Android-读取本地文本，把Base64 datastring转换为图片

最新推荐文章于 2024-09-09 09:46:07 发布

原创最新推荐文章于 2024-09-09 09:46:07 发布 · 1.6k 阅读

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文章标签：

#base64 #图片 #string

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本文介绍了一种将图片文件转换为Base64编码字符串，并将其保存到外部存储设备的方法。通过使用Java的Bitmap和Base64编码库，实现了图片的高效编码与存储。

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         String path="storage/sdcard0/a.jpg";
         Bitmap b= BitmapFactory.decodeFile(path);
         ByteArrayOutputStream out = null;
         try {
             out = new ByteArrayOutputStream();
                 b.compress(Bitmap.CompressFormat.JPEG, 100, out);
             out.flush();
             out.close();
             byte[] imgBytes = out.toByteArray();
             String b64=Base64.encodeToString(imgBytes, Base64.CRLF);
         System.out.println(b64);
         RandomAccessFile raf = new RandomAccessFile(mFile, "rw");
         raf.seek(mFile.length());
         raf.write(b64.getBytes());
         raf.close();
         } catch (Exception e) {
         // TODO Auto-generated catch block

         } finally {
         try {
         out.flush();
         out.close();
         } catch (IOException e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
         }
         }
----------------------------------------------------------------------------
 String  sdPath=Environment.getExternalStorageDirectory().toString();

        StringBuffer sb = new StringBuffer();
        File file = new File(sdPath+"/base64.txt");
        try {
            FileInputStream fis = new FileInputStream(file);
            int c;
            while ((c = fis.read()) != -1) {
                sb.append((char) c);
            }
            fis.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        //--------------------转换分割线-------------------------------------
        byte[] bytes = Base64.decode(sb.toString(), Base64.DEFAULT);
        Bitmap bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);

        File newFile = new File(sdPath, "new.jpg");
        if (!newFile.exists()) {
            try {
                newFile.createNewFile();
                FileOutputStream o = new FileOutputStream(newFile);
                if (bitmap.compress(Bitmap.CompressFormat.JPEG, 100, o)) {
                    Toast.makeText(this, "转换成功", Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(this, "转换失败", Toast.LENGTH_SHORT).show();
                }

            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }