Why Bitmap to Base64 String showing black background on webview in android?

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The JPEG format does not support alpha transparency, which is why the transparent background becomes black when you convert your original image to JPEG.

Use the PNG format instead:

 map1.compress(Bitmap.CompressFormat.PNG, 100, baos);

and

String imgTag = "<img src="data:image/png;base64," + imgToString               
    + "" align='left' bgcolor="ff0000"/>";

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