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册监听器,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，在准备完成的回调函数中启动播放器 mPlayer.start(); } @Override public void onAccuracyChanged(Sensor sensor, int accuracy) { } }}