package com.tel.lajoin.wifi.hotspot;
import java.lang.reflect.Method;
import android.app.Activity;
import android.content.Context;
import android.net.wifi.WifiConfiguration;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class HotspotActivity extends Activity {
  private WifiManager wifiManager;
  private Button open;
  private boolean flag=false;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    //获取wifi管理服务
    wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
    open=(Button)findViewById(R.id.open_hotspot);
    //通过按钮事件设置热点
    open.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        //如果是打开状态就关闭，如果是关闭就打开
        flag=!flag;
        setWifiApEnabled(flag);
      }
    });
  }
  // wifi热点开关
  public boolean setWifiApEnabled(boolean enabled) {
    if (enabled) { // disable WiFi in any case
      //wifi和热点不能同时打开，所以打开热点的时候需要关闭wifi
      wifiManager.setWifiEnabled(false);
    }
    try {
      //热点的配置类
      WifiConfiguration apConfig = new WifiConfiguration();
      //配置热点的名称(可以在名字后面加点随机数什么的)
      apConfig.SSID = "YRCCONNECTION";
      //配置热点的密码
      apConfig.preSharedKey="12122112";
        //通过反射调用设置热点
      Method method = wifiManager.getClass().getMethod(
          "setWifiApEnabled", WifiConfiguration.class, Boolean.TYPE);
      //返回热点打开状态
      return (Boolean) method.invoke(wifiManager, apConfig, enabled);
    } catch (Exception e) {
      return false;
    }
  }
}

package com.tel.lajoin.wifiscan; 
import java.util.ArrayList; 
import java.util.List; 
import android.app.Activity; 
import android.content.BroadcastReceiver; 
import android.content.Context; 
import android.content.Intent; 
import android.content.IntentFilter; 
import android.net.wifi.ScanResult; 
import android.net.wifi.WifiConfiguration; 
import android.net.wifi.WifiManager; 
import android.os.Bundle; 
public class MainActivity extends Activity { 
 private List<ScanResult> wifiList; 
 private WifiManager wifiManager; 
 private List<String> passableHotsPot; 
 private WifiReceiver wifiReceiver; 
 private boolean isConnected=false; 
 private Button connect; 
 @Override 
 public void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState); 
  init(); 
 } 
 /* 初始化参数 */ 
 public void init() { 
  setContentView(R.layout.main); 
  connect=(Button)findViewById(R.id.connect); 
  wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE); 
  wifiReceiver = new WifiReceiver(); 
  //通过按钮事件搜索热点 
  connect.setOnClickListener(new View.OnClickListener() { 
   @Override 
   public void onClick(View v) { 
    wifiManager.startScan(); 
   } 
  });  
 } 
 /* 监听热点变化 */ 
 private final class WifiReceiver extends BroadcastReceiver { 
  @Override 
  public void onReceive(Context context, Intent intent) { 
   wifiList = wifiManager.getScanResults(); 
   if (wifiList == null || wifiList.size() == 0 || isConnected) 
    return; 
   onReceiveNewNetworks(wifiList); 
  } 
 } 
 /*当搜索到新的wifi热点时判断该热点是否符合规格*/ 
 public void onReceiveNewNetworks(List<ScanResult> wifiList){ 
  passableHotsPot=new ArrayList<String>(); 
  for(ScanResult result:wifiList){ 
   System.out.println(result.SSID); 
   if((result.SSID).contains("YRCCONNECTION")) 
    passableHotsPot.add(result.SSID); 
  } 
  synchronized (this) { 
   connectToHotpot(); 
  } 
 } 
 /*连接到热点*/ 
 public void connectToHotpot(){ 
  if(passableHotsPot==null || passableHotsPot.size()==0) 
   return; 
  WifiConfiguration wifiConfig=this.setWifiParams(passableHotsPot.get(0)); 
  int wcgID = wifiManager.addNetwork(wifiConfig); 
  boolean flag=wifiManager.enableNetwork(wcgID, true); 
  isConnected=flag; 
  System.out.println("connect success? "+flag); 
 } 
 /*设置要连接的热点的参数*/ 
 public WifiConfiguration setWifiParams(String ssid){ 
  WifiConfiguration apConfig=new WifiConfiguration(); 
  apConfig.SSID="\""+ssid+"\""; 
  apConfig.preSharedKey="\"12122112\""; 
  apConfig.hiddenSSID = true; 
  apConfig.status = WifiConfiguration.Status.ENABLED; 
  apConfig.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP); 
  apConfig.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP); 
  apConfig.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK); 
  apConfig.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP); 
  apConfig.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP); 
  apConfig.allowedProtocols.set(WifiConfiguration.Protocol.RSN); 
  return apConfig; 
 } 
 @Override 
 protected void onDestroy() { 
  super.onDestroy(); 
  /*销毁时注销广播*/ 
  unregisterReceiver(wifiReceiver); 
 } 
}