Android Open Source - Music-Share-Android Shake Detector

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License

The source code is released under:

GNU General Public License

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Java Source Code

package com.paperairplane.music.share.utils;
/*  w  w  w  .  j  av  a 2s  .c  o  m*/
import java.util.ArrayList;

import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;

/**
 * ????????
 * 
 * @author ????
 * @see <a href="http://blog.csdn.net/zhengzhiren">Blog</a>
 */
// P.S.???????????????????????==
//?????????
public class ShakeDetector implements SensorEventListener {
  /**
   * ????????????
   */
  private static ShakeDetector INSTANCE;
  /**
   * ???????
   */
  private static final int UPDATE_INTERVAL = 100;
  /**
   * ????????
   */
  private long mLastUpdateTime;
  /**
   * ???????????x??y??z????????????????????????
   */
  private float mLastX, mLastY, mLastZ;
  private SensorManager mSensorManager;
  private ArrayList<OnShakeListener> mListeners;
  /**
   * ????????????????????????????
   */
  public int mShakeThreshold = 5000;
  // ?????
  private int mSensorChangeCount = 0;
  public static boolean sCanDetact;

  public static ShakeDetector getInstance(Context context){
    if(INSTANCE == null){
      INSTANCE = new ShakeDetector(context);
    }
    return INSTANCE;
  }
  
  private ShakeDetector(Context context) {
    mSensorManager = (SensorManager) context
        .getSystemService(Context.SENSOR_SERVICE);
    mListeners = new ArrayList<OnShakeListener>();
  }

  /**
   * ???????????????
   */
  public interface OnShakeListener {
    /**
     * ?????????
     */
    void onShake();
  }

  /**
   * ??OnShakeListener?????????
   * 
   * @param listener
   */
  public void registerOnShakeListener(OnShakeListener listener) {
    if (mListeners.contains(listener))
      return;
    mListeners.add(listener);
  }

  /**
   * ????????OnShakeListener
   * 
   * @param listener
   */
  public void unregisterOnShakeListener(OnShakeListener listener) {
    mListeners.remove(listener);
  }

  /**
   * ????????
   */
  public void start() {
    if (mSensorManager == null) {
      throw new UnsupportedOperationException();
    }
    Sensor sensor = mSensorManager
        .getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
    if (sensor == null) {
      throw new UnsupportedOperationException();
    }
    mSensorManager.registerListener(this, sensor,
        SensorManager.SENSOR_DELAY_GAME);
  }

  /**
   * ????????
   */
  public void stop() {
    if (mSensorManager != null)
      mSensorManager.unregisterListener(this);
  }

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

  @Override
  public void onSensorChanged(SensorEvent event) {
    long currentTime = System.currentTimeMillis();
    long diffTime = currentTime - mLastUpdateTime;
    if (diffTime < UPDATE_INTERVAL)
      return;
    mLastUpdateTime = currentTime;
    float x = event.values[0];
    float y = event.values[1];
    float z = event.values[2];
    float deltaX = x - mLastX;
    float deltaY = y - mLastY;
    float deltaZ = z - mLastZ;
    mLastX = x;
    mLastY = y;
    mLastZ = z;
    double delta = Math.sqrt(deltaX * deltaX + deltaY * deltaY + deltaZ
        * deltaZ)
        / diffTime * 10000;
    if (delta > mShakeThreshold) { // ???????????????????????
      mSensorChangeCount++;
    }
    if (mSensorChangeCount == 3) {
      this.notifyListeners();
      mSensorChangeCount = 0;
    }
  }

  /**
   * ????????????????listener
   */
  private void notifyListeners() {
    for (OnShakeListener listener : mListeners) {
      listener.onShake();
    }
  }
}

Java Source Code List