根据缩略的宽高比例和设定的最大宽高设置图片的宽高 长图会截取中间一段

 /* *      

 * 根据缩略的宽高比例和设定的最大宽高设置图片的宽高 长图会截取中间一段

 */

public static synchronized Bitmap readBitmap(String key, int width,

                int height) {

        File bitmapFile = null;

        Bitmap bitmap = null;

        boolean toLongOrWidth = false;

        boolean widthbigger = false;

        try {

                bitmapFile = getFile(key);

        } catch (FileNotFoundException e) {

                // TODO Auto-generated catch block

                e.printStackTrace();

        }

        if (bitmapFile != null) {

 

                BitmapFactory.Options options = new Options();

                options.inJustDecodeBounds = true;

 

                try {

                        BitmapFactory.decodeStream(new FileInputStream(bitmapFile),

                                        null, options);

                        int outheight = options.outHeight;

                        int outwidth = options.outWidth;

                        float rate;

                        if (outheight > outwidth) {

                                rate = (float) outheight / (float) outwidth;

                                if (rate > 2.0) {

                                        toLongOrWidth = true;

                                }

                                height = (int) (width * rate);

                                widthbigger = false;

                        } else {

                                rate = (float) outwidth / (float) outheight;

                                if (rate > 2.0) {

                                        toLongOrWidth = true;

                                }

                                width = (int) (height * rate);

                                widthbigger = true;

                        }

 

                        int size = calculateInSampleSize(options, width, height);

                        options.inSampleSize = size;

                        options.inJustDecodeBounds = false;

                        bitmap = BitmapFactory.decodeStream(new FileInputStream(

                                        bitmapFile), null, options);

                        Bitmap dst = Bitmap.createScaledBitmap(bitmap, width, height,

                                        false);

                        if (toLongOrWidth) {

                                if (widthbigger) {

                                        int oldwidth = width;

                                        width = (int) ((float) height * (float)1.77);

                                        dst = Bitmap.createBitmap(dst, (oldwidth - width) / 2,

                                                        0, width, height);

 

                                } else {

                                        int oldheight = height;

                                        height = (int) ((float) width * (float)1.77);

                                        dst = Bitmap.createBitmap(dst, 0,

                                                        (oldheight - height) / 2, width, height);

                                }

                                Bitmap newb = Bitmap.createBitmap(dst.getWidth(),

                                                dst.getHeight(), Config.ARGB_8888);

                                Canvas canvasTmp = new Canvas(newb);

                                canvasTmp.drawColor(Color.TRANSPARENT);

                                Paint p = new Paint();

                                Typeface font = Typeface.create("宋体", Typeface.BOLD);

                                p.setAntiAlias(true); // 设置画笔为无锯齿

                                p.setColor(Color.WHITE);

                                p.setTypeface(font);

                                p.setTextSize(ImageUtils.dp2px(HoHoApplication.mAppContext,

                                                (float) 12));

                                canvasTmp.drawBitmap(dst, 0, 0, p);

                                Paint p2 = new Paint();

                                p2.setColor(Color.parseColor("#77000000"));

                                Rect r = new Rect(0, dst.getHeight()

                                                - ImageUtils.dp2px(HoHoApplication.mAppContext,

                                                                (float) 24), dst.getWidth(),

                                                dst.getHeight());

                                canvasTmp.drawRect(r, p2);

                                canvasTmp.drawText(

                                                "长图",

                                                dst.getWidth()

                                                                / 2

                                                                - ImageUtils.dp2px(

                                                                                HoHoApplication.mAppContext,

                                                                                (float) 12),

                                                dst.getHeight()

                                                                - ImageUtils.dp2px(

                                                                                HoHoApplication.mAppContext,

                                                                                (float) 6), p);

                                canvasTmp.save(Canvas.ALL_SAVE_FLAG);

                                canvasTmp.restore();

                                dst = newb;

                        }

                        if (bitmap != dst) { // 如果没有缩放，那么不回收

                                bitmap.recycle(); // 释放Bitmap的native像素数组

                        }

                        return dst;

 

                } catch (FileNotFoundException e) {

                        // TODO Auto-generated catch block

                        e.printStackTrace();

                }

 

        }

        return bitmap;

}