CODEWITHSUNDEEP
javaandroidbitmapandroid-image
Abin Thaha
Abin Thaha

Reputation: 4633

setPixel() returns a NullPointerException

Friends , when i tried to use the setPixel(x, y, color) in my app , it returns a NullPointerException and stopps working. Here is my code. Please help me to get out of the error. Thanks in advance

decode=(Button)findViewById(R.id.button1);
    decode.setOnClickListener(new View.OnClickListener() 
    {

        @Override
        public void onClick(View v) 
        {
            // TODO Auto-generated method stub
            try
            {
            Bitmap result = BitmapFactory.decodeFile(filePath);



            int x=result.getPixel(10, 10);  
            int pixelAlpha=   Color.alpha(x);
            int red =   65;// represent character A
            int green=    Color.green(x);
            int blue=    Color.blue(x);

            int newPixel=Color.argb(pixelAlpha,red,green,blue);

            result.setPixel(10, 10, newPixel);   


             ImageView myNewImage=(ImageView)findViewById(R.id.imageView2);
             myNewImage.setImageBitmap(result);

            }
            catch(Exception exc)
            {
                Toast.makeText(getBaseContext(), "Exception : "+exc, Toast.LENGTH_LONG).show();
            }
        }
    });

Upvotes: 0

Views: 207

Answers (1)

user695992
user695992

Reputation:

It looks like Bitmap result = BitmapFactory.decodeFile(filePath); could not properly decode your filePath. Ensure result is not null and your filePath is correct.

Upvotes: 2

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