I am working in an android application and I want to Clear my Bitmap data. The scenario is that I am taking a screen capture of an Widget(Imageview) and I am storing it in a Bitmap. This action comes in a Button click. SO after some time I get a Memory error. So I want to clear the values in the bitmap. So to do that I have done the following code : The BitMap variable is mCaptureImageBitmap

  public void ButtonClick(View v)
    {
               mCaptureImageBitmap.recycle();   
               mCaptureImageBitmap=null;                        
                View ve = findViewById(R.id.mainscreenGlViewRelativeLayout);
                ve.setDrawingCacheEnabled(true);
                mCaptureImageBitmap = ve.getDrawingCache();
    }

But I get an error of NullPoint exception. Please help me