Question

我开发了一个自定义信使应用程序，它将来自客户端（Android）的消息发送到另一个客户端（Web）。我的问题是当我发送图像文件时，我将其编码为Base64字符串，然后将其发送到另一个客户端。当收件人客户端是Android时，应用程序成功将Base64字符串解码为位图图像。但是当收件人客户端是Web应用程序时，Web应用程序无法解码并使用以下方式显示它：

<img id="img" src="data:image/jpeg;base64,3iVBORw0KGgoAAAANSU...">

我的Java编码/解码方法

    public static Bitmap base64StringToBitmap(String base64) {
        byte[] bytes = Base64.decode(base64, Base64.URL_SAFE);
        return BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
    }

    public static String bitmapToBase64String(Bitmap bmp, Bitmap.CompressFormat format, int quality) {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();  
        bmp.compress(format, quality, baos);
        byte[] bytes = baos.toByteArray();
        return Base64.encodeToString(bytes, Base64.URL_SAFE);
    }

我尝试将编码方法更改为Base64.DEFAULT，但仍然无法使用Base64在HTML中显示data:image/jpeg;base64字符串。用于在HTML中显示图片的Android Base64字符串和Base64字符串之间是否存在任何差异？请建议我的解决方案。感谢

编辑：

这是从我的Android应用程序生成的base64字符串示例，带有填充。我没能在html / web上显示它，虽然它可以在Android上正常显示：

3iVBORw0KGgoAAAANSUhEUgAAAF8AAABfCAYAAACOTBv1AAAABHNCSVQICAgIfAhkiAAAChtJREFU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2+/fv5+rV1FREXf4mO1q+BQNuBdaVVZWSvMS0TfNtpcB+G3hAD/cvIqLi41ipgbgu5QblM8lYFmJ
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/nct/KXKCl++fAk2/PTpkzD4tOru7pbmlZGRwdVr27Zthnt9QNL3flrt3btXmherj3YBNqYOVh5S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L1DSzvFm0iVFmjMfmC0cioUkQn1xK+VsaBgwSba3t2M71NfX5zhsAOOnjWOuTgaKkM/xrCoFi3sV
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Y+GmXJh64Cdv2H+CYilOKOh/G/IaeDiFexQAAAAASUVORK5CYII=

Answer 1

我有一个类似的问题，我想用Android将生成的BASE64字符串转换为Binary，atob函数一直给我错误。我的第一个猜测就是使用URL_SAFE代替DEFAULT而不是Base64.NO_WRAP，但它们都没有用，然后我发现我需要使用Base64.NO_WRAP方法来使其正常工作。我测试return Base64.encodeToString(bytes, Base64.URL_SAFE);并显示内嵌图像和IT工作!!!!

希望这可以省去一些神经，因为我确实有一些东西，直到我弄明白该怎么做。

为了给出好的答案，请将return Base64.encodeToString(bytes, Base64.NO_WRAP);更改为：{{1}}

电子

Answer 2

你可以尝试使用它吗？它工作正常一两只更改Base64.DEFAULT insted的URL_SAFE和图像标记alt。检查一下。

<img height=700px src='data:image/jpg;base64,"+encodeString+"' alt='Embeded Image'/>

public static String bitmapToBase64String(Bitmap bmp, Bitmap.CompressFormat format, int quality) {
    ByteArrayOutputStream baos = new ByteArrayOutputStream();  
    bmp.compress(format, quality, baos);
    byte[] bytes = baos.toByteArray();
    return Base64.encodeToString(bytes, Base64.DEFAULT);
}

在HTML Base64图像上转换Android Base64位图和显示

2 个答案: