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fix NullPointerException #13

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Liloveyang
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Hello,Thank you in advance for making your code public.
The exception comes from the drawBitmap method under the MainSurface class!

     @Override
      public void drawBitmap(Bitmap bitmap, Matrix matrix, Paint paint) {	
          this.paint.getGraphics().drawImage(bitmap.getImage(),((JMatrix)matrix).trans, null);
      }

When executing bitmap.getImage (), NullPointerException is caused because the bitmap is null. You should add the if module! Thank you for reading

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