferences;
    导入android.os.Bundle;
    导入android.preference.PreferenceManager;
    导入android.support.annotation.NonNull;
    导入android.support.v7.app.AppActivity;
    导入android.support.v7.widget.Toolbar;
    导入android.text.TextUtils;
    导入android.view.view;
    导入android.widget.Button;
    导入android.widget.EditText;
    导入android.widget.ProgressBar;
    导入android.widget.Toast;
    导入com.google.android.gms.tasks.OnCompleteListener;
    导入com.google.android.gms.tasks.Task;
    导入com.google.firebase.auth.AuthResult;
    进口
    
    <?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="notes.test.firebase">
    
        <uses-permission android:name="android.permission.INTERNET" />
    
        <!-- To auto-complete the email text field in the login form with the user's emails -->
        <uses-permission android:name="android.permission.GET_ACCOUNTS" />
        <uses-permission android:name="android.permission.READ_PROFILE" />
        <uses-permission android:name="android.permission.READ_CONTACTS" />
    
        <application
            android:allowBackup="true"
            android:icon="@mipmap/ic_launcher"
            android:label="@string/app_name"
            android:supportsRtl="true"
            android:theme="@style/AppTheme">
            <activity
                android:name=".LoginActivity"
                android:theme="@style/AppTheme.NoActionBar">
                <intent-filter>
                    <action android:name="android.intent.action.MAIN" />
    
                    <category android:name="android.intent.category.LAUNCHER" />
                </intent-filter>
            </activity>
            <activity
                android:name=".MainActivity"
                android:label="@string/title_activity_profile"
                android:theme="@style/AppTheme.NoActionBar">
    
    
    
    
            </activity>
            <activity
                android:name=".SignupActivity"
                android:label="@string/title_activity_login"
                android:theme="@style/AppTheme.NoActionBar" />
            <activity
                android:name=".ResetPasswordActivity"
                android:label="@string/title_activity_reset_password"
                android:theme="@style/AppTheme.NoActionBar" />
            <activity
                android:name=".TestYip"
                android:label="@string/title_test"
                android:theme="@style/AppTheme.NoActionBar" />
            <activity android:name=".Computer_Notes" />
            <activity
                android:name=".MainListDisplay"
                android:label="@string/Select_Subject"
                android:theme="@style/AppTheme.NoActionBar" >
            <meta-data
                android:name="android.app.default_searchable"
                android:value=".SearchResulltsActivity" />
            </activity>
            <activity
                android:name=".Select_Collage"
                android:label="@string/Select_Collage"
                android:theme="@style/AppTheme.NoActionBar">
            <meta-data
                android:name="android.app.default_searchable"
                android:value=".SearchResulltsActivity" />
            </activity>
    
            <meta-data
                android:name="android.app.searchable"
                android:resource="@xml/searchable" />
    
            <activity android:name=".SearchResulltsActivity"
                      android:theme="@style/AppTheme.NoActionBar">
                <meta-data android:name="android.support.PARENT_ACTIVITY"
                    android:value=".MainActivity"/>
                <intent-filter>
                    <action android:name="android.intent.action.SEARCH" />
                </intent-filter>
                <meta-data
                    android:name="android.app.searchable"
                    android:resource="@xml/searchable" />
            </activity>
        </application>
    
    </manifest>
    
    public class SplashScreen extends AppCompatActivity {
    
        private String email;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
    
            requestWindowFeature(Window.FEATURE_NO_TITLE);
            getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
    
            setContentView(R.layout.activity_splash);
    
            //SharedPreference to Store API Result
            SharedPreferences pref = getApplicationContext().getSharedPreferences("CachedResponse", 0);
            SharedPreferences.Editor editor = pref.edit();
            editor.apply();
    
            email = pref.getString("login", null);
    
            int SPLASH_TIME_OUT = 3000;
    
            if (email != null) {
    
                //It means User is already Logged in so I will take the user to Select_College Screen
    
                new Handler().postDelayed(new Runnable() {
    
                    @Override
                    public void run() {
    
                        Intent intent = new Intent(SplashScreen.this, Select_College.class);
                        intent.putExtra("Email", email);
                        startActivity(intent);
                        finish();
    
                    }
    
                }, SPLASH_TIME_OUT);
    
            } else {
    
                //It means User is not Logged in so I will take the user to Login Screen
    
                new Handler().postDelayed(new Runnable() {
    
                    @Override
                    public void run() {
    
                        Intent intent = new Intent(SplashScreen.this, Login.class);
                        startActivity(intent);
                        finish();
    
                    }
    
                }, SPLASH_TIME_OUT);
    
            }
    
        }
    }
    
    public class Login extends AppCompatActivity {
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_doctor_login);
    
            //SharedPreference to Store API Result
            pref = getApplicationContext().getSharedPreferences("CachedResponse", 0);
    
            Login();
    
        }
    
        private void login() {
    
            //If login is successfull, before moving to next activity, store something in sharedpreference with name login. It can be email or just a string as "true"
    
            SharedPreferences.Editor editor = pref.edit();
                            editor.putString("login", email);
                            editor.apply();
    
                            Intent intent = new Intent(DoctorLogin.this, Select_Collage.class);
                            intent.putExtra("Email", email);
                            startActivity(intent);
                            finish();
    
        }
    }
    
    public class Select_Collage extends AppCompatActivity {
    
        private SharedPreferences pref;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_doctor_message);
    
            //SharedPreference to Store API Result
            pref = getApplicationContext().getSharedPreferences("CachedResponse", 0);
    
            //Somewhere on Signout button click, delete the login sharedpreference
            signOut();
    
        }
    
        private void signOut() {
    
            SharedPreferences.Editor editor = pref.edit();
            editor.remove("login");
            editor.apply();
    
            Intent intent = new Intent(Select_Collage.this, Login.class);
            startActivity(intent);
            finish();
    
        }
    }