Develop Reference

Google Play OBB downloader library crashes on Android 8.0

OBB downloader library seems to use Context.startService(...) to download OBB in background, but on Android 8.0 this leads to crashes, if app itself is in the background.
This library registers a BroadcastReceiver:
mConnReceiver = new InnerBroadcastReceiver(this);
IntentFilter intentFilter = new IntentFilter(
ConnectivityManager.CONNECTIVITY_ACTION);
intentFilter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION);
registerReceiver(mConnReceiver, intentFilter);
Receiver istelf:
private class InnerBroadcastReceiver extends BroadcastReceiver {
final Service mService;
InnerBroadcastReceiver(Service service) {
mService = service;
}
#Override
public void onReceive(Context context, Intent intent) {
pollNetworkState();
if (mStateChanged
&& !isServiceRunning()) {
Log.d(Constants.TAG, "InnerBroadcastReceiver Called");
Intent fileIntent = new Intent(context, mService.getClass());
fileIntent.putExtra(EXTRA_PENDING_INTENT, mPendingIntent);
// send a new intent to the service
context.startService(fileIntent);
}
}
};
Crash stack stace:
Downloader service crash
So, what is the preferred way to avoid such crashes? Or this user experience is normal in Android 8.0+?

How to delete downloaded apk file right after it install to phone

I'v already read post about:
BroadcastReceiver myReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
// do whatever you want to do
}
};
registerReceiver(myReceiver, new IntentFilter("ACTION"));
unregisterReceiver(myReceiver);
Intents:
ACTION_PACKAGE_INSTALL
ACTION_PACKAGE_REPLACED
ACTION_PACKAGE_CHANGED
ACTION_PACKAGE_ADDED
How to do subject or when installation failed

Android: BroadcastReceiver to know via code when the screen in on/off

I've a Broadcast receiver:
public class ScreenReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
//Do something
} else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
Intent start=new Intent(context,MainActivity.class);
context.startActivity(start);
}
}
}
And, in my activity, into onCreate():
IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
filter.addAction(Intent.ACTION_SCREEN_OFF);
ScreenReceiver mReceiver=new ScreenReceiver();
registerReceiver(mReceiver, filter);
The problem is that, when my activity is displayed, the receiver performs correctly the action, but when it is in background, sometimes nothing happens.
What could be the issue?

Most likely, when your app goes into the background Android kills it to free up resources. Try starting a foreground service attached to an ongoing notification from your Activity, and register the BroadcastReceiver in that.

send action from receiver to activity?

I am using broadcast receiver in my app to detect incomming call and it works fine. But problem is I can not send action to activity. I mean.. I want do something in activity not in receiver. I read many tutorial but they all are performing action in receiver. Any idea ?

You can declare a BroadcastReceiver as inner class of the Activity. In this case you can directly call activity's methods:
public class MyActivity extends Activity {
private final BroadcastReceiver receiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
activityMethod();
}
};
private final IntentFilter filter = new IntentFilter("android.intent.action.PHONE_STATE");
#Override
protected void onStart() {
super.onResume();
registerReceiver(receiver, filter);
}
#Override
protected void onStop() {
super.onPause();
unregisterReceiver(receiver);
}
private void activityMethod() {
}
}

You can start the Activity using an Intent and put a command code in the Intent extra fields. In your Activity you can then decide the behaviour based on the command code or resort to a default behaviour if none is present.

You can start an activity from your receiver via the normal means:
#Override
public void onReceive(Context context, Intent intent) {
Intent i = new Intent(context, YourActivity.class);
startActivity(i);
}
Note though that the user is going to expect that the phone application starts up since they are receiving a phone call. It is very likely a bad idea to hijack the phone call by dumping your own activity on top of the stock dialer app.

POWER connected and disconnected listeners

I am listening to both connecting and disonnecting the power for my galaxy.
I have creatd 2 BroadCastReceivers, one for connect, and one for disconnect.
When I try to implement, I only get the connected data, even when disconnecting the power cable.
The intent is sent, but looks like it's the wrong one.
Here is the activity code:
// Handle Power On
PowerConnectedBCReceiver myPowerConnectedBCReceiver = new PowerConnectedBCReceiver();
IntentFilter intentPowerOnFilter = new IntentFilter();
intentPowerOnFilter.addAction("android.intent.action.ACTION_POWER_CONNECTED");
registerReceiver(myPowerConnectedBCReceiver, intentPowerOnFilter);
BroadcastReceiver PowerConnectedReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
showToast("connected");
}
};
// Handle Power Off
PowerConnectedBCReceiver myPowerDisonnectedBCReceiver = new PowerConnectedBCReceiver();
IntentFilter intentPowerDisconnectedOnFilter = new IntentFilter();
intentPowerDisconnectedOnFilter.addAction("android.intent.action.ACTION_POWER_DISCONNECTED");
registerReceiver(myPowerDisonnectedBCReceiver, intentPowerDisconnectedOnFilter);
BroadcastReceiver PowerDisconnectedReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
showToast("disconnected");
}
};
Registering both BC to do the work
registerReceiver(PowerDisconnectedReceiver, new IntentFilter("com.neglected.POWER_DISCONNECTED"));
registerReceiver(PowerConnectedReceiver, new IntentFilter("com.neglected.POWER_CONNECTED"));
BroadCast connected code:
public class PowerConnectedBCReceiver extends BroadcastReceiver
{
#Override
public void onReceive(Context context, Intent intent)
{
Toast.makeText(context, "Phone was connected to power" , Toast.LENGTH_LONG).show();
Intent tIntent = new Intent("com.neglected.POWER_CONNECTED");
context.sendBroadcast(tIntent);
}
}
Broadcast disconnected code:
public class PowerDisconnectedBCReceiver extends BroadcastReceiver
{
#Override
public void onReceive(Context context, Intent intent)
{
Toast.makeText(context, "Phone was disconnected from power" , Toast.LENGTH_LONG).show();
Intent tIntent = new Intent("com.neglected.POWER_DISCONNECTED");
context.sendBroadcast(tIntent);
}
}
IS the code wrong?
Can I listen to both actions? seperately?
I can't see extra been sent with the CONNNECTED Action, is there?

Not sure what your last two classes (*BCReeivers) are supposed to be doing. Your first block of code looks ok. It will be limited to the lifecycle of the enclosing Activity if that matters.
For the Galaxy S, you may not be able to rely on those Intents. In particular, I have found that the Verizon Fascinate (their version of the Galaxy S) to be very buggy. See here: http://devblog.bu.mp/how-to-ddos-yourself

There was an error in my Broadcast instantiation. I mistakenly used the PowerConnectedBCReceiver instead of PowerDisconnectedBCReceiver
problem solved.