Question 128353 in Android Studio Question posted in
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Android Studio – View.getDrawingCache() always return Black area in Bitmap for transparent PNG. Can we change Tranparent Black Area to White Color in Bitmap?

I have a method for screenshot which takes the View from XML and convert to Bitmap object, and I have multiple PNG on layout View. Some PNG have transparent Area which appears as Black color in Bitmap (which i want to change to White) or want to get rid of Black transparent area.

private void takescreenshot(LinearLayout preview) throws IOException
{
    View z  = preview;   // get whole layout view
    z.setDrawingCacheEnabled(true);
    Bitmap bitmap = Bitmap.createBitmap(z.getDrawingCache());
    z.destroyDrawingCache();
}
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2

Answers


  1. Chosen as BEST ANSWER
    0

    finally i figure out the solution as well

    View z  = preview;   // get whole layout view
        z.setDrawingCacheEnabled(true);
        Bitmap bitmap = Bitmap.createBitmap(z.getDrawingCache());
        z.destroyDrawingCache();

Bitmap newBitmap = Bitmap.createBitmap(bitmap.getWidth(),bitmap.getHeight(),ARGB_8888);
        newBitmap.eraseColor(Color.WHITE);
        Canvas canvas2 = new Canvas(newBitmap);
        canvas2.drawBitmap(bitmap,0F,0F,null);

  2. 0

    create a new blank bitmap
    create canvas object
    fill the canvas a background
    put old bitmap in your canvas.

    Bitmap newBitmap = Bitmap.create(bitmap.width,bitmap.height,ARGB_8888)
Canvas canvas = new Canvas(newBitmap)
canvas.drawColor(Color.white)
canvas.drawBitmap(bitmap,0F,0F,null)
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