sensorListener研究

/*声明变量*/
	  private TextView mTextView01; 
	  private ImageView mImageView01;
	  private SensorManager mSensorManager01;  
	  private float velocityFinal = 0; 
	  /*声明媒体播放器*/
	  private MediaPlayer mMediaPlayer01; 
	  private MediaPlayer mMediaPlayer02;
	  private MediaPlayer mMediaPlayer03;
	  private Date lastUpdateTime; 
	  private boolean bIfMakeSound = true; 
	  private int godanswer = 0;
	  /*声明常数*/
	  private final int saint=1;
	  private final int laugh=2;
	  private final int bad=3;
	   
	  /** Called when the activity is first created. */ 
	  @Override 
	  public void onCreate(Bundle savedInstanceState) 
	  { 
	    super.onCreate(savedInstanceState); 
	    setContentView(R.layout.main); 
	    /*取得目前系统时间*/ 
	    lastUpdateTime = new Date(System.currentTimeMillis()); 
	    /*通过findViewById构造器创建TextView与ImageView对象*/
	    mTextView01 = (TextView)findViewById(R.id.myTextView1);
	    mImageView01 = (ImageView)findViewById(R.id.myImageView1);
	    /*取得系统的加速度感测装备*/ 
	    mSensorManager01 =  
	    (SensorManager)getSystemService(Context.SENSOR_SERVICE); 
	    /*通过MediaPlayer.create()来取得raw底下音乐文件*/
	    mMediaPlayer01 = new MediaPlayer(); 
	    mMediaPlayer01 = MediaPlayer.create(SensorManager1.this, R.raw.saint); 
	    mMediaPlayer02 = new MediaPlayer(); 
	    mMediaPlayer02 = MediaPlayer.create(SensorManager1.this, R.raw.laugh); 
	    mMediaPlayer03 = new MediaPlayer(); 
	    mMediaPlayer03 = MediaPlayer.create(SensorManager1.this, R.raw.bad); 
	  } 

	  /*覆盖onResuem方法*/
	  @Override 
	  protected void onResume() 
	  { 
	    // TODO Auto-generated method stub 
	    /*注册SensorListener与设置参数*/
	    mSensorManager01.registerListener 
	    ( 
	      mSensorLisener, 
	      SensorManager.SENSOR_ACCELEROMETER, 
	      SensorManager.SENSOR_DELAY_UI 
	    ); 
	    super.onResume(); 
	  } 
	   /*覆盖onPause方法*/
	  @Override 
	  protected void onPause() 
	  { 
	    /*解除SensorListener的设置*/
	    // TODO Auto-generated method stub 
	    mSensorManager01.unregisterListener(mSensorLisener); 
	    super.onPause(); 
	  }   
	  
	   /*创建SensorListener对象*/
	  private final SensorListener mSensorLisener = new SensorListener()
	  { 
	    /*声明变量*/
	    private float previousAcceleration; 
	    /*覆盖onSensorChanged事件来侦测手机投掷事件*/
	 
	    public void onSensorChanged(int sensor, float[] values) 
	    { 
	      // TODO Auto-generated method stub 
	      /*加速度是否存在*/
	      if(sensor == SensorManager.SENSOR_ACCELEROMETER) 
	      { 
	        float x = values[SensorManager.DATA_X]; 
	        float y = values[SensorManager.DATA_Y]; 
	        float z = values[SensorManager.DATA_Z]; 
	         /*手机是否落下的速度标准*/
	        double forceThreshHold = 1.5f;        
	        double appliedAcceleration = 0.0f; 
	         
	        /* SensorManager.GRAVITY_EARTH = 9.8m/s2 */ 
	        appliedAcceleration +=  
	        Math.pow(x/SensorManager.GRAVITY_EARTH, 2.0);  
	         
	        appliedAcceleration +=  
	        Math.pow(y/SensorManager.GRAVITY_EARTH, 2.0);  
	         
	        appliedAcceleration +=  
	        Math.pow(z/SensorManager.GRAVITY_EARTH, 2.0);  
	         
	        appliedAcceleration = Math.sqrt(appliedAcceleration);  
	          
	        /*判断手机使否落下的判断式
	         * 落地当时速度需小于1.5f, 落地前速度必须大于1.5f*/
	        if((appliedAcceleration < forceThreshHold) &&  
	           (previousAcceleration > forceThreshHold)) 
	        { 
	          /* Shake手机事件触发 */ 
	          Date timeNow = new Date(System.currentTimeMillis()); 
	           
	          /* 从初速度到末速度所经过的时间 */ 
	          long timePeriod =  
	          (long)timeNow.getTime() - (long)lastUpdateTime.getTime(); 
	           
	          /* (v) = a*t */ 
	          velocityFinal =  
	          (float) (appliedAcceleration * ((float)timePeriod/1000)); 
	          Log.i("V=",Float.toString(velocityFinal));

	          if(bIfMakeSound==true) 
	          { 
	            /*Random Number生成器*/
	            Random generator=new Random();
	            /*掷筊*/
	            godanswer = generator.nextInt(3) + 1;
	            
	            switch (godanswer)
	            {
	             /*圣筊*/
	            case saint:
	              mTextView01.setText 
	              ( 
	                getResources().getText(R.string.str_saint).toString() 
	              ); 
	              mImageView01.setImageDrawable(getResources().
	              getDrawable(R.drawable.saint));
	              if (mMediaPlayer01 != null) 
	              { 
	                try 
	                { 
	                  mMediaPlayer01.seekTo(0); 
	                  mMediaPlayer01.stop(); 
	                  mMediaPlayer01.prepare(); 
	                  mMediaPlayer01.setVolume(10, 10);
	                  mMediaPlayer01.start(); 
	                } 
	                catch(Exception e) 
	                { 
	                  mTextView01.setText(e.toString()); 
	                  e.printStackTrace(); 
	                } 
	              } 
	              else 
	              { 
	                try 
	                { 
	                  mMediaPlayer01.prepare(); 
	                  mMediaPlayer01.setVolume(10, 10);
	                  mMediaPlayer01.start(); 
	                } 
	                catch(Exception e) 
	                { 
	                  mTextView01.setText(e.toString()); 
	                  e.printStackTrace(); 
	                } 
	              }
	              break;
	            /*笑筊*/
	            case laugh:
	              mTextView01.setText 
	              ( 
	                getResources().getText(R.string.str_laugh).toString() 
	              ); 
	              mImageView01.setImageDrawable(getResources().
	              getDrawable(R.drawable.laugh));
	              if (mMediaPlayer02 != null) 
	              { 
	                try 
	                { 
	                  mMediaPlayer02.seekTo(0); 
	                  mMediaPlayer02.stop(); 
	                  mMediaPlayer02.prepare(); 
	                  mMediaPlayer02.setVolume(10, 10);
	                  mMediaPlayer02.start(); 
	                } 
	                catch(Exception e) 
	                { 
	                  mTextView01.setText(e.toString()); 
	                  e.printStackTrace(); 
	                } 
	              } 
	              else 
	              { 
	                try 
	                { 
	                  mMediaPlayer02.prepare(); 
	                  mMediaPlayer02.setVolume(10, 10);
	                  mMediaPlayer02.start(); 
	                } 
	                catch(Exception e) 
	                { 
	                  mTextView01.setText(e.toString()); 
	                  e.printStackTrace(); 
	                } 
	              }
	              break;
	              /*阴筊*/
	            case bad:
	              mTextView01.setText 
	              ( 
	                getResources().getText(R.string.str_bad).toString() 
	              ); 
	              mImageView01.setImageDrawable(getResources().
	              getDrawable(R.drawable.bad));
	              if (mMediaPlayer03 != null) 
	              { 
	                try 
	                { 
	                  mMediaPlayer03.seekTo(0); 
	                  mMediaPlayer03.stop(); 
	                  mMediaPlayer03.prepare(); 
	                  mMediaPlayer03.setVolume(10, 10);
	                  mMediaPlayer03.start(); 
	                } 
	                catch(Exception e) 
	                { 
	                  mTextView01.setText(e.toString()); 
	                  e.printStackTrace(); 
	                } 
	              } 
	              else 
	              { 
	                try 
	                { 
	                  mMediaPlayer03.prepare(); 
	                  mMediaPlayer03.setVolume(10, 10);
	                  mMediaPlayer03.start(); 
	                } 
	                catch(Exception e) 
	                { 
	                  mTextView01.setText(e.toString()); 
	                  e.printStackTrace(); 
	                } 
	              }
	              break;
	            }
	          }
	        }
	        else 
	        { 
	          /* 末速度=0 */ 
	          /* 更新lastUpdateTime为现在 */ 
	          Date timeNow = new Date(System.currentTimeMillis()); 
	          lastUpdateTime.setTime(timeNow.getTime()); 
	        } 
	        previousAcceleration = (float) appliedAcceleration; 
	      } 
	    } 
	     

	    public void onAccuracyChanged(int sensor, int accuracy) 
	    { 
	      // TODO Auto-generated method stub    
	    }     
	  }; 
	}