在列表视图中更改imageview位图

Question

i have a listview with a picture and some text. I set a onclicklistener so that when the user clicks the imageview the bitmap of that imageview should change. what happenes it the imageview just disappears.

      holder.imageview.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {

                holder.imageview.setImageBitmap( bitmap);

        }
    });

Answer 1

You wrote in comments that you are using:

BitmapFactory.decodeResource(null, R.drawable.myicon); which is wrong, first parameter is null, use the following instead:

Context context = getApplicationContext().getResources();
...
BitmapFactory.decodeResource(context.getResources(), R.drawable.myicon);

OR

BitmapFactory.decodeResource(getApplicationContext().getResources(), R.drawable.myicon);

and then notify the ListView adapter that image has changed:

listViewAdapter.notifyDataSetChanged();

Answer 2

try this:

    ImageButton ib = (ImageButton) findViewById(R.id.imgbtn);
    ImageView imgv = holder.(ImageView) findViewById(R.id.imagev);

    imgv.setOnClickListener(new OnClickListener() 
    {

        @Override
        public void onClick(View v) 
        {
            imgv.setImageBitmap(bm);
            adapter.notifyDataSetChanged();
        }
    });