import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.util.Log;
import android.view.KeyEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;


public class PreView extends SurfaceView implements SurfaceHolder.Callback {

    private SurfaceHolder holder = null;
    private Camera mCamera = null;
    private Bitmap mBitmap = null;

    public PreView(Context context) {
        super(context);
        Log.i("TAG", "PreView()");
        // TODO Auto-generated constructor stub
        holder = this.getHolder();
        holder.addCallback(this);
        holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }

    public void surfaceChanged(SurfaceHolder holder, int format, int width,
            int height) {
        Log.i("TAG", "surfaceChanged");
        // TODO Auto-generated method stub
        Camera.Parameters parameters = mCamera.getParameters();
        parameters.setPictureFormat(PixelFormat.JPEG);
        parameters.setPreviewSize(320, 480);
//      parameters.setPictureSize(320, 480);
        mCamera.setParameters(parameters);
        mCamera.startPreview();
    }

    public void surfaceCreated(SurfaceHolder holder) {
        Log.i("TAG", "surfaceCreated");
        // TODO Auto-generated method stub
        mCamera = Camera.open();
        try {
            mCamera.setPreviewDisplay(holder);
        } catch (IOException e) {
            mCamera.release();
            mCamera = null;
        }
    }

    public void surfaceDestroyed(SurfaceHolder holder) {
        Log.i("TAG", "surfaceDestroyed");
        // TODO Auto-generated method stub
        mCamera.stopPreview();
        mCamera = null;
    }

    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if(keyCode==KeyEvent.KEYCODE_DPAD_CENTER){
            if(mCamera !=null){
                mCamera.takePicture(null, null,pic);
            }
        }
        return super.onKeyDown(keyCode, event);
    }

    public Camera.PictureCallback pic = new Camera.PictureCallback(){

        public void onPictureTaken(byte[] data, Camera camera) {
            // TODO Auto-generated method stub
            mBitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
            File f = new File(android.os.Environment.getExternalStorageDirectory()+"/camera1.jpg");
            try {
                BufferedOutputStream os = new BufferedOutputStream(new FileOutputStream(f));
                mBitmap.compress(Bitmap.CompressFormat.JPEG, 80, os);
                os.flush();
                os.close();
                Canvas canvas = holder.lockCanvas();
                canvas.drawBitmap(mBitmap, 0, 0, null);
                holder.unlockCanvasAndPost(canvas);
            } catch (FileNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

    };
}





///**************************************************CameraApplication

import android.app.Activity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.Window;

public class CameraApplication extends Activity {
    /** Called when the activity is first created. */
    private PreView pv = null;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        pv = new PreView(this);
        setContentView(pv);
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        // TODO Auto-generated method stub
        return pv.onKeyDown(keyCode, event);
    }

}




///****************************************************AndroidManifest XML:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.camapp"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />

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

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".CameraApplication"
            android:label="@string/title_activity_starting" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>