android java.io.IOException:未连接传输终结点
我需要向蓝牙设备发送一个字符串。但在发送时,我在android java.io.IOException:未连接传输终结点,java,android,bluetooth,Java,Android,Bluetooth,我需要向蓝牙设备发送一个字符串。但在发送时,我在java.io.OutputStream.write(byte[])方法上得到一个Exeptionjava.io.IOException:Transport端点未连接 代码如下所示。代码只是从配对设备列表和发送字符串中搜索特定设备 public class MainActivity extends Activity { TextView out; private static final int REQUEST_ENABLE_BT
java.io.OutputStream.write(byte[])
方法上得到一个Exeptionjava.io.IOException:Transport端点未连接
代码如下所示。代码只是从配对设备列表和发送字符串中搜索特定设备
public class MainActivity extends Activity {
TextView out;
private static final int REQUEST_ENABLE_BT = 1;
private BluetoothAdapter btAdapter;
private ArrayList<BluetoothDevice> btDeviceList = new ArrayList<BluetoothDevice>();
private ArrayAdapter<String> mPairedDevicesArrayAdapter;
private ArrayAdapter<String> mNewDevicesArrayAdapter;
BluetoothDevice device1;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
out = (TextView) findViewById(R.id.out);
btAdapter = BluetoothAdapter.getDefaultAdapter();
ListpairedDevices();
}
/* This routine is called when an activity completes. */
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == REQUEST_ENABLE_BT) {
CheckBTState();
}
}
public void ListpairedDevices() {
Set<BluetoothDevice> pairedDevices = btAdapter.getBondedDevices();
// If there are paired devices, add each one to the ArrayAdapter
if (pairedDevices.size() > 0) {
out.append("\nPaired Devices \n");
for (BluetoothDevice device : pairedDevices) {
out.append("\n Device123: " + device.getName() + "," + device);
//mPairedDevicesArrayAdapter.add("\n Device123: " + device.getName() + "," + device);
String dv=device.toString();
if(dv.contains("00:1B:EE:82:31:1E"))
{
device1=device;
}
}
} else {
out.append("\nNo Pared Device");
}
out.append("\nDiscovered Devices");
}
public void sendtext(View v) {//button click
Set<BluetoothDevice> bd=btAdapter.getBondedDevices();
sendDataToPairedDevice("message1");
}
private void sendDataToPairedDevice(String message ){
byte[] toSend = message.getBytes();
try {
UUID applicationUUID = UUID.fromString("8ce255c0-200a-11e0-ac64-0800200c9a66");
BluetoothSocket socket = device1.createInsecureRfcommSocketToServiceRecord(applicationUUID);
OutputStream mmOutStream = socket.getOutputStream();
mmOutStream.write(toSend);
} catch (IOException e) {
Log.e( "Exception during write", e.toString());
}
}
}
公共类MainActivity扩展活动{
文本视图输出;
私有静态最终整数请求_ENABLE_BT=1;
私人蓝牙适配器;
private ArrayList btDeviceList=新ArrayList();
专用阵列适配器MPairedevicesArrayaAdapter;
专用阵列适配器mNewDevicesArrayAdapter;
蓝牙设备1;
/**在首次创建活动时调用*/
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
out=(TextView)findViewById(R.id.out);
btAdapter=BluetoothAdapter.getDefaultAdapter();
ListpairedDevices();
}
/*此例程在活动完成时调用*/
@凌驾
受保护的void onActivityResult(int请求代码、int结果代码、意图数据){
super.onActivityResult(请求代码、结果代码、数据);
if(requestCode==请求启用){
CheckBTState();
}
}
公共作废ListpairedDevices(){
Set pairedDevices=btAdapter.getBondedDevices();
//如果存在配对设备,请将每个设备添加到ArrayAdapter
如果(pairedDevices.size()>0){
out.append(“\n需要的设备\n”);
用于(蓝牙设备:pairedDevices){
out.append(“\n Device123:“+device.getName()+”,“+device”);
//MPairedDeviceArrayaAdapter.add(“\n Device123:“+device.getName()+”,“+device”);
字符串dv=device.toString();
如果(dv.包含(“00:1B:EE:82:31:1E”))
{
设备1=设备;
}
}
}否则{
out.append(“\n无配置设备”);
}
out.append(“\n发现的设备”);
}
公共void sendtext(视图v){//按钮单击
Set bd=btAdapter.getBondedDevices();
sendDataToPairedDevice(“消息1”);
}
私有void sendDataToPairedDevice(字符串消息){
字节[]toSend=message.getBytes();
试一试{
UUID applicationuid=UUID.fromString(“8ce255c0-200a-11e0-ac64-0800200c9a66”);
BluetoothSocket=device1.CreateSecurerCommsocketToServiceRecord(ApplicationUID);
OutputStream mmOutStream=socket.getOutputStream();
mmOutStream.write(toSend);
}捕获(IOE异常){
Log.e(“写入期间异常”,例如toString());
}
}
}
编辑:
您需要连接到套接字,然后才需要取消查找
btAdapter.cancelDiscovery();
socket.connect();
UUID为Kiran K J is工作
000011105-0000-1000-8000-00805F9B34FB
您尚未获得蓝牙适配器,您刚刚声明了它
使用静态工厂方法获取这样的蓝牙适配器
将此添加到onCreate中
btAdapter=BluetoothAdapter.getDefaultAdapter();
这是集合pairedDevices=btAdapter.getBondedDevices();listpaireddevice()方法的第一行您已经使用了adatper,但尚未获取适配器您已经声明了adatper,但它为null,因为您尚未获取它的对象。。在调用listpaireddevices()方法之前,将我发布的代码放在OnCreate方法中。这不是问题。在复制粘贴时,我忘记在stackoverflow中添加行。错误仍然相同。uuid是否有任何问题。我只是复制粘贴一个垃圾uuid。但设备地址是正确的。获取套接字后调用socket.connect()