How to add a Marker/Pin on an ImageView Android?

Question

I would like to ask on how to implement or add a marker on an imageView. I rendered an SVG using svglib and used a customImageView so that I can zoom and pan around the image.

here is my code on how i used my customImageView

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        SVG svg;
        switch (mNum) {

        case 1:
            svg = SVGParser.getSVGFromResource(getResources(), R.raw.t1);
            break;
        case 2:
            svg = SVGParser.getSVGFromResource(getResources(), R.raw.t2);
            break;
        case 3:
            svg = SVGParser.getSVGFromResource(getResources(), R.raw.t3);
            break;
        case 4:
            svg = SVGParser.getSVGFromResource(getResources(), R.raw.t4);
            break;
        default:
            svg = SVGParser.getSVGFromResource(getResources(),
                    R.raw.android);

        }

        View v = inflater.inflate(R.layout.hello_world, container, false);
        View tv = v.findViewById(R.id.text);
        imageView = (GestureImageView) v.findViewById(R.id.imageView1);
        imageView.setStrict(false);
        imageView.setStartingScale(lastScale);
        // if(lastXPosition!=0 && lastYPosition!=0)
        imageView.setStartingPosition(lastXPosition, lastYPosition);
        // Log.i("tag",
        // "lastXPosition" + lastXPosition);
        // Log.i("tag",
        // "lastYPosition" + lastYPosition);
        // Log.i("tag",
        // "lastScale" + lastScale);
        // imageView.setRotation(45);
        // imageView.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
        if (Build.VERSION.SDK_INT > 15)
            imageView.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
        imageView.setImageDrawable(svg.createPictureDrawable());
        ((TextView) tv).setText("Floor number: " + mNum);
        imageView.setBackgroundColor(Color.WHITE);
        // tv.setBackgroundDrawable(getResources().getDrawable(
        // android.R.drawable.gallery_thumb));
        // imageView.setScaleType(ScaleType.CENTER);
        // ((GestureImageView)imageView).setScale(x);
        return v;
    }

Now I would like to add a pin just like the image below...

_{(source: modality.com)}

But my problem is that when I pan around the marker I added is not bonded with the image SVG thus left behind at a certain position when panning...

Here's my code... NOTE: Not yet final... I'm still looking for a way to get this working and I am using a zoomed in imageview as a map...

@Override
protected void onDraw(Canvas canvas) {

    if (layout) {
        if (drawable != null && !isRecycled()) {
            canvas.save();

            float adjustedScale = scale * scaleAdjust;

            canvas.translate(x, y);

            if (rotation != 0.0f) {
                canvas.rotate(rotation);
            }

            if (adjustedScale != 1.0f) {
                canvas.scale(adjustedScale, adjustedScale);
            }

            drawable.draw(canvas);

            canvas.restore();
        }

        if (drawLock.availablePermits() <= 0) {
            drawLock.release();
        }
    }

    // ---add the marker---
    Bitmap marker = BitmapFactory.decodeResource(getResources(),
            R.drawable.search_marker_icon);
    canvas.drawBitmap(marker, 40, 40, null);
    Paint mPaint = new Paint();
    mPaint.setColor(Color.RED);
    canvas.drawCircle(60, 60, 5, mPaint);
    super.onDraw(canvas);
} 

Thanks.... I'm new to android :) hope you can help me....

Answer 1

This is a nice library for displaying images, which supports zooming/panning and adding pins over the image https://github.com/davemorrissey/subsampling-scale-image-view