如何修復錯誤打開藍牙？

我創建的應用程序與藍牙，但是藍牙時閉合，APK緊密，烤麪包，我有這個錯誤... java.lang.NullPointerException 在io.webbt.Activity2.openBT如何修復錯誤打開藍牙？

void findBT() 
{ 
    mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); 
    if(mBluetoothAdapter == null) 
    { 
     myLabel.setText("No bluetooth adapter available"); 
    } 

    if(!mBluetoothAdapter.isEnabled()) 
    { 
     Intent enableBluetooth = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE); 
     startActivityForResult(enableBluetooth, REQUEST_ENABLE_BT); 
    }  
}

我有一個消息，如果我想打開藍牙我選擇是的......但沒有繼續我的活動......任何幫助？如果我關閉藍牙，我該如何回到我的活動？

01-16 15:36:08.483: W/dalvikvm(3677): threadid=1: thread exiting with uncaught exception (group=0x2b542210) 
01-16 15:36:08.483: E/AndroidRuntime(3677): FATAL EXCEPTION: main 
01-16 15:36:08.483: E/AndroidRuntime(3677): java.lang.RuntimeException: Unable to start activity ComponentInfo{io.webbt/io.webbt.Activity2}: java.lang.NullPointerException 
01-16 15:36:08.483: E/AndroidRuntime(3677):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1967) 
01-16 15:36:08.483: E/AndroidRuntime(3677):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1992) 
01-16 15:36:08.483: E/AndroidRuntime(3677):  at android.app.ActivityThread.access$600(ActivityThread.java:127) 
01-16 15:36:08.483: E/AndroidRuntime(3677):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1158) 
01-16 15:36:08.483: E/AndroidRuntime(3677):  at android.os.Handler.dispatchMessage(Handler.java:99) 
01-16 15:36:08.483: E/AndroidRuntime(3677):  at android.os.Looper.loop(Looper.java:137) 
01-16 15:36:08.483: E/AndroidRuntime(3677):  at android.app.ActivityThread.main(ActivityThread.java:4441) 
01-16 15:36:08.483: E/AndroidRuntime(3677):  at java.lang.reflect.Method.invokeNative(Native Method) 
01-16 15:36:08.483: E/AndroidRuntime(3677):  at java.lang.reflect.Method.invoke(Method.java:511) 
01-16 15:36:08.483: E/AndroidRuntime(3677):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
01-16 15:36:08.483: E/AndroidRuntime(3677):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
01-16 15:36:08.483: E/AndroidRuntime(3677):  at dalvik.system.NativeStart.main(Native Method) 
01-16 15:36:08.483: E/AndroidRuntime(3677): Caused by: java.lang.NullPointerException 
01-16 15:36:08.483: E/AndroidRuntime(3677):  at io.webbt.Activity2.openBT(Activity2.java:192) 
01-16 15:36:08.483: E/AndroidRuntime(3677):  at io.webbt.Activity2.onStart(Activity2.java:130) 
01-16 15:36:08.483: E/AndroidRuntime(3677):  at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1133) 
01-16 15:36:08.483: E/AndroidRuntime(3677):  at android.app.Activity.performStart(Activity.java:4475) 
01-16 15:36:08.483: E/AndroidRuntime(3677):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1940) 
01-16 15:36:08.483: E/AndroidRuntime(3677):  ... 11 more 

void openBT() throws IOException 
    { 
    UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805f9b34fb"); //Standar  
    mmSocket = mmDevice.createRfcommSocketToServiceRecord(uuid);  
    mmSocket.connect(); 
    mmOutputStream = mmSocket.getOutputStream(); 
    mmInputStream = mmSocket.getInputStream(); 

    myLabel.setText("Bluetooth Opened"); 

    protected void onStart() { 
    super.onStart(); 

    try 
    {   
     //findBT(); 
     openBT();        
    } 
    catch (IOException ex) { } 

    runnable.run();

}

來源

2013-01-16 user1977741

請張貼logcat的輸出 –

沒有ü添加此權限<使用說明 - 權限android：name =「android.permission.BLUETOOTH」/> <使用權限android：name =「android.permission.BLUETOOTH_ADMIN」/> –

權限正常 – user1977741