Android蓝牙连接SPP后断开会出现IOException异常

[dztai]

Android蓝牙连接SPP后断开会出现IOException异常， log如下

E/BluetoothSocket(5549): java.io.IOException: Operation Canceled
E/BluetoothSocket(5549): 	at android.bluetooth.BluetoothSocket.readNative(Native Method)
E/BluetoothSocket(5549): 	at android.bluetooth.BluetoothSocket.read(BluetoothSocket.java:386)
E/BluetoothSocket(5549): 	at android.bluetooth.BluetoothInputStream.read(BluetoothInputStream.java:96)
E/BluetoothSocket(5549): 	at java.io.InputStream.read(InputStream.java:163)
E/BluetoothSocket(5549): 	at com.adayome.hudsettingdemo.bt.BluetoothConnection$5.run(BluetoothConnection.java:335)

整个逻辑是这样的，连接SPP后，开启一个线程一直在read数据，

private class readThread extends Thread {
		public void run() {

			byte[] buffer = new byte[1024];
			int bytes;
			InputStream mmInStream = null;
			try {
				mmInStream = GlobalVariables.sSocket.getInputStream();
			} catch (IOException e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			}
			while (!isInterrupted()) {
				try {
					// Read from the InputStream
					if ((bytes = mmInStream.read(buffer)) > 0) {

						byte[] buf_data = new byte[bytes];
						for (int i = 0; i < bytes; i++) {
							buf_data[i] = buffer[i];
						}
						String s = new String(buf_data);
						LogUtils.i("readThread---------------2 s = " + s);
						if (s.trim().equals("exit"))
							break;
						Message msg = new Message();
						msg.obj = s;
						msg.what = 1;
						LinkDetectedHandler.sendMessage(msg);
					}
				} catch (IOException e) {
					try {
						mmInStream.close();
					} catch (IOException e1) {
						// TODO Auto-generated catch block
						e1.printStackTrace();
					}
					break;
				}
			}
		}
	}

在退出时会中断这个线程和关闭相应的Socket

if (mReadThread != null) {
			mReadThread.interrupt();
			mReadThread = null;
		}

		if (GlobalVariables.sSocket != null) {
			try {
				InputStream in = GlobalVariables.sSocket.getInputStream();
				OutputStream ou = GlobalVariables.sSocket.getOutputStream();
				
				ou.close();
				in.close();
				GlobalVariables.sSocket.close();

			} catch (IOException e) {
				LogUtils.debugLog(e);
			}

			GlobalVariables.sSocket = null;
		}

此时就会报上面的 java.io.IOException: Operation Canceled
各位大神有什么好的解决办法吗？
有什么办法可以中止I/O阻塞的线程？或是让read返回-1？

[lucky_tom]

mReadThread.interrupt();是否中断了线程呢？最好使用标志位来消亡线程。 boolean flag = true; while (flag) { } 销毁时：flag = false;

[dztai]

用标志位也不行的，因为read是I/O阻塞的，当前线程就停在 if ((bytes = mmInStream.read(buffer)) > 0)这一句，无法往下走，即使标志位为false也不会立刻执行

[dztai]

找到一种解决办法，如下：

	private class ReadThread extends Thread {

		@Override
		public void run() {
			InputStream inStream = null;
			while (isRunning) {
				int size;
				try {
					byte[] buffer = new byte[1024];
					try {
						Thread.sleep(10);
					} catch (InterruptedException e) {
						// TODO Auto-generated catch block
					}
					if (mSocket == null) {
						break;
					}
					inStream = mSocket.getInputStream();
					int available = inStream.available();
					if (available != 0) {
						size = inStream.read(buffer);
						if (size > 0 && mListener != null) {
							mListener.onDataReceived(buffer, size);
						}
					}
				} catch (IOException e) {
					try {
						if (inStream != null)
							inStream.close();
					} catch (IOException e1) {
						// TODO Auto-generated catch block
						e1.printStackTrace();
					}
				}catch (NullPointerException e){
					LogUtils.e(e.getMessage());
				}
			}
			LogUtils.i("-----ReadThread is exit");
			closeSocket();
		}
	}

主要是利用 inStream = mSocket.getInputStream(); int available = inStream.available(); 这段代码来判断是否有数据再去读取。