Android 对电池状态的监视

    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！