Android 在将Base64字符串解码为图像时，我得到了一个完全黑色的图像

我使用这个函数对图像进行编码

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;
        }

这就是我创建位图图像的方式

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);
            }
        });

在使用在线工具对由此生成的字节64字符串进行解码时，我得到了一幅完全黑色的图像

这是我的字节64字符串

/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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/KgMn/bfyOfVhz/nuM8gE4Vvil/in/6US95ev/t1QmElvvnkE2eg/wCPY+rf7R9PY5Ix0AqWXy5E
Mkc0vlDHEA937hvTHuOc9dxypX8yMxR/6ybrBz6t/Pg9ehwcANmKO4kkzHJ/yxx55+hf+gP59ejH
L2K8vvkPml3/AARWu7cSR4kaWWKbGbfz/d/fPbPXjnOcDMun6XZbzJ50vmw4HkEEdC/P3j/iPmBy
cmpF8uN28yT/AFM49AOC3uc4HTnOMDOSc2hcSRuZPM8o/wDHvbwQf8vXLZOc8cfiMLyMnJ7FeX3y
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dTnnJ/I5AI5tXEgjtY5JJB5vkC4/cDtlvfP5ewwQQRzGxDFcSSC49Jtvr/00Hr7j6HHJIYmzH/q5
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7r7L6c3n5/1c6qErtq32V+bX6X+/s722j8yBvL56euOr88n8u5yRkkZrA1GSTzY44/8AVcf6jPbf
7n/HGRng1tWtxLIGl8zMXA8/p3bHf/Z57ZwMZyTI1nJI08vl/wCpxPOefVgD17+/TC5JByFP+JP5
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P35H/LkCw6EkjHH0yeTyaqt/pDGOX91+fcn/AA/yQak1LEvDG4j8398Rcd+eW9/c9e2MkA1QaSSS
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---

你的编码是正确的，只是检查了一下。您很可能在尝试从logcat复制编码字符串时出错。只需将断点放在

Log.d（）

上，复制编码的字符串值，然后通过在线工具再次检查它。我曾经测试过结果。

我没有用Android编写代码，但我认为你把数据弄混了。例如，say

decodeByteArray

将“从指定的字节数组解码一个不可变的位图”。因此这一行：

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

仅当

jpeg

数组包含原始RGB颜色值而不是实际的jpeg值时才有效（因为jpeg是压缩数学而不是颜色数组）

试试这个，看看是否有人可以显示字符串

加密图像

。没有使用另一个函数

私有字符串encodeImage（位图bm）

，因为我怀疑这是问题的一部分

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);
    }
}); 

---

请也添加解码代码块。@ArtyomDorosh我已经用网站解码器解码了。什么在线工具？如果你不告诉我们，我们就不能复制你的问题。@Alex看到了，我完全复制粘贴了上面的字符串，得到了一个完全黑色的图像。这是看到这一点，我已经完全复制粘贴上面的字符串，并得到一个完全黑色image@mayanktripathi你能在原始问题中分享你是如何创建这个位图的吗？是的，我已经添加了那个部分。对我来说，问题是从logcat复制