Building my own camera application + Automatically capture the image

package themiya.camera.android;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageManager;
import android.hardware.Camera;
import android.hardware.Camera.PictureCallback;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.view.View;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.Toast;

public class CameraActivity extends Activity {

private Camera mCamera;
private CameraPreview mPreview;
public static final int MEDIA_TYPE_IMAGE = 1;


@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    Button captureButton = (Button) findViewById(R.id.button_capture);
    System.out.println("Starting!");

    // Create an instance of Camera
    mCamera = getCameraInstance();
    // Create our Preview view and set it as the content of our activity.
    mPreview = new CameraPreview(this, mCamera);
    FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);
    preview.addView(mPreview);

    final PictureCallback mPicture = new PictureCallback() {

        public void onPictureTaken(byte[] data, Camera camera) {

            File pictureFile = getOutputMediaFile(MEDIA_TYPE_IMAGE);

            if (pictureFile == null){
                return;
            }

            try {
                FileOutputStream fos = new FileOutputStream(pictureFile);
                fos.write(data);
                fos.close();
                MediaStore.Images.Media.insertImage(getContentResolver(), pictureFile.getAbsolutePath(), pictureFile.getName(), pictureFile.getName());
            } catch (FileNotFoundException e) {

            } catch (IOException e) {

            }
          }
        };





 // Add a listener to the Capture button
    captureButton.setOnClickListener(

        new View.OnClickListener() {

            public void onClick(View v) {
                // get an image from the camera   

                System.out.println("Photo Taking!");
                mCamera.takePicture(null, null, mPicture);



            }
        }
    );

File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
          Environment.DIRECTORY_PICTURES), "MyCameraApp");


// This location works best if you want the created images to be shared
// between applications and persist after your app has been uninstalled.

// Create the storage directory if it does not exist
if (! mediaStorageDir.exists()){
    if (! mediaStorageDir.mkdirs()){
        return null;
    }
}

// Create a media file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
File mediaFile;
if (type == MEDIA_TYPE_IMAGE){
    mediaFile = new File(mediaStorageDir.getPath() + File.separator +
    "IMG_"+ timeStamp + ".jpg");
} else {
    return null;
}

return mediaFile;

private SurfaceHolder mHolder;
private Camera mCamera;

public CameraPreview(Context context,Camera camera) {
    super(context);
    mCamera = camera;

    /*SurfaceView view = new SurfaceView(this);
    c.setPreviewDisplay(view.getHolder());
    c.startPreview();
    c.takePicture(shutterCallback, rawPictureCallback, jpegPictureCallback);
     * */

    // Install a SurfaceHolder.Callback so we get notified when the
    // underlying surface is created and destroyed.
    mHolder = getHolder();

    mHolder.addCallback(this);
    // deprecated setting, but required on Android versions prior to 3.0
    mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);   


}

public void surfaceChanged(SurfaceHolder holder, int format, int width,
        int height) {
    // TODO Auto-generated method stub

    if (mHolder.getSurface() == null){
        // preview surface does not exist
        return;
      }

      // stop preview before making changes
      try {
          mCamera.stopPreview();
      } catch (Exception e){
        // ignore: tried to stop 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();

      } catch (Exception e){

      }

}

public void surfaceCreated(SurfaceHolder holder) {
    // TODO Auto-generated method stub

}

public void surfaceDestroyed(SurfaceHolder holder) {
    // TODO Auto-generated method stub

}

        new View.OnClickListener() {

            public void onClick(View v) {
                    // get an image from the camera   

                System.out.println("Photo Taking!");
                mCamera.takePicture(null, null, mPicture);



            }
        }
    );