Android 检查应用程序是否已关闭 [英] Android checking whether the app is closed

问题描述

我有一个 android 应用程序，我需要一个功能或任何可以检查应用程序是否关闭的广播接收器..我不需要在每个活动中调用销毁(应用程序中大约有 20 个活动)我试图在应用程序类

I have an android application i need one function or any broadcast receiver that can check if the app is closed.. i don't need to call on destroy in every activity (there is about 20 activity into the app) i tried to add this function in Application class

public class ApplicationLifeCycleManager implements ActivityLifecycleCallbacks {

/** Manages the state of opened vs closed activities, should be 0 or 1.
 * It will be 2 if this value is checked between activity B onStart() and
 * activity A onStop().
 * It could be greater if the top activities are not fullscreen or have
 * transparent backgrounds.
 */
private static int visibleActivityCount = 0;

/** Manages the state of opened vs closed activities, should be 0 or 1
 * because only one can be in foreground at a time. It will be 2 if this
 * value is checked between activity B onResume() and activity A onPause().
 */
private static int foregroundActivityCount = 0;

/** Returns true if app has foreground */
public static boolean isAppInForeground(){
    return foregroundActivityCount > 0;
}

/** Returns true if any activity of app is visible (or device is sleep when
 * an activity was visible) */
public static boolean isAppVisible(){
    return visibleActivityCount > 0;
}

public void onActivityCreated(Activity activity, Bundle bundle) {
}

public void onActivityDestroyed(Activity activity) {
    Log.wtf("destroyed","app closed!!");
}

public void onActivityResumed(Activity activity) {
    foregroundActivityCount ++;
}

public void onActivityPaused(Activity activity) {
    foregroundActivityCount --;
}

public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
}

public void onActivityStarted(Activity activity) {
    visibleActivityCount ++;
}

public void onActivityStopped(Activity activity) {
    visibleActivityCount --;
}
}

我也在应用程序类

@Override
public void onCreate() {
    super.onCreate();
    registerActivityLifecycleCallbacks(new ApplicationLifeCycleManager());
}

但是当我在活动之间切换时会调用 onPaused 和 onResumed 和 onDestroyed 函数:因为它检测是否有任何活动被关闭或销毁甚至恢复

but the onPaused and onResumed and onDestroyed function is called when i switch between activity: because it detects whether any activity is closed or destroyed or even resumed

那么有什么解决方案可以检查应用程序是否在一个功能中关闭??

so any solution to check whether the app is closed in one function??

推荐答案

这个答案使用 ProcessLifecycleOwner 来检测应用程序的可见性.

This answer uses ProcessLifecycleOwner to detect application visibility.

它是 Android 架构组件的一部分.

实现android.arch.lifecycle:extensions:1.1.1"

public class AppController extends Application implements LifecycleObserver {


///////////////////////////////////////////////
    @OnLifecycleEvent(Lifecycle.Event.ON_START)
    public void onEnterForeground() {
        Log.d("AppController", "Foreground");
        isAppInBackground(false);
    }
    @OnLifecycleEvent(Lifecycle.Event.ON_STOP)
    public void onEnterBackground() {
        Log.d("AppController", "Background");
        isAppInBackground(true);
    }
///////////////////////////////////////////////



    // Adding some callbacks for test and log
    public interface ValueChangeListener {
        void onChanged(Boolean value);
    }
    private ValueChangeListener visibilityChangeListener;
    public void setOnVisibilityChangeListener(ValueChangeListener listener) {
        this.visibilityChangeListener = listener;
    }
    private void isAppInBackground(Boolean isBackground) {
        if (null != visibilityChangeListener) {
            visibilityChangeListener.onChanged(isBackground);
        }
    }
    private static AppController mInstance;
    public static AppController getInstance() {
        return mInstance;
    }

   
   
    @Override
    public void onCreate() {
        super.onCreate();

        mInstance = this;

        // addObserver
        ProcessLifecycleOwner.get().getLifecycle().addObserver(this);
    }

}

并像这样使用它:

AppController.getInstance().setOnVisibilityChangeListener(new ValueChangeListener() {
    @Override
    public void onChanged(Boolean value) {
        Log.d("isAppInBackground", String.valueOf(value));
    }
});

不要忘记将应用程序name 添加到您的manifest

Don't forget to add application name into your manifest

<application
    android:name="myPackageName.AppController"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"">

完成.

(Kotlin 示例)

https://github.com/jshvarts/AppLifecycleDemo

这篇关于Android 检查应用程序是否已关闭的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！