Apparently the ACTION_BATTERY_CHANGED is a “sticky broadcast” which means you can register for it and receive it any time after it has been broadcast. To get the plugged state you can do something like: public void onCreate() { BroadcastReceiver receiver = new BroadcastReceiver() { public void onReceive(Context context, Intent intent) { int plugged = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, … Read more
I’ll assume you mean your application. In my experience, the major consumers of energy are, where #1 is most important: CPU usage 4G WiFi Bluetooth Memory Whether 4G or WiFi is worse depends upon your usage, e.g. whether you are talking with a poor signal over your cellular network or are streaming video over your … Read more
Got it! Couldn’t find anything straight in SDK but can be done using reflection. Here is the working code :- public void getBatteryCapacity() { Object mPowerProfile_ = null; final String POWER_PROFILE_CLASS = “com.android.internal.os.PowerProfile”; try { mPowerProfile_ = Class.forName(POWER_PROFILE_CLASS) .getConstructor(Context.class).newInstance(this); } catch (Exception e) { e.printStackTrace(); } try { double batteryCapacity = (Double) Class .forName(POWER_PROFILE_CLASS) .getMethod(“getAveragePower”, … Read more
This is how to get the battery level without registering a receiver: Intent batteryIntent = context.getApplicationContext().registerReceiver(null, new IntentFilter(Intent.ACTION_BATTERY_CHANGED)); int rawlevel = batteryIntent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1); double scale = batteryIntent.getIntExtra(BatteryManager.EXTRA_SCALE, -1); double level = -1; if (rawlevel >= 0 && scale > 0) { level = rawlevel / scale; } It can use a null BroadcastReceiver because of … Read more
You could just look at the source code for the Current Widget. It has hard coded path’s to where certain platforms store the current values. /* * Copyright (c) 2010-2011 Ran Manor * * This file is part of CurrentWidget. * * CurrentWidget is free software: you can redistribute it and/or modify * it under … Read more
I have solved this problem. public class BluetoothLeService extends Service { private static final UUID Battery_Service_UUID = UUID.fromString(“0000180F-0000-1000-8000-00805f9b34fb”); private static final UUID Battery_Level_UUID = UUID.fromString(“00002a19-0000-1000-8000-00805f9b34fb”); public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) { if(status == BluetoothGatt.GATT_SUCCESS) { broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic); } } private void broadcastUpdate(final String action, final BluetoothGattCharacteristic characteristic) { final Intent intent = … Read more
If you’re looking for a quick way to query it from the command line, you’ll find the pmset command helpful. To query the battery status, specifically, use: $ pmset -g batt
The API allows you to register to receive notifications for changes to the battery level. It only reports a change at 5% increments up or down, but you can use a timer and measure the time between two changes (or initial battery level and first change). Here’s how you register for the notifications: // Use … Read more
Here is a code sample that explains how to get battery information. To sum it up, a broadcast receiver for the ACTION_BATTERY_CHANGED intent is set up dynamically, because it can not be received through components declared in manifests, only by explicitly registering for it with Context.registerReceiver(). public class Main extends Activity { private TextView batteryTxt; … Read more