Trying to save an image from the Rasp Pi camera to a temp folder to ship it via an embedded web server - Step 1.

MainActivity.java

/**
Error:
E/AndroidRuntime: FATAL EXCEPTION: CameraThread
    Process: xxxx, PID: 2634
    java.lang.IllegalStateException: buffer has been freed
 */

private ImageReader.OnImageAvailableListener onImageAvailableListener = new ImageReader.OnImageAvailableListener()
    {
        @Override
        public void onImageAvailable(ImageReader imageReader)
        {
            try
            {
                Image image = imageReader.acquireLatestImage();
                ByteBuffer byteBuffer = image.getPlanes()[0].getBuffer();
                byteBuffer.rewind();
                image.close();

                File file = File.createTempFile("test.jpg", null, getApplicationContext().getCacheDir());

                if (!file.exists())
                {
                    file.createNewFile();
                }

                BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(file, false));
                bufferedWriter.write(byteBuffer.asCharBuffer().array());
                bufferedWriter.close();

                Log.d(TAG, "Camera image listener wrote to file: " + file.getAbsolutePath());
            }
            catch (IOException e)
            {
                Log.e(TAG, "Camera image saving failed with error; " + e.getLocalizedMessage());
            }
        }
    };