我想创建一个刚刚起步的蓝牙，创建一个服务器套接字，等待一些设备连接，并接受连接一个服务器程序。

的onclick（）方法启动蓝牙，然后我打电话AcceptThread（）方法创建一个服务器套接字，并开始收听。然后运行（）被调用，它接受一个连接。

但它不工作。我的应用程序只是停止。知道为什么吗？

在code为如下：

 公共类MainActivity延伸活动{

    公共BluetoothAdapter mBluetoothAdapter;
    私人BluetoothServerSocket mmServerSocket;
    私有静态最后UUID MY_UUID_SECURE = UUID.fromString（00001101-0000-1000-8000-00805F9B34FB）;

    TextView的文字;
    @覆盖
    保护无效的onCreate（包savedInstanceState）{
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.activity_main）;
        文=（TextView的）findViewById（R.id.textView1）;
    }

    @覆盖
    公共布尔onCreateOptionsMenu（功能菜单）{
        。getMenuInflater（）膨胀（R.menu.main，菜单）;
        返回true;
    }

    公共无效的onClick（视图查看）{
        开关（view.getId（））{
        案例R.id.button1：

            mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter（）;
            如果（mBluetoothAdapter == NULL）{
                text.setText（不支持蓝牙）;
                返回;
            }

            意图discoverableIntent =新
            意图（BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE）;
            discoverableIntent.putExtra（BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION，300）;
            startActivity（discoverableIntent）;
            text.setText（可见!!）;

            AcceptThread（）;
            跑（）;

        }
    }

    公共无效changeT（字符串str）
    {
        text.setText（STR）;
    }

    公共无效AcceptThread（）{
        BluetoothServerSocket TMP = NULL;
        尝试 {
            TMP = mBluetoothAdapter.listenUsingRfcommWithServiceRecord（MYYAPP，MY_UUID_SECURE）​​;

        }赶上（IOException异常E）{}
        mmServerSocket = TMP;
    }

    公共无效的run（）{
        的BluetoothSocket插座= NULL;
        而（真）{
            尝试 {
                插座= mmServerSocket.accept（）;
                changeT（听）;
            }赶上（IOException异常E）{
                打破;
            }
            如果（插座！= NULL）{
                changeT（doneeeee）;
                尝试 {
                    mmServerSocket.close（）;
                }赶上（IOException异常E）{
                    e.printStackTrace（）;
                }
                打破;
            }
        }
    }
}
 

作为请求的布局：

 ＆LT; RelativeLayout的的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android
    的xmlns：工具=htt​​p://schemas.android.com/tool​​s
    机器人：layout_width =match_parent
    机器人：layout_height =match_parent
    机器人：paddingBottom会=@扪/ activity_vertical_margin
    机器人：以下属性来=@扪/ activity_horizo​​ntal_margin
    机器人：paddingRight =@扪/ activity_horizo​​ntal_margin
    机器人：paddingTop =@扪/ activity_vertical_margin
    工具：上下文=MainActivity。＆GT;

    ＆LT;按钮
        机器人：ID =@ + ID /按钮1
        机器人：layout_width =WRAP_CONTENT
        机器人：layout_height =WRAP_CONTENT
        机器人：layout_alignParentLeft =真
        机器人：layout_alignParentTop =真
        机器人：layout_marginLeft =60dp
        机器人：layout_marginTop =31dp
        机器人：文本=@字符串/而是
        机器人：的onClick =的onClick/＆GT;

    ＆LT;的TextView
        机器人：ID =@ + ID / textView1
        机器人：layout_width =WRAP_CONTENT
        机器人：layout_height =WRAP_CONTENT
        机器人：layout_alignParentTop =真
        机器人：layout_alignRight =@ + ID /按钮1
        机器人：layout_marginRight =43dp
        机器人：layout_marginTop =15dp
        机器人：文本=@字符串/输出/＆GT;

＆LT; / RelativeLayout的＆GT;
 

解决方案

问题是AcceptThread（）和run（）函数中运行适配器可以开启之前。 在AcceptThread前单线（）解决了这个。

 而（mmServerSocket == NULL）;
 

此外，RUN（）必须在不同的线程中运行。

I am trying to create a server program that just starts bluetooth, creates a server socket, waits for some device to connect and accepts the connection.

The onClick() method starts the bluetooth, then I call the AcceptThread() method to create a server socket and start listening. Then run() is called which accepts a connection.

But it is not working. My app just stops. Any idea why?

The code is given below:

public class MainActivity extends Activity {

    public BluetoothAdapter mBluetoothAdapter;
    private BluetoothServerSocket mmServerSocket;
    private static final UUID MY_UUID_SECURE = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");

    TextView text;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        text=(TextView)findViewById(R.id.textView1);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    public void onClick(View view) {
        switch (view.getId()) {
        case R.id.button1:

            mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
            if (mBluetoothAdapter == null) {
                text.setText("Does not support bluetooth");
                return;
            }

            Intent discoverableIntent = new
            Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
            discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);
            startActivity(discoverableIntent);
            text.setText("Discoverable!!");

            AcceptThread();
            run();

        }
    }

    public void changeT(String str)
    {
        text.setText(str);
    }

    public void AcceptThread() {
        BluetoothServerSocket tmp = null;
        try {
            tmp = mBluetoothAdapter.listenUsingRfcommWithServiceRecord("MYYAPP", MY_UUID_SECURE);

        } catch (IOException e) { }
        mmServerSocket = tmp;
    }

    public void run() {
        BluetoothSocket socket = null;
        while (true) {
            try {
                socket = mmServerSocket.accept();
                changeT("listening");
            } catch (IOException e) {
                break;
            }
            if (socket != null) {
                changeT("doneeeee");
                try {
                    mmServerSocket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                break;
            }
        }
    }   
}

The layout as requested:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="60dp"
        android:layout_marginTop="31dp"
        android:text="@string/but" 
        android:onClick="onClick"/>

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_alignRight="@+id/button1"
        android:layout_marginRight="43dp"
        android:layout_marginTop="15dp"
        android:text="@string/Output" />

</RelativeLayout>

The problem was the AcceptThread() and run() functions were running before the adapter could be turned on. A single line before the AcceptThread() solved this.

while(mmServerSocket==null);

Also, run() has to be run in a different thread.