图片转成base64编码

IOS:

// UIImage的图片转成Base64编码字符串：

UIImage *originImage = [UIImage imageNamed:@"originImage.png"];
NSData *data = UIImageJPEGRepresentation(originImage, 1.0f);
NSString *encodedImageStr = [data base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];

// Base64编码字符串转UIImage的图片：

NSData *decodedImageData = [[NSData alloc] 
initWithBase64EncodedString:encodedImageStr options:NSDataBase64DecodingIgnoreUnknownCharacters];
UIImage *decodedImage = [UIImage imageWithData:decodedImageData];

android:

//将图片转换成base64编码

    private void encode(String path) {
                    //decode to bitmap
                    Bitmap bitmap = BitmapFactory.decodeFile(path);
                    Log.d(TAG, "bitmap width: " + bitmap.getWidth() + " height: " + bitmap.getHeight());
                    //convert to byte array
                    ByteArrayOutputStream baos = new ByteArrayOutputStream();
                    bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos);
                    byte[] bytes = baos.toByteArray();

                    //base64 encode
                    byte[] encode = Base64.encode(bytes,Base64.DEFAULT);
                    String encodeString = new String(encode);
                    mTvShow.setText(encodeString);
    }
//将base64还原成图片

    public void onDecodeClicked(View view) {
        byte[] decode = Base64.decode(mTvShow.getText().toString(),Base64.DEFAULT);
        Bitmap bitmap = BitmapFactory.decodeByteArray(decode, 0, decode.length);
        //save to image on sdcard
        saveBitmap(bitmap);
    }

    private void saveBitmap(Bitmap bitmap) {
        try {
            String path = Environment.getExternalStorageDirectory().getPath()
                    +"/decodeImage.jpg";
            Log.d("linc","path is "+path);
            OutputStream stream = new FileOutputStream(path);
            bitmap.compress(Bitmap.CompressFormat.JPEG, 90, stream);
            stream.close();
            Log.e("linc","jpg okay!");
        } catch (IOException e) {
            e.printStackTrace();
            Log.e("linc","failed: "+e.getMessage());
        }
    }