Rendering Surface Using SurfaceView and SurfaceHolder @ Story Behind Camera App

Hi .... Dear All ....  Today I am uploading a superb example of how Image render on Surface.
This concept is implemented by extending SurfaceView Class and implementing SurfaceHolder Callback Methods.
We have to use Camera of the device so add the below permission in manifest file 

<uses-permission android:name="android.permission.CAMERA" />

<uses-feature android:name="android.hardware.camera" />

SurfaceView

@ Provides a dedicated drawing surface embedded inside of a view hierarchy. 

@ One of the purposes of this class is to provide a surface in which a secondary thread can

     render into the screen.

@ One of the purposes of this class is to provide a surface in which a secondary thread can

     render into the screen.

 I am using Android Studio 1.5.1

Minimun SDK API 19
Target SDK API 23
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A. Output Will be  -  Output will render on the screen if you click it will be like 

B. Java Code 

1.    MainActivity.java will be  like 

package com.exam.ravi.surfaceviewex1;
import android.hardware.Camera;
import android.hardware.Camera.ErrorCallback;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
@SuppressWarnings("ALL")
public class MainActivity extends AppCompatActivity
{
    private static final String TAG = "RenderDemo";
    private RenderPreview renderPreview;
    @Override    public void onCreate(Bundle savedInstanceState)
     {
         super.onCreate(savedInstanceState);
         Camera camera = Camera.open();
         renderPreview = new RenderPreview(this, camera);
         renderPreview.camera.setErrorCallback(new ErrorCallback()
         {
             @Override             public void onError(int error, Camera camera)
             {
                 System.out.println("Error in camera -- " + error);
             }
         });
         setContentView(renderPreview);
     }
}

2. RenderPreview.java is like 

package com.exam.ravi.surfaceviewex1;

import android.content.Context;
import android.hardware.Camera;
import android.hardware.Camera.PreviewCallback;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import java.io.IOException;
@SuppressWarnings("ALL")
class RenderPreview extends SurfaceView implements SurfaceHolder.Callback
{
    private static final String TAG = "RenderPreview";
    SurfaceHolder surfaceHolder;
    public Camera camera;
    public byte[] cameraData;
    RenderPreview(Context context, Camera camera)
    {
        super(context);
        this.camera = camera;
        surfaceHolder = getHolder();
        surfaceHolder.addCallback(this);
        surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }
    // Called once the holder is ready

     public void surfaceCreated(SurfaceHolder holder)
     {
        // The Surface has been created, acquire the camera and tell it where  to draw.

                try {
                    camera.setPreviewDisplay(holder);
                    camera.setPreviewCallback(new PreviewCallback() {
                        // Called for each frame previewed

                    public void onPreviewFrame(byte[] data, Camera camera)
                        {
                            cameraData = data;
                            Log.d(TAG, "Size of camera Data - " + cameraData.length);
                            RenderPreview.this.invalidate();
                        }
                    });
                } catch (IOException e)
                {
                    e.printStackTrace();
                }
     }
    // Called when surface holder is destroyed
   
     public void surfaceDestroyed(SurfaceHolder holder)
    {
        holder.removeCallback(this);
    }
    // Called when surface holder has changed
    
      public void surfaceChanged(SurfaceHolder holder, int format, int w, int h)
    {
        try        {
            camera.startPreview();
        }
        catch (RuntimeException e)
        {
            Log.e("CameraPreview", "Runtime Exeption " + e.getLocalizedMessage());
        }
    }
}