android应用判断app息屏、切换到前台或者后台

Application里面直接搞定，废话不说直接上代码

public class MyApplication extends Application {

    private boolean isBackground = true;

    @Override
    public void onCreate() {
        super.onCreate();
        listenForForeground();
        listenForScreenTurningOff();
    }

    //手机息屏
    private void listenForScreenTurningOff() {
        IntentFilter screenStateFilter = new IntentFilter(Intent.ACTION_SCREEN_OFF);
        registerReceiver(new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                isBackground = true;
                notifyBackground();
            }
        }, screenStateFilter);
    }

    //应用切换至前台
    private void listenForForeground() {
        registerActivityLifecycleCallbacks(new ActivityLifecycleCallbacks() {
            @Override
            public void onActivityCreated(Activity activity, Bundle savedInstanceState) {

            }

            @Override
            public void onActivityStarted(Activity activity) {

            }

            @Override
            public void onActivityResumed(Activity activity) {
                if (isBackground) {
                    isBackground = false;
                }

            }

            @Override
            public void onActivityPaused(Activity activity) {

            }

            @Override
            public void onActivityStopped(Activity activity) {

            }

            @Override
            public void onActivitySaveInstanceState(Activity activity, Bundle outState) {

            }

            @Override
            public void onActivityDestroyed(Activity activity) {

            }
        });
    }

    //应用切换至后台
    @Override
    public void onTrimMemory(int level) {
        super.onTrimMemory(level);
        if (level == TRIM_MEMORY_UI_HIDDEN) {
            isBackground = true;
            notifyBackground();
        }


    }

    private void notifyForeground() {
        // This is where you can notify listeners, handle session tracking, etc
    }


    private void notifyBackground() {
        // This is where you can notify listeners, handle session tracking, etc
    }

    public boolean isBackground() {
        return isBackground;
    }

}