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目前我正在尝试建立与接入点的连接......我发现q非常好的教程（http://windev-us.net/WXUS_WEB/pdf/LSTArticle.pdf）。我对其进行了一些修改并尝试运行该应用程序，但是当我选择要连接的网络时，我遇到了错误。也许你们中的某个人可以帮助我...

public class WifiActivity extends Activity {

static WifiManager WifiManager;
ArrayAdapter <String> net_array_adapter;
List <ScanResult >Wlan_list;

public static final int WPA = 1;
public static final int WEP = 2;

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    WifiManager = (WifiManager)this.getSystemService(Context.WIFI_SERVICE);

    net_array_adapter = new ArrayAdapter <String> (this, R.layout.device_name);
    ListView lv_net = (ListView)findViewById(R.id.lv_net);
    lv_net.setAdapter(net_array_adapter);
    lv_net.setOnItemClickListener(Net);

    IntentFilter filter = new IntentFilter(android.net.wifi.WifiManager.SCAN_RESULTS_AVAILABLE_ACTION);
    this.registerReceiver(Wifi, filter);

    //Scan
    Button btn_scan = (Button)findViewById(R.id.btn_scan);
    btn_scan.setOnClickListener(new OnClickListener(){
        public void onClick(View v) {
            Discovery();
        }       
    });
}

protected void Discovery() {
    WifiManager.startScan();
}

private OnItemClickListener Net = new OnItemClickListener() {
    public void onItemClick(AdapterView<?> av, View v, int arg2, long arg3) {

        WifiInfo WifiInfo = WifiManager.getConnectionInfo();
        //Name
        String SSID = WifiInfo.getSSID();
        //MAC-Adresse
        String BSSID = WifiInfo.getBSSID();
        //Sichertheit
        int Key = 0; //!!! EDIT: Key= 1 or 2 --> still dont work
        //Passwort
        String PW = "123";

        connectToNetwork(BSSID, Key, PW, SSID);
        finish();
    }
};

private final BroadcastReceiver Wifi = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        net_array_adapter.clear();
        Wlan_list = WifiManager.getScanResults();
        if (WifiManager.isWifiEnabled() == false){
            net_array_adapter.add("WLAN is currently disabled");
        } else {
            for(int i = 0; i < Wlan_list.size(); i++){
                net_array_adapter.add("Name: " + Wlan_list.get(i).SSID + "\nMAC-Adresse: " + Wlan_list.get(i).BSSID);
                if (net_array_adapter.getCount() == 0){
                    net_array_adapter.add("No network avaible");
                }
            }   
        }
    }
};

//Verbindung mit gewählten AP aufbauen
public static boolean connectToNetwork(String sBSSID, int iSecurityType, String sSecurityKey, String sSSID){

    WifiConfiguration tmpConfig;

    List <WifiConfiguration> listConfig = WifiManager.getConfiguredNetworks();

    for (int i = 0; i<listConfig.size(); i++){
        tmpConfig = listConfig.get(i);
        if (tmpConfig.BSSID.equalsIgnoreCase(sBSSID)){
            return WifiManager.enableNetwork(tmpConfig.networkId, true);
        }
    }

    tmpConfig = new WifiConfiguration();
    tmpConfig.BSSID = sBSSID;
    tmpConfig.SSID = sSSID; 
    tmpConfig.priority = 1;

    switch(iSecurityType){
    //WPA
    case WPA:
        tmpConfig.preSharedKey = sSecurityKey;
        break;
    //WEP
    case WEP:
        tmpConfig.wepKeys[0] = sSecurityKey;
        tmpConfig.wepTxKeyIndex = 0;
        break;
    default:
        break;
    }
    tmpConfig.status = WifiConfiguration.Status.ENABLED;

    int netId = WifiManager.addNetwork(tmpConfig);

    return WifiManager.enableNetwork(netId, true);
}

}

这是日志：

04-13 13:29:36.421: E/AndroidRuntime(2496): FATAL EXCEPTION: main
04-13 13:29:36.421: E/AndroidRuntime(2496): java.lang.NullPointerException
04-13 13:29:36.421: E/AndroidRuntime(2496): at wifi.aut.connect.WifiActivity.connectToNetwork(WifiActivity.java:117)
04-13 13:29:36.421: E/AndroidRuntime(2496): at wifi.aut.connect.WifiActivity$1.onItemClick(WifiActivity.java:85)
04-13 13:29:36.421: E/AndroidRuntime(2496): at android.widget.AdapterView.performItemClick(AdapterView.java:284)
04-13 13:29:36.421: E/AndroidRuntime(2496): at android.widget.ListView.performItemClick(ListView.java:3513)
04-13 13:29:36.421: E/AndroidRuntime(2496): at android.widget.AbsListView$PerformClick.run(AbsListView.java:1812)
04-13 13:29:36.421: E/AndroidRuntime(2496): at android.os.Handler.handleCallback(Handler.java:587)
04-13 13:29:36.421: E/AndroidRuntime(2496): at android.os.Handler.dispatchMessage(Handler.java:92)
04-13 13:29:36.421: E/AndroidRuntime(2496): at android.os.Looper.loop(Looper.java:130)
04-13 13:29:36.421: E/AndroidRuntime(2496): at android.app.ActivityThread.main(ActivityThread.java:3683)
04-13 13:29:36.421: E/AndroidRuntime(2496): at java.lang.reflect.Method.invokeNative(Native Method)
04-13 13:29:36.421: E/AndroidRuntime(2496): at java.lang.reflect.Method.invoke(Method.java:507)
04-13 13:29:36.421: E/AndroidRuntime(2496): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
04-13 13:29:36.421: E/AndroidRuntime(2496): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
04-13 13:29:36.421: E/AndroidRuntime(2496): at dalvik.system.NativeStart.main(Native Method)

顺便说一句，我目前正在更改键值手册，但它也不适用于值 1。非常感谢您的所有帖子......安德烈

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1 回答 1

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我想问题出int Key = 0;在onItemClick中。在方法connectToNetwork中的Switch语句中，您只检查WPA和WEP，它们分别为1和2。它会导致default在您的 switch 语句中限定，并将tmpConfig中的某些字段留空。

因此，请将您的密钥设置为0，而应将其设置为1或2并确保您的密码长度符合所选的加密标准

于 2012-04-13T11:49:02.493 回答