android检测是否跳出应用程序,android – 检测应用程序何时打开/恢复

d60402

here提供的答案以及Hanno Binder使用

Application.registerActivityLifecycleCallbacks()注册活动回调的建议使我得到了这个解决方案.

我将应用程序和已注册的回调扩展到Activity方法onPause和onStart,如下所示.在这些方法中,启动/停止计时器(退出一个活动,其中调用onPause,在调用onStart时输入新的活动).当app确定在后台/前景(真/假)时,标记“wasInBackground”被切换.如果在运行onStart回调时应用程序处于后台,则会调用“appEntered”.如果在onPause和onStart回调之间传递的时间大于指定时间(为活动转换提供足够的时间),则会调用应用程序会话的“appExited”.

public class MyApplication extends Application {

public static final String LOG_TAG = "MyApp";

public boolean wasInBackground = true;

private AppSession appSession;

private Timer mActivityTransitionTimer;

private TimerTask mActivityTransitionTimerTask;

private final long MAX_ACTIVITY_TRANSITION_TIME_MS = 2000; // Time allowed for transitions

Application.ActivityLifecycleCallbacks activityCallbacks = new Application.ActivityLifecycleCallbacks() {

@Override

public void onActivityResumed(Activity activity) {

if (wasInBackground) {

//Do app-wide came-here-from-background code

appEntered();

}

stopActivityTransitionTimer();

}

@Override

public void onActivityPaused(Activity activity) {

startActivityTransitionTimer();

}

...

};

@Override

public void onCreate() {

super.onCreate();

registerActivityLifecycleCallbacks(activityCallbacks);

}

public void startActivityTransitionTimer() {

this.mActivityTransitionTimer = new Timer();

this.mActivityTransitionTimerTask = new TimerTask() {

public void run() {

// Task is run when app is exited

wasInBackground = true;

appExited();

}

};

this.mActivityTransitionTimer.schedule(mActivityTransitionTimerTask,MAX_ACTIVITY_TRANSITION_TIME_MS);

}

public void stopActivityTransitionTimer() {

if (this.mActivityTransitionTimerTask != null) {

this.mActivityTransitionTimerTask.cancel();

}

if (this.mActivityTransitionTimer != null) {

this.mActivityTransitionTimer.cancel();

}

this.wasInBackground = false;

}

private void appEntered() {

Log.i(LOG_TAG,"APP ENTERED");

appSession = new AppSession();

}

private void appExited() {

Log.i(LOG_TAG,"APP EXITED");

appSession.finishAppSession();

// Submit AppSession to server

submitAppSession(appSession);

long sessionLength = (appSession.getT_close() - appSession.getT_open())/1000L;

Log.i(LOG_TAG,"Session Length: " + sessionLength);

}