Warning, this is messy proof of concept code. Thanks to this: http://stackoverflow.com/questions/8350230/android-how-to-display-camera-preview-with-callback

package com.apress.proandroidmedia.ch2.snapshot;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Iterator;
import java.util.List;

import android.app.Activity;
import android.content.ContentValues;
import android.content.res.Configuration;
import android.graphics.Bitmap;
import android.hardware.Camera;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore.Images.Media;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.Toast;

public class SnapShot extends Activity implements OnClickListener,
		SurfaceHolder.Callback, Camera.PictureCallback, Camera.PreviewCallback {

	SurfaceView cameraView;
	SurfaceHolder surfaceHolder;
	Camera camera;
	ImageView imgView;
	
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		setContentView(R.layout.main);

		cameraView = (SurfaceView) this.findViewById(R.id.CameraView);
		surfaceHolder = cameraView.getHolder();
		surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
		surfaceHolder.addCallback(this);

		cameraView.setFocusable(true);
		cameraView.setFocusableInTouchMode(true);
		cameraView.setClickable(true);

		cameraView.setOnClickListener(this);
		
		imgView = (ImageView) this.findViewById(R.id.ImageView);
	}

	public void onClick(View v) {
		//camera.takePicture(null, null, this);
		camera.setOneShotPreviewCallback(this);
	}

	public void onPictureTaken(byte[] data, Camera camera) {
		Uri imageFileUri = getContentResolver().insert(
				Media.EXTERNAL_CONTENT_URI, new ContentValues());
		try {
			OutputStream imageFileOS = getContentResolver().openOutputStream(
					imageFileUri);
			imageFileOS.write(data);
			imageFileOS.flush();
			imageFileOS.close();
		} catch (FileNotFoundException e) {
			Toast t = Toast.makeText(this, e.getMessage(), Toast.LENGTH_SHORT);
			t.show();
		} catch (IOException e) {
			Toast t = Toast.makeText(this, e.getMessage(), Toast.LENGTH_SHORT);
			t.show();
		}
		camera.startPreview();
	}

	public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
		camera.startPreview();
	}

	public void surfaceCreated(SurfaceHolder holder) {
		camera = Camera.open();
		try {
			camera.setPreviewDisplay(holder);
			Camera.Parameters parameters = camera.getParameters();
			if (this.getResources().getConfiguration().orientation != Configuration.ORIENTATION_LANDSCAPE) {
				parameters.set("orientation", "portrait");

				// For Android Version 2.2 and above
				camera.setDisplayOrientation(90);

				// For Android Version 2.0 and above
				parameters.setRotation(90);
			}

			parameters.setExposureCompensation(parameters.getMinExposureCompensation());
			
			// Effects are for Android Version 2.0 and higher
			List colorEffects = parameters.getSupportedColorEffects();
			Iterator cei = colorEffects.iterator();
			while (cei.hasNext()) {
				String currentEffect = cei.next();
				if (currentEffect.equals(Camera.Parameters.EFFECT_SOLARIZE)) {
					parameters
							.setColorEffect(Camera.Parameters.EFFECT_SOLARIZE);
					break;
				}
			}
			// End Effects for Android Version 2.0 and higher

			camera.setParameters(parameters);
		} catch (IOException exception) {
			camera.release();
		}
	}

	public void surfaceDestroyed(SurfaceHolder holder) {
		camera.stopPreview();
		camera.release();
	}
	
	public void onPreviewFrame(byte[] data, Camera camera) {
		int height = camera.getParameters().getPreviewSize().height;
		int width = camera.getParameters().getPreviewSize().width;
		
	    int frameSize = width*height;
	    int[] rgba = new int[frameSize+1];

	    // Convert YUV to RGB
	    for (int i = 0; i < height; i++)
	        for (int j = 0; j < width; j++) {
	            int y = (0xff & ((int) data[i * width + j]));
	            int u = (0xff & ((int) data[frameSize + (i >> 1) * width + (j & ~1) + 0]));
	            int v = (0xff & ((int) data[frameSize + (i >> 1) * width + (j & ~1) + 1]));
	            y = y < 16 ? 16 : y;

	            int r = Math.round(1.164f * (y - 16) + 1.596f * (v - 128));
	            int g = Math.round(1.164f * (y - 16) - 0.813f * (v - 128) - 0.391f * (u - 128));
	            int b = Math.round(1.164f * (y - 16) + 2.018f * (u - 128));

	            r = r < 0 ? 0 : (r > 255 ? 255 : r);
	            g = g < 0 ? 0 : (g > 255 ? 255 : g);
	            b = b < 0 ? 0 : (b > 255 ? 255 : b);

	            rgba[i * width + j] = 0xff000000 + (b << 16) + (g << 8) + r;
	        }

	    Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
	    bmp.setPixels(rgba, 0/* offset */, width /* stride */, 0, 0, width, height);
	    imgView.setImageBitmap(bmp);
	}

} // End the Activity