Java 在没有BluetoothManagerCallback的情况下调用getBluetoothService（）可以做什么？

您好，我想写一个Android java应用程序，可以连接蓝牙设备，但我得到错误：

W/BluetoothAdapter﹕ getBluetoothService() called with no BluetoothManagerCallback

我使用安卓版本4.4.4的Nexus5设备

这是我的密码：

package com.example.tarasov.bluetoothexample;

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.view.Menu;
import android.view.MenuItem;
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 MyActivity extends Activity implements OnItemClickListener {

    /*
    * Deklaration
    * */

    ArrayAdapter<String> listAdapter;
    ListView listView;
    BluetoothAdapter btAdapter;
    Set<BluetoothDevice> deviceArray;
    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, Toast.LENGTH_SHORT).show();
                    break;
            }
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_my);

        init(); //Initialisierung der Komponenten

        if(btAdapter==null)
        {
            Toast.makeText(getApplicationContext(), "Kein Bluetooth aktiviert", Toast.LENGTH_SHORT).show();
            finish();
        }
        else
        {
            if (!btAdapter.isEnabled()){

                turnOnBT();
            }

            getPairedDevices();
            startDiscovery();
        }

    }

    private void startDiscovery() {
        btAdapter.cancelDiscovery();
        btAdapter.startDiscovery();
    }

    private void turnOnBT() {
        Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
        startActivityForResult(intent,1);
    }

    private void getPairedDevices() {

        deviceArray = btAdapter.getBondedDevices();
        if (deviceArray.size()>0){
            for (BluetoothDevice device:deviceArray){
                pairedDevices.add(device.getName());

            }
        }
    }

    private void init(){

        listView = (ListView)findViewById(R.id.listView); //bindet 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) {
                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))){

                            s = "(Verbunden)";
                            break;
                        }
                    }

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

                else if (BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)){

                }
                else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)){


                }
                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() {
        super.onPause();

        unregisterReceiver(receiver);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (resultCode==RESULT_CANCELED){

            Toast.makeText(getApplicationContext(), "Bluetooth muss erst aktiviert werden", Toast.LENGTH_SHORT).show();
            finish();
        }
    }

    @Override
    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {

        if (btAdapter.isDiscovering()){
            btAdapter.cancelDiscovery();
        }

        if (listAdapter.getItem(arg2).contains("Verbunden")){

            BluetoothDevice selectedDevice = devices.get(arg2);
            ConnectThread connect = new ConnectThread(selectedDevice);
            connect.start();
            Log.i(tag, "in click listener");
        }
        else
        {
            Toast.makeText(getApplicationContext(), "Gerät ist nicht verbunden", Toast.LENGTH_SHORT).show();
        }
    }

    /*
    * Hilfsklassen
    * */

    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.tarasov.bluetoothexample；
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.view.Menu；
导入android.view.MenuItem；
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MyActivity扩展活动实现了McClickListener{
/*
*脱克拉
* */
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，Toast.LENGTH_SHORT）.show（）；
打破
}
}
};
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_my）；
init（）；//初始化Komponenten
if（btAdapter==null）
{
Toast.makeText（getApplicationContext（），“Kein Bluetooth aktiviert”，Toast.LENGTH_SHORT）.show（）；
完成（）；
}
其他的
{
如果（！btAdapter.isEnabled（））{
turnOnBT（）；
}
getPairedDevices（）；
startDiscovery（）；
}
}
私有无效开始发现（）{
btAdapter.cancelDiscovery（）；
btAdapter.startDiscovery（）；
}
私有无效转换{
意向意向=新意向（BluetoothAdapter.ACTION\u REQUEST\u ENABLE）；
startActivityForResult（意向，1）；
}
私有void getPairedDevices（）{
deviceArray=btAdapter.getBondedDevices（）；
如果（deviceArray.size（）>0）{
用于（蓝牙设备：deviceArray）{
pairedDevices.add（device.getName（））；
}
}
}
私有void init（）{
listView=（listView）findViewById（R.id.listView）；//bindet 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）{
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