0

我正在尝试将位码图像转换为 base64 格式。我试着像这样编码

public static String encodeToBase64(Bitmap image, Bitmap.CompressFormat compressFormat, int quality)
{
    ByteArrayOutputStream byteArrayOS = new ByteArrayOutputStream();
    image.compress(compressFormat, quality, byteArrayOS);
    return Base64.encodeToString(byteArrayOS.toByteArray(), Base64.URL_SAFE);
}

生成的响应低于它不会再次给我图像。

有人可以在这里提供一些指示吗？我可能做错了什么？

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4

2 回答 2

1

试试这个功能：

public static String imageToString(Bitmap BitmapData) {

        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        BitmapData.compress(Bitmap.CompressFormat.PNG, 100, bos);
        byte[] byte_arr = bos.toByteArray();

        String file = Base64.encodeToString(byte_arr, Base64.DEFAULT);
        //appendLog(file);
        return file;
    }
于 2017-04-25T10:44:08.017 回答
0

这里有一些误解。在您的方法中，您通过参数接收位图（图像）。如果您想将它传递给base64format，那么您做对了，因为base64format 只是一个大字符串，正如您在 return 中看到的那样。

如果错误在您的方法中并且在反向过程中（将其解析为String），您可以尝试此功能：Base64Bitmap

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

base64从byte array使用以下方法进行编码：

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

另外，尝试使用此方法来反转编码过程：

byte[] decodedString = android.util.Base64.decode(yourString, android.util.Base64.DEFAULT);
                            Bitmap decodedByte = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length);
于 2017-04-25T10:49:46.930 回答