SimpleCameraPreview.java

@Override

 public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
     // If your preview can change or rotate, take care of those events here.
     // Make sure to stop the preview before resizing or reformatting it.
     if (mHolder.getSurface() == null) {
         // preview surface does not exist
         Log.d(TAG, "Preview Surface does not exist");
         return;
     }

     // stop preview before making changes
     try {
         mCamera.stopPreview();
         Log.d(TAG, "Camera Stopped Successfully");
     } catch (Exception e) {
         Log.d(TAG, "Error Stopping Camera, it most likely is a non-existent preview");
     }

     // set preview size and make any resize, rotate or
     // reformatting changes here
     // start preview with new settings
     try {
         mCamera.setPreviewDisplay(mHolder);
         mCamera.startPreview();
         Log.d(TAG, "Preview Started Successfully");
     } catch (Exception e) {
         Log.d(TAG, "Error starting camera preview: " + e.getMessage());
     }
 }