CODEWITHSUNDEEP
android
KKC
KKC

Reputation: 548

How to set onTouchEvent on Bitmap image using canvas.

i'm new in android development. I wanted to set onTouchEvent particularly for an image. so that i can do some work ,like increase score etc....

Here is the sample code i tried..

    @Override
protected void onDraw(Canvas canvas) 
{
          canvas.drawBitmap(image1, random.nextInt(455), random.nextInt(270), paint);
          canvas.drawText("SCORE = "+score, 10, 20, paint);
    }

     @Override
public boolean onTouchEvent(MotionEvent event) 
{
    // TODO Auto-generated method stub

    if(toggelFlag)
    {
        score = score+10;

    }

    return super.onTouchEvent(event);

}

Actually i wanted to increase the score once i touch the image only. But here if i touch anywhere in the screen its increase the score. I want it for image only.

Upvotes: 2

Views: 4805

Answers (2)

vicentazo
vicentazo

Reputation: 1809

Create a Region object with the image bounds like this:

Region region = new Region(left, top, right, bottom);

left, top, right and bottom define the image bounds.

Then, when you handle a touch event check if region contains the event position. Would be:

public boolean onTouchEvent(MotionEvent event)
{
    float x = event.getX();
    float y = event.getY();

    if(region.contains((int)x, (int)y))
    {
        // touch in image
    }

    return super.onTouchEvent(event);
}

Upvotes: 4

Ramesh Akula
Ramesh Akula

Reputation: 5750

Try this one... Set onTouch listener to imageview...

1.Take on Linearlayout and add child like this

linear.addView(new CustomImage(this)); 
        linear.setOnTouchListener(new View.OnTouchListener() {

            @Override
            public boolean onTouch(View v, MotionEvent event) {
                // TODO Auto-generated method stub
                return true;
            }
        });

2.CustomImage extens view ,Your onDraw method is in this class should be like this.

    private CustomImage  extends View
    {
       @Override
   protected void onDraw(Canvas canvas) 
   {
          canvas.drawBitmap(image1, random.nextInt(455), random.nextInt(270), paint);
          canvas.drawText("SCORE = "+score, 10, 20, paint);
    }

Upvotes: 0

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