public static Bitmap mergeFourImages(Bitmap img1, Bitmap img2, Bitmap img3, Bitmap img4) {try {int width = Math.max(img1.getWidth(), img2.getWidth());int height = Math.max(img1.getHeight(), img3.getHeight());Bitmap result = Bitmap.createBitmap(width * 2, height * 2, Bitmap.Config.ARGB_8888);Canvas canvas = new Canvas(result);canvas.drawBitmap(img1, 0, 0, null);canvas.drawBitmap(img2, width, 0, null);canvas.drawBitmap(img3, 0, height, null);canvas.drawBitmap(img4, width, height, null);return result;} catch (Exception e) {Log.e("vivi", "mergeFourImages error :" + e);}return null;}