How can I create a speech-bubble border for a Google Marker Custom Icon using Picasso?

Question

How can I use Picasso and Google Marker Custom Icon to achieve this feature?

I know how to use Picasso for the image, but I don\'t know how to add that \"ma

Answer 1

Here is a transformation class that I got working. It's lacking the corner radius and any gradients, but it has the inverted pyramid on the bottom, and it should serve as a good starting point.

Here is the transformation class:

import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.RectF;
import android.graphics.Shader;

public class BubbleTransformation implements com.squareup.picasso.Transformation {
    private static final int outerMargin = 40;
    private final int margin;  // dp

    // margin is the board in dp
    public BubbleTransformation(final int margin) {
        this.margin = margin;
    }

    @Override
    public Bitmap transform(final Bitmap source) {
        Bitmap output = Bitmap.createBitmap(source.getWidth(), source.getHeight(), Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(output);

        Paint paintBorder = new Paint();
        paintBorder.setColor(Color.CYAN);
        paintBorder.setStrokeWidth(margin);
        canvas.drawRoundRect(new RectF(outerMargin, outerMargin, source.getWidth() - outerMargin, source.getHeight() - outerMargin), 0, 0, paintBorder);

        Paint trianglePaint = new Paint(Paint.ANTI_ALIAS_FLAG);

        trianglePaint.setStrokeWidth(2);
        trianglePaint.setColor(Color.CYAN);
        trianglePaint.setStyle(Paint.Style.FILL_AND_STROKE);
        trianglePaint.setAntiAlias(true);

        Path triangle = new Path();
        triangle.setFillType(Path.FillType.EVEN_ODD);
        triangle.moveTo(outerMargin, source.getHeight() / 2);
        triangle.lineTo(source.getWidth()/2,source.getHeight());
        triangle.lineTo(source.getWidth()-outerMargin,source.getHeight()/2);
        triangle.close();

        canvas.drawPath(triangle, trianglePaint);

        final Paint paint = new Paint();
        paint.setAntiAlias(true);
        paint.setShader(new BitmapShader(source, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP));
        canvas.drawRoundRect(new RectF(margin+outerMargin, margin+outerMargin, source.getWidth() - (margin + outerMargin), source.getHeight() - (margin + outerMargin)), 0, 0, paint);

        if (source != output) {
            source.recycle();
        }

        return output;
    }

    @Override
    public String key() {
        return "rounded";
    }
}

The call to Picasso:

 Picasso.with(getActivity())
            .load(user_photo_url)
            .resize(250,250)
            .centerCrop()
            .transform(new BubbleTransformation(20))
            .into(mTarget);

The Target:

Target mTarget = new Target() {
    @Override
    public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
        Marker driver_marker = mMap.addMarker(new MarkerOptions()
                        .position(latLng)
                        .icon(BitmapDescriptorFactory.fromBitmap(bitmap))
                        .title("test")
                        .snippet("test address")
        );
    }

    @Override
    public void onBitmapFailed(Drawable errorDrawable) {
        Log.d("picasso", "onBitmapFailed");
    }

    @Override
    public void onPrepareLoad(Drawable placeHolderDrawable) {

    }
};

Result: