android, add Marker from Bitmap on googlemap

Question

I'm using googlemap-android-api v2, and want to create the marker from a Bitmap at runtime. So I do:

        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inPreferredConfig = Bitmap.Config.ARGB_8888;
        Bitmap bitmap = BitmapFactory.decodeFile(filePath, options);
        //create the thumbnail to use as marker
        Bitmap thumbnail = ThumbnailUtils.extractThumbnail(bitmap,10,10);
        MarkerOptions markerOptions = new MarkerOptions().position(currentLatLng).icon(BitmapDescriptorFactory.fromBitmap(thumbnail));
        mMap.addMarker(markerOptions)

It never seems to work, I'm sure both bitmap and thumbnail are not null. If instead of .fromBitmap, I use .fromResource(R.drawable.some_image) then it shows. However, as I said, I want to change at run-time from user's input.

Any tip? thanks

Updated: The marker does show if I add it (i.e, use the above code) at onResume() of the Activity/Fragment that host the map. Before I use this code at onActivityResult(), after the user browse a file to get the filePath. To me, it's still strange since onActivityResult() is on the UI thread. Anyway, whatever works.

Answer 1

I am doing the same this like following

First I create a Drawable from a path on runtime

Drawable drawable = Drawable.createFromPath(filePath);

Then I simply add it to marker like this

mMap.addMarker(new MarkerOptions()
            .position(location)
            .title(title)
            .icon(BitmapDescriptorFactory.fromBitmap(((BitmapDrawable)drawable).getBitmap())));

I hope it helps.

Answer 2

If you have a marker object then you can use it like the below method.

 Bitmap smallDot = Bitmap.createScaledBitmap(getBitmapFromVectorDrawable(getApplicationContext(),
                R.drawable.red_dot), 15, 15, false);

marker.setIcon(BitmapDescriptorFactory.fromBitmap(smallDot));