蓝牙连接错误

我对android编程有点新，但现在我想尝试编程一个应用程序，通过蓝牙连接我的手机（三星Galaxy Note 2）与电路板。我只想打开/关闭一些LED。我在电路板上使用了一个bc417调制解调器。蓝牙连接错误

我已经搜索了蓝牙的例子，但他们似乎都如此困难，我只是想要我需要的命令。但是目前我的应用程序在ListView上选择一个项目时一直崩溃。

有人可以帮我吗？

package com.test.bluetoothtest; 

import java.io.IOException; 
import java.util.ArrayList; 
import java.util.List; 
import java.util.Set; 
import java.util.UUID; 


import android.os.Bundle; 
import android.app.Activity; 
import android.bluetooth.BluetoothAdapter; 
import android.bluetooth.BluetoothDevice; 
import android.bluetooth.BluetoothSocket; 
import android.content.Intent; 
import android.view.Menu; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.ArrayAdapter; 
import android.widget.ListAdapter; 
import android.widget.ListView; 
import android.widget.Toast; 
import android.widget.AdapterView.OnItemClickListener; 
import android.bluetooth.BluetoothSocket; 

public class MainActivity extends Activity { 

private static final int REQUEST_ENABLE_BT = 1; 
private static final UUID myuuid = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"); 



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


    BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); 
    if(mBluetoothAdapter == null) 
    { 
     Toast.makeText(MainActivity.this, "Bluetooth couldn't be started.", Toast.LENGTH_SHORT).show(); 
    } 
    if(!mBluetoothAdapter.isEnabled()) 
    { 
     Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE); 
     startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT); 
     Toast.makeText(MainActivity.this, "Bluetooth started succesfully", Toast.LENGTH_SHORT).show(); 
    } 
    List<String> devicelist = new ArrayList<String>(); 

    Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices(); 
    if(pairedDevices.size() > 0) 
    { 
     for(BluetoothDevice device : pairedDevices) 
     { 
      devicelist.add(device.getName()); 

     } 
    } 
    ListAdapter adapter = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_list_item_1, devicelist); 
    final ListView lv = (ListView)findViewById(R.id.listView1); 
    lv.setAdapter(adapter); 
    lv.setOnItemClickListener(new OnItemClickListener() 
    { 
     @Override 
     public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, 
       long arg3) { 
      // TODO Auto-generated method stub 
      try 
      { 
       Toast.makeText(MainActivity.this, lv.getAdapter().getItem(arg2).toString(), Toast.LENGTH_SHORT).show(); 
       BluetoothDevice finaldevice = (BluetoothDevice) lv.getAdapter().getItem(arg2);     
       BluetoothSocket clientSocket = finaldevice.createRfcommSocketToServiceRecord(myuuid); 
       clientSocket.connect(); 
       Toast.makeText(MainActivity.this, "Connectin successful!", Toast.LENGTH_SHORT).show(); 
      } 
      catch(IOException e) 
      { 
       Toast.makeText(MainActivity.this, "Error!", Toast.LENGTH_SHORT).show(); 
      } 
     } 
    }); 
} 


@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.main, menu); 
    return true; 
}

}

目录下载：

07-10 20:38:55.115: D/AbsListView(16942): Get MotionRecognitionManager 
07-10 20:38:55.335: D/libEGL(16942): loaded /system/lib/egl/libEGL_mali.so 
07-10 20:38:55.345: D/libEGL(16942): loaded /system/lib/egl/libGLESv1_CM_mali.so 
07-10 20:38:55.345: D/libEGL(16942): loaded /system/lib/egl/libGLESv2_mali.so 
07-10 20:38:55.350: D/(16942): Device driver API match 
07-10 20:38:55.350: D/(16942): Device driver API version: 10 
07-10 20:38:55.350: D/(16942): User space API version: 10 
07-10 20:38:55.350: D/(16942): mali: REVISION=Linux-r2p4-02rel0 BUILD_DATE=Tue Oct 16 15:37:13 KST 2012 
07-10 20:38:55.400: D/OpenGLRenderer(16942): Enabling debug mode 0 
07-10 20:39:05.145: D/GestureDetector(17303): [Surface Touch Event] mSweepDown False, mLRSDCnt : -1 mTouchCnt : 2 mFalseSizeCnt:0 
07-10 20:39:05.240: D/AndroidRuntime(17303): Shutting down VM 
07-10 20:39:05.240: W/dalvikvm(17303): threadid=1: thread exiting with uncaught exception (group=0x40db82a0) 
07-10 20:39:05.245: E/AndroidRuntime(17303): FATAL EXCEPTION: main 
07-10 20:39:05.245: E/AndroidRuntime(17303): java.lang.ClassCastException: java.lang.String cannot be cast to android.bluetooth.BluetoothDevice 
07-10 20:39:05.245: E/AndroidRuntime(17303): at com.test.bluetoothtest.MainActivity$1.onItemClick(MainActivity.java:74) 
07-10 20:39:05.245: E/AndroidRuntime(17303): at android.widget.AdapterView.performItemClick(AdapterView.java:298) 
07-10 20:39:05.245: E/AndroidRuntime(17303): at android.widget.AbsListView.performItemClick(AbsListView.java:1283) 
07-10 20:39:05.245: E/AndroidRuntime(17303): at android.widget.AbsListView$PerformClick.run(AbsListView.java:3074) 
07-10 20:39:05.245: E/AndroidRuntime(17303): at android.widget.AbsListView$1.run(AbsListView.java:4147) 
07-10 20:39:05.245: E/AndroidRuntime(17303): at android.os.Handler.handleCallback(Handler.java:615) 
07-10 20:39:05.245: E/AndroidRuntime(17303): at android.os.Handler.dispatchMessage(Handler.java:92) 
07-10 20:39:05.245: E/AndroidRuntime(17303): at android.os.Looper.loop(Looper.java:137) 
07-10 20:39:05.245: E/AndroidRuntime(17303): at android.app.ActivityThread.main(ActivityThread.java:4898) 
07-10 20:39:05.245: E/AndroidRuntime(17303): at java.lang.reflect.Method.invokeNative(Native Method) 
07-10 20:39:05.245: E/AndroidRuntime(17303): at java.lang.reflect.Method.invoke(Method.java:511) 
07-10 20:39:05.245: E/AndroidRuntime(17303): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1008) 
07-10 20:39:05.245: E/AndroidRuntime(17303): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:775) 
07-10 20:39:05.245: E/AndroidRuntime(17303): at dalvik.system.NativeStart.main(Native Method) 
07-10 20:41:33.045: D/AbsListView(18494): Get MotionRecognitionManager 
07-10 20:41:33.155: D/libEGL(18494): loaded /system/lib/egl/libEGL_mali.so 
07-10 20:41:33.160: D/libEGL(18494): loaded /system/lib/egl/libGLESv1_CM_mali.so 
07-10 20:41:33.165: D/libEGL(18494): loaded /system/lib/egl/libGLESv2_mali.so 
07-10 20:41:33.170: D/(18494): Device driver API match 
07-10 20:41:33.170: D/(18494): Device driver API version: 10 
07-10 20:41:33.170: D/(18494): User space API version: 10 
07-10 20:41:33.170: D/(18494): mali: REVISION=Linux-r2p4-02rel0 BUILD_DATE=Tue Oct 16 15:37:13 KST 2012 
07-10 20:41:33.225: D/OpenGLRenderer(18494): Enabling debug mode 0 
07-10 20:41:34.975: D/GestureDetector(18494): [Surface Touch Event] mSweepDown False, mLRSDCnt : -1 mTouchCnt : 3 mFalseSizeCnt:0 
07-10 20:41:35.110: D/AndroidRuntime(18494): Shutting down VM 
07-10 20:41:35.110: W/dalvikvm(18494): threadid=1: thread exiting with uncaught exception (group=0x40db82a0) 
07-10 20:41:35.115: E/AndroidRuntime(18494): FATAL EXCEPTION: main 
07-10 20:41:35.115: E/AndroidRuntime(18494): java.lang.ClassCastException: java.lang.String cannot be cast to android.bluetooth.BluetoothDevice 
07-10 20:41:35.115: E/AndroidRuntime(18494): at com.test.bluetoothtest.MainActivity$1.onItemClick(MainActivity.java:75) 
07-10 20:41:35.115: E/AndroidRuntime(18494): at android.widget.AdapterView.performItemClick(AdapterView.java:298) 
07-10 20:41:35.115: E/AndroidRuntime(18494): at android.widget.AbsListView.performItemClick(AbsListView.java:1283) 
07-10 20:41:35.115: E/AndroidRuntime(18494): at android.widget.AbsListView$PerformClick.run(AbsListView.java:3074) 
07-10 20:41:35.115: E/AndroidRuntime(18494): at android.widget.AbsListView$1.run(AbsListView.java:4147) 
07-10 20:41:35.115: E/AndroidRuntime(18494): at android.os.Handler.handleCallback(Handler.java:615) 
07-10 20:41:35.115: E/AndroidRuntime(18494): at android.os.Handler.dispatchMessage(Handler.java:92) 
07-10 20:41:35.115: E/AndroidRuntime(18494): at android.os.Looper.loop(Looper.java:137) 
07-10 20:41:35.115: E/AndroidRuntime(18494): at android.app.ActivityThread.main(ActivityThread.java:4898) 
07-10 20:41:35.115: E/AndroidRuntime(18494): at java.lang.reflect.Method.invokeNative(Native Method) 
07-10 20:41:35.115: E/AndroidRuntime(18494): at java.lang.reflect.Method.invoke(Method.java:511) 
07-10 20:41:35.115: E/AndroidRuntime(18494): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1008) 
07-10 20:41:35.115: E/AndroidRuntime(18494): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:775) 
07-10 20:41:35.115: E/AndroidRuntime(18494): at dalvik.system.NativeStart.main(Native Method) 
07-10 20:41:47.780: I/Process(18494): Sending signal. PID: 18494 SIG: 9

来源

2013-07-10 Sensoume

欢迎来到Stackoverflow。我知道你是新人，但要记住，你的一些研究可以帮助你解决问题。你得到的错误是什么？请先显示你的努力，以便其他人可以帮助你。此外，请阅读[FAQ]（http://stackoverflow.com/help）和[如何提问]（http://stackoverflow.com/questions/how-to-ask） – kgdesouz

你的问题是以下行

BluetoothDevice finaldevice = (BluetoothDevice) lv.getAdapter().getItem(arg2);

的getItem返回字符串不是BluetoothDevice类。你的演员失败。

请执行以下操作。

您查询配对的设备并在列表视图中显示它们。从配对的设备，您需要它的Mac地址为了创建连接。在遍历配对设备时，可以提取每个人的地址。稍后在您的点击进行以下操作以获取BluetoothDevice。

Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices(); 
// If there are paired devices 
if (pairedDevices.size() > 0) { 
    // Loop through paired devices 
    for (BluetoothDevice device : pairedDevices) { 
     // Add the name and address to an array adapter to show in a ListView 
     mArrayAdapter.add(device.getName() + "\n" + device.getAddress()); 
    } 
}

稍后从项目的文本中点击一个项目并相应地使用它时提取此地址。

BluetoothDevice device = btAdapter.getRemoteDevice(address);

然后用下面的

btSocket = device.createRfcommSocketToServiceRecord(MY_UUID);

得到的BluetoothSocket然后你就可以使用这个插座进行连接。

btSocket.connect();

来源

2013-07-10 21:01:19 neo

好吧，这是有道理的。但我怎么得到BluetoothDevice那么？ – Sensoume

非常感谢！ – Sensoume

它会很高兴知道你的应用程序崩溃。 LogCat也可以是有帮助的。因为我有自己的UUID我与

Method m = finaldevice.getClass().getMethod("createRfcommSocket", new Class[]{int.class}); 
clientSocket = (Bluetoothsocket) m.invoke(finaldevice, Integer.valueOf(1)); 
clientSocket.connect();

它为我工作的一些问题。

来源

2013-07-10 18:31:42 JackZ

eclipse告诉我把一些catch子句我的应用程序崩溃，如果我点击一个项目在列表视图，意味着在那里公共无效onItemClick函数 – Sensoume

蓝牙连接错误

回答

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