如何从Android应用程序中的主线程以外的线程开始新的活动？

我正在开发一款可以通过蓝牙播放的安卓游戏。我能够配对设备并完成插座。但那是问题开始的地方。连接建立后，套接字是而不是 null我想在服务器和客户端设备上启动一项活动。我尝试了各种各样的东西，但似乎没有任何工作。我是新来的android编程，真的需要你的帮助。如何从Android应用程序中的主线程以外的线程开始新的活动？

这是我ServerThread.java

class ServerThread extends Thread { 

private final BluetoothServerSocket mmServerSocket; 
BluetoothAdapter mBluetoothAdapter;// = BluetoothAdapter.getDefaultAdapter(); 
final String NAME = "order and chaos"; 
final UUID MY_UUID = UUID.fromString("05c0bd24-c242-11e3-b4b6-b6ee55aeb395"); 
Context context; 
public ServerThread(BluetoothAdapter mBluetoothAdapter,Context context) { 
    // Use a temporary object that is later assigned to mmServerSocket, 
    // because mmServerSocket is final 
    this.context = context; 
    this.mBluetoothAdapter = mBluetoothAdapter; 
    BluetoothServerSocket tmp = null; 
    try { 
     // MY_UUID is the app's UUID string, also used by the client code 
     tmp = mBluetoothAdapter.listenUsingRfcommWithServiceRecord(NAME, MY_UUID); 
    } catch (IOException e) { } 
    mmServerSocket = tmp; 
} 

public void run() { 
    BluetoothSocket socket = null; 
    // Keep listening until exception occurs or a socket is returned 
    while (true) { 
     try { 
      socket = mmServerSocket.accept(); 
     } catch (IOException e) { 
      break; 
     } 
     // If a connection was accepted 
     if (socket != null) { 
      // Do work to manage the connection (in a separate thread) 



     } 
    } 

} 

/** Will cancel the listening socket, and cause the thread to finish */ 
public void cancel() { 
    try { 
     mmServerSocket.close(); 
    } catch (IOException e) { } 
} 
}

这是我ClientThread.java

public class ClientThread extends Thread 
{ 

private final BluetoothSocket mmSocket; 
private final BluetoothDevice mmDevice; 
BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); 
final UUID MY_UUID = UUID.fromString("05c0bd24-c242-11e3-b4b6-b6ee55aeb395"); 
Context context; 
    public ClientThread(BluetoothDevice device,BluetoothAdapter mBluetoothAdapter,Context context) { 
     // Use a temporary object that is later assigned to mmSocket, 
     // because mmSocket is final 
     this.context = context; 
     this.mBluetoothAdapter = mBluetoothAdapter; 
     BluetoothSocket tmp = null; 
     mmDevice = device; 

     // 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) { } 
     mmSocket = tmp; 
    } 

    public void run() { 
     // Cancel discovery because it will slow down the connection 
     mBluetoothAdapter.cancelDiscovery(); 

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

     ConnectedSocket con = new ConnectedSocket(); 
     con.start(1); 
    } 

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

这是ConnectedSocket.java类造成错误

public class ConnectedSocket extends Thread{ 

GameActivity gt = new GameActivity(); 
private Looper myLooper; 
int side; 
public void start(int i) 
{ 
    side = i; 
} 
public void run() 
{ 
    Looper.prepare(); 

    // code that needed a separated thread 
    if(side==0) 
     gt.serverSide(); 
    if(side==1) 
    gt.clientSide(); 

    myLooper = Looper.myLooper(); 
    Looper.loop(); 
    myLooper.quit(); 
}} 

class GameActivity extends Activity{ 

public void serverSide() 
{ 
    Intent i = new Intent(this,SetBoard.class); 
    startActivity(i); 
    Toast toast = Toast.makeText(getApplicationContext(),"You are order", Toast.LENGTH_LONG); 
    toast.setGravity(Gravity.TOP|Gravity.LEFT, 50, 50); 
    toast.show(); 
} 

public void clientSide() 
{ 
    Intent i = new Intent(this, SetBoard.class); 
    startActivity(i); 
    Toast toast = Toast.makeText(getApplicationContext(),"You are chaos", Toast.LENGTH_LONG); 
    toast.setGravity(Gravity.TOP|Gravity.LEFT, 50, 50); 
    toast.show(); 
} 
}

这些都是错误我越来越

04-13 12:39:36.680: E/AndroidRuntime(30346): FATAL EXCEPTION: Thread-12 
04-13 12:39:36.680: E/AndroidRuntime(30346): java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare() 
04-13 12:39:36.680: E/AndroidRuntime(30346): at android.os.Handler.<init>(Handler.java:121) 
04-13 12:39:36.680: E/AndroidRuntime(30346): at android.app.Activity.<init>(Activity.java:686) 
04-13 12:39:36.680: E/AndroidRuntime(30346): at com.chirag.sudoku.GameActivity.<init>(ConnectedSocket.java:34) 
04-13 12:39:36.680: E/AndroidRuntime(30346): at com.chirag.sudoku.ConnectedSocket.<init>(ConnectedSocket.java:11)   
04-13 12:39:36.680: E/AndroidRuntime(30346): at com.chirag.sudoku.ClientThread.run(ClientThread.java:53)  
04-13 12:39:36.740: D/dalvikvm(30346): GC_CONCURRENT freed 217K, 47% free 2971K/5575K, external 3501K/4547K, paused 4ms+3ms   
04-13 12:39:46.790: E/ActivityThread(30346): Activity com.chirag.sudoku.BluetoothMode has leaked IntentReceiver [email protected] that was originally registered here. Are you missing a call to unregisterReceiver()? 
04-13 12:39:46.790: E/ActivityThread(30346): android.app.IntentReceiverLeaked: Activity com.chirag.sudoku.BluetoothMode has leaked IntentReceiver [email protected] that was originally registered here. Are you missing a call to unregisterReceiver()? 
04-13 12:39:46.790: E/ActivityThread(30346): at android.app.LoadedApk$ReceiverDispatcher.<init>(LoadedApk.java:756) 
04-13 12:39:46.790: E/ActivityThread(30346): at android.app.LoadedApk.getReceiverDispatcher(LoadedApk.java:551) 
04-13 12:39:46.790: E/ActivityThread(30346): at android.app.ContextImpl.registerReceiverInternal(ContextImpl.java:871) 
04-13 12:39:46.790: E/ActivityThread(30346): at android.app.ContextImpl.registerReceiver(ContextImpl.java:858) 
04-13 12:39:46.790: E/ActivityThread(30346): at android.app.ContextImpl.registerReceiver(ContextImpl.java:852) 
04-13 12:39:46.790: E/ActivityThread(30346): at android.content.ContextWrapper.registerReceiver(ContextWrapper.java:318) 
04-13 12:39:46.790: E/ActivityThread(30346): at com.chirag.sudoku.BluetoothMode.find(BluetoothMode.java:142) 
04-13 12:39:46.790: E/ActivityThread(30346): at java.lang.reflect.Method.invokeNative(Native Method) 
04-13 12:39:46.790: E/ActivityThread(30346): at java.lang.reflect.Method.invoke(Method.java:507) 
04-13 12:39:46.790: E/ActivityThread(30346): at android.view.View$1.onClick(View.java:2180) 
04-13 12:39:46.790: E/ActivityThread(30346): at android.view.View.performClick(View.java:2585) 
04-13 12:39:46.790: E/ActivityThread(30346): at android.view.View$PerformClick.run(View.java:9299) 
04-13 12:39:46.790: E/ActivityThread(30346): at android.os.Handler.handleCallback(Handler.java:587) 
04-13 12:39:46.790: E/ActivityThread(30346): at android.os.Handler.dispatchMessage(Handler.java:92) 
04-13 12:39:46.790: E/ActivityThread(30346): at android.os.Looper.loop(Looper.java:130) 
04-13 12:39:46.790: E/ActivityThread(30346): at android.app.ActivityThread.main(ActivityThread.java:3770) 
04-13 12:39:46.790: E/ActivityThread(30346): at java.lang.reflect.Method.invokeNative(Native Method) 
04-13 12:39:46.790: E/ActivityThread(30346): at java.lang.reflect.Method.invoke(Method.java:507) 
04-13 12:39:46.790: E/ActivityThread(30346): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:912) 
04-13 12:39:46.790: E/ActivityThread(30346): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:670) 
04-13 12:39:46.790: E/ActivityThread(30346): at dalvik.system.NativeStart.main(Native Method)

请告诉我如何解决它。我甚至试图通过ConnectedSocket类扩展Activity类来直接启动活动。但是，这给出了同样的错误。

来源

2014-04-13 Chirag Agrawal

你似乎是从后台线程或某事调用一些UI方法。 –

感谢您的快速响应。你能告诉我如何解决这个问题吗？我不知道线程 –

你需要'runOnUiThread'来调用后台线程的UI方法 –

这可能工作： -

Handler handler = new Handler(); 
Runnable run= new Runnable() { 

    @Override 
    public void run() { 

      Intent in = new Intent(context, YourActivity.class); 
      in.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
      startActivity(in); 

    } 
}; 
handler.post(run);

来源

2014-04-13 07:31:08 r4jiv007

我用这个替换了我的ConnectedSocket.java代码，它给了我相同的错误。 –

你必须在serverSide（）和clientSide（）方法中使用它 – r4jiv007

谢谢。这工作..我在主线程中添加一个处理程序，从我的服务器和客户端线程开始，并做了诀窍。 –

在你的线程，你把当前类的上下文：

Intent in = new Intent(CurrentActivity.this, YourActivity.class); 
startActivity(in);

，或者你可以也把参数作为参数...

来源

2014-04-13 07:55:50

如何从Android应用程序中的主线程以外的线程开始新的活动？

回答

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