Java - 如果它已经存在，如何连接到无线网络？

Question

我使用下面的代码在android手机上创建无线配置文件。由于某种原因，它每次都会创建一个新配置文件，因此电话将为同一无线网络配置多个配置文件。有没有办法让它不创建一个新的配置文件，如果它已经存在？

import android.app.Activity; 
import android.os.Bundle; 
import android.content.Context; 
import android.net.ConnectivityManager; 
import android.net.NetworkInfo; 
import android.net.wifi.WifiConfiguration; 
import android.net.wifi.WifiManager; 
import android.util.Log; 
import android.widget.TextView; 

public class IVMOBILEActivity extends Activity { 
/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) {  
    super.onCreate(savedInstanceState); 
    TextView tv = new TextView(this);  
    TextView status = new TextView(this);     


    WifiManager wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE); 
    WifiConfiguration wc = new WifiConfiguration(); 
    wc.SSID = "\"MyNetwork\""; //IMP! This should be in Quotes!! 

    wc.hiddenSSID = true; 
    wc.status = WifiConfiguration.Status.ENABLED;  
    wc.priority = 10; 
    wc.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK); 
    wc.allowedProtocols.set(WifiConfiguration.Protocol.RSN); 
    wc.allowedProtocols.set(WifiConfiguration.Protocol.WPA); 
    wc.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN); 
    wc.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.SHARED); 
    wc.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP); 
    wc.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP); 
    wc.preSharedKey = "\"Password\""; 
    WifiManager wifiManag = (WifiManager) this.getSystemService(WIFI_SERVICE); 
    boolean res1 = wifiManag.setWifiEnabled(true); 
    int res = wifi.addNetwork(wc); 
    Log.d("WifiPreference", "add Network returned " + res); 
    boolean es = wifi.saveConfiguration(); 
    Log.d("WifiPreference", "saveConfiguration returned " + es); 
    boolean b = wifi.enableNetwork(res, true);  
    Log.d("WifiPreference", "enableNetwork returned " + b); 

    tv.setText("You are now connected! " + 
      "Version 1.0"); 

    status.setText("The was an error connecting, please try again."); 

    try { 

     Thread.sleep(5000); 

     ConnectivityManager connec = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE); 

     if (connec != null && (connec.getNetworkInfo(1).getState() == NetworkInfo.State.CONNECTED) ||(connec.getNetworkInfo(0).getState() == NetworkInfo.State.CONNECTED)){ 
       //You are connected, do something online. 
       setContentView(tv); 

      }else if (connec.getNetworkInfo(0).getState() == NetworkInfo.State.DISCONNECTED || connec.getNetworkInfo(1).getState() == NetworkInfo.State.DISCONNECTED) {    
       //Not connected.   
       setContentView(status); 
      } 

    } catch (InterruptedException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } 






} 


} 

Answer 1

在将其添加到WifiManager之前，请先检查它是否存在。伪代码例如：

//Check if this SSID is already stored. If it is, return that configuration. 
//If not, return the configuration being tested. 
public WifiConfiguration checkPreviousConfiguration(WifiConfiguration wc) { 
    List<WifiConfiguration configs = wifi.getConfigurations(); 
    for(WifiConfiguration config : configs) { 
     if(config.SSID.equals(wc.SSID)) return config; 
    } 
    return wc; 
} 

//...... 
int res = wifi.addNetwork(checkPreviousConfiguration(wc)); 

有意义吗？

编辑：很明显，你可能会想核对等因素的影响并不仅止于SSID（因为一个SSID并不一定是唯一的标识符），并对照之前建设一个新WifiConfiguration实例的，但是这是一种我会从头开始的想法。