获取系统电量

在android获取系统电量可以通过接收系统电量改变广播在实现

1.创建电量改变广播接收者

    /**  * 电量改变广播接收者,获取系统电量  */  class BatteryReceiver extends BroadcastReceiver {        @Override        public void onReceive(Context context, Intent intent) {            //判断它是否是为电量变化的Broadcast Action            if (Intent.ACTION_BATTERY_CHANGED.equals(intent.getAction())) {                //获取当前电量                int level = intent.getIntExtra("level", 0);                //电量的总刻度                int scale = intent.getIntExtra("scale", 100);                //把它转成百分比//                Log.e("399","电池电量为" + ((level * 100) / scale) + "%");//                Log.e("399","level" +level + " scale" + scale);                mBatteryTextView.setText(((level * 100) / scale) + "%");            }        }    }

2代码注册广播接收者

mBroadcastReceiver = new BatteryReceiver();IntentFilter intentFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);registerReceiver(mBroadcastReceiver, intentFilter);

3.在destory()方法中注销广播接收者

@Overrideprotected void onDestroy() {    super.onDestroy();    if(mBroadcastReceiver != null){        unregisterReceiver(mBroadcastReceiver);    }}

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