Как правильно установить fixTransX и fixTransY из TouchImageView для реализации doubleTap to ZoomOut?

Я использую TouchImageView из здесь.

Я пытаюсь реализовать ZoomOut для двойного нажатия. Я сделал это частично. Но у меня есть некоторые проблемы при увеличении. Если я увеличу изображение, и если я дам двойной кран, тогда изображение не будет отображаться правильно.

Вот моя измененная версия

TouchImageView.java

package com.bharath.downloadissuedemo;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.util.Log;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;
import android.view.View;
import android.widget.ImageView;

public class TouchImageView extends ImageView {

    Matrix matrix;

    // We can be in one of these 3 states
    static final int NONE = 0;
    static final int DRAG = 1;
    static final int ZOOM = 2;
    int mode = NONE;

    // Remember some things for zooming
    PointF last = new PointF();
    PointF start = new PointF();
    float minScale = 1f;
    float maxScale = 3f;
    float[] m;


    int viewWidth, viewHeight;
    static final int CLICK = 3;
    float saveScale = 1f;
    protected float origWidth, origHeight;
    int oldMeasuredWidth, oldMeasuredHeight;

    GestureDetector gestureDetector;
    ScaleGestureDetector mScaleDetector;

    Context context;

    public TouchImageView(Context context) {
        super(context);
        sharedConstructing(context);
        gestureDetector = new GestureDetector(getContext(), new GestureListener(this));
    }

    public TouchImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
        sharedConstructing(context);
        gestureDetector = new GestureDetector(getContext(), new GestureListener(this));
    }

    private void sharedConstructing(Context context) {
        super.setClickable(true);
        this.context = context;
        mScaleDetector = new ScaleGestureDetector(context, new ScaleListener());
        matrix = new Matrix();
        m = new float[9];
        setImageMatrix(matrix);
        setScaleType(ScaleType.MATRIX);

        setOnTouchListener(new OnTouchListener() {

            @Override
            public boolean onTouch(View v, MotionEvent event) {

                mScaleDetector.onTouchEvent(event);
                PointF curr = new PointF(event.getX(), event.getY());
                switch (event.getAction() & MotionEvent.ACTION_MASK) {
                    case MotionEvent.ACTION_DOWN:
                        last.set(curr);
                        start.set(last);
                        mode = DRAG;
                        break;

                    case MotionEvent.ACTION_MOVE:
                        if (mode == DRAG) {

                            float deltaX = curr.x - last.x;
                            float deltaY = curr.y - last.y;
                            float fixTransX = getFixDragTrans(deltaX, viewWidth, origWidth * saveScale);
                            float fixTransY = getFixDragTrans(deltaY, viewHeight, origHeight * saveScale);
                            matrix.postTranslate(fixTransX, fixTransY);
                            fixTrans();
                            last.set(curr.x, curr.y);
                        }
                        break;

                    case MotionEvent.ACTION_UP:
                        mode = NONE;

                        int xDiff = (int) Math.abs(curr.x - start.x);
                        int yDiff = (int) Math.abs(curr.y - start.y);
                        if (xDiff < CLICK && yDiff < CLICK)
                            performClick();
                        break;

                    case MotionEvent.ACTION_POINTER_UP:
                        mode = NONE;
                        break;
                }

                setImageMatrix(matrix);
                invalidate();
                return gestureDetector.onTouchEvent(event); // indicate event was handled
            }

        });
    }

    public void setMaxZoom(float x) 
    {
        maxScale = x;
    }

    private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener {
        @Override
        public boolean onScaleBegin(ScaleGestureDetector detector) {
            mode = ZOOM;
            return true;
        }

        @Override
        public boolean onScale(ScaleGestureDetector detector) {
            float mScaleFactor = detector.getScaleFactor();
            float origScale = saveScale;
            System.out.println("Orig Scale = "+origScale);
            saveScale *= mScaleFactor;
            System.out.println("Sace Scale = "+saveScale);

            System.out.println("m Scale Factor = "+mScaleFactor);
            if (saveScale > maxScale) {
                saveScale = maxScale;
                mScaleFactor = maxScale / origScale;
            } else if (saveScale < minScale) {
                saveScale = minScale;
                mScaleFactor = minScale / origScale;
            }

            if (origWidth * saveScale <= viewWidth || origHeight * saveScale <= viewHeight)
                matrix.postScale(mScaleFactor, mScaleFactor, viewWidth / 2, viewHeight / 2);
            else
                matrix.postScale(mScaleFactor, mScaleFactor, detector.getFocusX(), detector.getFocusY());

            fixTrans();
            return true;
        }
    }

    void fixTrans() {
        matrix.getValues(m);
        float transX = m[Matrix.MTRANS_X];
        float transY = m[Matrix.MTRANS_Y];

        float fixTransX = getFixTrans(transX, viewWidth, origWidth * saveScale);
        float fixTransY = getFixTrans(transY, viewHeight, origHeight * saveScale);

        System.out.println("Translation X ="+fixTransX);
        System.out.println("Translation Y ="+fixTransY);
        ((ViewPagerInterface)getContext()).enable();
        if (fixTransX != 0 || fixTransY != 0)
        {           
            matrix.postTranslate(fixTransX, fixTransY);
        }
        else if (saveScale!=1.0) 
        {
            ((ViewPagerInterface)getContext()).disable();
        } 
    }

    float getFixTrans(float trans, float viewSize, float contentSize) {
        float minTrans, maxTrans;

        if (contentSize <= viewSize) {
            minTrans = 0;
            maxTrans = viewSize - contentSize;
        } else {
            minTrans = viewSize - contentSize;
            maxTrans = 0;
        }

        if (trans < minTrans)
            return -trans + minTrans;
        if (trans > maxTrans)
            return -trans + maxTrans;
        return 0;
    }

    float getFixDragTrans(float delta, float viewSize, float contentSize) {
        if (contentSize <= viewSize) {
            return 0;
        }
        return delta;
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        viewWidth = MeasureSpec.getSize(widthMeasureSpec);
        viewHeight = MeasureSpec.getSize(heightMeasureSpec);

        //
        // Rescales image on rotation
        //
        if (oldMeasuredHeight == viewWidth && oldMeasuredHeight == viewHeight
                || viewWidth == 0 || viewHeight == 0)
            return;
        oldMeasuredHeight = viewHeight;
        oldMeasuredWidth = viewWidth;

        if (saveScale == 1) {
            //Fit to screen.
            float scale;

            Drawable drawable = getDrawable();
            if (drawable == null || drawable.getIntrinsicWidth() == 0 || drawable.getIntrinsicHeight() == 0)
                return;
            int bmWidth = drawable.getIntrinsicWidth();
            int bmHeight = drawable.getIntrinsicHeight();            
            Log.d("bmSize", "bmWidth: " + bmWidth + " bmHeight : " + bmHeight);
            float scaleX = (float) viewWidth / (float) bmWidth;
            float scaleY = (float) viewHeight / (float) bmHeight;
            scale = Math.min(scaleX, scaleY);
            matrix.setScale(scale, scale);

            // Center the image
            float redundantYSpace = (float) viewHeight - (scale * (float) bmHeight);
            float redundantXSpace = (float) viewWidth - (scale * (float) bmWidth);
            redundantYSpace /= (float) 2;
            redundantXSpace /= (float) 2;
            matrix.postTranslate(redundantXSpace, redundantYSpace);
            origWidth = viewWidth - 2 * redundantXSpace;
            origHeight = viewHeight - 2 * redundantYSpace;
            setImageMatrix(matrix);
        }
        fixTrans();
    }    

    private class GestureListener extends GestureDetector.SimpleOnGestureListener {

        public TouchImageView touchImageView=null;

        public GestureListener(TouchImageView tmv) {

            touchImageView=tmv;
        }
        @Override
        public boolean onDown(MotionEvent e) {
            return false;
        }
        // event when double tap occurs
        @Override
        public boolean onDoubleTap(MotionEvent e) 
        {           
            if (saveScale>1.0f) {
                Drawable d = getDrawable();
                Bitmap bmp = ((BitmapDrawable)d).getBitmap();
                System.out.println("bmp Width = "+bmp.getWidth());
                System.out.println("bmp Height = "+bmp.getHeight());
                System.out.println("Original Width = "+origWidth);
                System.out.println("Original Height = "+origHeight);
                System.out.println("View Width "+viewWidth);
                System.out.println("View height"+viewHeight);
                float scaleX= viewWidth/(origWidth*saveScale);
                float scaleY =viewHeight/(origHeight*saveScale);
                float finalScale = Math.min(scaleX, scaleY);

                matrix.postScale(finalScale, finalScale, viewWidth / 2, viewHeight / 2);
                saveScale=1.0f;

//              
//              float redundantYSpace = (float) viewHeight - (finalScale * (float) bmp.getHeight());
//              float redundantXSpace = (float) viewWidth - (finalScale * (float) bmp);
//              redundantYSpace /= (float) 2;
//              redundantXSpace /= (float) 2;
//              matrix.postTranslate(redundantXSpace, redundantYSpace);

                 matrix.getValues(m);
                 float transX = m[Matrix.MTRANS_X];
                 float transY = m[Matrix.MTRANS_Y];

                 float fixTransX = getFixTrans(transX, viewWidth, origWidth * finalScale);
                 float fixTransY = getFixTrans(transY, viewHeight, origHeight * finalScale);
//
                 System.out.println("Translation X ="+transX);
                 System.out.println("Translation Y ="+transY);

                 System.out.println("Fix X ="+fixTransX);
                 System.out.println("Fix Y ="+fixTransY);
                 ((ViewPagerInterface)getContext()).enable();
                 matrix.postTranslate(fixTransX, fixTransY);
            }

//          fixTrans();


//          System.out.println("Intrinsic Width "+bmp.getWidth());
//          System.out.println("Intrinsic Height "+bmp.getHeight());
//          RectF drawableRect = new RectF(0, 0,bmp.getWidth(),bmp.getHeight());
//          RectF viewRect = new RectF(0, 0,getWidth(), getHeight());
//          m.setRectToRect(drawableRect, viewRect, Matrix.ScaleToFit.CENTER);
//          setScale(,);
//          setScaleX(getWidth()/bmp.getWidth());
//          setScaleY( getHeight()/bmp.getHeight());

//setScaleX(scaleX)//           saveScale=1.0f;
//          setImageMatrix(m);

//          invalidate();
            return true;
        }

        @Override
        public boolean onSingleTapConfirmed(MotionEvent e) {

//          System.out.println("SIngle Tap Occurred");
//          touchImageView.saveScale=1.0f;
//          touchImageView.invalidate();
            return super.onSingleTapConfirmed(e);
        }
    }
}

В приведенном выше коде см. метод

 public boolean onDoubleTap(MotionEvent e)

Какова была ошибка, которую я сделал в вышеупомянутом методе?