Android ขอคำแนะนำ!เรื่องการ Capture หน้าจอจาก Surface View

public class MjpegSample extends Activity {
    private static final String TAG = "MjpegActivity";
    Button slideHandleButton;
    SlidingDrawer slidingDrawer;
    private MjpegView mv = null;
    private MjpegView bitmap ;
    private LinearLayout ll1;
    private LinearLayout nestedL;
    private Button btn1;
    private Bitmap bm;
    public MjpegInputStream mIn = null;
    public Button btnSaveAll ;
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);




    //sample public cam
        //String URL = "http://192.168.2.1/?action=appletvstream"; ?action=stream
        String URL = "http://trackfield.webcam.oregonstate.edu/axis-cgi/mjpg/video.cgi?resolution=800x600&amp%3bdummy=1333689998337";
        //requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);

        setContentView(R.layout.main);
        mv = (MjpegView) findViewById(R.id.mv);

       // bitmap.getBitmaps() ;
        new DoRead().execute(URL);

        Button btnSaveAll = (Button)findViewById(R.id.capture);
        btnSaveAll.setOnClickListener(new View.OnClickListener() {
                    public void onClick(View v) {

                    View view = findViewById(R.id.mv);
                    view.setDrawingCacheEnabled(true);
                   // Bitmap bm = Bitmap.createBitmap(view.getDrawingCache());
                    Bitmap bm =  bitmap.getBitmaps() ;
                    view.setDrawingCacheEnabled(false);

                    try {
                        Date d = new Date();
                        String filename  = (String)DateFormat.format("kkmmss-MMddyyyy"
                                , d.getTime());
                        File dir = new File(Environment.getExternalStorageDirectory()
                                , "/Pictures/" + filename + ".jpg");
                        FileOutputStream out = new FileOutputStream(dir);
                        ByteArrayOutputStream bos = new ByteArrayOutputStream();
                        bm.compress(Bitmap.CompressFormat.JPEG, 100, bos);
                        out.write(bos.toByteArray());
                        Toast.makeText(getApplicationContext(), "Save card!"
                                , Toast.LENGTH_SHORT).show();
                    } catch (FileNotFoundException e) {
                        e.printStackTrace();
                    }  catch (IOException e) {
                        e.printStackTrace();
                    }
                }
        });
/*        slideHandleButton = (Button) findViewById(R.id.slideHandleButton);
        slidingDrawer = (SlidingDrawer) findViewById(R.id.SlidingDrawer);

        slidingDrawer.setOnDrawerOpenListener(new OnDrawerOpenListener() {

            @Override
            public void onDrawerOpened() {
                slideHandleButton.setBackgroundResource(R.drawable.openarrow);
            }
        });

        slidingDrawer.setOnDrawerCloseListener(new OnDrawerCloseListener() {

            @Override
            public void onDrawerClosed() {
                slideHandleButton.setBackgroundResource(R.drawable.closearrow);
            }
        });
*/
    }

    public void onPause() {
        super.onPause();
        mv.stopPlayback();
    }

    public class DoRead extends AsyncTask<String, Void, MjpegInputStream> {
        protected MjpegInputStream doInBackground(String... url) {
            //TODO: if camera has authentication deal with it and don't just not work
            HttpResponse res = null;
            DefaultHttpClient httpclient = new DefaultHttpClient();
            Log.d(TAG, "1. Sending http request");
            try {
                res = httpclient.execute(new HttpGet(URI.create(url[0])));
                Log.d(TAG, "2. Request finished, status = " + res.getStatusLine().getStatusCode());
                if(res.getStatusLine().getStatusCode()==401){
                    //You must turn off camera User Access Control before this will work
                    return null;
                }
                return new MjpegInputStream(res.getEntity().getContent());
            } catch (ClientProtocolException e) {
                e.printStackTrace();
                Log.d(TAG, "Request failed-ClientProtocolException", e);
                //Error connecting to camera
            } catch (IOException e) {
                e.printStackTrace();
                Log.d(TAG, "Request failed-IOException", e);
                //Error connecting to camera
            }

            return null;
        }

        protected void onPostExecute(MjpegInputStream result) {
            mv.setSource(result);
            mv.setDisplayMode(MjpegView.SIZE_BEST_FIT);
            mv.showFps(true);
        }
    }
}

public class MjpegView extends SurfaceView implements SurfaceHolder.Callback {
    private static final String TAG = "MjpegView";

    public final static int POSITION_UPPER_LEFT = 9;
    public final static int POSITION_UPPER_RIGHT = 3;
    public final static int POSITION_LOWER_LEFT = 12;
    public final static int POSITION_LOWER_RIGHT = 6;

    public final static int SIZE_STANDARD = 1;
    public final static int SIZE_BEST_FIT = 4;
    public final static int SIZE_FULLSCREEN = 8;

    private MjpegViewThread thread;
    private MjpegInputStream mIn = null;
    private boolean showFps = false;
    private boolean mRun = false;
    private boolean surfaceDone = false;
    private Paint overlayPaint;
    private int overlayTextColor;
    private int overlayBackgroundColor;
    private int ovlPos;
    private int dispWidth;
    private int dispHeight;
    private int displayMode;

    public class MjpegViewThread extends Thread {
        private SurfaceHolder mSurfaceHolder;
        private int frameCounter = 0;
        private long start;
        private Bitmap ovl;
        public Bitmap bm;

        public MjpegViewThread(SurfaceHolder surfaceHolder, Context context) {
            mSurfaceHolder = surfaceHolder;
        }

        private Rect destRect(int bmw, int bmh) {
            int tempx;
            int tempy;
            if (displayMode == MjpegView.SIZE_STANDARD) {
                tempx = (dispWidth / 2) - (bmw / 2);
                tempy = (dispHeight / 2) - (bmh / 2);
                return new Rect(tempx, tempy, bmw + tempx, bmh + tempy);
            }
            if (displayMode == MjpegView.SIZE_BEST_FIT) {
                float bmasp = (float) bmw / (float) bmh;
                bmw = dispWidth;
                bmh = (int) (dispWidth / bmasp);
                if (bmh > dispHeight) {
                    bmh = dispHeight;
                    bmw = (int) (dispHeight * bmasp);
                }
                tempx = (dispWidth / 2) - (bmw / 2);
                tempy = (dispHeight / 2) - (bmh / 2);
                return new Rect(tempx, tempy, bmw + tempx, bmh + tempy);
            }
            if (displayMode == MjpegView.SIZE_FULLSCREEN) {
                return new Rect(0, 0, dispWidth, dispHeight);
            }
            return null;
        }

        public void setSurfaceSize(int width, int height) {
            synchronized (mSurfaceHolder) {
                dispWidth = width;
                dispHeight = height;
            }
        }

        private Bitmap makeFpsOverlay(Paint p, String text) {
            Rect b = new Rect();
            p.getTextBounds(text, 0, text.length(), b);
            int bwidth = b.width() + 2;
            int bheight = b.height() + 2;
             bm = Bitmap.createBitmap(bwidth, bheight, Bitmap.Config.ARGB_8888);
            Canvas c = new Canvas(bm);

            p.setColor(overlayBackgroundColor);
            c.drawRect(0, 0, bwidth, bheight, p);
            p.setColor(overlayTextColor);
            c.drawText(text, -b.left + 1, (bheight / 2) - ((p.ascent() + p.descent()) / 2) + 1, p);
            return bm;
        }

        public void run() {
            start = System.currentTimeMillis();
            PorterDuffXfermode mode = new PorterDuffXfermode(PorterDuff.Mode.DST_OVER);

            int width;
            int height;
            Rect destRect;
            Canvas c = null ;
            Paint p = new Paint();
            String fps;
            while (mRun) {
                if (surfaceDone) {
                    try {
                        c = mSurfaceHolder.lockCanvas();
                        synchronized (mSurfaceHolder) {
                            try {
                                bm = mIn.readMjpegFrame();
                                destRect = destRect(bm.getWidth(), bm.getHeight());
                                c.drawColor(Color.BLACK);
                                c.drawBitmap(bm, null, destRect, p);
                                if (showFps) {
                                    p.setXfermode(mode);
                                    if (ovl != null) {
                                        height = ((ovlPos & 1) == 1) ? destRect.top : destRect.bottom - ovl.getHeight();
                                        width = ((ovlPos & 8) == 8) ? destRect.left : destRect.right - ovl.getWidth();
                                        c.drawBitmap(ovl, width, height, null);
                                    }
                                    p.setXfermode(null);
                                    frameCounter++;
                                    if ((System.currentTimeMillis() - start) >= 1000) {
                                        fps = String.valueOf(frameCounter) + " fps";
                                        frameCounter = 0;
                                        start = System.currentTimeMillis();
                                        ovl = makeFpsOverlay(overlayPaint, fps);
                                    }
                                }
                            } catch (IOException e) {
                                e.getStackTrace();
                                Log.d(TAG, "catch IOException hit in run", e);
                            }
                        }
                    } finally {
                        if (c != null) {
                            mSurfaceHolder.unlockCanvasAndPost(c);
                        }
                    }
                }
            }
        }

        public Bitmap getBitmap() {
            return bm;
        }
    }

    private void init(Context context) {
        SurfaceHolder holder = getHolder();
        holder.addCallback(this);
        thread = new MjpegViewThread(holder, context);
        setFocusable(true);
        overlayPaint = new Paint();
        overlayPaint.setTextAlign(Paint.Align.LEFT);
        overlayPaint.setTextSize(12);
        overlayPaint.setTypeface(Typeface.DEFAULT);
        overlayTextColor = Color.WHITE;
        overlayBackgroundColor = Color.BLACK;
        ovlPos = MjpegView.POSITION_LOWER_RIGHT;
        displayMode = MjpegView.SIZE_STANDARD;
        dispWidth = getWidth();
        dispHeight = getHeight();
    }

    public void startPlayback() {
        if (mIn != null) {
            mRun = true;
            thread.start();
        }
    }

    public void stopPlayback() {
        mRun = false;
        boolean retry = true;
        while (retry) {
            try {
                thread.join();
                retry = false;
            } catch (InterruptedException e) {
                e.getStackTrace();
                Log.d(TAG, "catch IOException hit in stopPlayback", e);
            }
        }
    }

    public MjpegView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(context);
    }

    public void surfaceChanged(SurfaceHolder holder, int f, int w, int h) {
        thread.setSurfaceSize(w, h);
    }

    public void surfaceDestroyed(SurfaceHolder holder) {
        surfaceDone = false;
        stopPlayback();
    }

    public MjpegView(Context context) {
        super(context);
        init(context);
    }

    public void surfaceCreated(SurfaceHolder holder) {
        surfaceDone = true;
    }

    public void showFps(boolean b) {
        showFps = b;
    }

    public void setSource(MjpegInputStream source) {
        mIn = source;
        startPlayback();
    }

    public void setOverlayPaint(Paint p) {
        overlayPaint = p;
    }

    public void setOverlayTextColor(int c) {
        overlayTextColor = c;
    }

    public void setOverlayBackgroundColor(int c) {
        overlayBackgroundColor = c;
    }

    public void setOverlayPosition(int p) {
        ovlPos = p;
    }

    public void setDisplayMode(int s) {
        displayMode = s;
    }

    public Bitmap getBitmaps(){

        return thread.getBitmap();
    }
    public void saveScreenshot() {

            Bitmap bitmap = Bitmap.createBitmap(getWidth(),
                    getHeight(), Bitmap.Config.ARGB_8888);
            Canvas canvas = new Canvas(bitmap);

           // thread.run();
            File file = new File(Environment.getExternalStorageDirectory()
                    , "/Pictures/" + System.currentTimeMillis() + ".jpg");
            FileOutputStream fos;
            try {
                fos = new FileOutputStream(file);
                bitmap.compress(Bitmap.CompressFormat.JPEG, 100,
                        fos);
                fos.close();
            } catch (FileNotFoundException e) {
                Log.e("Panel", "FileNotFoundException", e);
            } catch (IOException e) {
                Log.e("Panel", "IOEception", e);
            }
        }
} 

public class MjpegInputStream extends DataInputStream {
    private static final String TAG = "MjpegInputStream";

    private final byte[] SOI_MARKER = { (byte) 0xFF, (byte) 0xD8 };
    private final byte[] EOF_MARKER = { (byte) 0xFF, (byte) 0xD9 };
    private final String CONTENT_LENGTH = "Content-Length";
    private final static int HEADER_MAX_LENGTH = 100;
    private final static int FRAME_MAX_LENGTH = 40000 + HEADER_MAX_LENGTH;
    private int mContentLength = -1;

    public MjpegInputStream(InputStream in) {
        super(new BufferedInputStream(in, FRAME_MAX_LENGTH));
    }

    private int getEndOfSeqeunce(DataInputStream in, byte[] sequence) throws IOException {
        int seqIndex = 0;
        byte c;
        for(int i=0; i < FRAME_MAX_LENGTH; i++) {
            c = (byte) in.readUnsignedByte();
            if(c == sequence[seqIndex]) {
                seqIndex++;
                if(seqIndex == sequence.length) {
                    return i + 1;
                }
            } else {
                seqIndex = 0;
            }
        }
        return -1;
    }

    private int getStartOfSequence(DataInputStream in, byte[] sequence) throws IOException {
        int end = getEndOfSeqeunce(in, sequence);
        return (end < 0) ? (-1) : (end - sequence.length);
    }

    private int parseContentLength(byte[] headerBytes) throws IOException, NumberFormatException {
        ByteArrayInputStream headerIn = new ByteArrayInputStream(headerBytes);
        Properties props = new Properties();
        props.load(headerIn);
        return Integer.parseInt(props.getProperty(CONTENT_LENGTH));
    }

    public Bitmap readMjpegFrame() throws IOException {
        mark(FRAME_MAX_LENGTH);
        int headerLen = getStartOfSequence(this, SOI_MARKER);
        reset();
        byte[] header = new byte[headerLen];
        readFully(header);
        try {
            mContentLength = parseContentLength(header);
        } catch (NumberFormatException nfe) {
            nfe.getStackTrace();
            Log.d(TAG, "catch NumberFormatException hit", nfe);
            mContentLength = getEndOfSeqeunce(this, EOF_MARKER);
        }
        reset();
        byte[] frameData = new byte[mContentLength];
        skipBytes(headerLen);
        readFully(frameData);
        return BitmapFactory.decodeStream(new ByteArrayInputStream(frameData));
    }
}