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BitmapFactory.Options

BitmapFactory.Options bmpFactoryOptions = new BitmapFactory.Options();bmpFactoryOptions.inSampleSize = 8;Bitmap bmp = BitmapFactory.decodeFile(imageFilePath, bmpFactoryOptions);imv.setImageBitmap(bmp);

上面的代码使图片变成原来的1/8.\

    //imv = (ImageView) findViewById(R.id.ReturnedImageView);            Display currentDisplay = getWindowManager().getDefaultDisplay();            int dw = currentDisplay.getWidth();            int dh = currentDisplay.getHeight();           try           {            BitmapFactory.Options bmpFactoryOptions = new BitmapFactory.Options();            bmpFactoryOptions.inJustDecodeBounds = true;            Bitmap bmp = BitmapFactory.decodeStream(getContentResolver().                    openInputStream(imageFileUri), null,  bmpFactoryOptions);            int heightRatio = (int)Math.ceil(bmpFactoryOptions.outHeight/(float)dh);            int widthRatio = (int)Math.ceil(bmpFactoryOptions.outWidth/(float)dw);            Log.v("HEIGHRATIO", ""+heightRatio);            Log.v("WIDTHRATIO", ""+widthRatio);            if (heightRatio > 1 && widthRatio > 1)            {                bmpFactoryOptions.inSampleSize =  heightRatio > widthRatio ? heightRatio:widthRatio;            }            bmpFactoryOptions.inJustDecodeBounds = false;            bmp = BitmapFactory.decodeStream(getContentResolver().                    openInputStream(imageFileUri), null,  bmpFactoryOptions);            returnedImageView.setImageBitmap(bmp);           }           catch (FileNotFoundException e)           {               Log.v("ERROR", e.toString());           }

上面的代码让图片根据窗口大小改变

bmpFactoryOptions.inJustDecodeBounds = true;

这一行让代码只解码图片的Bounds

BitmapFactory.Options