[android help] Keeping preview callback while recording video?

You can try this answer:

public class CameraPreview implements SurfaceHolder.Callback,
        Camera.PreviewCallback {
    int PreviewSizeWidth;
    int PreviewSizeHeight;
    SurfaceHolder mSurfHolder;
    Camera mCamera;

    public CameraPreview(int PreviewlayoutWidth, int PreviewlayoutHeight) {
        PreviewSizeWidth = PreviewlayoutWidth;
        PreviewSizeHeight = PreviewlayoutHeight;
    }



    @Override
    public void onPreviewFrame(byte[] data, Camera camera) {
        Parameters p = camera.getParameters();  
        int width = p.getPreviewSize().width;
        int height = p.getPreviewSize().height;

        ByteArrayOutputStream outstr = new ByteArrayOutputStream();
        Rect rect = new Rect(0, 0, width, height);
        YuvImage yuvimage = new YuvImage(data, ImageFormat.NV21, width,
                height, null);
        yuvimage.compressToJpeg(rect, 80, outstr); // outstr contains image in jpeg  
        String encodedImage = Base64.encodeToString(
                outstr.toByteArray(), Base64.DEFAULT); // this is base64 encoding of image


    }

    @Override
    public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
        Parameters parameters;
        mSurfHolder = arg0;

        parameters = mCamera.getParameters();
        parameters.setPreviewSize(PreviewSizeWidth, PreviewSizeHeight);

        mCamera.setParameters(parameters);
        mCamera.startPreview();
    }

    public void surfaceCreated(SurfaceHolder arg0) {
        mCamera = Camera.open();
        try {
            // If did not set the SurfaceHolder, the preview area will be black.
            mCamera.setPreviewDisplay(arg0);
            mCamera.setPreviewCallback(this);
            Parameters p = mCamera.getParameters();
            p.setPreviewSize(PreviewSizeWidth, PreviewSizeHeight);
            mCamera.setParameters(p);
        } catch (IOException e) {
            mCamera.release();
            mCamera = null;
        }
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder arg0) {
        mCamera.setPreviewCallback(null);
        mCamera.stopPreview();
        mCamera.release();
        mCamera = null;
    }
}

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