setPixel（）返回NullPointerException

Question

朋友，当我尝试在我的应用中使用setPixel（x，y，color）时，它会返回NullPointerException并停止工作。这是我的代码。请帮我摆脱错误。提前致谢

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();
            }
        }
    });

Answer 1

看起来Bitmap result = BitmapFactory.decodeFile(filePath);无法正确解码您的filePath。确保结果不为null且filePath正确。