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();
	}