圖片壓縮的工具類，圖片壓縮工具類

圖片壓縮的工具類，圖片壓縮工具類

比如，項目中調用相，返回一張圖片一眼看過去，就是放大後才有區別。

1. 項目中用到的的代碼

// 從SD卡裡直接獲取Bitmap
    private Bitmap getDiskBitmap(String pathString) {
        Bitmap bitmap = null;
        try {
            File file = new File(pathString);
            if (file.exists()) {
                bitmap = BitmapFactory.decodeFile(pathString);
            }
        } catch (Exception e) {
            // TODO: handle exception
        }

        return bitmap;
    }

// 轉換成64位的Bitmap
    public static String bitmapToBase64(Bitmap bitmap) {

        String result = null;
        ByteArrayOutputStream baos = null;
        try {
            if (bitmap != null) {
                baos = new ByteArrayOutputStream();
                bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);

                baos.flush();
                baos.close();

                byte[] bitmapBytes = baos.toByteArray();
                result = Base64.encodeToString(bitmapBytes, Base64.DEFAULT);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (baos != null) {
                    baos.flush();
                    baos.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return result;
    }

// 裁剪
    public static Bitmap imageCrop(Bitmap bitmap, int num1, int num2,
            boolean isRecycled) {
        if (bitmap == null) {
            return null;
        }
        int w = bitmap.getWidth(); // 得到圖片的寬，高
        int h = bitmap.getHeight();
        int retX, retY;
        int nw, nh;
        if (w > h) {
            if (h > w * num2 / num1) {
                nw = w;
                nh = w * num2 / num1;
                retX = 0;
                retY = (h - nh) / 2;
            } else {
                nw = h * num1 / num2;
                nh = h;
                retX = (w - nw) / 2;
                retY = 0;
            }
        } else {
            if (w > h * num2 / num1) {
                nh = h;
                nw = h * num2 / num1;
                retY = 0;
                retX = (w - nw) / 2;
            } else {
                nh = w * num1 / num2;
                nw = w;
                retY = (h - nh) / 2;
                retX = 0;
            }
        }
        Bitmap bmp = Bitmap.createBitmap(bitmap, retX, retY, nw, nh, null,
                false);
        if (isRecycled && bitmap != null && !bitmap.equals(bmp)
                && !bitmap.isRecycled()) {
            bitmap.recycle();// 回收原圖片
            bitmap = null;
        }
        return bmp;
    }

private void encode() {

        File file = new File(Environment.getExternalStorageDirectory(),"famous_bitmap_painting.jpg");
        try {
            if (file.exists()) {
                file.delete();
            }
            file.createNewFile();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        String imgPath = getIntent().getStringExtra("famousPicturePath");
        //圖片的地址imgBitmapPath
        String imgBitmapPath = file.getPath().toString();
        try {
            ImageUtils.createImageThumbnail(getApplicationContext(), imgPath,
                    imgBitmapPath, 500, 100);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        //bitmap  ---createImageThumbnail工具類裁剪後處理後的圖片

        Bitmap bitmap = getDiskBitmap(imgBitmapPath);            
        if (bitmap != null) {

           //bitmap ---imageCrop類裁剪後處理後的圖片       

            Bitmap bitmap2 = imageCrop(bitmap, 500, 500, false);
            search_img.setImageBitmap(bitmap2);

//bitmap 轉成---64位字節 

            String base64 = bitmapToBase64(bitmap);
         
        }

    }

2. 重點是這個工具類，其中大部分無用的，有用的可以直接

public class ImageUtils {

    public final static String SDCARD_MNT = "/mnt/sdcard";
    public final static String SDCARD = "/sdcard";

    /** 請求相冊 */
    public static final int REQUEST_CODE_GETIMAGE_BYSDCARD = 0;
    /** 請求相機 */
    public static final int REQUEST_CODE_GETIMAGE_BYCAMERA = 1;
    /** 請求裁剪 */
    public static final int REQUEST_CODE_GETIMAGE_BYCROP = 2;
    public static final int REQUEST_CODE_GETIMAGE_IMAGEPAVER = 3;

    /**
     * 寫圖片文件 在Android系統中，文件保存在 /data/data/PACKAGE_NAME/files 目錄下
     * 
     * @throws IOException
     */
    public static void saveImage(Context context, String fileName, Bitmap bitmap)
            throws IOException {
        saveImage(context, fileName, bitmap, 100);
    }

    public static void saveImage(Context context, String fileName,
            Bitmap bitmap, int quality) throws IOException {
        if (bitmap == null || fileName == null || context == null)
            return;

        FileOutputStream fos = context.openFileOutput(fileName,
                Context.MODE_PRIVATE);
        ByteArrayOutputStream stream = new ByteArrayOutputStream();
        bitmap.compress(CompressFormat.JPEG, quality, stream);
        byte[] bytes = stream.toByteArray();
        fos.write(bytes);
        fos.close();
    }

    /**
     * 寫圖片文件到SD卡
     * 
     * @throws IOException
     */
    public static void saveImageToSD(Context ctx, String filePath,
            Bitmap bitmap, int quality) throws IOException {
        if (bitmap != null) {
            File file = new File(filePath.substring(0,
                    filePath.lastIndexOf(File.separator)));
            if (!file.exists()) {
                file.mkdirs();
            }
            BufferedOutputStream bos = new BufferedOutputStream(
                    new FileOutputStream(filePath));
            bitmap.compress(CompressFormat.JPEG, quality, bos);
            bos.flush();
            bos.close();
            if (ctx != null) {
                scanPhoto(ctx, filePath);
            }
        }
    }

    public static void saveBackgroundImage(Context ctx, String filePath,
            Bitmap bitmap, int quality) throws IOException {
        if (bitmap != null) {
            File file = new File(filePath.substring(0,
                    filePath.lastIndexOf(File.separator)));
            if (!file.exists()) {
                file.mkdirs();
            }
            BufferedOutputStream bos = new BufferedOutputStream(
                    new FileOutputStream(filePath));
            bitmap.compress(CompressFormat.PNG, quality, bos);
            bos.flush();
            bos.close();
            if (ctx != null) {
                scanPhoto(ctx, filePath);
            }
        }
    }

    /**
     * 讓Gallery上能馬上看到該圖片
     */
    private static void scanPhoto(Context ctx, String imgFileName) {
        Intent mediaScanIntent = new Intent(
                Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
        File file = new File(imgFileName);
        Uri contentUri = Uri.fromFile(file);
        mediaScanIntent.setData(contentUri);
        ctx.sendBroadcast(mediaScanIntent);
    }

    /**
     * 獲取bitmap
     * 
     * @param context
     * @param fileName
     * @return
     */
    public static Bitmap getBitmap(Context context, String fileName) {
        FileInputStream fis = null;
        Bitmap bitmap = null;
        try {
            fis = context.openFileInput(fileName);
            bitmap = BitmapFactory.decodeStream(fis);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (OutOfMemoryError e) {
            e.printStackTrace();
        } finally {
            try {
                fis.close();
            } catch (Exception e) {
            }
        }
        return bitmap;
    }

    /**
     * 獲取bitmap
     * 
     * @param filePath
     * @return
     */
    public static Bitmap getBitmapByPath(String filePath) {
        return getBitmapByPath(filePath, null);
    }

    public static Bitmap getBitmapByPath(String filePath,
            BitmapFactory.Options opts) {
        FileInputStream fis = null;
        Bitmap bitmap = null;
        try {
            File file = new File(filePath);
            fis = new FileInputStream(file);
            bitmap = BitmapFactory.decodeStream(fis, null, opts);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (OutOfMemoryError e) {
            e.printStackTrace();
        } finally {
            try {
                fis.close();
            } catch (Exception e) {
            }
        }
        return bitmap;
    }

    /**
     * 獲取bitmap
     * 
     * @param file
     * @return
     */
    public static Bitmap getBitmapByFile(File file) {
        FileInputStream fis = null;
        Bitmap bitmap = null;
        try {
            fis = new FileInputStream(file);
            bitmap = BitmapFactory.decodeStream(fis);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (OutOfMemoryError e) {
            e.printStackTrace();
        } finally {
            try {
                fis.close();
            } catch (Exception e) {
            }
        }
        return bitmap;
    }

    /**
     * 使用當前時間戳拼接一個唯一的文件名
     * 
     * @param format
     * @return
     */
    public static String getTempFileName() {
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd_HH-mm-ss_SS");
        String fileName = format.format(new Timestamp(System
                .currentTimeMillis()));
        return fileName;
    }

    /**
     * 獲取照相機使用的目錄
     * 
     * @return
     */
    public static String getCamerPath() {
        return Environment.getExternalStorageDirectory() + File.separator
                + "FounderNews" + File.separator;
    }

    /**
     * 判斷當前Url是否標准的content://樣式，如果不是，則返回絕對路徑
     * 
     * @param uri
     * @return
     */
    public static String getAbsolutePathFromNoStandardUri(Uri mUri) {
        String filePath = null;

        String mUriString = mUri.toString();
        mUriString = Uri.decode(mUriString);

        String pre1 = "file://" + SDCARD + File.separator;
        String pre2 = "file://" + SDCARD_MNT + File.separator;

        if (mUriString.startsWith(pre1)) {
            filePath = Environment.getExternalStorageDirectory().getPath()
                    + File.separator + mUriString.substring(pre1.length());
        } else if (mUriString.startsWith(pre2)) {
            filePath = Environment.getExternalStorageDirectory().getPath()
                    + File.separator + mUriString.substring(pre2.length());
        }
        return filePath;
    }

    /**
     * 通過uri獲取文件的絕對路徑
     * 
     * @param uri
     * @return
     */
    @SuppressWarnings("deprecation")
    public static String getAbsoluteImagePath(Activity context, Uri uri) {
        String imagePath = "";
        String[] proj = { MediaStore.Images.Media.DATA };
        Cursor cursor = context.managedQuery(uri, proj, // Which columns to
                                                        // return
                null, // WHERE clause; which rows to return (all rows)
                null, // WHERE clause selection arguments (none)
                null); // Order-by clause (ascending by name)

        if (cursor != null) {
            int column_index = cursor
                    .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
            if (cursor.getCount() > 0 && cursor.moveToFirst()) {
                imagePath = cursor.getString(column_index);
            }
        }

        return imagePath;
    }

    /**
     * 獲取圖片縮略圖 只有Android2.1以上版本支持
     * 
     * @param imgName
     * @param kind
     *            MediaStore.Images.Thumbnails.MICRO_KIND
     * @return
     */
    @SuppressWarnings("deprecation")
    public static Bitmap loadImgThumbnail(Activity context, String imgName,
            int kind) {
        Bitmap bitmap = null;

        String[] proj = { MediaStore.Images.Media._ID,
                MediaStore.Images.Media.DISPLAY_NAME };

        Cursor cursor = context.managedQuery(
                MediaStore.Images.Media.EXTERNAL_CONTENT_URI, proj,
                MediaStore.Images.Media.DISPLAY_NAME + "='" + imgName + "'",
                null, null);

        if (cursor != null && cursor.getCount() > 0 && cursor.moveToFirst()) {
            ContentResolver crThumb = context.getContentResolver();
            BitmapFactory.Options options = new BitmapFactory.Options();
            options.inSampleSize = 1;
            // bitmap = MethodsCompat.getThumbnail(crThumb, cursor.getInt(0),
            // kind, options);
        }
        return bitmap;
    }

    public static Bitmap loadImgThumbnail(String filePath, int w, int h) {
        Bitmap bitmap = getBitmapByPath(filePath);
        return zoomBitmap(bitmap, w, h);
    }

    /**
     * 獲取SD卡中最新圖片路徑
     * 
     * @return
     */
    public static String getLatestImage(Activity context) {
        String latestImage = null;
        String[] items = { MediaStore.Images.Media._ID,
                MediaStore.Images.Media.DATA };
        Cursor cursor = context.managedQuery(
                MediaStore.Images.Media.EXTERNAL_CONTENT_URI, items, null,
                null, MediaStore.Images.Media._ID + " desc");

        if (cursor != null && cursor.getCount() > 0) {
            cursor.moveToFirst();
            for (cursor.moveToFirst(); !cursor.isAfterLast(); cursor
                    .moveToNext()) {
                latestImage = cursor.getString(1);
                break;
            }
        }

        return latestImage;
    }

    /**
     * 計算縮放圖片的寬高
     * 
     * @param img_size
     * @param square_size
     * @return
     */
    public static int[] scaleImageSize(int[] img_size, int square_size) {
        if (img_size[0] <= square_size && img_size[1] <= square_size)
            return img_size;
        double ratio = square_size
                / (double) Math.max(img_size[0], img_size[1]);
        return new int[] { (int) (img_size[0] * ratio),
                (int) (img_size[1] * ratio) };
    }

    /**
     * 創建縮略圖
     * 
     * @param context
     * @param largeImagePath
     *            原始大圖路徑
     * @param thumbfilePath
     *            輸出縮略圖路徑
     * @param square_size
     *            輸出圖片寬度
     * @param quality
     *            輸出圖片質量
     * @throws IOException
     */
    public static void createImageThumbnail(Context context,
            String largeImagePath, String thumbfilePath, int square_size,
            int quality) throws IOException {
        BitmapFactory.Options opts = new BitmapFactory.Options();
        opts.inSampleSize = 1;
        // 原始圖片bitmap
        Bitmap cur_bitmap = getBitmapByPath(largeImagePath, opts);
        if (cur_bitmap == null)
            return;

        // 原始圖片的高寬
        int[] cur_img_size = new int[] { cur_bitmap.getWidth(),
                cur_bitmap.getHeight() };
        // 計算原始圖片縮放後的寬高
        int[] new_img_size = scaleImageSize(cur_img_size, square_size);
        // 生成縮放後的bitmap
        Bitmap thb_bitmap = zoomBitmap(cur_bitmap, new_img_size[0],
                new_img_size[1]);
        // 生成縮放後的圖片文件
        saveImageToSD(null, thumbfilePath, thb_bitmap, quality);
    }

    /**
     * 放大縮小圖片
     * 
     * @param bitmap
     * @param w
     * @param h
     * @return
     */
    public static Bitmap zoomBitmap(Bitmap bitmap, int w, int h) {
        Bitmap newbmp = null;
        if (bitmap != null) {
            int width = bitmap.getWidth();
            int height = bitmap.getHeight();
            Matrix matrix = new Matrix();
            float scaleWidht = ((float) w / width);
            float scaleHeight = ((float) h / height);
            matrix.postScale(scaleWidht, scaleHeight);
            newbmp = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix,
                    true);
        }
        return newbmp;
    }

    public static Bitmap scaleBitmap(Bitmap bitmap) {
        // 獲取這個圖片的寬和高
        int width = bitmap.getWidth();
        int height = bitmap.getHeight();
        // 定義預轉換成的圖片的寬度和高度
        int newWidth = 200;
        int newHeight = 200;
        // 計算縮放率，新尺寸除原始尺寸
        float scaleWidth = ((float) newWidth) / width;
        float scaleHeight = ((float) newHeight) / height;
        // 創建操作圖片用的matrix對象
        Matrix matrix = new Matrix();
        // 縮放圖片動作
        matrix.postScale(scaleWidth, scaleHeight);
        // 旋轉圖片 動作
        // matrix.postRotate(45);
        // 創建新的圖片
        Bitmap resizedBitmap = Bitmap.createBitmap(bitmap, 0, 0, width, height,
                matrix, true);
        return resizedBitmap;
    }

    /**
     * (縮放)重繪圖片
     * 
     * @param context
     *            Activity
     * @param bitmap
     * @return
     */
    public static Bitmap reDrawBitMap(Activity context, Bitmap bitmap) {
        DisplayMetrics dm = new DisplayMetrics();
        context.getWindowManager().getDefaultDisplay().getMetrics(dm);
        int rHeight = dm.heightPixels;
        int rWidth = dm.widthPixels;
        // float rHeight=dm.heightPixels/dm.density+0.5f;
        // float rWidth=dm.widthPixels/dm.density+0.5f;
        // int height=bitmap.getScaledHeight(dm);
        // int width = bitmap.getScaledWidth(dm);
        int height = bitmap.getHeight();
        int width = bitmap.getWidth();
        float zoomScale;

        /** 方式3 **/
        if (width >= rWidth)
            zoomScale = ((float) rWidth) / width;
        else
            zoomScale = 1.0f;
        // 創建操作圖片用的matrix對象
        Matrix matrix = new Matrix();
        // 縮放圖片動作
        matrix.postScale(zoomScale, zoomScale);
        Bitmap resizedBitmap = Bitmap.createBitmap(bitmap, 0, 0,
                bitmap.getWidth(), bitmap.getHeight(), matrix, true);
        return resizedBitmap;
    }

    /**
     * 將Drawable轉化為Bitmap
     * 
     * @param drawable
     * @return
     */
    public static Bitmap drawableToBitmap(Drawable drawable) {
        int width = drawable.getIntrinsicWidth();
        int height = drawable.getIntrinsicHeight();
        Bitmap bitmap = Bitmap.createBitmap(width, height, drawable
                .getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
                : Bitmap.Config.RGB_565);
        Canvas canvas = new Canvas(bitmap);
        drawable.setBounds(0, 0, width, height);
        drawable.draw(canvas);
        return bitmap;

    }

    /**
     * 獲得圓角圖片的方法
     * 
     * @param bitmap
     * @param roundPx
     *            一般設成14
     * @return
     */
    public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, float roundPx) {

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

        final int color = 0xff424242;
        final Paint paint = new Paint();
        final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
        final RectF rectF = new RectF(rect);

        paint.setAntiAlias(true);
        canvas.drawARGB(0, 0, 0, 0);
        paint.setColor(color);
        canvas.drawRoundRect(rectF, roundPx, roundPx, paint);

        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
        canvas.drawBitmap(bitmap, rect, rect, paint);

        return output;
    }

    /**
     * 獲得帶倒影的圖片方法
     * 
     * @param bitmap
     * @return
     */
    public static Bitmap createReflectionImageWithOrigin(Bitmap bitmap) {
        final int reflectionGap = 4;
        int width = bitmap.getWidth();
        int height = bitmap.getHeight();

        Matrix matrix = new Matrix();
        matrix.preScale(1, -1);

        Bitmap reflectionImage = Bitmap.createBitmap(bitmap, 0, height / 2,
                width, height / 2, matrix, false);

        Bitmap bitmapWithReflection = Bitmap.createBitmap(width,
                (height + height / 2), Config.ARGB_8888);

        Canvas canvas = new Canvas(bitmapWithReflection);
        canvas.drawBitmap(bitmap, 0, 0, null);
        Paint deafalutPaint = new Paint();
        canvas.drawRect(0, height, width, height + reflectionGap, deafalutPaint);

        canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);

        Paint paint = new Paint();
        LinearGradient shader = new LinearGradient(0, bitmap.getHeight(), 0,
                bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff,
                0x00ffffff, TileMode.CLAMP);
        paint.setShader(shader);
        // Set the Transfer mode to be porter duff and destination in
        paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
        // Draw a rectangle using the paint with our linear gradient
        canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()
                + reflectionGap, paint);

        return bitmapWithReflection;
    }

    /**
     * 將bitmap轉化為drawable
     * 
     * @param bitmap
     * @return
     */
    public static Drawable bitmapToDrawable(Bitmap bitmap) {
        Drawable drawable = new BitmapDrawable(bitmap);
        return drawable;
    }

    /**
     * 獲取圖片類型
     * 
     * @param file
     * @return
     */
    public static String getImageType(File file) {
        if (file == null || !file.exists()) {
            return null;
        }
        InputStream in = null;
        try {
            in = new FileInputStream(file);
            String type = getImageType(in);
            return type;
        } catch (IOException e) {
            return null;
        } finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (IOException e) {
            }
        }
    }

    /**
     * 獲取圖片的類型信息
     * 
     * @param in
     * @return
     * @see #getImageType(byte[])
     */
    public static String getImageType(InputStream in) {
        if (in == null) {
            return null;
        }
        try {
            byte[] bytes = new byte[8];
            in.read(bytes);
            return getImageType(bytes);
        } catch (IOException e) {
            return null;
        }
    }

    /**
     * 獲取圖片的類型信息
     * 
     * @param bytes
     *            2~8 byte at beginning of the image file
     * @return image mimetype or null if the file is not image
     */
    public static String getImageType(byte[] bytes) {
        if (isJPEG(bytes)) {
            return "image/jpeg";
        }
        if (isGIF(bytes)) {
            return "image/gif";
        }
        if (isPNG(bytes)) {
            return "image/png";
        }
        if (isBMP(bytes)) {
            return "application/x-bmp";
        }
        return null;
    }

    private static boolean isJPEG(byte[] b) {
        if (b.length < 2) {
            return false;
        }
        return (b[0] == (byte) 0xFF) && (b[1] == (byte) 0xD8);
    }

    private static boolean isGIF(byte[] b) {
        if (b.length < 6) {
            return false;
        }
        return b[0] == 'G' && b[1] == 'I' && b[2] == 'F' && b[3] == '8'
                && (b[4] == '7' || b[4] == '9') && b[5] == 'a';
    }

    private static boolean isPNG(byte[] b) {
        if (b.length < 8) {
            return false;
        }
        return (b[0] == (byte) 137 && b[1] == (byte) 80 && b[2] == (byte) 78
                && b[3] == (byte) 71 && b[4] == (byte) 13 && b[5] == (byte) 10
                && b[6] == (byte) 26 && b[7] == (byte) 10);
    }

    private static boolean isBMP(byte[] b) {
        if (b.length < 2) {
            return false;
        }
        return (b[0] == 0x42) && (b[1] == 0x4d);
    }

    /**
    *
     */
    public static String getImagePath(Uri uri, Activity context) {

        String[] projection = { MediaColumns.DATA };
        Cursor cursor = context.getContentResolver().query(uri, projection,
                null, null, null);
        if (cursor != null) {
            cursor.moveToFirst();
            int columIndex = cursor.getColumnIndexOrThrow(MediaColumns.DATA);
            String ImagePath = cursor.getString(columIndex);
            cursor.close();
            return ImagePath;
        }

        return uri.toString();
    }

    static Bitmap bitmap = null;

    /**
     * 2014年8月13日
     * 
     * @param uri
     * @param context
     *            E-mail:mr.huangwenwei@gmail.com
     */
    public static Bitmap loadPicasaImageFromGalley(final Uri uri,
            final Activity context) {

        String[] projection = { MediaColumns.DATA, MediaColumns.DISPLAY_NAME };
        Cursor cursor = context.getContentResolver().query(uri, projection,
                null, null, null);
        if (cursor != null) {
            cursor.moveToFirst();

            int columIndex = cursor.getColumnIndex(MediaColumns.DISPLAY_NAME);
            if (columIndex != -1) {
                new Thread(new Runnable() {

                    @Override
                    public void run() {
                        try {
                            bitmap = android.provider.MediaStore.Images.Media
                                    .getBitmap(context.getContentResolver(),
                                            uri);
                        } catch (FileNotFoundException e) {
                            e.printStackTrace();
                        } catch (IOException e) {
                            e.printStackTrace();
                        }

                    }
                }).start();
            }
            cursor.close();
            return bitmap;
        } else
            return null;
    }
    
    public static Bitmap rotateAndScale(Bitmap b, int degrees, float maxSideLen) {

        return rotateAndScale(b, degrees, maxSideLen, true);
    }
    public static Bitmap rotateAndScale(Bitmap b, int degrees, float maxSideLen, boolean recycle) {
//        if (null == b || degrees == 0 && b.getWidth() <= maxSideLen + 10 && b.getHeight() <= maxSideLen + 10) {
//            return b;
//        }

        Matrix m = new Matrix();
        if (degrees != 0) {
            m.setRotate(degrees);
        }

//        float scale = Math.min(maxSideLen / b.getWidth(), maxSideLen / b.getHeight());
//        if (scale < 1) {
//            m.postScale(scale, scale);
//        }
        try {
            Bitmap b2 = Bitmap.createBitmap(b, 0, 0, b.getWidth(), b.getHeight(), m, true);
            if (null != b2 && b != b2) {
                if (recycle) {
                    b.recycle();
                }
                b = b2;
            }
        } catch (OutOfMemoryError e) {
        }

        return b;
    }
    public static Bitmap decodeByteArrayUnthrow(byte[] data, BitmapFactory.Options opts) {
        try {
            return BitmapFactory.decodeByteArray(data, 0, data.length, opts);
        } catch (Throwable e) {
            
        }

        return null;
    }
    public static boolean saveBitmap2file(Bitmap bmp, File file, Bitmap.CompressFormat format, int quality) {
        if (file.isFile())
            file.delete();
        OutputStream stream = null;
        try {
            stream = new FileOutputStream(file);
        } catch (FileNotFoundException e) {
            return false;
        }

        return bmp.compress(format, quality, stream);
    }
    
    
    /*
     * 視頻錄制所需工具類
     */
    public static List<Camera.Size> getResolutionList(Camera camera)
    { 
        Parameters parameters = camera.getParameters();
        List<Camera.Size> previewSizes = parameters.getSupportedPreviewSizes();
        return previewSizes;
    }
    
    public static class ResolutionComparator implements Comparator<Camera.Size>{

        @Override
        public int compare(Size lhs, Size rhs) {
            if(lhs.height!=rhs.height)
            return lhs.height-rhs.height;
            else
            return lhs.width-rhs.width;
        }
    }
}