Question

I am developing an app that requires mee to allow user to draw any text on an image shown.
I am not able to get the correct term to search the web- should i call it sensing or call it touch event or what it is a gesture application.
Precisely i want to enable the user to scribble any thing or draw any thing on the image.
I have few ideas like it can use canvas or some overlay element But nothing concrete.

P.S. :
I am using the android 2.2 as target.
I am new to android development.
Please help !

Answer 1

Well Answering my own first question 🙂
Actually i could not get directly to the solution – but atleast found 2 ways out.

1. You can take 2 imageview’s. Allocate the 1st Imageview ( ref it as imageview1 ) with the image source and then place the 2nd Imageview ( ref it as imageview2 ) on imageview1 , such a way that it covers entire screen ( fill parent – both height and width ) .
   Now in .java file , assign imageview2.setOnTouchListener(this); and override the onLoad() method as per your need . Eg.

   `public boolean onTouch(View v, MotionEvent event) {

   int action = event.getAction();
   switch (action) {
   case MotionEvent.ACTION_DOWN:
   
       oldx = downx = event.getX();
       oldy = downy = event.getY();            
       break;
   
   case MotionEvent.ACTION_MOVE:
   
       downx = event.getX();
       downy = event.getY();
   
       canvas.drawLine(oldx, oldy, downx, downy, paint);
       imgvw.invalidate();
   
       oldx = downx ;
       oldy = downy ;          
       break;
   
   case MotionEvent.ACTION_UP:
       upx = event.getX();
       upy = event.getY();
   
       canvas.drawLine(oldx, oldy, upx, upy, paint);
       imgvw.invalidate();
   
       break;
   case MotionEvent.ACTION_CANCEL:
                    // SOME CODE THAT YOU WANNA USE 
       break;
   default:
       break;
   }
   return true;
   

   }`

Paint paint = new Paint() ;

paint.setColor(Color.GREEN);

This will help to draw on imageview2 but it would seem as if it is been drawn on imageview1 🙂

1. The second method is pretty straight forward –
   Create a new class ( cal it MyImageview ) extending ImageView .
   Now in your activity class, create an object of MyImageView and setContentView(myImageView(this)) and attach a setOnTouchListener(this); , implement the onTouch method as specified above and this will work fine .