Friday, February 23, 2018

How to ensure network connectivity for an Android app on standby?

By Hường Hana 2:00 AM , Leave a Comment

I am currently writing an Android application which uses a webview and webrtc to transmit an Audio stream. The problem, at least on my mobile phone the connection is cut after a few minutes after the screen is turned off.

I already acquired a CPU lock and a wifi lock (verified with isHeld), but it does not make any difference.

The application is also available as a web application: Here it seems to work as expected and the connection stays alive.

I already checked the wifi settings: It is set to always on.

Any pointers/ideas greatly appreciated. The application is open source so I am happy to share any code, if that helps in any way. Lock grabbing is done with this:

private void grabWakeLock() {   PowerManager powerManager = (PowerManager) getSystemService(POWER_SERVICE);   wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,                                                "MyWakelockTag");   wakeLock.acquire();   WifiManager wifiManager = (WifiManager) getSystemService(WIFI_SERVICE);   wifiLock = wifiManager.createWifiLock(WifiManager.WIFI_MODE_FULL_HIGH_PERF, "gonimo-wifi-lock");   wifiLock.acquire(); }

I have the following permissions in my Manifest:

    <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />     <uses-permission android:name="android.permission.CAMERA" />     <uses-permission android:name="android.permission.WAKE_LOCK" />     <uses-permission android:name="android.permission.RECORD_AUDIO" />     <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />     <uses-feature android:name="android.hardware.camera.autofocus" />     <uses-feature android:name="android.hardware.camera" />

Many thanks in advance!

Update:

Android Doze seems to be the reason for this behaviour. Manually triggering Doze, results in the same behaviour. Also 

    return pm.isIgnoringBatteryOptimizations(packageName);

is returning false, so network will be turned off for the app! The problem: the whitelist as described in the article does not seem to exist on my phone. I can't find it in settings and doing:

    Intent intentBattery = new  Intent(Settings.ACTION_REQUEST_IGNORE_BATTERY_OPTIMIZATIONS);     intentBattery.setData(Uri.parse("package:" + "org.gonimo.gonimo"));     startActivity(intentBattery);

results in an Exception that the Activity cannot be found.

1 Answers

Answers 1

Here is an "Android, please don't kill my long running background operation" recipe

  1. Move your stream transmission code into a service running in foreground
  2. Make sure, that your app is excluded from the doze mode (because the user has to do this for you, you have to explain the reason in a nice overlay, before asking for it)

Checking:

PowerManager powerManager =      (PowerManager)getActivity().getSystemService(Activity.POWER_SERVICE);  powerManager.isIgnoringBatteryOptimizations(getActivity().getPackageName());

Asking for the white-listing:

Intent intent = new Intent(Settings.ACTION_IGNORE_BATTERY_OPTIMIZATION_SETTINGS); startActivity(intent);
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