安卓系统中实现摇一摇画面振动效果的方法

 public interface SensorEventListener { 
   
    /** 
     * Called when sensor values have changed. 
     * <p>See {@link android.hardware.SensorManager SensorManager} 
     * for details on possible sensor types. 
     * <p>See also {@link android.hardware.SensorEvent SensorEvent}. 
     * 
     * <p><b>NOTE:</b> The application doesn't own the 
     * {@link android.hardware.SensorEvent event} 
     * object passed as a parameter and therefore cannot hold on to it. 
     * The object may be part of an internal pool and may be reused by 
     * the framework. 
     * 
     * @param event the {@link android.hardware.SensorEvent SensorEvent}. 
     */ 
    public void onSensorChanged(SensorEvent event); 
   
    /** 
     * Called when the accuracy of a sensor has changed. 
     * <p>See {@link android.hardware.SensorManager SensorManager} 
     * for details. 
     * 
     * @param accuracy The new accuracy of this sensor 
     */ 
    public void onAccuracyChanged(Sensor sensor, int accuracy);   
  } 

 import android.app.Activity; 
  import android.app.Service; 
  import android.os.Vibrator; 
   
  public class VibratorHelper { 
    public static void Vibrate(final Activity activity, long milliseconds) { 
      Vibrator vibrator = (Vibrator) activity 
          .getSystemService(Service.VIBRATOR_SERVICE); 
      vibrator.vibrate(milliseconds); 
    } 
   
    public static void Vibrate(final Activity activity, long[] pattern, 
        boolean isRepeat) { 
      Vibrator vibrator = (Vibrator) activity 
          .getSystemService(Service.VIBRATOR_SERVICE); 
      vibrator.vibrate(pattern, isRepeat ? 1 : -1); 
    } 
  } 

  <uses-permission android:name="android.permission.VIBRATE"/> 

 import android.app.Activity; 
  import android.app.AlertDialog; 
  import android.content.Context; 
  import android.content.DialogInterface; 
  import android.content.DialogInterface.OnClickListener; 
  import android.hardware.Sensor; 
  import android.hardware.SensorEvent; 
  import android.hardware.SensorEventListener; 
  import android.hardware.SensorManager; 
  import android.os.Bundle; 
  import android.util.Log; 
  import android.widget.Toast; 
   
  public class MainActivity extends Activity { 
    private SensorManager sensorManager; 
    private SensorEventListener shakeListener; 
    private AlertDialog.Builder dialogBuilder; 
   
    private boolean isRefresh = false; 
   
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.activity_main); 
   
      sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE); 
      shakeListener = new ShakeSensorListener(); 
   
      dialogBuilder = new AlertDialog.Builder(this); 
      dialogBuilder.setPositiveButton("确定", new OnClickListener() { 
   
        @Override 
        public void onClick(DialogInterface dialog, int which) { 
          isRefresh = false; 
          dialog.cancel(); 
        } 
      }).setMessage("摇到了一个漂亮妹子！").create(); 
    } 
   
    @Override 
    protected void onResume() { 
      sensorManager.registerListener(shakeListener, 
          sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), 
          SensorManager.SENSOR_DELAY_FASTEST); 
      super.onResume(); 
    } 
   
    @Override 
    protected void onPause() { 
      // acitivity后台时取消监听 
      sensorManager.unregisterListener(shakeListener); 
   
      super.onPause(); 
    } 
   
    private class ShakeSensorListener implements SensorEventListener { 
      private static final int ACCELERATE_VALUE = 20; 
   
      @Override 
      public void onSensorChanged(SensorEvent event) { 
   
  //     Log.e("zhengyi.wzy", "type is :" + event.sensor.getType()); 
   
        // 判断是否处于刷新状态(例如微信中的查找附近人) 
        if (isRefresh) { 
          return; 
        } 
   
        float[] values = event.values; 
   
        /** 
         * 一般在这三个方向的重力加速度达到20就达到了摇晃手机的状态 x : x轴方向的重力加速度，向右为正 y : 
         * y轴方向的重力加速度，向前为正 z : z轴方向的重力加速度，向上为正 
         */ 
        float x = Math.abs(values[0]); 
        float y = Math.abs(values[1]); 
        float z = Math.abs(values[2]); 
   
        Log.e("zhengyi.wzy", "x is :" + x + " y is :" + y + " z is :" + z); 
         
        if (x >= ACCELERATE_VALUE || y >= ACCELERATE_VALUE 
            || z >= ACCELERATE_VALUE) { 
          Toast.makeText( 
              MainActivity.this, 
              "accelerate speed :" 
                  + (x >= ACCELERATE_VALUE ? x 
                      : y >= ACCELERATE_VALUE ? y : z), 
              Toast.LENGTH_SHORT).show(); 
   
          VibratorHelper.Vibrate(MainActivity.this, 300); 
          isRefresh = true; 
          dialogBuilder.show(); 
        } 
   
      } 
   
      @Override 
      public void onAccuracyChanged(Sensor sensor, int accuracy) { 
        // TODO Auto-generated method stub 
      } 
   
    } 
   
  }