Android Development: Show Battery Level

Question

I've been searching for this and only find really messed up things. Isn't there a easy way to show the battery level like 21% on a toast or Textview? Or how can i achieve this?

//Simon

Solution 1

if you mean changing the battery status on the emulator do the following. Connect to the emulator via telnet and change the status and capacity

> telnet localhost 5554
Android Console: type 'help' for a list of commands
OK
power ac off
OK
power discharging
OK
power capacity 21
OK
exit
>

Ahh, well you can do what it says on the page Ted mentioned, and then use a handler to show a toast. This is the code you need to add to your activity.

private Handler handler = new Handler;

private BroadcastReceiver mBatInfoReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(final Context context, Intent intent) {
        int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, 0);
        int scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, 100);
        Log.i(TAG, "level: " + level + "; scale: " + scale);
        int percent = (level*100)/scale;

        final String text = String.valueOf(percent) + "%";
        handler.post( new Runnable() {

            public void run() {
                Toast.makeText(context, text, Toast.LENGTH_SHORT).show();
            }
        });

    }
};

Solution 2

To get the battery level right now, call:

registerReceiver(null, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));

(note: typing that in from memory, please adjust if needed)

This will return an Intent with various extras documented on the BatteryManager class. Use BatteryManager.EXTRA_LEVEL and BatteryManager.EXTRA_SCALE to determine the percentage remaining.

If you need to know over a period of time as the battery changes, use the BroadcastReceiver approach @Augusto outlined in his answer.

Solution 3

    public static String batteryLevel(Context context)
    {
        Intent intent  = context.registerReceiver(null, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));   
        int    level   = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, 0);
        int    scale   = intent.getIntExtra(BatteryManager.EXTRA_SCALE, 100);
        int    percent = (level*100)/scale;
        return String.valueOf(percent) + "%";
    }

Comments

[carefacerz]

Sorry, i mean like BatteyManager.getLevel() but there isnt. so basicly just show how much battery procentage i have on my phone

[CommonsWare]

@Augusto: Ideally, use BatteryManager.EXTRA_LEVEL instead of "level". Also, the level is not a percentage. It is a value ranging from 0 to the value of the BatteryManager.EXTRA_SCALE extra. On many devices, the scale is 100, but do not assume that.

[Victor]

Don't forget to register the receiver: this.registerReceiver(this.mBatInfoReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED)); :)