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package com.mapswithme.maps.background;
import android.app.Activity;
import android.app.Application;
import android.os.Bundle;
import android.util.SparseArray;
import java.lang.ref.WeakReference;
import com.mapswithme.maps.MwmApplication;
import com.mapswithme.util.Listeners;
import com.mapswithme.util.concurrency.UiThread;
import com.mapswithme.util.log.Logger;
import com.mapswithme.util.log.LoggerFactory;
/**
* Helper class that detects when the application goes to background and back to foreground.
* <br/>Must be created as early as possible, i.e. in Application.onCreate().
*/
public final class AppBackgroundTracker
{
private static final Logger LOGGER = LoggerFactory.INSTANCE.getLogger(LoggerFactory.Type.MISC);
private static final String TAG = AppBackgroundTracker.class.getSimpleName();
private static final int TRANSITION_DELAY_MS = 1000;
private final Listeners<OnTransitionListener> mTransitionListeners = new Listeners<>();
private final Listeners<OnVisibleAppLaunchListener> mVisibleAppLaunchListeners = new Listeners<>();
private SparseArray<WeakReference<Activity>> mActivities = new SparseArray<>();
private volatile boolean mForeground;
private final Runnable mTransitionProc = new Runnable()
{
@Override
public void run()
{
SparseArray<WeakReference<Activity>> newArray = new SparseArray<>();
for (int i = 0; i < mActivities.size(); i++)
{
int key = mActivities.keyAt(i);
WeakReference<Activity> ref = mActivities.get(key);
Activity activity = ref.get();
if (activity != null && !activity.isFinishing())
newArray.put(key, ref);
}
mActivities = newArray;
boolean old = mForeground;
mForeground = (mActivities.size() > 0);
if (mForeground != old)
notifyTransitionListeners();
}
};
/** @noinspection FieldCanBeLocal*/
private final Application.ActivityLifecycleCallbacks mAppLifecycleCallbacks = new Application.ActivityLifecycleCallbacks()
{
private void onActivityChanged()
{
UiThread.cancelDelayedTasks(mTransitionProc);
UiThread.runLater(mTransitionProc, TRANSITION_DELAY_MS);
}
@Override
public void onActivityStarted(Activity activity)
{
LOGGER.d(TAG, "onActivityStarted activity = " + activity);
if (mActivities.size() == 0)
notifyVisibleAppLaunchListeners();
mActivities.put(activity.hashCode(), new WeakReference<>(activity));
onActivityChanged();
}
@Override
public void onActivityStopped(Activity activity)
{
LOGGER.d(TAG, "onActivityStopped activity = " + activity);
mActivities.remove(activity.hashCode());
onActivityChanged();
}
@Override
public void onActivityCreated(Activity activity, Bundle savedInstanceState)
{
LOGGER.d(TAG, "onActivityCreated activity = " + activity);
}
@Override
public void onActivityDestroyed(Activity activity)
{
LOGGER.d(TAG, "onActivityDestroyed activity = " + activity);
}
@Override
public void onActivityResumed(Activity activity)
{
LOGGER.d(TAG, "onActivityResumed activity = " + activity);
}
@Override
public void onActivityPaused(Activity activity)
{
LOGGER.d(TAG, "onActivityPaused activity = " + activity);
}
@Override
public void onActivitySaveInstanceState(Activity activity, Bundle outState)
{
LOGGER.d(TAG, "onActivitySaveInstanceState activity = " + activity);
}
};
public interface OnTransitionListener
{
void onTransit(boolean foreground);
}
public interface OnVisibleAppLaunchListener
{
void onVisibleAppLaunch();
}
public AppBackgroundTracker()
{
MwmApplication.get().registerActivityLifecycleCallbacks(mAppLifecycleCallbacks);
}
public boolean isForeground()
{
return mForeground;
}
private void notifyTransitionListeners()
{
for (OnTransitionListener listener : mTransitionListeners)
listener.onTransit(mForeground);
mTransitionListeners.finishIterate();
}
private void notifyVisibleAppLaunchListeners()
{
for (OnVisibleAppLaunchListener listener : mVisibleAppLaunchListeners)
listener.onVisibleAppLaunch();
mVisibleAppLaunchListeners.finishIterate();
}
public void addListener(OnTransitionListener listener)
{
mTransitionListeners.register(listener);
}
public void removeListener(OnTransitionListener listener)
{
mTransitionListeners.unregister(listener);
}
public void addListener(OnVisibleAppLaunchListener listener)
{
mVisibleAppLaunchListeners.register(listener);
}
public void removeListener(OnVisibleAppLaunchListener listener)
{
mVisibleAppLaunchListeners.unregister(listener);
}
@androidx.annotation.UiThread
public Activity getTopActivity()
{
return (mActivities.size() == 0 ? null : mActivities.get(mActivities.keyAt(0)).get());
}
}
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