How to use com.oginotihiro.cropview.gestures

  public static GestureDetector newInstance(Context context, OnGestureListener listener) {
    final int sdkVersion = Build.VERSION.SDK_INT;
    GestureDetector detector;

    if (sdkVersion < Build.VERSION_CODES.ECLAIR) {
      detector = new CupcakeGestureDetector(context);
    } else if (sdkVersion < Build.VERSION_CODES.FROYO) {
      detector = new EclairGestureDetector(context);
    } else {
      detector = new FroyoGestureDetector(context);
    }

    detector.setOnGestureListener(listener);

    return detector;
  }
}

  @Override
  public boolean onTouchEvent(MotionEvent ev) {
    mDetector.onTouchEvent(ev);
    return super.onTouchEvent(ev);
  }
}

@Override
public void onDrag(float dx, float dy) {
  if (mDragScaleDetector.isScaling()) {
    return;
  }
  mSuppMatrix.postTranslate(dx, dy);
  checkAndDisplayMatrix();
}

mLastTouchX = getActiveX(ev);
mLastTouchY = getActiveY(ev);
mIsDragging = false;
break;
final float x = getActiveX(ev);
final float y = getActiveY(ev);
final float dx = x - mLastTouchX, dy = y - mLastTouchY;
  mListener.onDrag(dx, dy);
  mLastTouchX = x;
  mLastTouchY = y;
if (mIsDragging) {
  if (null != mVelocityTracker) {
    mLastTouchX = getActiveX(ev);
    mLastTouchY = getActiveY(ev);
      mListener.onFling(mLastTouchX, mLastTouchY, -vX, -vY);

@Override
public boolean onScale(ScaleGestureDetector detector) {
  float scaleFactor = detector.getScaleFactor();
  if (Float.isNaN(scaleFactor) || Float.isInfinite(scaleFactor)) {
    return false;
  }
  mListener.onScale(scaleFactor, detector.getFocusX(), detector.getFocusY());
  return true;
}

@Override
public boolean onTouchEvent(MotionEvent ev) {
  final int action = ev.getAction();
  switch (action & MotionEvent.ACTION_MASK) {
    case MotionEvent.ACTION_DOWN:
      mActivePointerId = ev.getPointerId(0);
      break;
    case MotionEvent.ACTION_CANCEL:
    case MotionEvent.ACTION_UP:
      mActivePointerId = INVALID_POINTER_ID;
      break;
    case MotionEvent.ACTION_POINTER_UP:
      // Ignore deprecation, ACTION_POINTER_ID_MASK and
      // ACTION_POINTER_ID_SHIFT has same value and are deprecated
      // You can have either deprecation or lint target api warning
      final int pointerIndex = Compat.getPointerIndex(ev.getAction());
      final int pointerId = ev.getPointerId(pointerIndex);
      if (pointerId == mActivePointerId) {
        // This was our active pointer going up. Choose a new
        // active pointer and adjust accordingly.
        final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
        mActivePointerId = ev.getPointerId(newPointerIndex);
        mLastTouchX = ev.getX(newPointerIndex);
        mLastTouchY = ev.getY(newPointerIndex);
      }
      break;
  }
  mActivePointerIndex = ev.findPointerIndex(mActivePointerId != INVALID_POINTER_ID ? mActivePointerId : 0);
  return super.onTouchEvent(ev);
}

@Override
public boolean onTouchEvent(MotionEvent ev) {
  boolean handled = false;
  if (getDrawable() != null && mCropRect != null) {
    switch (ev.getAction()) {
      case ACTION_DOWN:
        cancelFling();
        break;
      case ACTION_CANCEL:
      case ACTION_UP:
        break;
    }
    if (null != mDragScaleDetector) {
      handled = mDragScaleDetector.onTouchEvent(ev);
    }
    if (null != mGestureDetector && mGestureDetector.onTouchEvent(ev)) {
      handled = true;
    }
  }
  return true;
}

public CropView(Context context, AttributeSet attrs, int defStyleAttr) {
  super(context, attrs, defStyleAttr);
  setScaleType(ScaleType.MATRIX);
  mDragScaleDetector = VersionedGestureDetector.newInstance(context, this);
  mGestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener());
  mGestureDetector.setOnDoubleTapListener(new DefaultOnDoubleTapListener());
  outlinePaint.setAntiAlias(true);
  outlinePaint.setColor(highlightColor);
  outlinePaint.setStyle(Paint.Style.STROKE);
  outlinePaint.setStrokeWidth(dpToPx(OUTLINE_DP));
  outsidePaint.setARGB(125, 50, 50, 50);
  ViewTreeObserver observer = getViewTreeObserver();
  if (null != observer) {
    observer.addOnGlobalLayoutListener(this);
  }
}

  public static GestureDetector newInstance(Context context, OnGestureListener listener) {
    final int sdkVersion = Build.VERSION.SDK_INT;
    GestureDetector detector;

    if (sdkVersion < Build.VERSION_CODES.ECLAIR) {
      detector = new CupcakeGestureDetector(context);
    } else if (sdkVersion < Build.VERSION_CODES.FROYO) {
      detector = new EclairGestureDetector(context);
    } else {
      detector = new FroyoGestureDetector(context);
    }

    detector.setOnGestureListener(listener);

    return detector;
  }
}

mLastTouchX = getActiveX(ev);
mLastTouchY = getActiveY(ev);
mIsDragging = false;
break;
final float x = getActiveX(ev);
final float y = getActiveY(ev);
final float dx = x - mLastTouchX, dy = y - mLastTouchY;
  mListener.onDrag(dx, dy);
  mLastTouchX = x;
  mLastTouchY = y;
if (mIsDragging) {
  if (null != mVelocityTracker) {
    mLastTouchX = getActiveX(ev);
    mLastTouchY = getActiveY(ev);
      mListener.onFling(mLastTouchX, mLastTouchY, -vX, -vY);

  @Override
  public boolean onTouchEvent(MotionEvent ev) {
    mDetector.onTouchEvent(ev);
    return super.onTouchEvent(ev);
  }
}

@Override
public void onDrag(float dx, float dy) {
  if (mDragScaleDetector.isScaling()) {
    return;
  }
  mSuppMatrix.postTranslate(dx, dy);
  checkAndDisplayMatrix();
}

@Override
public boolean onScale(ScaleGestureDetector detector) {
  float scaleFactor = detector.getScaleFactor();
  if (Float.isNaN(scaleFactor) || Float.isInfinite(scaleFactor)) {
    return false;
  }
  mListener.onScale(scaleFactor, detector.getFocusX(), detector.getFocusY());
  return true;
}

@Override
public boolean onTouchEvent(MotionEvent ev) {
  final int action = ev.getAction();
  switch (action & MotionEvent.ACTION_MASK) {
    case MotionEvent.ACTION_DOWN:
      mActivePointerId = ev.getPointerId(0);
      break;
    case MotionEvent.ACTION_CANCEL:
    case MotionEvent.ACTION_UP:
      mActivePointerId = INVALID_POINTER_ID;
      break;
    case MotionEvent.ACTION_POINTER_UP:
      // Ignore deprecation, ACTION_POINTER_ID_MASK and
      // ACTION_POINTER_ID_SHIFT has same value and are deprecated
      // You can have either deprecation or lint target api warning
      final int pointerIndex = Compat.getPointerIndex(ev.getAction());
      final int pointerId = ev.getPointerId(pointerIndex);
      if (pointerId == mActivePointerId) {
        // This was our active pointer going up. Choose a new
        // active pointer and adjust accordingly.
        final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
        mActivePointerId = ev.getPointerId(newPointerIndex);
        mLastTouchX = ev.getX(newPointerIndex);
        mLastTouchY = ev.getY(newPointerIndex);
      }
      break;
  }
  mActivePointerIndex = ev.findPointerIndex(mActivePointerId != INVALID_POINTER_ID ? mActivePointerId : 0);
  return super.onTouchEvent(ev);
}

@Override
public boolean onTouchEvent(MotionEvent ev) {
  boolean handled = false;
  if (getDrawable() != null && mCropRect != null) {
    switch (ev.getAction()) {
      case ACTION_DOWN:
        cancelFling();
        break;
      case ACTION_CANCEL:
      case ACTION_UP:
        break;
    }
    if (null != mDragScaleDetector) {
      handled = mDragScaleDetector.onTouchEvent(ev);
    }
    if (null != mGestureDetector && mGestureDetector.onTouchEvent(ev)) {
      handled = true;
    }
  }
  return handled;
}

public CropView(Context context, AttributeSet attrs, int defStyleAttr) {
  super(context, attrs, defStyleAttr);
  setScaleType(ScaleType.MATRIX);
  mDragScaleDetector = VersionedGestureDetector.newInstance(context, this);
  mGestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener());
  mGestureDetector.setOnDoubleTapListener(new DefaultOnDoubleTapListener());
  outlinePaint.setAntiAlias(true);
  outlinePaint.setColor(highlightColor);
  outlinePaint.setStyle(Paint.Style.STROKE);
  outlinePaint.setStrokeWidth(dpToPx(OUTLINE_DP));
  outsidePaint.setARGB(125, 50, 50, 50);
  ViewTreeObserver observer = getViewTreeObserver();
  if (null != observer) {
    observer.addOnGlobalLayoutListener(this);
  }
}