在Android中原生监听应用的前台或后台切换

public class AppLifecycleListener implements Application.ActivityLifecycleCallbacks {
    @Override
    public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
        // Activity创建时调用
    }

    @Override
    public void onActivityStarted(Activity activity) {
        // Activity启动时调用
    }

    @Override
    public void onActivityResumed(Activity activity) {
        // Activity恢复时调用，即应用切换到前台
    }

    @Override
    public void onActivityPaused(Activity activity) {
        // Activity暂停时调用，即应用切换到后台
    }

    @Override
    public void onActivityStopped(Activity activity) {
        // Activity停止时调用
    }

    @Override
    public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
        // Activity保存状态时调用
    }

    @Override
    public void onActivityDestroyed(Activity activity) {
        // Activity销毁时调用
    }
}

public class MyApplication extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        registerActivityLifecycleCallbacks(new AppLifecycleListener());
    }
}

<application
    android:name=".MyApplication"
    ...
</application>