Android 快速退出应用程序

介绍几种快速退出android应用程序的方法：

1.通过设置栈底Activity的launchMode

Manifest

        <!--将栈底Activity的launchMode设置为singleTask-->        <activity android:name=".MainActivity"            android:launchMode="singleTask">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>

栈底Activity

    //重写onNewIntent方法，finish掉自己    @Override    protected void onNewIntent(Intent intent) {        super.onNewIntent(intent);        finish();    }

在需要退出的地方通过Intent跳转到栈底Activity即可退出整个应用了

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2.通过给Intent setFlag

需要退出的Activity

    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_third);        findViewById(R.id.exit).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                //给Intent setFlag，将任务栈中栈底MainActivity之上的所有Activity finish掉                Intent intent=new Intent(ThirdActivity.this,MainActivity.class);                intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);                startActivity(intent);            }        });    }

在跳转到的Activity

Intent intent = getIntent();        if ((Intent.FLAG_ACTIVITY_CLEAR_TOP & intent.getFlags()) != 0) finish();

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3.通过Application和BaseActivity

定义全局ApplicationContext

public class ApplicationContext extends Application {    //定义List<Activity>，用来存放所有Activity实例    public List<Activity> activities=new ArrayList<>();    //重写onTerminate()，将所有Activity实例finish掉    @Override    public void onTerminate() {        super.onTerminate();        for (Activity activity : activities) {            activity.finish();        }    }}

关联app

    <application        android:allowBackup="true"        android:icon="@mipmap/ic_launcher"        android:label="@string/app_name"        android:supportsRtl="true"        android:theme="@style/AppTheme"        android:name=".ApplicationContext">

定义BaseActivity

public class BaseActivity extends Activity {    protected ApplicationContext app;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        //将当前Activity加进集合        app= (ApplicationContext) getApplication();        app.activities.add(this);    }    @Override    protected void onDestroy() {        super.onDestroy();        //将当前Activity移除集合        app.activities.remove(this);    }}

在需要退出的Acticity

    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_third);        findViewById(R.id.exit).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                //调用ApplicationContext的onTerminate()，finish掉所有未销毁的Activity实例                app.onTerminate();            }        });    }

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