Draw a line on ImageView set by Picasso

Question

I am trying to figure out how to simply draw a line on an image that is being set in Picasso. I found that if I simply set the image, given a URI, with Picasso and try to draw p

Answer 1

just follow the steps below:

1. Write your own class extends the class Transformation like below:

    class DrawLineTransformation implements Transformation {
   
     @Override
     public String key() {
       // TODO Auto-generated method stub
       return "drawline";
     }
   
     @Override
     public Bitmap transform(Bitmap bitmap) {
       // TODO Auto-generated method stub
       synchronized (DrawLineTransformation.class) {
         if(bitmap == null) {
           return null;
         }
         Bitmap resultBitmap = bitmap.copy(bitmap.getConfig(), true);
         Canvas canvas = new Canvas(resultBitmap);
         Paint paint = new Paint();
         paint.setColor(Color.BLUE);
         paint.setStrokeWidth(10);
         canvas.drawLine(0, resultBitmap.getHeight()/2, resultBitmap.getWidth(), resultBitmap.getHeight()/2, paint);
         bitmap.recycle();
         return resultBitmap;
       }
     }
   }
   

   2、Add the Transformation to RequestCreator created with Picasso.load() function like below:

   Picasso picasso = Picasso.with(getApplicationContext());
   DrawLineTransformation myTransformation = new DrawLineTransformation();
   picasso.load("http://www.baidu.com/img/bdlogo.png").transform(myTransformation).into(imageview);
   

That's all steps you need to do , just enjoy!