1、创建BroadcastReceiver对象，重写onReceive（）方法首先获取Action事件，当判断该事件为Intent.ACTION_BATTERY_CHANGED时，获取手机当前电量和总电量
BroadcastReceiver br=new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { // TODO Auto-generated method stub String s=intent.getAction(); if(Intent.ACTION_BATTERY_CHANGED.equals(s)){ level=intent.getIntExtra("level", 0); scale=intent.getIntExtra("scale", 100); hd.sendEmptyMessage(0); Toast.makeText(MainActivity.this, "当前电量为："+level*100/scale+"%", Toast.LENGTH_SHORT).show(); } } };
2、创建Handler对象，重写handleMessage（）方法，捕捉信息编号为0的消息，更改TextView的内容
Handler hd=new Handler(){ public void handleMessage(Message msg){ switch (msg.what) { case 0: TextView tv=(TextView)MainActivity.this.findViewById(R.id.TextView02); tv.setText(level*100/scale+"%");; break;
default: break; } } };
3、在Button的点击事件中注册访问电池剩余量的系统BroadcastReceiver
registerReceiver(br, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
转载于:https://www.cnblogs.com/wdc224/p/3656996.html
