How can I make a SurfaceView larger than the screen?

Question

I would like to effectively make a simple digital zoom for the camera preview, so I thought I would simply resize my SurfaceView to be larger than the screen. Other questio

Answer 1

You can't make your surfaceView bigger than the screen. That being said there are ways around it.

I found you can adjust the size of the canvas in the SurfaceView, which will allow zooming.

public class DrawingThread extends Thread {
private MagnificationView mainPanel;
private SurfaceHolder surfaceHolder;
private boolean run;

public DrawingThread(SurfaceHolder surface, MagnificationView panel){
    surfaceHolder = surface;
    mainPanel = panel;
}

public SurfaceHolder getSurfaceHolder(){
    return surfaceHolder;
}

public void setRunning (boolean run){
    this.run = run;
}

public void run(){
    Canvas c;
    while (run){
        c = null;
        try {
            c = surfaceHolder.lockCanvas(null);
            synchronized (surfaceHolder){
                mainPanel.OnDraw(c);
            }
        } finally {
            if (c != null){
                surfaceHolder.unlockCanvasAndPost(c);
            }
        }
    }
}

}

In the MagnificationView class add a method:

public void OnDraw(Canvas canvas){
    if (canvas!=null){
        canvas.save();
        canvas.scale(scaleX,scaleY);      

        canvas.restore();
    }
}

DrawingThread would be a thread you start in in your Activity. Also in your MagnificationView class override the OnTouchEvent to handle your own pinch-zoom (which will modify scaleX & scaleY.

Hope This solves your issue