isReachable在android工作室不工作

-1

我使用XBMC android源代碼，現在嘗試提取一些代碼到新的xbmc android項目。當我嘗試連接到一個IP地址，並檢查它是否可以使用isReachable（），它是拋出一個NetworkOnMainThreadException但相同的源代碼（在XBMC源代碼，我從git downloded）它工作正常，這是源代碼我工作isReachable在android工作室不工作

Handler handler = new Handler(){ 
      public void handleMessage(android.os.Message message){ 
       if(message.getData().containsKey(MacAddressResolver.MESSAGE_MAC_ADDRESS)){ 
        String mac = message.getData().getString(MacAddressResolver.MESSAGE_MAC_ADDRESS); 
        if(!mac.equals("")) { 
         mMacAddrView.setText(mac); 
         Toast toast = Toast.makeText(getContext(), "Updated MAC for host: " + mHostView.getText().toString() + "\nto: " + mac, Toast.LENGTH_SHORT); 
         toast.show(); 
        } 
       } 
      } 
     }; 


public class MacAddressResolver implements Runnable{ 

private String mHost = null; 
private String mMac = null; 
private Handler mHandler; 

public static final String MESSAGE_MAC_ADDRESS = "MAC_ADDRESS"; 

public MacAddressResolver(String ipString, Handler handler){ 
    mHost = ipString; 
    mHandler = handler; 
} 

public void run(){ 
    mMac = arpResolve(mHost); 
    Bundle bundle = new Bundle(); 
    bundle.putString(MESSAGE_MAC_ADDRESS, mMac); 
    Message message = new Message(); 
    message.setData(bundle); 
    mHandler.sendMessage(message); 
} 

private String arpResolve(String host){ 
    System.out.println("ARPRESOLVE HOST: " + host); 
    try{ 
     //Parse it as a proper InetAddress - it might be a hostname. We don't know yet. 
     InetAddress inet = InetAddress.getByName(host); 

     //initiate some sort of traffic to ensure we get an arp entry (if we're on same subnet, that is...) 
     inet.isReachable(500); //timeout of 500ms. just to trigger the arp resolution process 

     //Get the official string representation of the resolved ip address 
     String ipString = inet.getHostAddress(); 
     BufferedReader br = new BufferedReader(new FileReader("/proc/net/arp")); 
     String line = ""; 
     while(true){ 
      line = br.readLine(); 
      if (line == null) 
       break; 
      if(line.startsWith(ipString)){ 
       br.close(); 
       System.out.println("ARPRESOLVE MAC:\n" + line); 
       return line.split("\\s+")[3]; // 4th word, separated by "whitespace" 
      } 
     } 
     br.close(); 
     return ""; 

    }catch(Exception e){ 

     return ""; 
    } 

}

}

，我也把這兩個權限在我的AndroidManifest.xml文件

<uses-sdk 
    android:minSdkVersion="8" 
    android:targetSdkVersion="13" /> 

<uses-permission android:name="android.permission.INTERNET" /> 
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

我不知道，是什麼問題我該如何解決它？

來源

2015-05-26 Nuwan Indika

NetworkOnMainThreadException exception意味着你正在做的一些MainThreadNetworking Work（這將重載Thread並拋出一個Exception）。

因此，您必須將Networking Code移動到Background Thread（另一個thread，然後是Main Thread）。

AsyncTask 是一個很好的例子來處理這種事

來源

2015-05-26 05:56:55 hrskrs

isReachable在android工作室不工作

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