android wifi操作(扫描和连接)

android系列wifi操作，首先应该添加如下权限：

<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" >      </uses-permission>      <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" >      </uses-permission>      <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" >      </uses-permission>      <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" >      </uses-permission>

package com.example.androidwifi;    import java.io.Serializable;  import java.util.ArrayList;  import java.util.HashMap;  import java.util.List;  import java.util.Map;    import android.app.IntentService;  import android.app.ProgressDialog;  import android.content.BroadcastReceiver;  import android.content.Context;  import android.content.Intent;  import android.content.IntentFilter;  import android.net.ConnectivityManager;  import android.net.NetworkInfo;  import android.net.wifi.ScanResult;  import android.net.wifi.WifiConfiguration;  import android.net.wifi.WifiInfo;  import android.net.wifi.WifiManager;  import android.os.Bundle;  import android.util.Log;  import android.widget.Toast;    public class WifiService extends IntentService {     private static final String DEBUG = "debug";   private static List<ScanResult>resultList = new ArrayList<ScanResult>();   private List<WifiConfiguration>wificonfigList = new ArrayList<WifiConfiguration>();   private NetworkInfo mnetWorkInfo;   private WifiInfo mWifiInfo;   private WifiManager mwifiManager;//管理wifi     public  List<Map<String,String>>mlist = new ArrayList<Map<String,String>>();     @Override   public void onCreate() {    // TODO Auto-generated method stub    super.onCreate();    //获得系统wifi服务    mwifiManager = (WifiManager) getSystemService(WIFI_SERVICE);    registerReceiver(wifiReceiver, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));   }     @Override   protected void onHandleIntent(Intent intent) {    int status = intent.getExtras().getInt("status");    switch (status) {    case 0://open wifi && search wifi     Log.d(DEBUG, "打开service wifi");     if (!mwifiManager.isWifiEnabled()) {      mwifiManager.setWifiEnabled(true);      resultList.clear();      mwifiManager.startScan();//开始搜索，当搜索到可用的wifi时，将发送WifiManager.SCAN_RESULTS_AVAILABLE_ACTION的广播            while (mlist.size() == 0) {//此处休眠0.1秒是因为搜索wifi是一个耗时的操作，如果不休眠，则扫描结果可能为空       try {        Thread.sleep(100);       } catch (InterruptedException e) {        // TODO Auto-generated catch block        e.printStackTrace();       }      }      Intent broadCastIntent = new Intent();  //    Bundle bundle = new Bundle();      broadCastIntent.putExtra("result",(Serializable) mlist);        broadCastIntent.setAction("com.androidwifi.opensuccess");      sendBroadcast(broadCastIntent);       }     break;    case 1://close wifi     Log.d(DEBUG, "关闭service wifi");     if (mwifiManager.isWifiEnabled()) {      mwifiManager.setWifiEnabled(false);     }     break;    case 2:     int result = -1;//表示链接失败     Intent resultIntent = new Intent();      resultIntent.setAction("com.androidwifi.result");          String  ssid= intent.getStringExtra("ssid");     String pass = intent.getStringExtra("pass");          resultIntent.putExtra("ssid",ssid);     int netWorkId = AddWifiConfig(resultList, ssid, pass);//添加该网络的配置     if (netWorkId !=-1) {      getConfigurations();      boolean isConnect = ConnectWifi(netWorkId);      if (isConnect) {       result = 1;      }     }     resultIntent.putExtra("result",result);     sendBroadcast(resultIntent);     break;         default:     break;    }     }     /**    * 当搜索到可用wifi时，将结果封装到mlist中    */   private final BroadcastReceiver wifiReceiver = new BroadcastReceiver() {      @Override    public void onReceive(Context arg0, Intent intent) {     // TODO Auto-generated method stub     if (intent.getAction().equals(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)) {      resultList = mwifiManager.getScanResults();      sortByLevel(resultList);      for (ScanResult scanResult : resultList) {       Map<String,String>map = new HashMap<String, String>();       map.put("wifi_name",scanResult.SSID);       map.put("wifi_bssid",scanResult.BSSID);       mlist.add(map);      }     }      }   };     /**    * 得到配置信息    */   public void getConfigurations() {    wificonfigList = mwifiManager.getConfiguredNetworks();   }      /**    * 该链接是否已经配置过    * @param SSID    * @return    */   public int isConfigured(String SSID) {    for (int i = 0; i < wificonfigList.size(); i++) {     if (wificonfigList.get(i).SSID.equals(SSID)) {      return wificonfigList.get(i).networkId;     }    }    return -1;   }   /**    * 链接到制定wifi    * @param wifiId    * @return    */   public boolean ConnectWifi(int wifiId){    boolean isConnect = false;    int id= 0;    for(int i = 0; i < wificonfigList.size(); i++){     WifiConfiguration wifi = wificonfigList.get(i);     id = wifi.networkId;     if(id == wifiId){      while(!(mwifiManager.enableNetwork(wifiId, true))){       Log.i("ConnectWifi",String.valueOf(wificonfigList.get(wifiId).status));      }        if ( mwifiManager.enableNetwork(wifiId, true)) {       isConnect = true;      }     }    }    return isConnect;   }      /**    * 添加wifi配置    * @param wifiList    * @param ssid    * @param pwd    * @return    */   public int AddWifiConfig(List<ScanResult> wifiList,String ssid,String pwd){    int wifiId = -1;    for(int i = 0;i < wifiList.size(); i++){     ScanResult wifi = wifiList.get(i);     if(wifi.SSID.equals(ssid)){      Log.i("AddWifiConfig","equals");      WifiConfiguration wifiCong = new WifiConfiguration();      wifiCong.SSID = "\""+wifi.SSID+"\"";      wifiCong.preSharedKey = "\""+pwd+"\"";      wifiCong.hiddenSSID = false;      wifiCong.status = WifiConfiguration.Status.ENABLED;      wifiId = mwifiManager.addNetwork(wifiCong);      if(wifiId != -1){       return wifiId;      }     }    }    return wifiId;   }      //将搜索到的wifi根据信号强度从强到弱进行排序   private void sortByLevel(List<ScanResult> resultList) {    for(int i=0;i<resultList.size();i++)     for(int j=1;j<resultList.size();j++)     {      if(resultList.get(i).level<resultList.get(j).level)    //level属性即为强度      {       ScanResult temp = null;       temp = resultList.get(i);       resultList.set(i, resultList.get(j));       resultList.set(j, temp);      }     }   }     @Override   public void onDestroy() {    // TODO Auto-generated method stub       unregisterReceiver(wifiReceiver);    super.onDestroy();   }      public WifiService() {    super("");    // TODO Auto-generated constructor stub   }    }

package com.example.androidwifi;    import java.util.List;  import java.util.Map;    import android.app.Activity;  import android.app.AlertDialog;  import android.app.ProgressDialog;  import android.content.BroadcastReceiver;  import android.content.Context;  import android.content.Intent;  import android.os.Bundle;  import android.view.LayoutInflater;  import android.view.Menu;  import android.view.MenuItem;  import android.view.View;  import android.view.View.OnClickListener;  import android.widget.AdapterView;  import android.widget.AdapterView.OnItemClickListener;  import android.widget.Button;  import android.widget.EditText;  import android.widget.LinearLayout;  import android.widget.ListView;  import android.widget.SimpleAdapter;  import android.widget.Toast;    public class MainActivity extends Activity {     private Button msearchBtn;   private Button mopenBtn;   private Button mcloseBtn;   private static  ListView msearchList;   private static ProgressDialog dialog;   private static LinearLayout openView;   static List<Map<String,String>>mlist;     @Override   protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    msearchList = (ListView) findViewById(R.id.resultlist);    msearchList.setOnItemClickListener(new OnItemClickListener() {       @Override     public void onItemClick(AdapterView<?> adapter, View view, int position,       long arg3) {      // TODO Auto-generated method stub      WifiService service = new WifiService();        Map<String,String>map = mlist.get(position);//得到对应的list中的map      final String ssid = map.get("wifi_name");//得到点击的热点的ssid，即wifi名称      int wifiItemId = service.isConfigured("\""+ssid+"\"");//判断是否已经存储该热点的信息,返回bssid      if (service.ConnectWifi(wifiItemId)) {       view.setBackgroundResource(R.color.green);      }else{//弹出对话框，输入密码         View inflater = LayoutInflater.from(MainActivity.this).inflate(R.layout.ensure_conn,null);       final AlertDialog alertDialog =new  AlertDialog.Builder(MainActivity.this).setTitle("请输入密码").setView(inflater).create();       alertDialog.show();       final EditText passEdit = (EditText) inflater.findViewById(R.id.pass);       Button connBtn = (Button) inflater.findViewById(R.id.conn);       connBtn.setOnClickListener(new OnClickListener() {          @Override        public void onClick(View arg0) {         // TODO Auto-generated method stub         String pass = passEdit.getText().toString();         if (null == pass || "".equals(pass)) {          Toast.makeText(MainActivity.this,"请输入密码",1000).show();          return;         }         Intent connectIntent = new Intent(MainActivity.this,WifiService.class);         Bundle bundle = new Bundle();         bundle.putInt("status",2);         connectIntent.putExtras(bundle);         connectIntent.putExtra("ssid",ssid);         connectIntent.putExtra("pass",pass);         startService(connectIntent);         alertDialog.dismiss();         dialog =ProgressDialog.show(MainActivity.this,"","正在链接"+ssid);          }       });      }     }    });   }       @Override   public boolean onCreateOptionsMenu(Menu menu) {    // TODO Auto-generated method stub    getMenuInflater().inflate(R.menu.main, menu);    return true;   }         @Override   public boolean onOptionsItemSelected(MenuItem item) {    @SuppressWarnings("unused")    LayoutInflater inflater = LayoutInflater.from(this);    switch (item.getItemId()) {    case R.id.open_wifi://open wifi && search wifi     Intent openWifiIntent = new Intent(MainActivity.this,WifiService.class);     Bundle openBundle = new Bundle();     openBundle.putInt("status",0);     openWifiIntent.putExtras(openBundle);     startService(openWifiIntent);       dialog = ProgressDialog.show(this,"正在打开wifi","正在搜索wifi...");       break;    case R.id.close_wifi://close wifi       Intent closeWifiIntent = new Intent(MainActivity.this,WifiService.class);     Bundle closeBundle = new Bundle();     closeBundle.putInt("status",1);     closeWifiIntent.putExtras(closeBundle);     startService(closeWifiIntent);     break;    default:     break;    }      return super.onOptionsItemSelected(item);   }     public static class WifiReceiver extends BroadcastReceiver {      @Override    public void onReceive(Context context, Intent intent) {     if (intent.getAction().equals("com.androidwifi.opensuccess")) {      @SuppressWarnings("unchecked")      List<Map<String, String>>list = (List<Map<String, String>>) intent.getSerializableExtra("result");      mlist = list;      dialog.dismiss();      //    ArrayAdapter<String>adapter = new ArrayAdapter<String>(context,android.R.layout.simple_list_item_1,scanResult);      SimpleAdapter adapter = new SimpleAdapter(context, mlist, R.layout.searchlist_item,new String[]{"wifi_name","wifi_bssid"},new int[]{R.id.wifi_name,R.id.wifi_bssid});        msearchList.setAdapter(adapter);       }      }     }     public static class WifiResultReceiver extends BroadcastReceiver {    @Override    public void onReceive(Context context, Intent intent) {     if (dialog.isShowing()) {      dialog.dismiss();     }     // TODO Auto-generated method stub     if (intent.getAction().equals("com.androidwifi.result")) {      int result = intent.getIntExtra("result",0);      String ssid = intent.getStringExtra("ssid");      if (result == -1) {       Toast.makeText(context,"链接"+ssid+"失败",1000).show();      }      if (result == 1) {       Toast.makeText(context,"已链接到"+ssid,1000).show();      }     }    }   }    }

来自： http://blog.csdn.net//mockingbirds/article/details/40680389