Android 获取电池电量

Step1：定义广播，接收电量信息

private int batteryLevel;
private int batteryScale;
private BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
//获取当前电量，如未获取具体数值，则默认为0
batteryLevel = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, 0);
//获取最大电量，如未获取到具体数值，则默认为100
batteryScale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, 100);
//显示电量
textViewLevel.setText((batteryLevel * 100 / batteryScale) + " % ");
}
};

Step2：注册广播

IntentFilter intentFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
//注册接收器以获取电量信息
registerReceiver(broadcastReceiver, intentFilter);