Android 對電池狀態的監視

    最近在開發一個與GPS相關的項目，因為其中涉及到了GPS的使用，眾所周知，GPS是相當耗電的，因此就想著怎麼能知道當前的電量，並且在電量達到一個下限的時候，及時提醒給用戶，以根據情況關閉GPS，節省電量，以備電話急用，後來查資料，看API，終於找到了方法，怎麼來監視電量，根據電量的變化來獲取當前的電量多少，並且根據其它狀態綜合對手機進行管理，以達到管理最優的狀態。

    下面是代碼：

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， 就運行onBatteryInfoReceiver()
             */
            if (Intent.ACTION_BATTERY_CHANGED.equals(action)) {
                intLevel = intent.getIntExtra("level", 0);
                intScale = intent.getIntExtra("scale", 100);

                // 電池伏數
                Log.d("Battery V", "" + intent.getIntExtra("voltage", 0));
                // 電池溫度
                Log.d("Battery T", "" + intent.getIntExtra("temperature", 0));
                BatteryV = "當前電壓為：" + intent.getIntExtra("voltage", 0);
                BatteryT = "當前溫度為：" + intent.getIntExtra("temperature", 0);

                switch (intent.getIntExtra("status",
                        BatteryManager.BATTERY_STATUS_UNKNOWN)) {
                case BatteryManager.BATTERY_STATUS_CHARGING:
                    BatteryStatus = "充電狀態";
                    break;
                case BatteryManager.BATTERY_STATUS_DISCHARGING:
                    BatteryStatus = "放電狀態";
                    break;
                case BatteryManager.BATTERY_STATUS_NOT_CHARGING:
                    BatteryStatus = "未充電";
                    break;
                case BatteryManager.BATTERY_STATUS_FULL:
                    BatteryStatus = "充滿電";
                    break;
                case BatteryManager.BATTERY_STATUS_UNKNOWN:
                    BatteryStatus = "未知道狀態";
                    break;
                }
                switch (intent.getIntExtra("plugged",
                        BatteryManager.BATTERY_PLUGGED_AC)) {
                case BatteryManager.BATTERY_PLUGGED_AC:
                    BatteryStatus2 = "AC充電";
                    break;
                case BatteryManager.BATTERY_PLUGGED_USB:
                    BatteryStatus2 = "USB充電";
                    break;
                }

                switch (intent.getIntExtra("health",
                        BatteryManager.BATTERY_HEALTH_UNKNOWN)) {
                case BatteryManager.BATTERY_HEALTH_UNKNOWN:
                    BatteryTemp = "未知錯誤";
                    break;
                case BatteryManager.BATTERY_HEALTH_GOOD:
                    BatteryTemp = "狀態良好";
                    break;
                case BatteryManager.BATTERY_HEALTH_DEAD:
                    BatteryTemp = "電池沒有電";
                    break;
                case BatteryManager.BATTERY_HEALTH_OVER_VOLTAGE:
                    BatteryTemp = "電池電壓過高";
                    break;
                case BatteryManager.BATTERY_HEALTH_OVERHEAT:
                    BatteryTemp =  "電池過熱";
                    break;
                }

            }
        }

    };

這些信息就是監聽廣播，根據廣播的信息進行判斷，如果是電量變化的廣播，那麼就根據這些信息，更新數據，從而進行分析！