Android图片缩放 指定尺寸

//使用Bitmap加Matrix来缩放

    public static Drawable resizeImage(Bitmap bitmap, int w, int h)

    { 

        Bitmap BitmapOrg = bitmap; 

        int width = BitmapOrg.getWidth(); 

        int height = BitmapOrg.getHeight(); 

        int newWidth = w; 

        int newHeight = h; 

 

        float scaleWidth = ((float) newWidth) / width; 

        float scaleHeight = ((float) newHeight) / height; 

 

        Matrix matrix = new Matrix(); 

        matrix.postScale(scaleWidth, scaleHeight); 

        // if you want to rotate the Bitmap  

        // matrix.postRotate(45);  

        Bitmap resizedBitmap = Bitmap.createBitmap(BitmapOrg, 0, 0, width, 

                        height, matrix, true); 

        return new BitmapDrawable(resizedBitmap); 

    }

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//使用BitmapFactory.Options的inSampleSize参数来缩放     public static Drawable resizeImage2(String path,             int width,int height)     {         BitmapFactory.Options options = new BitmapFactory.Options();         options.inJustDecodeBounds = true;//不加载bitmap到内存中         BitmapFactory.decodeFile(path,options);         int outWidth = options.outWidth;         int outHeight = options.outHeight;         options.inDither = false;         options.inPreferredConfig = Bitmap.Config.ARGB_8888;         options.inSampleSize = 1;                   if (outWidth != 0 && outHeight != 0 && width != 0 && height != 0)         {             int sampleSize=(outWidth/width+outHeight/height)/2;             Log.d(tag, "sampleSize = " + sampleSize);             options.inSampleSize = sampleSize;         }               options.inJustDecodeBounds = false;         return new BitmapDrawable(BitmapFactory.decodeFile(path, options));         }

 

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