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OpenCV can convert YUV420sp (aka NV21) to RGBA_8888 that should also be OK on Android.

May mYuv = new Mat(h + h/2, w, CvType.CV_8UC1);
mYuv.put(0, 0, mYUVData);
Mat mRgba = new Mat();
Imgproc.cvtColor( mYuv, mRgba, Imgproc.COLOR_YUV420sp2RGBA );