class IV extends ImageView {
    Drawable marker;
    ScaleGestureDetector sgd;
    GestureDetector gd;
    Bitmap bitmap;

    public IV(Context context) {
        super(context);
            /*
// R.drawable.ic_marker
<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="24dp" android:height="24dp"
    android:viewportWidth="16.0" android:viewportHeight="16.0"
>
    <path android:fillColor="#b3b3b3" android:pathData="M7,0h2v3h-2z"/>
    <path android:fillColor="#b3b3b3" android:pathData="M7,12 L8,9 9,12 9,16 7,16z"/>
    <path android:fillColor="#b3b3b3" android:pathData="M16,7 L16,9 12,9 9,8 12,7z"/>
    <path android:fillColor="#b3b3b3" android:pathData="M4,7 L7,8 4,9 0,9 0,7z"/>
    <path android:fillColor="#008000" android:pathData="M8,3C5.239,3 3,5.239 3,8C3,10.761 5.239,13 8,13C10.761,13 13,10.761 13,8C13,5.239 10.761,3 8,3zM8,5C9.657,5 11,6.343 11,8C11,9.657 9.657,11 8,11C6.343,11 5,9.657 5,8C5,6.343 6.343,5 8,5z"/>
</vector>
             */
        marker = VectorDrawableCompat.create(getResources(), R.drawable.ic_marker, null);
        bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.chrome);
        setImageBitmap(bitmap);
        setScaleType(ScaleType.MATRIX);
        sgd = new ScaleGestureDetector(context, listener1);
        gd = new GestureDetector(context, listener2);
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        int size = w / 4;
        marker.setBounds(0, 0, size, size);
        Matrix m = new Matrix();
        RectF src = new RectF(0, 0, bitmap.getWidth(), bitmap.getHeight());
        RectF dst = new RectF(0, 0, w, h);
        m.setRectToRect(src, dst, Matrix.ScaleToFit.CENTER);
        setImageMatrix(m);
    }

    ScaleGestureDetector.OnScaleGestureListener listener1 = new ScaleGestureDetector.SimpleOnScaleGestureListener() {
        @Override
        public boolean onScale(ScaleGestureDetector detector) {
            Matrix m = getImageMatrix();
            float scale = detector.getScaleFactor();
            m.postScale(scale, scale, detector.getFocusX(), detector.getFocusY());
            invalidate();
            return true;
        }
    };
    GestureDetector.OnGestureListener listener2 = new GestureDetector.SimpleOnGestureListener() {
        @Override
        public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
            Matrix m = getImageMatrix();
            m.postTranslate(-distanceX, -distanceY);
            invalidate();
            return true;
        }
    };

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        sgd.onTouchEvent(event);
        gd.onTouchEvent(event);
        return true;
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        // draw your markers here by calling:
        // Drawable#draw(Canvas);
    }
};