Android OnClickListener NullPointerException

all. I've searched, but can't find anything that helps me fix this problem. My app quits almost immediately on launch due to a NullPointerException. I suspect maybe the problem is

Solution 1:

blankTile = (ImageView) findViewById(R.drawable.blank); 

you can not use R.drawable to retrieve items. You have to use R.id

Solution 2:

To get Id of View,use R.id instead of R.drawable,So change

blankTile = (ImageView) findViewById(R.drawable.blank); 

to

blankTile = (ImageView) findViewById(R.id.blank); 

And set drawable using blankTile.setImageResource(R.drawable.zero);