Android开发入门——WIFI网络操作

2、 要对wifi进行操作，首先要在AndroidMenifest.xml中取得权限的，如下：

<!-- 以下是使用wifi访问网络所需要的权限-->

<uses-permissionandroid:name="android.permission.CHANGE_NETWORK_STATE">

</uses-permission>  //修改网络状态的权限

<uses-permissionandroid:name="android.permission.CHANGE_WIFI_STATE">

</uses-permission>  //修改wifi状态的权限

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

</uses-permission>  //访问网络权限

<uses-permissionandroid:name="android.permission.ACCESS_WIFI_STATE">

</uses-permission>   //访问wifi权限



3、  对wifi网卡进行操作需要通过WifiManger对象来进行，获取该对象的方法如下：

WifiManger wifiManger =

（WifiManger）Context.getSystemService(Service.WIFI_SERVICE);


  打开wifi网卡

        Wifimanger.setWifiEnabled(true);

关闭wifi网卡

        wifiManger.setWifiEnablee(false);

获取网卡的当前的状态

       wifiManger.getWifiState();




import android.app.Activity;
import android.content.Context;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class WifiActivity extends Activity {
    /** Called when the activity is first created. */
private Button startButton = null;
private Button stopButton = null;
private Button checkButton = null;
private WifiManager wifiManager = null;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        startButton = (Button)findViewById(R.id.startWifi);
        stopButton = (Button)findViewById(R.id.stopWifi);
        checkButton = (Button)findViewById(R.id.checkWifi);
        startButton.setOnClickListener(new StartWifiListener());
        stopButton.setOnClickListener(new StopWifiListener());
        checkButton.setOnClickListener(new CheckWifiListener());
    }
    class StartWifiListener implements OnClickListener{

  @Override
  public void onClick(View v) {
   wifiManager = (WifiManager)WifiActivity.this.getSystemService(Context.WIFI_SERVICE);
   wifiManager.setWifiEnabled(true);
   System.out.println("wifi state --->" + wifiManager.getWifiState());
   Toast.makeText(WifiActivity.this, "当前Wifi网卡状态为" +
wifiManager.getWifiState(), Toast.LENGTH_SHORT).show();
  }
    }
    class StopWifiListener implements OnClickListener{

  @Override
  public void onClick(View arg0) {
   // TODO Auto-generated method stub
   wifiManager = (WifiManager)WifiActivity.this.getSystemService(Context.WIFI_SERVICE);
   wifiManager.setWifiEnabled(false);
   System.out.println("wifi state --->" + wifiManager.getWifiState());
   Toast.makeText(WifiActivity.this, "当前Wifi网卡状态为" +
wifiManager.getWifiState(), Toast.LENGTH_SHORT).show();
  }
   
    }
   
    class CheckWifiListener implements OnClickListener{

  @Override
  public void onClick(View v) {
   wifiManager = (WifiManager)WifiActivity.this.getSystemService(Context.WIFI_SERVICE);
   System.out.println("wifi state --->" + wifiManager.getWifiState());
   Toast.makeText(WifiActivity.this, "当前Wifi网卡状态为" +
wifiManager.getWifiState(), Toast.LENGTH_SHORT).show();
  }
    
    }
}





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

　　WifiConfiguration wc = new WifiConfiguration();

　　// This is must be quoted according to the documentation

　　// http://developer.android.com/reference/android/net/wifi/WifiConfiguration.html#SSID

　　wc.SSID = "\"SSIDName\"";

　　wc.preSharedKey = "password";

　　wc.hiddenSSID = true;

　　wc.status = WifiConfiguration.Status.ENABLED;

　　wc.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);

　　wc.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);

　　wc.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK);

　　wc.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP);

　　wc.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP);

　　wc.allowedProtocols.set(WifiConfiguration.Protocol.RSN);

　　int res = wifi.addNetwork(wc);

　　Log.d("WifiPreference", "add Network returned " + res );

　　boolean b = wifi.enableNetwork(res, true);

　　Log.d("WifiPreference", "enableNetwork returned " + b );