获取java.io.IOException:读取失败，套接字可能关闭或超时，通过蓝牙打印机打印时读取ret：-1
获取java.io.IOException:读取失败，套接字可能关闭或超时，通过蓝牙打印机打印时读取ret：-1
提问于 2015-09-02 23:31:57
代码只在第一次工作正常，如果我再次尝试连接它，它会抛出这个异常：
读取失败，套接字可能关闭或超时，读取ret：-1
这是我用来连接蓝牙打印机的函数：
public boolean openBT(Context context) throws IOException {
try {
// Standard SerialPortService ID
UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805f9b34fb");
mmSocket = mmDevice.createRfcommSocketToServiceRecord(uuid);
mBluetoothAdapter.cancelDiscovery();
mmSocket.connect();
mmOutputStream = new DataOutputStream(mmSocket.getOutputStream());
mmInputStream = new DataInputStream(mmSocket.getInputStream());
} catch (NullPointerException e) {
e.printStackTrace();
return false;
} catch (Exception e) {
e.printStackTrace();
return false;
}
return true;
}回答 2
Stack Overflow用户
发布于 2015-09-02 23:36:40
您应该在使用后关闭您的socket：
public boolean openBT(Context context) throws IOException {
try {
// Standard SerialPortService ID
UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805f9b34fb");
mmSocket = mmDevice.createRfcommSocketToServiceRecord(uuid);
mBluetoothAdapter.cancelDiscovery();
mmSocket.connect();
mmOutputStream = new DataOutputStream(mmSocket.getOutputStream());
mmInputStream = new DataInputStream(mmSocket.getInputStream());
mmSocket.close(); //Socket closed
} catch (NullPointerException e) {
e.printStackTrace();
return false;
} catch (Exception e) {
e.printStackTrace();
return false;
}
return true;}Stack Overflow用户
发布于 2018-08-25 05:23:47
如果您不知道UUID，请检查您的UUID并尝试执行以下操作：
UUID uuidSting = null;
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1) {
uuidSting = bluetoothDevice.getUuids()[0].getUuid();
}请改用：
UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805f9b34fb");页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/32357306
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