查看Battery剩余电量

?

private int intLevel;private int intScale;private Button mButton01;private AlertDialog d;private BroadcastReceiver mBatInfoReceiver = new BroadcastReceiver() {public void onReceive(Context context, Intent intent) {String action = intent.getAction();/* * 如果捕捉到的action是ACTION_BATTERY_CHANGED， 就执行onBatteryInfoReceiver() */if (Intent.ACTION_BATTERY_CHANGED.equals(action)) {intLevel = intent.getIntExtra("level", 0);intScale = intent.getIntExtra("scale", 100);onBatteryInfoReceiver(intLevel, intScale);}}};public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.my_battery);/* 初始化Button，并设定按下后的操作 */mButton01 = (Button) findViewById(R.id.myButton1);mButton01.setOnClickListener(new Button.OnClickListener() {public void onClick(View v) {/* 注册几个系统 BroadcastReceiver，作为访问电池计量之用 */registerReceiver(mBatInfoReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));}});}/* 拦截到ACTION_BATTERY_CHANGED时要执行的method */public void onBatteryInfoReceiver(int intLevel, int intScale) {/* create 弹出的对话窗口 */d = new AlertDialog.Builder(MyBattery.this).create();d.setTitle("系统信息");/* 将取得的电吕计量显示于Dialog中 */d.setMessage("剩余电池量"+ String.valueOf(intLevel * 100 / intScale) + "%");/* 设定返并加画面的按钮 */d.setButton("确定",new DialogInterface.OnClickListener() {public void onClick(DialogInterface dialog, int which) {/* 反注册Receiver，并关闭对话窗口 */unregisterReceiver(mBatInfoReceiver);d.dismiss();}});d.show();}