Change image on battery level Android

Question

my application show the battery level.. I have three batteries images; One gree, one yellow and another one red. I want place in a imageview these images when battery level change.. For example: when the battery is 100% there will be the green battery, when 50% the yellow and 20% red. How can i do it? For now i have a static image in a listview simply like this:

            <ImageView
                android:id="@+id/BatteryInfoimage"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:contentDescription="image"
                android:adjustViewBounds="true"
                android:src="@drawable/battery"
            />

Thanks

Answer 1

you can get the battery level using BatteryManager. see the doc here

int level = batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
int scale = batteryStatus.getIntExtra(BatteryManager.EXTRA_SCALE, -1);

float batteryPct = level / (float)scale;

Now from the code depending of the batterPct set the specific image

And to Monitor the change use the following

Declare a BroadCastReceiver

<receiver android:name=".PowerConnectionReceiver">
  <intent-filter>
    <action android:name="android.intent.action.ACTION_POWER_CONNECTED"/>
    <action android:name="android.intent.action.ACTION_POWER_DISCONNECTED"/>
  </intent-filter>
</receiver>

Within the associated BroadcastReceiver implementation, you can extract the current charging state and method as described in the previous step.

public class PowerConnectionReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) { 
        int status = intent.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
        boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING ||
                            status == BatteryManager.BATTERY_STATUS_FULL;

        int chargePlug = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
        boolean usbCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_USB;
        boolean acCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_AC;
    }
}