Android BatteryManager only returns 1
I am trying to read the android battery status when an alarm repeater is triggered. I have the following setup:
public class RepeatingAlarm extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent)
{
// Acquire the make of the device
final String PhoneModel = android.os.Build.MODEL;
final String AndroidVersion = android.os.Build.VERSION.RELEASE;
// Grab the battery information
int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
int scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
final float batteryPct = level / (float)scale;
}
}
But I don't understand why it is returning this batteryPct = 1
. Is there something I am missing here? I added the correct permissions based on the Google Android page, but it didn't seem to help.
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You get -1
for level
and scale
. This is because you might be trying to broadcast ACTION_BATTERY_CHANGED
in the manifest.
ACTION_BATTERY_CHANGED
is a sticky intent and you cannot register it in the manifest. Try the following
Intent i = new ContextWrapper(applicationContext).registerReceiver(null, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
// now you can get the level and scale from this intent variable
int level = i.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
int scale = i.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
float battPct = level/(float)scale;
You would not want to use the device for this intent, just use the above method regardless of whether you want to use it.
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You can get -1 for both variables level
and scale
(the default value you specify), so try printing their values to make sure you intent
have those values correctly.
You must listen ACTION_BATTERY_CHANGED
to the battery level in Android
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