Android 获取设备电池电量

homeFilter = new IntentFilter();
homeFilter.addAction(Intent.ACTION_BATTERY_CHANGED);
registerReceiver(homeReceiver, homeFilter);

private BroadcastReceiver homeReceiver = new BroadcastReceiver() {

@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (Intent.ACTION_BATTERY_CHANGED.equals(action)) {
int rawLevel = intent.getIntExtra("level", -1);
int scale = intent.getIntExtra("scale", -1);
int status = intent.getIntExtra("status", -1);
int health = intent.getIntExtra("health", -1);
MyLog.i("[HomeReceiver]rawLevel:" + rawLevel + ",scale:"
+ scale + ",status:" + status + ",health:" + health);

switch (status) {
case BatteryManager.BATTERY_STATUS_UNKNOWN:
setBatteryImageByLevel(0);
break;

case BatteryManager.BATTERY_STATUS_CHARGING:
break;

case BatteryManager.BATTERY_STATUS_DISCHARGING:
case BatteryManager.BATTERY_STATUS_NOT_CHARGING:
if (rawLevel >= 0 && rawLevel <= 100) {
int level = (int) (rawLevel / 10.0);
setBatteryImageByLevel(level);
}
break;

case BatteryManager.BATTERY_STATUS_FULL:
setBatteryImageByLevel(10);
break;

default:
break;
}

}
}
};

/**
* 设置电池图标
*
* @param level
*            0-10
*/
private void setBatteryImageByLevel(int level) {
MyLog.i("[setBatteryImageByLevel]:" + level);
if (level >= 0 && level <= 10) {
int batteryResId = getResources().getIdentifier(
"home_battery_" + level, "drawable", getPackageName());
imageBattery.setImageResource(batteryResId);
}
}