BitmapFactory.decodeByteArray() is returning NULL

user_379220 0
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I am using the previewCallback from the camera to try and grab images. Here is the code I am using

private Camera.PreviewCallback mPrevCallback = new Camera.PreviewCallback() 
{
        public void onPreviewFrame( byte[] data, Camera Cam ) {
                Log.d("CombineTestActivity", "Preview started");
                Log.d("CombineTestActivity", "Data length = " 
                        + data.length );
                currentprev = BitmapFactory.decodeByteArray( data, 0, 
                        data.length );

               if( currentprev == null )
                   Log.d("CombineTestActivity", "currentprev is null" );

                Log.d("CombineTestActivity", "Preview Finished" );

        }
};

the length of the data always comes otu the same as 576000.

Also I have tried changing the parameters of the camera so the image comes back as different formats. Here is what it looks like when I do that.

mCamera = Camera.open();
camParam = mCamera.getParameters();
camParam.setPreviewFormat( ImageFormat.RGB_565 );
mCamera.setParameters( camParam );
    mCamera.setPreviewCallback( mPrevCallback );

However both when I change the preview format and when I leave it as its default of NV21, BitmapFactory.decodeByteArray comes back as null. I have also tried changing the preview format to JPEG type. I even get a debug statement in the ddms, this is what I get

"D/skia (14391): --- SkImageDecoder::Factory returned null"

camera format android image java
6 Answers

This is working for me...

 private Camera.PreviewCallback getPreviewCallback() {
    Log.d("TAG", "previewCallBack ==> " + "getPreviewCallback");
    Camera.PreviewCallback previewBitmap = new Camera.PreviewCallback() {
        @Override
        public void onPreviewFrame(byte[] data, Camera camera) {
            Camera.Size previewSize = camera.getParameters().getPreviewSize();
            YuvImage yuvimage=new YuvImage(data, ImageFormat.NV21, previewSize.width, previewSize.height, null);
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            yuvimage.compressToJpeg(new Rect(0, 0, previewSize.width, previewSize.height), 80, baos);
            byte[] jdata = baos.toByteArray();
            // Convert to Bitmap
            Bitmap bitmap = BitmapFactory.decodeByteArray(jdata, 0, jdata.length);
            Log.d("TAG", "BITMAP ==> " + bitmap);
            runModelInference(bitmap);
        }
    };

    return previewBitmap;
}
user_10450740
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