将Base64字符串解码为图像时，我得到一个完全黑色的图像

我已经使用此函数对图像进行编码。将Base64字符串解码为图像时，我得到一个完全黑色的图像

private String encodeImage(Bitmap bm) 
     { 
      ByteArrayOutputStream baos = new ByteArrayOutputStream(); 
      bm.compress(Bitmap.CompressFormat.JPEG,100,baos); 
      byte[] b = baos.toByteArray(); 
      String encImage = Base64.encodeToString(b, Base64.DEFAULT); 
      Log.d(TAG, "encodeImage: " + encImage); 
      return encImage; 
     }

这是我如何创建位图图像

setContentView(R.layout.camera); 
     cameraView = (CameraView) findViewById(cameras); 
     cameraView.setJpegQuality(2); 
     cameraView.setCameraListener(new CameraListener() { 
      @Override 
      public void onPictureTaken(byte[] jpeg) { 
       super.onPictureTaken(jpeg); 

       Bitmap bitmap = BitmapFactory.decodeByteArray(jpeg, 0, jpeg.length); 
       encodeImage(bitmap); 
      } 
     });

解码时通过使用这个在线工具，我得到全黑图像产生的byte64字符串。

这是我byte64串

/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEB 
AQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQH/2wBDAQEBAQEBAQEBAQEBAQEBAQEBAQEB 
AQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQH/wAARCBIACiADASIA 
AhEBAxEB/8QAHwAAAQUBAQEBAQEAAAAAAAAAAAECAwQFBgcICQoL/8QAtRAAAgEDAwIEAwUFBAQA 
AAF9AQIDAAQRBRIhMUEGE1FhByJxFDKBkaEII0KxwRVS0fAkM2JyggkKFhcYGRolJicoKSo0NTY3 
ODk6Q0RFRkdISUpTVFVWV1hZWmNkZWZnaGlqc3R1dnd4eXqDhIWGh4iJipKTlJWWl5iZmqKjpKWm 
p6ipqrKztLW2t7i5usLDxMXGx8jJytLT1NXW19jZ2uHi4+Tl5ufo6erx8vP09fb3+Pn6/8QAHwEA 
AwEBAQEBAQEBAQAAAAAAAAECAwQFBgcICQoL/8QAtREAAgECBAQDBAcFBAQAAQJ3AAECAxEEBSEx 
BhJBUQdhcRMiMoEIFEKRobHBCSMzUvAVYnLRChYkNOEl8RcYGRomJygpKjU2Nzg5OkNERUZHSElK 
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uLm6wsPExcbHyMnK0tPU1dbX2Nna4uPk5ebn6Onq8vP09fb3+Pn6/9oADAMBAAIRAxEAPwD8GJbi 
TYY/tPp+455wX/l1685HJIJNCWOO4jaSKTzR/wDXOD19icfTnK0NcRyXVtJF5pimx58GOOr+/bA6 
8de61KPNijI8vrxz3+Yjpk8c9D74yDX5OfUCqsMgjkjgi83z+J57c+rn2yDz7A8c5zUUatHMfKSK 
L18gNnq/t34x6c8knJe0eIDJG3lf9PHpy3oT6fnnnrVVfLzex+R/y3E59+ZB/eyP5++ax9hDvL71 
/wDImVofzP7v+AXoPtEUZkj9v9eB1y3PU9sfTJweWqgJPPeaOT/VeQP0LDpz2Pr+IJzV+PzI4z5v 
t/N8nqfY45xnAPJNVY444g0VzHzgf9fnVv8AAfz4P3uUgfZW8clsbiOPzfOg/f8AH+03t7D268gk 
ZnjkjtnNv1/+szDnk59vYkE85qxplvHIZf3nUccnn5n9ScfXrnPGMU4R23nT+XL+9wBcH7PyMF/+ 
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HI5Yf1HfsOo5qV7wCZoo4/T/AJd/dhnr/u9e/AHU1Vu5PtDmOWT97x09cv7k9uPcsM8E1wm5YYRS 
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Mkc0vlDHEA937hvTHuOc9dxypX8yMxR/6ybrBz6t/Pg9ehwcANmKO4kkzHJ/yxx55+hf+gP59ejH 
L2K8vvkPml3/AARWu7cSR4kaWWKbGbfz/d/fPbPXjnOcDMun6XZbzJ50vmw4HkEEdC/P3j/iPmBy 
cmpF8uN28yT/AFM49AOC3uc4HTnOMDOSc2hcSRuZPM8o/wDHvbwQf8vXLZOc8cfiMLyMnJ7FeX3y 
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7r7L6c3n5/1c6qErtq32V+bX6X+/s722j8yBvL56euOr88n8u5yRkkZrA1GSTzY44/8AVcf6jPbf 
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P35H/LkCw6EkjHH0yeTyaqt/pDGOX91+fcn/AA/yQak1LEvDG4j8398Rcd+eW9/c9e2MkA1QaSSS 
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poyavZprR/K72s9U9L66bp3uWpVWTz4vM/5Yc8j1foN3Qk/hxyc1VjRsTx4z/wBMMj1Pqcnt3656 
mmCeKQNLv83zpxnnryw9f9n1zyOpyaBHgT+YP3s3Fvz6FvUHgZ79sdwcyTzvy+5//JDrhl/dyebF 
/wCA57Hj8+p/LOearbGjB8zgTY/0fIz1bHGfb69PRiWRx+XIY5Jov3P/AE2P2Tq/v+OM85POME2R 
cSSZ/wDbfPq3OP8AgP8APOMYPbRk489rfZ79Obz8/wAuzvTn2s9+j+XUvWVulzn95nGPT1bnr6Yx 
1zzySBUYkw05kMpAKj36uOwzzjJHXtyQCasdxFFMfLk7D36E/wCJOM55xkdaScZlLyH96f8Alv8A 
QsfX6/j3xursw8pNy0Vr07+nNPz/ALq+97kqb626dHteV+vZRfzfVMmkSRmMsUsp87Hri5wz8j9T 
jryepAYyRIY4448enn9P9GvOQe/r15I5GcAZqJXiDGKPnHE/v8xx3PqR69cZwxq+H8sRyeb/AMsB 
5A/4E+e59vfr68lWUot6K15W9FKXn5/l2dzneu

来源

2017-07-19 mayank tripathi

请加上解码代码块。 –

@ArtyomDorosh我已经使用网站解码器解码它。 –

什么在线工具？如果你不告诉我们，我们不能复制你的问题。 – Alex

您的编码代码OK，只是检查了它。你很可能犯了错误，试图从logcat复制你的编码字符串。只需在Log.d()上放置断点，复制编码的字符串值并通过在线工具再次检查出来。我用this来测试结果。

来源

2017-07-19 23:39:31

https://i.stack.imgur.com/DN2NM.png看到这个，我已经完全复制粘贴上面的字符串，并获得一个完全黑色的图像 –

@mayanktripathi你可以分享你如何在原始问题中创建这个位图吗？ –

是的，我已经添加了该部分。 –

我没有在Android中编码，但我认为你在混合你的数据。例如manual表示decodeByteArray将“解码来自指定字节数组的不可变位图”。所以这行：

Bitmap bitmap = BitmapFactory.decodeByteArray(jpeg, 0, jpeg.length);

如果jpeg数组包含原始RGB颜色值而不是实际值JPEG只会工作（因为JPEG压缩是数学不是颜色数组）。

试试这个，看看是否字符串encImage可以通过online tool来显示。没有使用其他功能private String encodeImage(Bitmap bm)，因为我怀疑它是问题的一部分...

setContentView(R.layout.camera); 
cameraView = (CameraView) findViewById(cameras); 

cameraView.setPictureFormat(ImageFormat.JPEG); 
cameraView.setJpegQuality(2); 

cameraView.setCameraListener(new CameraListener() { 

    @Override 
    public void onPictureTaken(byte[] jpeg) 
    { 
     super.onPictureTaken(jpeg); 

     String encImage = Base64.encodeToString(jpeg, Base64.DEFAULT); //print and test this string in some B64-to-JPEG decoder/viewer 

     //Bitmap bitmap = BitmapFactory.decodeByteArray(jpeg, 0, jpeg.length); 
     //encodeImage(bitmap); 
    } 
});

来源

2017-07-20 18:15:49

将Base64字符串解码为图像时，我得到一个完全黑色的图像

回答

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