我在使用 Android 蓝牙打印机时遇到了一个奇怪的问题。当我第一次尝试连接打印机设备时，我遇到了以下问题
BluetoothAdapter: getBluetoothService() called with no BluetoothManagerCallback
java.io.IOException: read failed, socket might closed or timeout, read ret: -1
at android.bluetooth.BluetoothSocket.readAll(BluetoothSocket.java:738)
at android.bluetooth.BluetoothSocket.readInt(BluetoothSocket.java:750)
at android.bluetooth.BluetoothSocket.connect(BluetoothSocket.java:375)
我正在使用以下代码将设备与打印机连接
Thread connectThread = new Thread(new Runnable() {
@Override
public void run() {
try {
boolean gotuuid = btDevices.getItem(position)
.fetchUuidsWithSdp();
UUID uuid = btDevices.getItem(position).getUuids()[0]
.getUuid();
mbtSocket = btDevices.getItem(position)
.createRfcommSocketToServiceRecord(uuid);
mbtSocket.connect();
} catch (IOException ex) {
ex.printStackTrace();
runOnUiThread(socketErrorRunnable);
try {
mbtSocket.close();
} catch (IOException e) {
e.printStackTrace();
}
mbtSocket = null;
} finally {
runOnUiThread(new Runnable() {
@Override
public void run() {
finish();
}
});
}
}
});
connectThread.start();
注意：一旦我尝试调试上面的代码块，它将与打印机连接并能够打印。只有普通模式的问题。
任何人都对同样的问题有任何想法。