我只是试图通过蓝牙套接字进行读写,但我的readBytes调用未完成。我认为这很简单,但也许我只是使用了错误类型的流或其他内容。截至目前,我的代码仅发送少量文本作为字节。这是占位符代码,将替换为通过流写入和读取文件的代码。这是我的接收线程:
class ReceiveThread(val inStream:BufferedInputStream):Thread() {
var bytes:ByteArray? = null
override fun run() {
BluetoothService.log("Begin ${BTS_Constants.THREAD_RECEIVE}")
BluetoothService.log("preparing to read data")
name = BTS_Constants.THREAD_RECEIVE
//here is my new code
inStream.use {
do{
count++
BluetoothService.log("read loop round $count")
byteList.add(it.read() as Byte)
}while (it.available()>0)
}
BluetoothService.log("data read: ${byteList.get(0) as Char}")
}
}
这是我的发送线程:
class SendThread(val outStream:BufferedOutputStream, val file:File? = null):Thread(){
var bytes:ByteArray? = null
override fun run() {
BluetoothService.log("Begin : ${BTS_Constants.THREAD_SEND}")
name = BTS_Constants.THREAD_SEND
bytes = "hello testing".toByteArray()
try{
outStream.use {
it.write(bytes)
it.flush()
}
}catch (ioe:IOException){
}
BluetoothService.log("data sent")
}
}
数据已成功发送,并且
BluetoothService.log("data sent")
调用已到达并在运行发送线程的设备的logcat中显示。对于运行“接收线程”的设备,将记录“正在准备读取数据”消息,但从不记录data read: "$bytes message"
。我如何才能完成对inStream.readBytes()的调用?
编辑:我收到的新错误消息:
11-27 23:45:29.298 16253-16413/com.example.zemcd.fileblue E/AndroidRuntime: FATAL EXCEPTION: RECEIVE
Process: com.example.zemcd.fileblue, PID: 16253
java.io.IOException: bt socket closed, read return: -1
at android.bluetooth.BluetoothSocket.read(BluetoothSocket.java:588)
at android.bluetooth.BluetoothInputStream.read(BluetoothInputStream.java:96)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:235)
at java.io.BufferedInputStream.read(BufferedInputStream.java:254)
at com.example.zemcd.fileblue.ReceiveThread.run(BluetoothService.kt:230)
最佳答案
如果查看Kotlin扩展功能 readBytes
的源代码,您会发现它在InputStream.read(buffer) > 0
时开始循环。根据documentation:
此循环的第二次迭代将冻结您的程序。
所以不要使用readBytes
方法。只是read(buffer)
。
例如-https://developer.android.com/guide/topics/connectivity/bluetooth.html#ManagingAConnection
更新:
现在ReceiveThread
可以从流中接收一条消息。但是您的蓝牙 socket 很近。因此,您的问题出在设置蓝牙连接和inStream
的初始化中。也许您发送的部分也有误。