Register opening and closing android app

Issue

How can I register when the user open and close my app? I want to register every opening and every closing.

Lifecycle methods for example onResume() are not effective because the app use multiple activitys.

I can't find anything about that.

Solution

the best way to check if the app is exited or run is like this:

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);
}

Answered By - Orvenito