问题 如何将Bitmap转换为Base64字符串

我正在开发一个上传的Android应用程序 Base64 图像字符串到Web服务器。因此，我使用以下代码将Bitmap转换为 Base64 串。

public String getEncoded64ImageStringFromBitmap(Bitmap bitmap) {
    ByteArrayOutputStream stream = new ByteArrayOutputStream();
    bitmap.compress(Bitmap.CompressFormat.PNG, 100, stream);
    byte[] byteFormat = stream.toByteArray();
    String imgString = Base64.encodeToString(byteFormat, Base64.NO_WRAP);
    return imgString;
}

例如，我需要转换它图片。转换后，我没有得到 Base64 我期望的字符串。

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

它应该是真正的Base64字符串（我用它网站转换）

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

我的转换有什么问题？谢谢！

public static String encodeTobase64(Bitmap image)
{
   Bitmap immagex=image;
   ByteArrayOutputStream baos = new ByteArrayOutputStream();
   immagex.compress(Bitmap.CompressFormat.PNG, 100, baos);
   byte[] b = baos.toByteArray();
   String imageEncoded = Base64.encodeToString(b,Base64.DEFAULT);
   return imageEncoded;
}

public static Bitmap decodeBase64(String input)
{
   byte[] decodedByte = Base64.decode(input, 0);
   return BitmapFactory.decodeByteArray(decodedByte, 0, decodedByte.length);
}

使用以下代码段进行转换位图至 字节数组：

ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();  
bitmap.compress(Bitmap.CompressFormat.PNG, 100, byteArrayOutputStream);
byte[] byteArray = byteArrayOutputStream .toByteArray();

然后编码 BASE64 从 字节数组 使用以下声明：

String encoded = Base64.encodeToString(byteArray, Base64.DEFAULT);

public String getBase64ImageString(Bitmap photo) {
        String imgString;
        if(photo != null) {
            ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
            photo.compress(Bitmap.CompressFormat.PNG, 100, outputStream);
            byte[] profileImage = outputStream.toByteArray();

            imgString = Base64.encodeToString(profileImage,
                    Base64.NO_WRAP);
        }else{
            imgString = "";
        }

        return imgString;
    }

在您将获得图像字符串的参数中传递您的位图。

你的转换没有问题。您正在通过额外的压缩步骤运行它，这很可能解释了差异。 - Robby Cornelissen

尝试更改bitmap.compress（Bitmap.CompressFormat.JPEG，100，stream）;从他们的压缩可能会产生一些差异， - EminenT

我已经尝试使用Bitmap.CompressFormat.JPEG。但是android base64字符串的结果与网站转换不同。 - SinLok

嗨@SinLok，你有解决方案吗？我犯了同样的错误 ... - Felipe Augusto

我的代码与你相似。我无法将位图转换为相应的base64字符串。 - SinLok

不，您的代码与我的代码不同。你的代码是String imgString = Base64.encodeToString（byteFormat，Base64.NO_WRAP）;我已将其更改为String imageEncoded = Base64.encodeToString（b，Base64.DEFAULT）;您使用过Base64.No_WRAP，但我的代码中是Base64.DEFAULT。 - Dhruv

哦，我明白了，但我复制你的代码使用。并发现Base64字符串类似于Base64.NO_WRAP。只有不同的是Base64字符串不在单行中。但是，使用Base64.DEFAULT生成Base64字符串与实际的Base64字符串不同。对不起，我的英语不好：） - SinLok

问题如何将Bitmap转换为Base64字符串

答案:

热门问题

问题 如何将Bitmap转换为Base64字符串

答案:

热门问题

问题如何将Bitmap转换为Base64字符串