Android蓝牙输入/输出流：发送~1400字节，接收1008

Posted 2023-02-25

【中文标题】Android蓝牙输入/输出流：发送~1400字节，接收1008

【英文标题】：Android Bluetooth Input/Outputstream: Sent ~1400 bytes, received 1008

【发布时间】：2012-02-08 15:59:33

【问题描述】：

我正在尝试在两部 android 4.0.1 手机之间发送数据，当我发送数据时，我没有收到另一端的完整数组。

我的代码：

byte[] buffer = new byte[4096];
int bytes;

bytes = inputStream.read(buffer);
// bytes = 1008
// buffer[1008..4095] = 0 
// =================== other side =============================
byte[] message = Tools.concatByteArray(response, authorizationMessage);

// Debug tells me that the array has 1400 bytes
outputStream.write(message);
outputStream.flush();

调试中的消息是：

[102, -32, 27, 23, 31, 111, -43, 124, 105, -122, 89, 13, 80, 62, 107, -21, 44, -93, -24, 100, -28, 18, -10, -55, 8, -7, 95, -82, -127, -125, -13, -14, 82, 93, -112, 33, 5, -43, 82, -89, -60, 111, 61, 5, 65, 1, -105, -65, -77, -119, 126, -118, -67, 32, -115, 106, -10, 75, 44, 101, 60, -110, -71, -27, 44, -111, 83, 83, 99, -25, -71, 12, -101, -35, -79, -115, 99, 107, 21, 118, -52, -107, -51, -122, 106, 12, 43, 23, 111, -60, -79, -20, 57, -28, 99, -106, -87, 74, -18, 71, 44, -26, -6, 80, -124, 34, -69, 27, 46, -15, -97, -71, 84, 30, -121, -36, 65, -46, 66, -34, 69, -127, -16, 100, 114, 38, -110, -24, -34, 82, 69, -75, 108, 42, 83, 103, -14, -54, 10, 85, 107, -1, 42, 41, 106, 4, 65, 122, -101, -45, 19, 32, -110, 61, 53, 73, -97, -119, -63, 96, 55, -103, -59, -84, -35, -64, 47, -58, -38, 8, 9, 3, 82, -109, -78, 124, 69, -2, -74, -55, 72, -26, 33, -110, 92, -48, 87, 81, 39, 95, -45, 121, -82, -75, -79, -104, 93, 37, -118, 108, 20, -49, -96, 74, -120, -89, 110, -36, 115, 69, 98, 99, -21, 48, 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and for buffer:
[102, -32, 27, 23, 31, 111, -43, 124, 105, -122, 89, 13, 80, 62, 107, -21, 44, -93, -24, 100, -28, 18, -10, -55, 8, -7, 95, -82, -127, -125, -13, -14, 82, 93, -112, 33, 5, -43, 82, -89, -60, 111, 61, 5, 65, 1, -105, -65, -77, -119, 126, -118, -67, 32, -115, 106, -10, 75, 44, 101, 60, -110, -71, -27, 44, -111, 83, 83, 99, -25, -71, 12, -101, -35, -79, -115, 99, 107, 21, 118, -52, -107, -51, -122, 106, 12, 43, 23, 111, -60, -79, -20, 57, -28, 99, -106, -87, 74, -18, 71, 44, -26, -6, 80, -124, 34, -69, 27, 46, -15, -97, -71, 84, 30, -121, -36, 65, -46, 66, -34, 69, -127, -16, 100, 114, 38, -110, -24, -34, 82, 69, -75, 108, 42, 83, 103, -14, -54, 10, 85, 107, -1, 42, 41, 106, 4, 65, 122, -101, -45, 19, 32, -110, 61, 53, 73, -97, -119, -63, 96, 55, -103, -59, -84, -35, -64, 47, -58, -38, 8, 9, 3, 82, -109, -78, 124, 69, -2, -74, -55, 72, -26, 33, -110, 92, -48, 87, 81, 39, 95, -45, 121, -82, -75, -79, -104, 93, 37, -118, 108, 20, -49, -96, 74, -120, -89, 110, -36, 115, 69, 98, 99, -21, 48, 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所以我得到了前 1008 个字节的相同数据，之后，我什么都没有了。

知道如何解决这个问题吗？

【参考方案1】：

您是否设置了任何缓冲区大小？ 通常你会一直读到没有更多数据为止。

【讨论】：

是的，缓冲区初始化为 4096 字节

【参考方案2】：

我不得不解决一个类似的错误。唯一相关的问题是在这个线程中，仍然没有解决。所以不得不自己寻找原因和解决方案:)。

原因是 Android 蓝牙似乎以 1008 字节为一组发送数据。 因此，您需要在 while 循环中从流中读取并连接接收到的字节。

以下是您的代码应该如何重写：

byte[] buffer = new byte[4096];
ByteArrayOutputStream baos = new ByteArrayOutputStream();
int bytes;

while ((bytes = inputStream.read(buffer, 0, buffer.length)) > -1) 
          baos.write(buffer, 0, bytes);
          baos.flush();

byte[] message = baos.toByteArray();

// =================== other side =============================
byte[] message = Tools.concatByteArray(response, authorizationMessage);
outputStream.write(message);
outputStream.flush();
outputStream.close(); // <-- important! so the receiver knows that it is the end of data

【参考方案3】：

请查看Managing a Connection 部分。如您所见；

您应该使用 专用线程 进行所有流读取和 写作。这很重要，因为 read(byte[]) 和 write(byte[]) 方法是阻塞调用。 read(byte[]) 将阻塞 直到有 从流中读取的东西。 write(byte[]) 通常不会 阻止，但如果远程设备不是，则可以阻止流量控制 足够快地调用 read(byte[]) 并且中间缓冲区是 满的。所以，你在线程中的主循环应该专门用于阅读 来自 InputStream。

当我开始编写我的 Reader Thread 时，InputStream 的 read(byte[]) 方法将阻塞执行，直到有所需的字节数。但事实并非如此。我发现它确实会阻塞，直到从流中读取“某些东西”（我之前错过的部分）。

考虑你的包裹是； 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09，您通过 OutputStream 写入发送它并刷新。您可能仍会在一次 read() 调用中获得 其中的一部分（甚至 1 字节 -> 0x01），并在下一次 read() 调用中获得其余部分（0x02 和其余部分） .在这种情况下，read() 的返回值将等于 1，incomingBytes[0] 将为 0x01，其他元素将为 0

【讨论】：

以及如何确定我们期望的消息何时完成？！如果我等待 9 个字节，我得到 1，然后是 8，但下一次是 9，下一次是 4，然后是 6，然后是 8，然后是正确的 9，依此类推......？！？！在我使用的协议中很有趣，我可以使用 crc 验证，但是当我收到如此切割的消息时，crc 没有意义，直到我确定我有一条完整的消息......所以我需要实现切割、移动、加入字节的逻辑数组和消息每秒发送 200 多次... :( 有什么帮助吗？

@Ewoks 没错。我们使用的包大小超过 8 字节，后来，出于效率考虑，它扩展得更多。因此，除非您的包大小为 1 字节，否则您将永远不会后悔实现所需的逻辑。我实现了一个类似于功能类的流，收集所有字节，在收到所有包时将它们转换为固定大小的包，然后抛出完整的包来清理相关字节。这样，即使您在单个 inputStream.read() 中收到 1 字节或 2 个包（使用 8 字节的包大小很有可能），您也会得到 2 个包或根本没有......