The Intent.ACTION_BATTERY_CHANGED broadcast is what's known as a "sticky broadcast." Because this is sticky, you can register for the broadcast with a null receiver which will only get the battery level one time when you call registerReceiver.
A function to get the battery level without receiving updates would look something like this:
public float getBatteryLevel() {
Intent batteryIntent = registerReceiver(null, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
int level = batteryIntent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
int scale = batteryIntent.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
// Error checking that probably isn't needed but I added just in case.
if(level == -1 || scale == -1) {
return 50.0f;
}
return ((float)level / (float)scale) * 100.0f;
}
More data can be pulled from this sticky broadcast. Using the returned batteryIntent you can access other extras as outlined in the BatteryManager class.
