Android Open Source - Boxee-Thumb-Remote Shake Listener

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Back to project page Boxee-Thumb-Remote.

License

The source code is released under:

Apache License

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Java Source Code

/* The following code was written by Menny Even Danan
 * and is released under the APACHE 2.0 license
 */*  w w  w  . ja va  2  s  .c  o  m*/
 * http://www.apache.org/licenses/LICENSE-2.0
 */
package net.evendanan.android.thumbremote;

import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.util.Log;
import android.content.Context;
import java.lang.UnsupportedOperationException;

public class ShakeListener implements SensorEventListener 
{
  private static final int SHAKE_SPEED_THRESHOLD = 500;
  private static final int TIME_THRESHOLD = 50;
  private static final int SHAKING_TIME = 300;
  private static final String TAG = ShakeListener.class.toString();

  private SensorManager mSensorMgr;
  
  private float mLastX=-1.0f, mLastY=-1.0f, mLastZ=-1.0f;
  private long mLastSampleTime;
  private long mShakeStartTime = -1;
  
  private OnShakeListener mShakeListener;
  private Context mContext;
  private Sensor mSensor;

  public interface OnShakeListener
  {
    public void onShake();
  }

  public ShakeListener(Context context) 
  { 
    mContext = context;
  }

  public void setOnShakeListener(OnShakeListener listener)
  {
    mShakeListener = listener;
  }

  public void resume() {
    mSensorMgr = (SensorManager)mContext.getSystemService(Context.SENSOR_SERVICE);
    if (mSensorMgr == null) {
      throw new UnsupportedOperationException("Sensors not supported");
    }
    mSensor = mSensorMgr.getDefaultSensor(SensorManager.SENSOR_ACCELEROMETER);
    
    boolean supported = mSensorMgr.registerListener(this, mSensor, SensorManager.SENSOR_DELAY_GAME);
    if (!supported) {
      mSensorMgr.unregisterListener(this, mSensor);
      throw new UnsupportedOperationException("Accelerometer not supported");
    }
  }

  public void pause() {
    if (mSensorMgr != null) {
      mSensorMgr.unregisterListener(this, mSensor);
      mSensorMgr = null;
      mSensor = null;
    }
  }

  @Override
  public void onAccuracyChanged(Sensor sensor, int accuracy) {
    
  }
  
  @Override
  public void onSensorChanged(SensorEvent event) { 
    if (event.sensor.getType() != SensorManager.SENSOR_ACCELEROMETER) return;
    float[] values = event.values;
  
    final long curTime = System.currentTimeMillis();
    // only allow one update every TIME_THRESHOLD ms.
    final long diffTime = (curTime - mLastSampleTime);
    
    if (diffTime > TIME_THRESHOLD) {
      Log.d(TAG, "Sampling..");
      mLastSampleTime = curTime;
      final float x = values[SensorManager.DATA_X];
      final float y = values[SensorManager.DATA_Y];
      final float z = values[SensorManager.DATA_Z];
      Log.d(TAG, "X "+x+" Y "+y+" Z "+z);
      float speed = Math.abs(x+y+z - mLastX - mLastY - mLastZ) / diffTime * 10000;
      if (speed > SHAKE_SPEED_THRESHOLD) {
        Log.d(TAG, "Passed shaking threshold.");
        //OK something is happening
        if (mShakeStartTime < 0)
          mShakeStartTime = curTime;
        if ((curTime - mShakeStartTime) > SHAKING_TIME)
        {
          Log.d(TAG, "Shaked enough! Notify!");
          //yes, this is a shake action! Do something about it!
          if (mShakeListener != null)
            mShakeListener.onShake();
        }
      }
      else
      {
        Log.d(TAG, "Too weak of a shake. Reseting state.");
        mShakeStartTime = -1;
      }
      mLastX = x;
      mLastY = y;
      mLastZ = z;
    }
  }

}

Java Source Code List