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Camera without preview in android


Camera sample program without preview/How to take photo without a preview in android program

package com.sample

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.os.Bundle;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.widget.ImageView;

public class TakePicture extends Activity implements SurfaceHolder.Callback
{
      //a variable to store a reference to the Image View at the main.xml file
      private ImageView iv_image;
      //a variable to store a reference to the Surface View at the main.xml file
    private SurfaceView sv;
   
    //a bitmap to display the captured image
      private Bitmap bmp;
     
      //Camera variables
      //a surface holder
      private SurfaceHolder sHolder; 
      //a variable to control the camera
      private Camera mCamera;
      //the camera parameters
      private Parameters parameters;

     
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       
        //get the Image View at the main.xml file
        iv_image = (ImageView) findViewById(R.id.imageView);
       
        //get the Surface View at the main.xml file
        sv = (SurfaceView) findViewById(R.id.surfaceView);
       
        //Get a surface
        sHolder = sv.getHolder();
       
        //add the callback interface methods defined below as the Surface   View callbacks
        sHolder.addCallback(this);
       
        //tells Android that this surface will have its data constantly replaced
        sHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }


      public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3)
      {
             //get camera parameters
             parameters = mCamera.getParameters();
             
             //set camera parameters
           mCamera.setParameters(parameters);
           mCamera.startPreview();
          
           //sets what code should be executed after the picture is taken
           Camera.PictureCallback mCall = new Camera.PictureCallback()
           {
           
             public void onPictureTaken(byte[] data, Camera camera)
             {
                   //decode the data obtained by the camera into a Bitmap
                   bmp = BitmapFactory.decodeByteArray(data, 0, data.length);
                   //set the iv_image
                   iv_image.setImageBitmap(bmp);
                   FileOutputStream outStream = null;
                        try{
                            outStream = new FileOutputStream("/sdcard/Image"+System.currentTimeMillis()+".jpg");
                            outStream.write(data);
                            outStream.close();
                        } catch (FileNotFoundException e){
                            Log.d("CAMERA", e.getMessage());
                        } catch (IOException e){
                            Log.d("CAMERA", e.getMessage());
                        }
             }
           };
          
           mCamera.takePicture(null, null, mCall);
      }


      public void surfaceCreated(SurfaceHolder holder)
      {
            // The Surface has been created, acquire the camera and tell it where
        // to draw the preview.
        mCamera = Camera.open();
        try {
           mCamera.setPreviewDisplay(holder);
           
        } catch (IOException exception) {
            mCamera.release();
            mCamera = null;
        }
      }


      public void surfaceDestroyed(SurfaceHolder holder)
      {
            //stop the preview
            mCamera.stopPreview();
            //release the camera
        mCamera.release();
        //unbind the camera from this object
        mCamera = null;
      } 
}


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
                  <SurfaceView
                  android:id="@+id/surfaceView"
                  android:layout_height="match_parent"
                  android:layout_width="match_parent">
                  </SurfaceView>
                  <ImageView
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:id="@+id/imageView">
                  </ImageView>
</LinearLayout>


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