import java.io.FileOutputStream;


import android.content.Context;

import android.hardware.Camera;

import android.os.Environment;

import android.view.MotionEvent;

import android.view.SurfaceHolder;

import android.view.SurfaceView;


public class CameraView extends SurfaceView implements SurfaceHolder.Callback, Camera.PictureCallback {

    private SurfaceHolder holder;

    private Camera camera;

    private 
 
boolean af;


    public CameraView(Context context) {//建構函式        super(context);


        holder = getHolder();//生成Surface Holder        holder.addCallback(this);


        holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);//指定Push Buffer    }


    public void surfaceCreated(SurfaceHolder holder) {//Surface生成事件的處理
 
try {

            camera = Camera.open();//攝像頭的初始化            camera.setPreviewDisplay(holder);

        } catch (Exception e) {

        }

    }


    @Override

    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {//Surface改變事件的處理        Camera.Parameters parameters = camera.getParameters();

        parameters.setPreviewSize(width, height);

        camera.setParameters(parameters);
 
//設定引數        camera.startPreview();//開始預覽    }


    public void surfaceDestroyed(SurfaceHolder holder) {//Surface銷燬時的處理        camera.setPreviewCallback(null);

        camera.stopPreview();

        camera.release();

        camera =null;

    }


    @Override

    public boolean onTouchEvent(MotionEvent event) {//螢幕觸控事件if (event.getAction() == MotionEvent.ACTION_DOWN) {//按下時自動對焦            camera.autoFocus(null);

            af =true;

        }
if (event.getAction() == MotionEvent.ACTION_UP && af ==true) {//放開後拍照            camera.takePicture(null, null, this);

            af =false;

        }
returntrue;

    }


    public void onPictureTaken(byte[] data, Camera camera) {//拍攝完成後儲存照片try {

            String path = Environment.getExternalStorageDirectory() +"/test.jpg";

            data2file(data, path);

        } catch (Exception e) {

        }

        camera.startPreview();

    }


    private void data2file(byte[] w, String fileName) throws Exception {//將二進位制資料轉換為檔案的函式        FileOutputStream out =null;
try {

            out =new FileOutputStream(fileName);

            out.write(w);

            out.close();

        } catch (Exception e) {
if (out !=null)

                out.close();
throw e;

        }

    }


}