Is battery Power Low - Android android.os

Android examples for android.os:Battery

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Description

Is battery Power Low

Demo Code

import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.BatteryManager;

public class Main {

  public static boolean batteryPowerIsLow(Context context) {

    if (context == null)
      throw new NullPointerException("context cannot be null");

    final int PowerSaveThreshold = 20;

    int batteryLevel = getCurrentBatteryChargePercentage(context);

    return (batteryLevel <= PowerSaveThreshold) ? true : false;
  }/*from   w  w w . j a va2  s . co  m*/

  public static int getCurrentBatteryChargePercentage(Context context) {
    IntentFilter iFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
    Intent batteryStatus = context.registerReceiver(null, iFilter);

    final int DefaultValue = 0;

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

    int batteryPct = calculateBatteryPercentage(level, scale);

    return batteryPct;
  }
  private static int calculateBatteryPercentage(int level, int scale) {
    return Math.round((level / (float) scale) * 100);
}
}

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