drawable轉file方法

drawable轉file方法：

/**
     * drawable轉爲file
     * @param mContext
     * @param drawableId  drawable的ID
     * @param fileName   轉換後的文件名
     * @return
     */
    public File drawableToFile(Context mContext,int drawableId,File fileName){
//        InputStream is = view.getContext().getResources().openRawResource(R.drawable.logo);
        Bitmap bitmap = BitmapFactory.decodeResource(mContext.getResources(), drawableId);
//        Bitmap bitmap = BitmapFactory.decodeStream(is);

        String defaultPath = mContext.getFilesDir()
                .getAbsolutePath() + "/defaultGoodInfo";
        File file = new File(defaultPath);
        if (!file.exists()) {
            file.mkdirs();
        } else {
            return null;
        }
        String defaultImgPath = defaultPath + "/"+fileName;
        file = new File(defaultImgPath);
        try {
            file.createNewFile();

            FileOutputStream fOut = new FileOutputStream(file);

            bitmap.compress(Bitmap.CompressFormat.PNG, 20, fOut);
//            is.close();
            fOut.flush();
            fOut.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return file;
    }