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public class MyAppActivityCallbacks implements Application.ActivityLifecycleCallbacks { | |
private Set<Class<Activity>> visibleActivities = new HashSet<>(); | |
@Override | |
public void onActivityResumed(Activity activity) { | |
visibleActivities.add((Class<Activity>) activity.getClass()); | |
} | |
@Override | |
public void onActivityStopped(Activity activity) { | |
visibleActivities.remove(activity.getClass()); | |
} | |
public boolean isAnyActivityVisible() { | |
return !visibleActivities.isEmpty(); | |
} | |
@Override | |
public void onActivityCreated(Activity activity, Bundle savedInstanceState) {} | |
@Override | |
public void onActivityStarted(Activity activity) {} | |
@Override | |
public void onActivityPaused(Activity activity) {} | |
@Override | |
public void onActivityDestroyed(Activity activity) {} | |
@Override | |
public void onActivitySaveInstanceState(Activity activity, Bundle outState) {} | |
} | |
class App extends Application{ | |
@Override | |
public void onCreate() { | |
registerActivityLifecycleCallbacks(myAppActivityCallbacks); | |
} | |
} |
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