如何获取电池状态

简单，一个广播搞定

        IntentFilter filter = new IntentFilter();
        filter.addAction(Intent.ACTION_BATTERY_CHANGED);
        context.registerReceiver(this, filter);

 public void onReceive(Context context, Intent intent) {
        final String action = intent.getAction();
        if (action.equals(Intent.ACTION_BATTERY_CHANGED)) {
            //电池电量
            final int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, 0);
            final int status = intent.getIntExtra(BatteryManager.EXTRA_STATUS,
                    BatteryManager.BATTERY_STATUS_UNKNOWN);

	    //是否正在充电
            boolean plugged = false;
            switch (status) {
                case BatteryManager.BATTERY_STATUS_CHARGING:
                case BatteryManager.BATTERY_STATUS_FULL:
                    plugged = true;
                    break;
            }

            
        }
    }