Question

Is there is any way to set pixels on cameraPreview, like getting pixel or some other ways?
My requirement: I want to put some pixels on a particular positions on camera preview or convert some pixel value of some points in camera preview into another value.

Answer 1

I have solved this issue by placing a custom view in front of the surface view, on each PreviewCallback I draw an image and set it as background of that custom view. It feels drawing pixels on camera preview. I dont know this is the actual method, if I get optimal solution I will update here

Custom view

public class DrawOnTop  extends View {

public DrawOnTop(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
}}

Create camera activity implements PreviewCallback
To set custom view infront of surfaceview

DrawOnTop mDraw = new DrawOnTop(this);
    addContentView(mDraw, new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));

In onPreviewFrame you can do code for creating image according to preview display and set that image as background of the custom view.

@Override  
public void onPreviewFrame(byte[] data, Camera camera) {  
    //your code
}