最近在开发一个与GPS相关的项目，因为其中涉及到了GPS的使用，众所周知，GPS是相当耗电的，因此就想着怎么能知道当前的电量，并且在电量达到一个下限的时候，及时提醒给用户，以根据情况关闭GPS，节省电量，以备电话急用，后来查资料，看API，终于找到了方法，怎么来监视电量，根据电量的变化来获取当前的电量多少，并且根据其它状态综合对手机进行管理，以达到管理最优的状态。

下面是代码：

private BroadcastReceiver mBatInfoReceiver = new BroadcastReceiver() {
	int intLevel = 0;
	int intScale = 0;
	public void onReceive(Context context, Intent intent) {
		String action = intent.getAction();
		/*
		* 如果捕捉到的action是ACTION_BATTERY_CHANGED， 就运行onBatteryInfoReceiver()
		*/
		if (Intent.ACTION_BATTERY_CHANGED.equals(action)) {
			intLevel = intent.getIntExtra("level", 0);
			intScale = intent.getIntExtra("scale", 100);
			// 电池伏数
			Log.d("Battery V", "" + intent.getIntExtra("voltage", 0));
			// 电池温度
			Log.d("Battery T", "" + intent.getIntExtra("temperature", 0));
			BatteryV = "当前电压为：" + intent.getIntExtra("voltage", 0);
			BatteryT = "当前温度为：" + intent.getIntExtra("temperature", 0);
			switch (intent.getIntExtra("status",
							BatteryManager.BATTERY_STATUS_UNKNOWN)) {
							case BatteryManager.BATTERY_STATUS_CHARGING:
				BatteryStatus = "充电状态";
				break;
				case BatteryManager.BATTERY_STATUS_DISCHARGING:
				BatteryStatus = "放电状态";
				break;
				case BatteryManager.BATTERY_STATUS_NOT_CHARGING:
				BatteryStatus = "未充电";
				break;
				case BatteryManager.BATTERY_STATUS_FULL:
				BatteryStatus = "充满电";
				break;
				case BatteryManager.BATTERY_STATUS_UNKNOWN:
				BatteryStatus = "未知道状态";
				break;
			}
			switch (intent.getIntExtra("plugged",
							BatteryManager.BATTERY_PLUGGED_AC)) {
				case BatteryManager.BATTERY_PLUGGED_AC:
				BatteryStatus2 = "AC充电";
				break;
				case BatteryManager.BATTERY_PLUGGED_USB:
				BatteryStatus2 = "USB充电";
				break;
			}
			switch (intent.getIntExtra("health",
							BatteryManager.BATTERY_HEALTH_UNKNOWN)) {
				case BatteryManager.BATTERY_HEALTH_UNKNOWN:
				BatteryTemp = "未知错误";
				break;
				case BatteryManager.BATTERY_HEALTH_GOOD:
				BatteryTemp = "状态良好";
				break;
				case BatteryManager.BATTERY_HEALTH_DEAD:
				BatteryTemp = "电池没有电";
				break;
				case BatteryManager.BATTERY_HEALTH_OVER_VOLTAGE:
				BatteryTemp = "电池电压过高";
				break;
				case BatteryManager.BATTERY_HEALTH_OVERHEAT:
				BatteryTemp =  "电池过热";
				break;
			}
		}
	}
};

这些信息就是监听广播，根据广播的信息进行判断，如果是电量变化的广播，那么就根据这些信息，更新数据，从而进行分析！

(责编：dalishu)