The question:
I need to keep broadcast receiver running all the time after app has been started.
Here is the code that registers this receiver in the application
IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
filter.addAction(Intent.ACTION_SCREEN_OFF);
BroadcastReceiver mReceiver = new ScreenEventsReceiver();
registerReceiver(mReceiver, filter);
And code for receiver
public class ScreenEventsReceiver extends BroadcastReceiver {
public static boolean wasScreenOn = true;
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
wasScreenOn = false;
Log.d("ScreenEventReceiver", "ON");
} else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
wasScreenOn = true;
Log.d("ScreenEventReceiver", "ON");
}
}
}
The Solutions:
Below are the methods you can try. The first solution is probably the best. Try others if the first one doesn’t work. Senior developers aren’t just copying/pasting – they read the methods carefully & apply them wisely to each case.
Method 1
You can use a service
In main app start/stop the service
Intent service = new Intent(context, MyService.class);
context.startService(service);
...
Intent service = new Intent(context, MyService.class);
context.stopService(service);
service
public class MyService extends Service
{
private static BroadcastReceiver m_ScreenOffReceiver;
@Override
public IBinder onBind(Intent arg0)
{
return null;
}
@Override
public void onCreate()
{
registerScreenOffReceiver();
}
@Override
public void onDestroy()
{
unregisterReceiver(m_ScreenOffReceiver);
m_ScreenOffReceiver = null;
}
private void registerScreenOffReceiver()
{
m_ScreenOffReceiver = new BroadcastReceiver()
{
@Override
public void onReceive(Context context, Intent intent)
{
Log.d(TAG, "ACTION_SCREEN_OFF");
// do something, e.g. send Intent to main app
}
};
IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_OFF);
registerReceiver(m_ScreenOffReceiver, filter);
}
}
Method 2
Accepted answer is not an actual answer i think. I will explain what the issue. I think you are testing your app in the Huawie, Oppo, Vivo, Xiomi,asus……. or some devices. With that devices if we close the application they will also close our broadcast receivers. So thats the problem.(To check that use a with pixel nexus emulator). I will explain how to resolve this.“
-
we would add our app to the protected app list. OS only allow to them to continue broadcast receiver activities.(Copy this array declaration to your code)
private static final Intent[] POWERMANAGER_INTENTS = { new Intent().setComponent(new ComponentName("com.miui.securitycenter", "com.miui.permcenter.autostart.AutoStartManagementActivity")), new Intent().setComponent(new ComponentName("com.letv.android.letvsafe", "com.letv.android.letvsafe.AutobootManageActivity")), new Intent().setComponent(new ComponentName("com.huawei.systemmanager", "com.huawei.systemmanager.optimize.process.ProtectActivity")), new Intent().setComponent(new ComponentName("com.huawei.systemmanager", "com.huawei.systemmanager.appcontrol.activity.StartupAppControlActivity")), new Intent().setComponent(new ComponentName("com.coloros.safecenter", "com.coloros.safecenter.permission.startup.StartupAppListActivity")), new Intent().setComponent(new ComponentName("com.coloros.safecenter", "com.coloros.safecenter.startupapp.StartupAppListActivity")), new Intent().setComponent(new ComponentName("com.oppo.safe", "com.oppo.safe.permission.startup.StartupAppListActivity")), new Intent().setComponent(new ComponentName("com.iqoo.secure", "com.iqoo.secure.ui.phoneoptimize.AddWhiteListActivity")), new Intent().setComponent(new ComponentName("com.iqoo.secure", "com.iqoo.secure.ui.phoneoptimize.BgStartUpManager")), new Intent().setComponent(new ComponentName("com.vivo.permissionmanager", "com.vivo.permissionmanager.activity.BgStartUpManagerActivity")), new Intent().setComponent(new ComponentName("com.samsung.android.lool", "com.samsung.android.sm.ui.battery.BatteryActivity")), new Intent().setComponent(new ComponentName("com.htc.pitroad", "com.htc.pitroad.landingpage.activity.LandingPageActivity")), new Intent().setComponent(new ComponentName("com.asus.mobilemanager", "com.asus.mobilemanager.MainActivity"))}; -
Put these code to your onCreate Method. Here i used shared preference for check it only first time of the app open.
`
final SharedPreferences.Editor pref = getSharedPreferences("allow_notify", MODE_PRIVATE).edit(); pref.apply(); final SharedPreferences sp = getSharedPreferences("allow_notify", MODE_PRIVATE)`;
if(!sp.getBoolean("protected",false)) {
for (final Intent intent : POWERMANAGER_INTENTS)
if (getPackageManager().resolveActivity(intent, PackageManager.MATCH_DEFAULT_ONLY) != null) {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Alert Title").setMessage("Alert Body")
.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
startActivity(intent);
sp.edit().putBoolean("protected",true).apply();
}
})
.setCancelable(false)
.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
})
.create().show();
break;
Method 3
Be careful if you are using Android 4.4.x as there is a bug which kills background services when closing the app. I was testing my app in Android 4.4.2 and I had the same problem. Here there is a detailed explanation:
Method 4
You cannot receive some broadcast events through components declared in manifest.
These events are
- ACTION_BATTERY_CHANGED
- ACTION_CONFIGURATION_CHANGED
- ACTION_SCREEN_OFF (You are playing with this event)
- ACTION_SCREEN_ON (You are playing with this event)
- ACTION_TIME_TICK
Reference https://developer.android.com/reference/android/content/Intent.html#ACTION_SCREEN_ON
So in your specific events,
you will have to create a Service & you will have to register your event explicitly in service onCreate() with with Context.registerReceiver().
For other events,
entry in manifest is sufficient.
Method 5
If you declare BroadcastReceiver in the Manifest, it will always be active and be called even if the application is closed/stopped
Method 6
You could start a service that is running in the foreground. That’s the only way to ensure (mostly) that your app will get the events. There is still a chance that your foreground service could get killed in times of crazy memory pressure from the OS (so it’s not foolproof). If you start a service in the foreground, the user will see a persistent notification to know that it is always running, though.
So the moral of the story is, do you really need to monitor the screen off/on events at all times? The reason that they force you to register a receiver not in the manifest is that they don’t want people to always be monitoring these events and slowing down the device. What are you trying to accomplish?
Method 7
The best way I found is the Foreground Services. I registered my BroadcastReceiver from my Service only under the onStartCommand() as I want my service needs to run always, I returned START_STICKY
This way, my broadcast receiver survives even after terminating the app from stack.
Used below code in my service
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.i("rht", "Received start id " + startId + ": " + intent);
String input = intent.getStringExtra("inputExtra");
createNotificationChannel();
Intent notificationIntent = new Intent(this, MainActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(this,
0, notificationIntent, 0);
Notification notification = new NotificationCompat.Builder(this, CHANNEL_ID)
.setContentTitle("Foreground Service")
.setContentText(input)
.setSmallIcon(R.drawable.ic_launcher_background)
.setContentIntent(pendingIntent)
.build();
startForeground(1, notification);
}
This is how I started my service
Intent serviceIntent = new Intent(this, SpeechServiceForeground.class);
ContextCompat.startForegroundService(this, serviceIntent);
All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0