Android面试之——摇一摇

package com.xs.test;

import android.app.Activity;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.os.Vibrator;
import android.util.Log;
import android.widget.Toast;

/**
 * 安卓晃动手机监听--“摇一摇”
 * 
 * @author 单红宇
 * 
 */
public class TestSensorActivity extends Activity {

	private SensorManager sensorManager;
	private Vibrator vibrator;

	private static final String TAG = "TestSensorActivity";
	private static final int SENSOR_SHAKE = 10;

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
		vibrator = (Vibrator) getSystemService(VIBRATOR_SERVICE);
	}

	@Override
	protected void onResume() {
		super.onResume();
		if (sensorManager != null) {// 注册监听器
			sensorManager.registerListener(sensorEventListener, sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL);
			// 第一个参数是Listener，第二个参数是所得传感器类型，第三个参数值获取传感器信息的频率
		}
	}

	@Override
	protected void onPause() {
		super.onPause();
		if (sensorManager != null) {// 取消监听器
			sensorManager.unregisterListener(sensorEventListener);
		}
	}

	/**
	 * 重力感应监听
	 */
	private SensorEventListener sensorEventListener = new SensorEventListener() {

		@Override
		public void onSensorChanged(SensorEvent event) {
			// 传感器信息改变时执行该方法
			float[] values = event.values;
			float x = values[0]; // x轴方向的重力加速度，向右为正
			float y = values[1]; // y轴方向的重力加速度，向前为正
			float z = values[2]; // z轴方向的重力加速度，向上为正
			Log.i(TAG, "x轴方向的重力加速度" + x +  "；y轴方向的重力加速度" + y +  "；z轴方向的重力加速度" + z);
			// 一般在这三个方向的重力加速度达到40就达到了摇晃手机的状态。
			int medumValue = 19;// 三星 i9250怎么晃都不会超过20，没办法，只设置19了
			if (Math.abs(x) > medumValue || Math.abs(y) > medumValue || Math.abs(z) > medumValue) {
				vibrator.vibrate(200);
				Message msg = new Message();
				msg.what = SENSOR_SHAKE;
				handler.sendMessage(msg);
			}
		}

		@Override
		public void onAccuracyChanged(Sensor sensor, int accuracy) {

		}
	};

	/**
	 * 动作执行
	 */
	Handler handler = new Handler() {

		@Override
		public void handleMessage(Message msg) {
			super.handleMessage(msg);
			switch (msg.what) {
			case SENSOR_SHAKE:
				Toast.makeText(TestSensorActivity.this, "检测到摇晃，执行操作！", Toast.LENGTH_SHORT).show();
				Log.i(TAG, "检测到摇晃，执行操作！");
				break;
			}
		}

	};
}