Android編程實現wifi掃描及連接的方法

主界面，搜索附近WIFI信息

 

/**

  * Search WIFI and show in ListView

  *

  */

public class MainActivity extends Activity implements OnClickListener,

     OnItemClickListener {

   private Button search_btn;

   private ListView wifi_lv;

   private WifiUtils mUtils;

   private List<String> result;

   private ProgressDialog progressdlg = null ;

   @Override

   protected void onCreate(Bundle savedInstanceState) {

     super .onCreate(savedInstanceState);

     setContentView(R.layout.activity_main);

     mUtils = new WifiUtils( this );

     findViews();

     setLiteners();

   }

   private void findViews() {

     this .search_btn = (Button) findViewById(R.id.search_btn);

     this .wifi_lv = (ListView) findViewById(R.id.wifi_lv);

   }

   private void setLiteners() {

     search_btn.setOnClickListener( this );

     wifi_lv.setOnItemClickListener( this );

   }

   @Override

   public void onClick(View v) {

     if (v.getId() == R.id.search_btn) {

       showDialog();

       new MyAsyncTask().execute();

     }

   }

   /**

    * init dialog and show

    */

   private void showDialog() {

     progressdlg = new ProgressDialog( this );

     progressdlg.setCanceledOnTouchOutside( false );

     progressdlg.setCancelable( false );

     progressdlg.setProgressStyle(ProgressDialog.STYLE_SPINNER);

     progressdlg.setMessage(getString(R.string.wait_moment));

     progressdlg.show();

   }

   /**

    * dismiss dialog

    */

   private void progressDismiss() {

     if (progressdlg != null ) {

       progressdlg.dismiss();

     }

   }

   class MyAsyncTask extends AsyncTask<Void, Void, Void> {

     @Override

     protected Void doInBackground(Void... arg0) {

       //掃描附近WIFI信息

       result = mUtils.getScanWifiResult();

       return null ;

     }

     @Override

     protected void onPostExecute(Void result) {

       super .onPostExecute(result);

       progressDismiss();

       initListViewData();

     }

   }

   private void initListViewData() {

     if ( null != result && result.size() > 0 ) {

       wifi_lv.setAdapter( new ArrayAdapter<String>(

           getApplicationContext(), R.layout.wifi_list_item,

           R.id.ssid, result));

     } else {

       wifi_lv.setEmptyView(findViewById(R.layout.list_empty));

     }

   }

   @Override

   public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {

     TextView tv = (TextView) arg1.findViewById(R.id.ssid);

     if (!TextUtils.isEmpty(tv.getText().toString())) {

       Intent in = new Intent(MainActivity. this , WifiConnectActivity. class );

       in.putExtra( "ssid" , tv.getText().toString());

       startActivity(in);

     }

   }

}

 

 

/**

  * 連接指定的WIFI

  *

  */

public class WifiConnectActivity extends Activity implements OnClickListener {

   private Button connect_btn;

   private TextView wifi_ssid_tv;

   private EditText wifi_pwd_tv;

   private WifiUtils mUtils;

   // wifi之ssid

   private String ssid;

   private String pwd;

   private ProgressDialog progressdlg = null ;

   @SuppressLint ( "HandlerLeak" )

   private Handler mHandler = new Handler() {

     public void handleMessage(android.os.Message msg) {

       switch (msg.what) {

       case 0 :

         showToast( "WIFI連接成功" );

         finish();

         break ;

       case 1 :

         showToast( "WIFI連接失敗" );

         break ;

       }

       progressDismiss();

     }

   };

   @Override

   protected void onCreate(Bundle savedInstanceState) {

     super .onCreate(savedInstanceState);

     setContentView(R.layout.activity_connect);

     mUtils = new WifiUtils( this );

     findViews();

     setLiteners();

     initDatas();

   }

   /**

    * init dialog

    */

   private void progressDialog() {

     progressdlg = new ProgressDialog( this );

     progressdlg.setCanceledOnTouchOutside( false );

     progressdlg.setCancelable( false );

     progressdlg.setProgressStyle(ProgressDialog.STYLE_SPINNER);

     progressdlg.setMessage(getString(R.string.wait_moment));

     progressdlg.show();

   }

   /**

    * dissmiss dialog

    */

   private void progressDismiss() {

     if (progressdlg != null ) {

       progressdlg.dismiss();

     }

   }

   private void initDatas() {

     ssid = getIntent().getStringExtra( "ssid" );

     if (!TextUtils.isEmpty(ssid)) {

       ssid = ssid.replace( "\"" , "" );

     }

     this .wifi_ssid_tv.setText(ssid);

   }

   private void findViews() {

     this .connect_btn = (Button) findViewById(R.id.connect_btn);

     this .wifi_ssid_tv = (TextView) findViewById(R.id.wifi_ssid_tv);

     this .wifi_pwd_tv = (EditText) findViewById(R.id.wifi_pwd_tv);

   }

   private void setLiteners() {

     connect_btn.setOnClickListener( this );

   }

   @Override

   public void onClick(View v) {

     if (v.getId() == R.id.connect_btn) { // 下一步操作

       pwd = wifi_pwd_tv.getText().toString();

       // 判斷密碼輸入情況

       if (TextUtils.isEmpty(pwd)) {

         Toast.makeText( this , "請輸入wifi密碼" , Toast.LENGTH_SHORT).show();

         return ;

       }

       progressDialog();

       // 在子線程中處理各種業務

       dealWithConnect(ssid, pwd);

     }

   }

   private void dealWithConnect( final String ssid, final String pwd) {

     new Thread( new Runnable() {

       @Override

       public void run() {

         Looper.prepare();

         // 檢驗密碼輸入是否正確

         boolean pwdSucess = mUtils.connectWifiTest(ssid, pwd);

         try {

           Thread.sleep( 4000 );

         } catch (Exception e) {

           e.printStackTrace();

         }

         if (pwdSucess) {

           mHandler.sendEmptyMessage( 0 );

         } else {

           mHandler.sendEmptyMessage( 1 );

         }

       }

     }).start();

   }

   private void showToast(String str) {

     Toast.makeText(WifiConnectActivity. this , str, Toast.LENGTH_SHORT).show();

   }

}

 

 

工具類：

public class WifiUtils {

   // 上下文Context對象

   private Context mContext;

   // WifiManager對象

   private WifiManager mWifiManager;

   public WifiUtils(Context mContext) {

     this .mContext = mContext;

     mWifiManager = (WifiManager) mContext

         .getSystemService(Context.WIFI_SERVICE);

   }

   /**

    * 判斷手機是否連接在Wifi上

    */

   public boolean isConnectWifi() {

     // 獲取ConnectivityManager對象

     ConnectivityManager conMgr = (ConnectivityManager) mContext

         .getSystemService(Context.CONNECTIVITY_SERVICE);

     // 獲取NetworkInfo對象

     NetworkInfo info = conMgr.getActiveNetworkInfo();

     // 獲取連接的方式為wifi

     State wifi = conMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI)

         .getState();

     if (info != null && info.isAvailable() && wifi == State.CONNECTED)

     {

       return true ;

     } else {

       return false ;

     }

   }

   /**

    * 獲取當前手機所連接的wifi信息

    */

   public WifiInfo getCurrentWifiInfo() {

     return mWifiManager.getConnectionInfo();

   }

   /**

    * 添加一個網絡並連接 傳入參數：WIFI發生配置類WifiConfiguration

    */

   public boolean addNetwork(WifiConfiguration wcg) {

     int wcgID = mWifiManager.addNetwork(wcg);

     return mWifiManager.enableNetwork(wcgID, true );

   }

   /**

    * 搜索附近的熱點信息，並返回所有熱點為信息的SSID集合數據

    */

   public List<String> getScanWifiResult() {

     // 掃描的熱點數據

     List<ScanResult> resultList;

     // 開始掃描熱點

     mWifiManager.startScan();

     resultList = mWifiManager.getScanResults();

     ArrayList<String> ssids = new ArrayList<String>();

     if (resultList != null ) {

       for (ScanResult scan : resultList) {

         ssids.add(scan.SSID); // 遍歷數據，取得ssid數據集

       }

     }

     return ssids;

   }

   /**

    * 連接wifi 參數：wifi的ssid及wifi的密碼

    */

   public boolean connectWifiTest( final String ssid, final String pwd) {

     boolean isSuccess = false ;

     boolean flag = false ;

     mWifiManager.disconnect();

     boolean addSucess = addNetwork(CreateWifiInfo(ssid, pwd, 3 ));

     if (addSucess) {

       while (!flag && !isSuccess) {

         try {

           Thread.sleep( 10000 );

         } catch (InterruptedException e1) {

           e1.printStackTrace();

         }

         String currSSID = getCurrentWifiInfo().getSSID();

         if (currSSID != null )

           currSSID = currSSID.replace( "\"" , "" );

         int currIp = getCurrentWifiInfo().getIpAddress();

         if (currSSID != null && currSSID.equals(ssid) && currIp != 0 ) {

           isSuccess = true ;

         } else {

           flag = true ;

         }

       }

     }

     return isSuccess;

   }

   /**

    * 創建WifiConfiguration對象 分為三種情況：1沒有密碼;2用wep加密;3用wpa加密

    *

    * @param SSID

    * @param Password

    * @param Type

    * @return

    */

   public WifiConfiguration CreateWifiInfo(String SSID, String Password,

       int Type) {

     WifiConfiguration config = new WifiConfiguration();

     config.allowedAuthAlgorithms.clear();

     config.allowedGroupCiphers.clear();

     config.allowedKeyManagement.clear();

     config.allowedPairwiseCiphers.clear();

     config.allowedProtocols.clear();

     config.SSID = "\"" + SSID + "\"" ;

     WifiConfiguration tempConfig = this .IsExsits(SSID);

     if (tempConfig != null ) {

       mWifiManager.removeNetwork(tempConfig.networkId);

     }

     if (Type == 1 ) // WIFICIPHER_NOPASS

     {

       config.wepKeys[ 0 ] = "" ;

       config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);

       config.wepTxKeyIndex = 0 ;

     }

     if (Type == 2 ) // WIFICIPHER_WEP

     {

       config.hiddenSSID = true ;

       config.wepKeys[ 0 ] = "\"" + Password + "\"" ;

       config.allowedAuthAlgorithms

           .set(WifiConfiguration.AuthAlgorithm.SHARED);

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

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

       config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP40);

       config.allowedGroupCiphers

           .set(WifiConfiguration.GroupCipher.WEP104);

       config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);

       config.wepTxKeyIndex = 0 ;

     }

     if (Type == 3 ) // WIFICIPHER_WPA

     {

       config.preSharedKey = "\"" + Password + "\"" ;

       config.hiddenSSID = true ;

       config.allowedAuthAlgorithms

           .set(WifiConfiguration.AuthAlgorithm.OPEN);

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

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

       config.allowedPairwiseCiphers

           .set(WifiConfiguration.PairwiseCipher.TKIP);

       // config.allowedProtocols.set(WifiConfiguration.Protocol.WPA);

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

       config.allowedPairwiseCiphers

           .set(WifiConfiguration.PairwiseCipher.CCMP);

       config.status = WifiConfiguration.Status.ENABLED;

     }

     return config;

   }

   private WifiConfiguration IsExsits(String SSID) {

     List<WifiConfiguration> existingConfigs = mWifiManager

         .getConfiguredNetworks();

     for (WifiConfiguration existingConfig : existingConfigs) {

       if (existingConfig.SSID.equals( "\"" + SSID + "\"" )) {

         return existingConfig;

       }

     }

     return null ;

   }

}

 

—–相關布局文件————–

主頁面

 

< RelativeLayout xmlns:android = "http://schemas.android.com/apk/res/android"

   xmlns:tools = "http://schemas.android.com/tools"

   android:layout_width = "match_parent"

   android:layout_height = "match_parent" >

   < Button

     android:id = "@+id/search_btn"

     android:layout_width = "match_parent"

     android:layout_height = "wrap_content"

     android:layout_margin = "10dp"

     android:text = "搜索附近WIFI"

     android:textSize = "16sp" >

   </ Button >

   < ListView

     android:id = "@+id/wifi_lv"

     android:layout_width = "match_parent"

     android:layout_height = "wrap_content"

     android:layout_below = "@id/search_btn"

     android:layout_marginTop = "10dp"

     android:divider = "#d1d1d1"

     android:dividerHeight = "1px"

     android:scrollbars = "none" >

   </ ListView >

</ RelativeLayout >

 

連接頁面

 

< RelativeLayout xmlns:android = "http://schemas.android.com/apk/res/android"

   xmlns:tools = "http://schemas.android.com/tools"

   android:layout_width = "match_parent"

   android:layout_height = "match_parent" >

   < TextView

     android:id = "@+id/wifi_ssid"

     android:layout_width = "wrap_content"

     android:layout_height = "wrap_content"

     android:layout_marginTop = "15dp"

     android:padding = "10dp"

     android:text = "@string/wifi_ssid"

     android:textSize = "16sp" />

   < TextView

     android:id = "@+id/wifi_ssid_tv"

     android:layout_width = "wrap_content"

     android:layout_height = "wrap_content"

     android:layout_marginTop = "15dp"

     android:layout_toRightOf = "@id/wifi_ssid"

     android:padding = "10dp"

     android:textSize = "16sp" />

   < TextView

     android:id = "@+id/wifi_pwd"

     android:layout_width = "wrap_content"

     android:layout_height = "wrap_content"

     android:layout_below = "@id/wifi_ssid"

     android:layout_marginTop = "15dp"

     android:padding = "10dp"

     android:text = "@string/wifi_pwd"

     android:textSize = "16sp" />

   < EditText

     android:id = "@+id/wifi_pwd_tv"

     android:layout_width = "match_parent"

     android:layout_height = "wrap_content"

     android:layout_below = "@id/wifi_ssid_tv"

     android:layout_marginRight = "15dp"

     android:layout_marginTop = "15dp"

     android:layout_toRightOf = "@id/wifi_pwd"

     android:hint = "@string/input_pwd_hint"

     android:padding = "10dp"

     android:textSize = "16sp" />

   < Button

     android:id = "@+id/connect_btn"

     android:layout_width = "match_parent"

     android:layout_height = "wrap_content"

     android:layout_alignParentBottom = "true"

     android:layout_margin = "10dp"

     android:text = "連接WIFI"

     android:textSize = "16sp" >

   </ Button >

</ RelativeLayout >

 

主頁面ListView的item

< RelativeLayout xmlns:android = "http://schemas.android.com/apk/res/android"

   xmlns:tools = "http://schemas.android.com/tools"

   android:layout_width = "match_parent"

   android:layout_height = "40dp"

   android:background = "#FFFFFF" >

   < TextView

     android:id = "@+id/ssid"

     android:layout_width = "wrap_content"

     android:layout_height = "wrap_content"

     android:layout_alignParentLeft = "true"

     android:layout_centerInParent = "true"

     android:paddingLeft = "15dp"

     android:textColor = "#333333"

     android:textSize = "16sp" />

</ RelativeLayout >

 

主界面未搜索 到WIFI的展示

< RelativeLayout xmlns:android = "http://schemas.android.com/apk/res/android"

   xmlns:tools = "http://schemas.android.com/tools"

   android:layout_width = "match_parent"

   android:layout_height = "match_parent"

   android:background = "#FFFFFF" >

   < TextView

     android:id = "@+id/ssid"

     android:layout_width = "wrap_content"

     android:layout_height = "wrap_content"

     android:layout_centerInParent = "true"

     android:text = "附近暫時沒有WIFI"

     android:textColor = "#333333"

     android:textSize = "16sp" />

</ RelativeLayout >

 

github上DEMO下載地址： https://github.com/ldm520/WIFI_TOOL

 

https://www.jb51.net/article/135069.htm