How to use camera to take picture without show camera Activity ?

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Mobile

Android

hi I need to sample for take picture from back and front camera in android !
But all sample in Web use default camera application or show preview of image to user
I crate one ! But it work on some device and get Error in some ...

package com.example.user.camera;

import android.app.Activity;
import android.content.ContentValues;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.hardware.Camera.CameraInfo;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Log;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStream;


public class MainActivity extends Activity {


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Camera camera = Camera.open();
        Camera.Parameters parameters = camera.getParameters();
        parameters.setPictureFormat(PixelFormat.JPEG);
        camera.setParameters(parameters);
        SurfaceView mview = new SurfaceView(getBaseContext());
        try {
            camera.setPreviewDisplay(mview.getHolder());
            camera.startPreview();
            camera.takePicture(null, null, photoCallback);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

  
    Camera.PictureCallback photoCallback=new Camera.PictureCallback() {
        public void onPictureTaken(byte[] data, Camera camera) {

            Uri uriTarget = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, new ContentValues());
            OutputStream imageFileOS;

            try {

                imageFileOS = getContentResolver().openOutputStream(uriTarget);
                imageFileOS.write(data);
                imageFileOS.flush();
                imageFileOS.close();

                Toast.makeText(getApplicationContext(), "Image saved: " + uriTarget.toString(), Toast.LENGTH_LONG).show();

            } catch (FileNotFoundException e) {
                e.printStackTrace();

            } catch (IOException e) {
                e.printStackTrace();

            }
            finish();

        }
    };
}