Android_通过传感器抓小偷

package com.beyond.phonestolen;

import android.hardware.Sensor;

import android.hardware.SensorEvent;

import android.hardware.SensorEventListener;

import android.hardware.SensorManager;

import android.media.AudioManager;

import android.media.MediaPlayer;

import android.os.Bundle;

import android.app.Activity;

import android.widget.Toast;

public class MainActivity extends Activity {

	//传感器管理器

	private SensorManager sm;

	//距离传感器

	private Sensor sensor;

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.activity_main);

		//1,通过获取系统服务，得到传感器管理器

		sm=(SensorManager) getSystemService(SENSOR_SERVICE);

		//2,通过传感器管理器获取指定的距离传感器

		sensor=sm.getDefaultSensor(Sensor.TYPE_PROXIMITY);

		//3,通过传感器管理器注冊监听器,监听距离传感器的感应事件

		sm.registerListener(new MyListener(), sensor, SensorManager.SENSOR_DELAY_GAME);

	}

	private class MyListener implements SensorEventListener{

		@Override

		public void onSensorChanged(SensorEvent event) {

			float distance=event.values[0];

			//System.out.println(val[0]);

			Toast.makeText(MainActivity.this, ""+distance, 0).show();

			//当手机在裤袋里面时，距离为0

			if (distance<1.0f) {

				return;

			}

			//当手机脱离裤袋的时候，距离为1，播放音乐

			playMusic();

		}

		private void playMusic() {

			// 播放音乐

			MediaPlayer mPlayer=MediaPlayer.create(MainActivity.this, R.drawable.alarm);

			mPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);

			try {

				mPlayer.prepare();

			} catch (Exception e) {

				e.printStackTrace();

			}

			//理论上应该异步准备，在准备完毕的回调函数中启动播放器

			mPlayer.start();

		}

		@Override

		public void onAccuracyChanged(Sensor sensor, int accuracy) {

		}

	}

}