通过蓝牙编程连接两台Android设备

我正试图通过蓝牙从我的一个设备到另一个设备获取数据

我以前曾尝试从android网站运行bluetoothChat示例代码，但没有成功

现在，我继续研究我找到的这段代码，虽然它在我的设备上编译，但它们之间并没有连接

有人看到下面的代码有什么问题吗？如果有人知道android上蓝牙的一些好资源，如果他们能与我分享，我将不胜感激

package com.example.bluetooth;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Set;
import java.util.UUID;

import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends Activity implements OnItemClickListener {

ArrayAdapter<String> listAdapter;
ListView listView;
BluetoothAdapter btAdapter;
Set<BluetoothDevice> devicesArray;
ArrayList<String> pairedDevices;
ArrayList<BluetoothDevice> devices;
public static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
protected static final int SUCCESS_CONNECT = 0;
protected static final int MESSAGE_READ = 1;
IntentFilter filter;
BroadcastReceiver receiver;
String tag = "debugging";
Handler mHandler = new Handler(){
    @Override
    public void handleMessage(Message msg) {
        // TODO Auto-generated method stub
        Log.i(tag, "in handler");
        super.handleMessage(msg);
        switch(msg.what){
        case SUCCESS_CONNECT:
            // DO something
            ConnectedThread connectedThread = new ConnectedThread((BluetoothSocket)msg.obj);
            Toast.makeText(getApplicationContext(), "CONNECT", Toast.LENGTH_SHORT).show();
            String s = "successfully connected";
            connectedThread.write(s.getBytes());
            Log.i(tag, "connected");
            break;
        case MESSAGE_READ:
            byte[] readBuf = (byte[])msg.obj;
            String string = new String(readBuf);
            Toast.makeText(getApplicationContext(), string, 0).show();
            break;
        }
    }
};
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    init();
    if(btAdapter==null){
        Toast.makeText(getApplicationContext(), "No bluetooth detected", 0).show();
        finish();
    }
    else{
        if(!btAdapter.isEnabled()){
            turnOnBT();
        }

        getPairedDevices();
        startDiscovery();//
    }


}

public void resumeDiscovery(View view){
    btAdapter.cancelDiscovery();
    btAdapter.startDiscovery();
}

private void startDiscovery() {
    // TODO Auto-generated method stub
    btAdapter.cancelDiscovery();
    btAdapter.startDiscovery();

}
private void turnOnBT() {
    // TODO Auto-generated method stub
    Intent intent =new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
    startActivityForResult(intent, 1);
}
private void getPairedDevices() {
    // TODO Auto-generated method stub
    devicesArray = btAdapter.getBondedDevices();
    if(devicesArray.size()>0){
        for(BluetoothDevice device:devicesArray){
            pairedDevices.add(device.getName());

        }
    }
}
private void init() {
    // TODO Auto-generated method stub
    listView=(ListView)findViewById(R.id.listView);
    listView.setOnItemClickListener(this);
    listAdapter= new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,0);
    listView.setAdapter(listAdapter);
    btAdapter = BluetoothAdapter.getDefaultAdapter();
    pairedDevices = new ArrayList<String>();
    filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
    devices = new ArrayList<BluetoothDevice>();
    receiver = new BroadcastReceiver(){
        @Override
        public void onReceive(Context context, Intent intent) {
            // TODO Auto-generated method stub
            String action = intent.getAction();

            if(BluetoothDevice.ACTION_FOUND.equals(action)){
                BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                devices.add(device);
                String s = "";
                for(int a = 0; a < pairedDevices.size(); a++){
                    if(device.getName().equals(pairedDevices.get(a))){
                        //append 
                        s = "(Paired)";
                        break;
                    }
                }

                listAdapter.add(device.getName()+" "+s+" "+"\n"+device.getAddress());
            }

            else if(BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)){
                // run some code
            }
            else if(BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)){
                // run some code



            }
            else if(BluetoothAdapter.ACTION_STATE_CHANGED.equals(action)){
                if(btAdapter.getState() == btAdapter.STATE_OFF){
                    turnOnBT();
                }
            }

        }
    };

    registerReceiver(receiver, filter);
     filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_STARTED);
    registerReceiver(receiver, filter);
     filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
    registerReceiver(receiver, filter);
     filter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
    registerReceiver(receiver, filter);
}


@Override
protected void onPause() {
    // TODO Auto-generated method stub
    super.onPause();
    unregisterReceiver(receiver);
}

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // TODO Auto-generated method stub
        super.onActivityResult(requestCode, resultCode, data);
        if(resultCode == RESULT_CANCELED){
            Toast.makeText(getApplicationContext(), "Bluetooth must be enabled to continue", Toast.LENGTH_SHORT).show();
            finish();
        }
    }
    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
            long arg3) {
        // TODO Auto-generated method stub
        BluetoothDevice selectedDevice = devices.get(arg2);
        if(btAdapter.isDiscovering()){
            btAdapter.cancelDiscovery();
        }
        if(listAdapter.getItem(arg2).contains("Paired")){


            ConnectThread connect = new ConnectThread(selectedDevice);
            connect.start();
            Log.i(tag, "in click listener");
        }
        else{
            Toast.makeText(getApplicationContext(), "pairing", 0).show();
            //pair device
        }
    }

    private class ConnectThread extends Thread {

        private final BluetoothSocket mmSocket;
        private final BluetoothDevice mmDevice;

        public ConnectThread(BluetoothDevice device) {
            // Use a temporary object that is later assigned to mmSocket,
            // because mmSocket is final

            BluetoothSocket tmp = null;
            mmDevice = device;
            Log.i(tag, "construct");
            // Get a BluetoothSocket to connect with the given BluetoothDevice
            try {
                // MY_UUID is the app's UUID string, also used by the server code
                tmp = device.createRfcommSocketToServiceRecord(MY_UUID);
            } catch (IOException e) { 
                Log.i(tag, "get socket failed");

            }
            mmSocket = tmp;
        }



        public void run() {
            // Cancel discovery because it will slow down the connection
            btAdapter.cancelDiscovery();
            Log.i(tag, "connect - run");

            try {
                // Connect the device through the socket. This will block
                // until it succeeds or throws an exception
                mmSocket.connect();
                Log.i(tag, "connect - succeeded");
            } catch (IOException connectException) {    Log.i(tag, "connect failed");
                // Unable to connect; close the socket and get out
                try {
                    mmSocket.close();
                } catch (IOException closeException) { }
                return;
            }

            // Do work to manage the connection (in a separate thread)

            mHandler.obtainMessage(SUCCESS_CONNECT, mmSocket).sendToTarget();
        }



        /** Will cancel an in-progress connection, and close the socket */
        public void cancel() {
            try {
                mmSocket.close();
            } catch (IOException e) { }
        }
    }

    private class ConnectedThread extends Thread {
        private final BluetoothSocket mmSocket;
        private final InputStream mmInStream;
        private final OutputStream mmOutStream;

        public ConnectedThread(BluetoothSocket socket) {
            mmSocket = socket;
            InputStream tmpIn = null;
            OutputStream tmpOut = null;

            // Get the input and output streams, using temp objects because
            // member streams are final
            try {
                tmpIn = socket.getInputStream();
                tmpOut = socket.getOutputStream();
            } catch (IOException e) { }

            mmInStream = tmpIn;
            mmOutStream = tmpOut;
        }

        public void run() {
            byte[] buffer;  // buffer store for the stream
            int bytes; // bytes returned from read()

            // Keep listening to the InputStream until an exception occurs
            while (true) {
                try {
                    // Read from the InputStream
                    buffer = new byte[1024];
                    bytes = mmInStream.read(buffer);
                    // Send the obtained bytes to the UI activity
                    mHandler.obtainMessage(MESSAGE_READ, bytes, -1, buffer)
                            .sendToTarget();

                } catch (IOException e) {
                    break;
                }
            }
        }

        /* Call this from the main activity to send data to the remote device */
        public void write(byte[] bytes) {
            try {
                mmOutStream.write(bytes);
            } catch (IOException e) { }
        }

        /* Call this from the main activity to shutdown the connection */
        public void cancel() {
            try {
                mmSocket.close();
            } catch (IOException e) { }
        }
    }
}

package com.example.bluetooth；
导入java.io.IOException；
导入java.io.InputStream；
导入java.io.OutputStream；
导入java.util.ArrayList；
导入java.util.Set；
导入java.util.UUID；
导入android.app.Activity；
导入android.bluetooth.BluetoothAdapter；
导入android.bluetooth.bluetooth设备；
导入android.bluetooth.BluetoothSocket；
导入android.content.BroadcastReceiver；
导入android.content.Context；
导入android.content.Intent；
导入android.content.IntentFilter；
导入android.os.Bundle；
导入android.os.Handler；
导入android.os.Message；
导入android.util.Log；
导入android.view.view；
导入android.widget.AdapterView；
导入android.widget.AdapterView.OnItemClickListener；
导入android.widget.ArrayAdapter；
导入android.widget.ListView；
导入android.widget.Toast；
公共类MainActivity扩展活动实现了McClickListener{
阵列适配器；
列表视图列表视图；
蓝牙适配器；
设置设备阵列；
阵列列表对设备；
阵列列表设备；
公共静态最终UUID MY_UUID=UUID.fromString（“00001101-0000-1000-8000-00805F9B34FB”）；
受保护的静态最终int成功连接=0；
受保护的静态最终int消息_READ=1；
过滤器；
广播接收机；
String tag=“调试”；
Handler mHandler=新处理程序（）{
@凌驾
公共无效handleMessage（消息消息消息）{
//TODO自动生成的方法存根
Log.i（标记“in handler”）；
超级handleMessage（msg）；
开关（msg.what）{
成功案例(u CONNECT):
//做点什么
ConnectedThread ConnectedThread=新的ConnectedThread（（BluetoothSocket）msg.obj）；
Toast.makeText（getApplicationContext（），“CONNECT”，Toast.LENGTH\u SHORT.show（）；
字符串s=“已成功连接”；
connectedThread.write（s.getBytes（））；
Log.i（标记“已连接”）；
打破
案例信息如下：
字节[]readBuf=（字节[]）msg.obj；
字符串字符串=新字符串（readBuf）；
Toast.makeText（getApplicationContext（），string，0.show（）；
打破
}
}
};
@凌驾
创建时的公共void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_main）；
init（）；
if（btAdapter==null）{
Toast.makeText（getApplicationContext（），“未检测到蓝牙”，0.show（）；
完成（）；
}
否则{
如果（！btAdapter.isEnabled（））{
turnOnBT（）；
}
getPairedDevices（）；
startDiscovery（）//
}
}
公共无效恢复发现（视图）{
btAdapter.cancelDiscovery（）；
btAdapter.startDiscovery（）；
}
私有无效开始发现（）{
//TODO自动生成的方法存根
btAdapter.cancelDiscovery（）；
btAdapter.startDiscovery（）；
}
私有无效转换{
//TODO自动生成的方法存根
意向意向=新意向（BluetoothAdapter.ACTION\u REQUEST\u ENABLE）；
startActivityForResult（意向，1）；
}
私有void getPairedDevices（）{
//TODO自动生成的方法存根
DeviceArray=btAdapter.getBondedDevices（）；
如果（DeviceArray.size（）>0）{
用于（蓝牙设备：设备阵列）{
pairedDevices.add（device.getName（））；
}
}
}
私有void init（）{
//TODO自动生成的方法存根
listView=（listView）findViewById（R.id.listView）；
setOnItemClickListener（this）；
listAdapter=newArrayAdapter（这是android.R.layout.simple\u list\u item\u 1,0）；
setAdapter（listAdapter）；
btAdapter=BluetoothAdapter.getDefaultAdapter（）；
pairedDevices=新的ArrayList（）；
筛选器=新的IntentFilter（BluetoothDevice.ACTION\u已找到）；
设备=新的ArrayList（）；
接收器=新的广播接收器（）{
@凌驾
公共void onReceive（上下文、意图）{
//TODO自动生成的方法存根
String action=intent.getAction（）；
if（BluetoothDevice.ACTION_FOUND.equals（ACTION））{
BluetoothDevice=intent.getParcelableExtra（BluetoothDevice.EXTRA\u设备）；
设备。添加（设备）；
字符串s=“”；
对于（int a=0；a