Custom Zoom imageview zoom function not working at scaletype center inside
<p>I am using <code>TouchImageview custom imageview class</code> has used for pich zoom images and it's working perfectly but,when i am set Touchimageview scale type to center inside it's not working pinch zoom can any one help me i want to zoom image with scale type center inside!</p>

<p>Here's my custom imageview class code:</p>

<pre><code>public class TouchImageView extends ImageView {

    Matrix matrix = new 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;

    float redundantXSpace, redundantYSpace;

    float width, height;
    static final int CLICK = 3;
    float saveScale = 1f;
    float right, bottom, origWidth, origHeight, bmWidth, bmHeight;

    ScaleGestureDetector mScaleDetector;

    Context context;

    public TouchImageView(Context context) {
        super(context);
        sharedConstructing(context);
    }

    public TouchImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
        sharedConstructing(context);
    }

    private void sharedConstructing(Context context) {
        super.setClickable(true);
        this.context = context;
        mScaleDetector = new ScaleGestureDetector(context, new ScaleListener());
        matrix.setTranslate(1f, 1f);
        m = new float[9];
        setImageMatrix(matrix);
        setScaleType(ScaleType.MATRIX);

        setOnTouchListener(new OnTouchListener() {

            public boolean onTouch(View v, MotionEvent event) {
                mScaleDetector.onTouchEvent(event);

                matrix.getValues(m);
                float x = m[Matrix.MTRANS_X];
                float y = m[Matrix.MTRANS_Y];
                PointF curr = new PointF(event.getX(), event.getY());

                switch (event.getAction()) {
                    case MotionEvent.ACTION_DOWN:
                        last.set(event.getX(), event.getY());
                        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 scaleWidth = Math.round(origWidth * saveScale);
                            float scaleHeight = Math.round(origHeight * saveScale);
                            if (scaleWidth &lt; width) {
                                deltaX = 0;
                                if (y + deltaY &gt; 0)
                                    deltaY = -y;
                                else if (y + deltaY &lt; -bottom)
                                    deltaY = -(y + bottom); 
                            } else if (scaleHeight &lt; height) {
                                deltaY = 0;
                                if (x + deltaX &gt; 0)
                                    deltaX = -x;
                                else if (x + deltaX &lt; -right)
                                    deltaX = -(x + right);
                            } else {
                                if (x + deltaX &gt; 0)
                                    deltaX = -x;
                                else if (x + deltaX &lt; -right)
                                    deltaX = -(x + right);

                                if (y + deltaY &gt; 0)
                                    deltaY = -y;
                                else if (y + deltaY &lt; -bottom)
                                    deltaY = -(y + bottom);
                            }
                            matrix.postTranslate(deltaX, deltaY);
                            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 &lt; CLICK &amp;&amp; yDiff &lt; CLICK)
                            performClick();
                        break;

                    case MotionEvent.ACTION_POINTER_UP:
                        mode = NONE;
                        break;
                }
                setImageMatrix(matrix);
                invalidate();
                return true; // indicate event was handled
            }

        });
    }

    @Override
    public void setImageBitmap(Bitmap bm) { 
        super.setImageBitmap(bm);
        if(bm != null) {
            bmWidth = bm.getWidth();
            bmHeight = bm.getHeight();
        }
    }

    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;
            saveScale *= mScaleFactor;
            if (saveScale &gt; maxScale) {
                saveScale = maxScale;
                mScaleFactor = maxScale / origScale;
            } else if (saveScale &lt; minScale) {
                saveScale = minScale;
                mScaleFactor = minScale / origScale;
            }
            right = width * saveScale - width - (2 * redundantXSpace * saveScale);
            bottom = height * saveScale - height - (2 * redundantYSpace * saveScale);
            if (origWidth * saveScale &lt;= width || origHeight * saveScale &lt;= height) {
                matrix.postScale(mScaleFactor, mScaleFactor, width / 2, height / 2);
                if (mScaleFactor &lt; 1) {
                    matrix.getValues(m);
                    float x = m[Matrix.MTRANS_X];
                    float y = m[Matrix.MTRANS_Y];
                    if (mScaleFactor &lt; 1) {
                        if (Math.round(origWidth * saveScale) &lt; width) {
                            if (y &lt; -bottom)
                                matrix.postTranslate(0, -(y + bottom));
                            else if (y &gt; 0)
                                matrix.postTranslate(0, -y);
                        } else {
                            if (x &lt; -right) 
                                matrix.postTranslate(-(x + right), 0);
                            else if (x &gt; 0) 
                                matrix.postTranslate(-x, 0);
                        }
                    }
                }
            } else {
                matrix.postScale(mScaleFactor, mScaleFactor, detector.getFocusX(), detector.getFocusY());
                matrix.getValues(m);
                float x = m[Matrix.MTRANS_X];
                float y = m[Matrix.MTRANS_Y];
                if (mScaleFactor &lt; 1) {
                    if (x &lt; -right) 
                        matrix.postTranslate(-(x + right), 0);
                    else if (x &gt; 0) 
                        matrix.postTranslate(-x, 0);
                    if (y &lt; -bottom)
                        matrix.postTranslate(0, -(y + bottom));
                    else if (y &gt; 0)
                        matrix.postTranslate(0, -y);
                }
            }
            return true;

        }
    }

    @Override
    protected void onMeasure (int widthMeasureSpec, int heightMeasureSpec)
    {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        width = MeasureSpec.getSize(widthMeasureSpec);
        height = MeasureSpec.getSize(heightMeasureSpec);
        //Fit to screen.
        float scale;
        float scaleX =  (float)width / (float)bmWidth;
        float scaleY = (float)height / (float)bmHeight;
        scale = Math.min(scaleX, scaleY);
        matrix.setScale(scale, scale);
        setImageMatrix(matrix);
        saveScale = 1f;

        // Center the image
        redundantYSpace = (float)height - (scale * (float)bmHeight) ;
        redundantXSpace = (float)width - (scale * (float)bmWidth);
        redundantYSpace /= (float)2;
        redundantXSpace /= (float)2;

        matrix.postTranslate(redundantXSpace, redundantYSpace);

        origWidth = width - 2 * redundantXSpace;
        origHeight = height - 2 * redundantYSpace;
        right = width * saveScale - width - (2 * redundantXSpace * saveScale);
        bottom = height * saveScale - height - (2 * redundantYSpace * saveScale);
        setImageMatrix(matrix);
    }
}
</code></pre>

<p>That's code works well on not set scale type center inside!</p>

<p>I am set touchimageview class scale type below code:</p>

<pre><code>    myImageView = (TouchImageView)findViewById(R.id.imageviewzooming);
    myImageView.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
    myImageView.setImageBitmap(bitmap);
    myImageView.setMaxZoom(4f);
</code></pre>

<p>That's code setting TouchImageView doesn't work zoom functionality!</p>

<p>I want to zoom image with scale type center inside!</p>

<p>Thanks in Advance!  </p>
