Android WiFi开发

概述

介绍Android WiFi的扫描、连接、信息、以及WiFi热点等等的实现，并用代码实现。

详细

代码下载：http://www.demodashi.com/demo/10660.html

一、准备工作

开发环境：

jdk1.8

Eclipse Luna Service Release 1 (4.4.1)

运行环境：

华为荣耀6（Android4.4）、华为p9（Android7.0）

实现功能：

• Android WiFi开发 （一）扫描、连接、信息

• Android WiFi开发 （二）Wifi热点

二、代码结构

代码包里面，有两个部分，一个是源码，一个是V7支持包。

（源码项目）

（V7包）

三、Android WiFi开发 （一）扫描、连接、信息

1、详细讲解

在平常开发中经常会涉及到wifi相关的内容，在此将之前所用到的整理一下，以免忘记。

操作wifi的相关类，主要放在Android.net.wifi包下面。使用wifi相关方法需要申请一些权限：

ACCESS_WIFI_STATE 获取WiFi状态。

CHANGE_WIFI_STATE 改变WiFi状态。

CHANGE_WIFI_MULTICAST_STATE 改变WiFi多播状态

申请权限方式：在AndroidManifest.xml文件中填写

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

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

wifi相关操作所需要用到的类。

先说一下wifi的基本使用情况。

import java.util.List;
import android.content.Context;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiConfiguration;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.net.wifi.WifiManager.WifiLock;
import android.widget.Toast;  

public class WifiAdmin {
    // 定义WifiManager对象
    private WifiManager mWifiManager;
    // 定义WifiInfo对象
    private WifiInfo mWifiInfo;
    // 扫描出的网络连接列表
    private List<ScanResult> mWifiList;
    // 网络连接列表
    private List<WifiConfiguration> mWifiConfiguration;
    // 定义一个WifiLock
    WifiLock mWifiLock;  

    // 构造器
    public WifiAdmin(Context context) {
        // 取得WifiManager对象
        mWifiManager = (WifiManager) context
                .getSystemService(Context.WIFI_SERVICE);
        // 取得WifiInfo对象
        mWifiInfo = mWifiManager.getConnectionInfo();
    }    

    // 打开WIFI
    public void openWifi(Context context) {
        if (!mWifiManager.isWifiEnabled()) {
            mWifiManager.setWifiEnabled(true);
        }else if (mWifiManager.getWifiState() == 2) {
            Toast.makeText(context,"亲，Wifi正在开启，不用再开了", Toast.LENGTH_SHORT).show();
        }else{
            Toast.makeText(context,"亲，Wifi已经开启,不用再开了", Toast.LENGTH_SHORT).show();
        }
    }    

    // 关闭WIFI
    public void closeWifi(Context context) {
        if (mWifiManager.isWifiEnabled()) {
            mWifiManager.setWifiEnabled(false);
        }else if(mWifiManager.getWifiState() == 1){
            Toast.makeText(context,"亲，Wifi已经关闭，不用再关了", Toast.LENGTH_SHORT).show();
        }else if (mWifiManager.getWifiState() == 0) {
            Toast.makeText(context,"亲，Wifi正在关闭，不用再关了", Toast.LENGTH_SHORT).show();
        }else{
            Toast.makeText(context,"请重新关闭", Toast.LENGTH_SHORT).show();
        }
    }    

    // 检查当前WIFI状态
    public void checkState(Context context) {
        if (mWifiManager.getWifiState() == 0) {
            Toast.makeText(context,"Wifi正在关闭", Toast.LENGTH_SHORT).show();
        } else if (mWifiManager.getWifiState() == 1) {
            Toast.makeText(context,"Wifi已经关闭", Toast.LENGTH_SHORT).show();
        } else if (mWifiManager.getWifiState() == 2) {
            Toast.makeText(context,"Wifi正在开启", Toast.LENGTH_SHORT).show();
        } else if (mWifiManager.getWifiState() == 3) {
            Toast.makeText(context,"Wifi已经开启", Toast.LENGTH_SHORT).show();
        } else {
            Toast.makeText(context,"没有获取到WiFi状态", Toast.LENGTH_SHORT).show();
        }
    }    

    // 锁定WifiLock
    public void acquireWifiLock() {
        mWifiLock.acquire();
    }    

    // 解锁WifiLock
    public void releaseWifiLock() {
        // 判断时候锁定
        if (mWifiLock.isHeld()) {
            mWifiLock.acquire();
        }
    }    

    // 创建一个WifiLock
    public void creatWifiLock() {
        mWifiLock = mWifiManager.createWifiLock("Test");
    }    

    // 得到配置好的网络
    public List<WifiConfiguration> getConfiguration() {
        return mWifiConfiguration;
    }    

    // 指定配置好的网络进行连接
    public void connectConfiguration(int index) {
        // 索引大于配置好的网络索引返回
        if (index > mWifiConfiguration.size()) {
            return;
        }
        // 连接配置好的指定ID的网络
        mWifiManager.enableNetwork(mWifiConfiguration.get(index).networkId,
                true);
    }    

    public void startScan(Context context) {
        mWifiManager.startScan();
        // 得到扫描结果
        mWifiList = mWifiManager.getScanResults();
        // 得到配置好的网络连接
        mWifiConfiguration = mWifiManager.getConfiguredNetworks();
        if (mWifiList == null) {
            if(mWifiManager.getWifiState()==3){
                Toast.makeText(context,"当前区域没有无线网络", Toast.LENGTH_SHORT).show();
            }else if(mWifiManager.getWifiState()==2){
                Toast.makeText(context,"WiFi正在开启，请稍后重新点击扫描", Toast.LENGTH_SHORT).show();
            }else{
                Toast.makeText(context,"WiFi没有开启，无法扫描", Toast.LENGTH_SHORT).show();
            }
        }
    }    

    // 得到网络列表
    public List<ScanResult> getWifiList() {
        return mWifiList;
    }    

    // 查看扫描结果
    public StringBuilder lookUpScan() {
        StringBuilder stringBuilder = new StringBuilder();
        for (int i = 0; i < mWifiList.size(); i++) {
            stringBuilder
                    .append("Index_" + new Integer(i + 1).toString() + ":");
            // 将ScanResult信息转换成一个字符串包
            // 其中把包括：BSSID、SSID、capabilities、frequency、level
            stringBuilder.append((mWifiList.get(i)).toString());
            stringBuilder.append("/n");
        }
        return stringBuilder;
    }   

    // 得到MAC地址
    public String getMacAddress() {
        return (mWifiInfo == null) ? "NULL" : mWifiInfo.getMacAddress();
    }    

    // 得到接入点的BSSID
    public String getBSSID() {
        return (mWifiInfo == null) ? "NULL" : mWifiInfo.getBSSID();
    }    

    // 得到IP地址
    public int getIPAddress() {
        return (mWifiInfo == null) ? 0 : mWifiInfo.getIpAddress();
    }    

    // 得到连接的ID
    public int getNetworkId() {
        return (mWifiInfo == null) ? 0 : mWifiInfo.getNetworkId();
    }    

    // 得到WifiInfo的所有信息包
    public String getWifiInfo() {
        return (mWifiInfo == null) ? "NULL" : mWifiInfo.toString();
    }    

    // 添加一个网络并连接
    public void addNetwork(WifiConfiguration wcg) {
     int wcgID = mWifiManager.addNetwork(wcg);
     boolean b =  mWifiManager.enableNetwork(wcgID, true);
     System.out.println("a--" + wcgID);
     System.out.println("b--" + b);
    }    

    // 断开指定ID的网络
    public void disconnectWifi(int netId) {
        mWifiManager.disableNetwork(netId);
        mWifiManager.disconnect();
    }
    public void removeWifi(int netId) {
        disconnectWifi(netId);
        mWifiManager.removeNetwork(netId);
    }  

//然后是一个实际应用方法，只验证过没有密码的情况：   

    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;
    }
}

如图所示：

俩bug

这些代码看起来没有什么问题，但是通过不同环境的测试，发现了一些问题。

1 测试到的wifi热点，有的ssid为”“，也就是ssid ！＝ null,获取不到said。

2 wifi列表中有许多同名的wifi热点，也就是扫描的结果中有重合部分，并不是有多个同名的wifi热点。

第一个问题ssid为“”，这个看设置中并没有多余wifi，但这个热点点其它信息可以获取到，说明这个热点是存在的，应该是该热点隐藏了，所以获取不到。这也就是手机设置中为什么会有添加网路的按钮了。

第二个问题，当附近wifi热点比较少时不会出现此问题，当附近wifi网络比较多时会出现此问题。这就需要将同名的热点进行删除，但是如果真有两个ssid名相同的wifi，那就可以通过capabilities去区分吧，如果capabilities也相同就没办法了，系统设置里面也不显示同名的。

修改上面的方法 startScan（）。

public void startScan(Context context) {
    mWifiManager.startScan();
       //得到扫描结果
    List<ScanResult> results = mWifiManager.getScanResults();
    // 得到配置好的网络连接
    mWifiConfiguration = mWifiManager.getConfiguredNetworks();
    if (results == null) {
        if(mWifiManager.getWifiState()==3){
            Toast.makeText(context,"当前区域没有无线网络",Toast.LENGTH_SHORT).show();
        }else if(mWifiManager.getWifiState()==2){
            Toast.makeText(context,"wifi正在开启，请稍后扫描", Toast.LENGTH_SHORT).show();
        }else{Toast.makeText(context,"WiFi没有开启", Toast.LENGTH_SHORT).show();
        }
    } else {
    mWifiList = new ArrayList();
    for(ScanResult result : results){
        if (result.SSID == null || result.SSID.length() == 0 || result.capabilities.contains("[IBSS]")) {
            continue;
        }
        boolean found = false;
        for(ScanResult item:mWifiList){
                    if(item.SSID.equals(result.SSID)&&item.capabilities.equals(result.capabilities)){
                found = true;break;
            }
        }
        if(!found){
            mWifiList.add(result);
        }
    }
    }
}

这样就可以避免出现上面的两种情况了。

代码：

public class MainActivity extends Activity implements OnClickListener {
    public static final String TAG = "MainActivity";
    private Button check_wifi,open_wifi,close_wifi,scan_wifi;
    private ListView mlistView;
    protected WifiAdmin mWifiAdmin;
    private List<ScanResult> mWifiList;
    public int level;
    protected String ssid;  

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mWifiAdmin = new WifiAdmin(MainActivity.this);
        initViews();
        IntentFilter filter = new IntentFilter(
                WifiManager.NETWORK_STATE_CHANGED_ACTION);
        //="android.net.wifi.STATE_CHANGE"  监听wifi状态的变化
        registerReceiver(mReceiver, filter);
        mlistView.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                AlertDialog.Builder alert=new AlertDialog.Builder(MainActivity.this);
                ssid=mWifiList.get(position).SSID;
                alert.setTitle(ssid);
                alert.setMessage("输入密码");
                final EditText et_password=new EditText(MainActivity.this);
                final SharedPreferences preferences=getSharedPreferences("wifi_password",Context.MODE_PRIVATE);
                et_password.setText(preferences.getString(ssid, ""));
                alert.setView(et_password);
                //alert.setView(view1);
                alert.setPositiveButton("连接", new DialogInterface.OnClickListener(){
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        String pw = et_password.getText().toString();
                        if(null == pw  || pw.length() < 8){
                                    Toast.makeText(MainActivity.this, "密码至少8位", Toast.LENGTH_SHORT).show();
                                return;
                            }
                            Editor editor=preferences.edit();
                            editor.putString(ssid, pw);   //保存密码
                            editor.commit();
                        mWifiAdmin.addNetwork(mWifiAdmin.CreateWifiInfo(ssid, et_password.getText().toString(), 3));
                    }
                });
                alert.setNegativeButton("取消", new DialogInterface.OnClickListener(){
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        //
                        //mWifiAdmin.removeWifi(mWifiAdmin.getNetworkId());
                    }
                });
                alert.create();
                alert.show();  

            }
        });
    }  

    /*
     * 控件初始化
     * */
    private void initViews() {
        check_wifi=(Button) findViewById(R.id.check_wifi);
        open_wifi=(Button) findViewById(R.id.open_wifi);
        close_wifi=(Button) findViewById(R.id.close_wifi);
        scan_wifi=(Button) findViewById(R.id.scan_wifi);
        mlistView=(ListView) findViewById(R.id.wifi_list);
        check_wifi.setOnClickListener(MainActivity.this);
        open_wifi.setOnClickListener(MainActivity.this);
        close_wifi.setOnClickListener(MainActivity.this);
        scan_wifi.setOnClickListener(MainActivity.this);
    }  

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.check_wifi:
            mWifiAdmin.checkState(MainActivity.this);
            break;
        case R.id.open_wifi:
            mWifiAdmin.openWifi(MainActivity.this);
            break;
        case R.id.close_wifi:
            mWifiAdmin.closeWifi(MainActivity.this);
            break;
        case R.id.scan_wifi:
            mWifiAdmin.startScan(MainActivity.this);
            mWifiList=mWifiAdmin.getWifiList();
            if(mWifiList!=null){
                mlistView.setAdapter(new MyAdapter(this,mWifiList));
                new Utility().setListViewHeightBasedOnChildren(mlistView);
            }
            break;
        default:
            break;
        }
    }  

    public class MyAdapter extends BaseAdapter{
        LayoutInflater inflater;
        List<ScanResult> list;
        public MyAdapter(Context context, List<ScanResult> list){
            this.inflater=LayoutInflater.from(context);
            this.list=list;
        }
        @Override
        public int getCount() {
            return list.size();
        }
        @Override
        public Object getItem(int position) {
            return position;
        }
        @Override
        public long getItemId(int position) {
            return position;
        }
        @SuppressLint({ "ViewHolder", "InflateParams" })
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            View view=null;
            view=inflater.inflate(R.layout.wifi_listitem, null);
            ScanResult scanResult = list.get(position);
            TextView wifi_ssid=(TextView) view.findViewById(R.id.ssid);
            ImageView wifi_level=(ImageView) view.findViewById(R.id.wifi_level);
            wifi_ssid.setText(scanResult.SSID);
            Log.i(TAG, "scanResult.SSID="+scanResult);
            level=WifiManager.calculateSignalLevel(scanResult.level,5);
            if(scanResult.capabilities.contains("WEP")||scanResult.capabilities.contains("PSK")||
                    scanResult.capabilities.contains("EAP")){
                wifi_level.setImageResource(R.drawable.wifi_signal_lock);
            }else{
                wifi_level.setImageResource(R.drawable.wifi_signal_open);
            }
            wifi_level.setImageLevel(level);
            //判断信号强度，显示对应的指示图标
             return view;
        }
    }  

    /*设置listview的高度*/
    public class Utility {
        public void setListViewHeightBasedOnChildren(ListView listView) {
            ListAdapter listAdapter = listView.getAdapter();
            if (listAdapter == null) {
                return;
            }
            int totalHeight = 0;
            for (int i = 0; i < listAdapter.getCount(); i++) {
                View listItem = listAdapter.getView(i, null, listView);
                listItem.measure(0, 0);
                totalHeight += listItem.getMeasuredHeight();
            }
            ViewGroup.LayoutParams params = listView.getLayoutParams();
            params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1));
            listView.setLayoutParams(params);
        }
    }
    //监听wifi状态
    private BroadcastReceiver mReceiver = new BroadcastReceiver (){
        @Override
        public void onReceive(Context context, Intent intent) {
            ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);    

            NetworkInfo wifiInfo = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
            if(wifiInfo.isConnected()){
                WifiManager wifiManager = (WifiManager) context
                        .getSystemService(Context.WIFI_SERVICE);
                String wifiSSID = wifiManager.getConnectionInfo()
                        .getSSID();
                Toast.makeText(context, wifiSSID+"连接成功", 1).show();
            }
        }     

    };
}

2、相关类说明补充

ScanResult类

这个类主要是通过Wifi硬件的扫描来获取一些周边的wifi热点（access point）的信息。该类主要有5个域，

打印信息如下所示：

WifiConfiguration类

通过该类获取一个wifi网络的网络配置，包括安全配置等。它包含6个子类，如下所示：

该类内容较多，不一一例举，需要用到的时候可以查Android SDK。

WifiInfo类

该类可以获得已经建立的或处于活动状态的wifi网络的状态信息。常用方法如下：

代码：

mWifiManager = (WifiManager)getSystemService(Context.WIFI_SERVICE);
mWifiInfo = mWifiManager.getConnectionInfo();
if(null != mWifiInfo && null != mWifiInfo.getSSID()){
        String info = "getSSID()="+mWifiInfo.getSSID()+"\n"
                +"getBSSID()="+mWifiInfo.getBSSID()+"\n"
                +"getHiddenSSID()="+mWifiInfo.getHiddenSSID()+"\n"
                +"getLinkSpeed()="+mWifiInfo.getLinkSpeed()+"\n"
                +"getMacAddress()="+mWifiInfo.getMacAddress()+"\n"
                +"getNetworkId()="+mWifiInfo.getNetworkId()+"\n"
                +"getRssi()="+mWifiInfo.getRssi()+"\n"
                +"getSupplicantState()="+mWifiInfo.getSupplicantState()+"\n"
                +"getDetailedStateOf()="+mWifiInfo.getDetailedStateOf(mWifiInfo.getSupplicantState());
        mTVWifiInfo.setText(info);
}else {
        mTVWifiInfo.setText("没有连接到wifi");
}

WifiManager类

该类用于管理Wifi连接，定义了许多常量和方法，这里就不一一说了。

常用方法。

需要指出的是getWifiState()方法是反悔wifi的状态，有整型常量表示，

四、Android WiFi开发 （二）Wifi热点

这个章节主要说一下手机开启Wifi热点。

demo的下载地址会在最下面贴出来。

1、创建WiFi热点

经测试开启wifi热点（无秘密，wpa安全类型，wpa2安全类型）都可以正常开启并使用。

需要注意的是wifi和wifi热点不能同时打开，也就是连接wifi的时候，开启热点需要先将wifi关闭才可以。

用到的主要代码：

package com.vn.wifitest.utils;  

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.wifi.WifiConfiguration;
import android.net.wifi.WifiConfiguration.KeyMgmt;
import android.net.wifi.WifiManager;
import android.os.Handler;
import android.util.Log;  

public class WifiAPUtil {
    private static final String TAG = "WifiAPUtil";
    public final static boolean DEBUG = true;  

    public static final int MESSAGE_AP_STATE_ENABLED = 1;
    public static final int MESSAGE_AP_STATE_FAILED = 2;
    //默认wifi秘密
    private static final String DEFAULT_AP_PASSWORD = "12345678";
    private static WifiAPUtil sInstance;
    private static Handler mHandler;
    private static Context mContext;
    private WifiManager mWifiManager;
    //监听wifi热点的状态变化
    public static final String WIFI_AP_STATE_CHANGED_ACTION = "android.net.wifi.WIFI_AP_STATE_CHANGED";
    public static final String EXTRA_WIFI_AP_STATE = "wifi_state";
    public static int WIFI_AP_STATE_DISABLING = 10;
    public static int WIFI_AP_STATE_DISABLED = 11;
    public static int WIFI_AP_STATE_ENABLING = 12;
    public static int WIFI_AP_STATE_ENABLED = 13;
    public static int WIFI_AP_STATE_FAILED = 14;
    public enum WifiSecurityType {
        WIFICIPHER_NOPASS, WIFICIPHER_WPA, WIFICIPHER_WEP, WIFICIPHER_INVALID, WIFICIPHER_WPA2
    }
    private WifiAPUtil(Context context) {
        if(DEBUG) Log.d(TAG,"WifiAPUtils construct");
        mContext = context;
        mWifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
        IntentFilter filter = new IntentFilter();
        filter.addAction(WIFI_AP_STATE_CHANGED_ACTION);
        context.registerReceiver(mWifiStateBroadcastReceiver, filter);
    }
    protected void finalize() {
        if(DEBUG) Log.d(TAG,"finalize");
        mContext.unregisterReceiver(mWifiStateBroadcastReceiver);  

}
    public static WifiAPUtil getInstance(Context c) {
        if (null == sInstance)
            sInstance = new WifiAPUtil(c);
        return sInstance;
    }  

    public boolean turnOnWifiAp(String str, String password,WifiSecurityType Type) {
        String ssid = str;
        //配置热点信息。
        WifiConfiguration wcfg = new WifiConfiguration();
        wcfg.SSID = new String(ssid);
        wcfg.networkId = 1;
        wcfg.allowedAuthAlgorithms.clear();
        wcfg.allowedGroupCiphers.clear();
        wcfg.allowedKeyManagement.clear();
        wcfg.allowedPairwiseCiphers.clear();
        wcfg.allowedProtocols.clear();  

        if(Type == WifiSecurityType.WIFICIPHER_NOPASS) {
            if(DEBUG)Log.d(TAG, "wifi ap----no password");
            wcfg.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN, true);
            wcfg.wepKeys[0] = "";
            wcfg.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
            wcfg.wepTxKeyIndex = 0;
        } else if(Type == WifiSecurityType.WIFICIPHER_WPA) {
            if(DEBUG)Log.d(TAG, "wifi ap----wpa");
            //密码至少8位，否则使用默认密码
            if(null != password && password.length() >= 8){
                wcfg.preSharedKey = password;
            } else {
                wcfg.preSharedKey = DEFAULT_AP_PASSWORD;
            }
            wcfg.hiddenSSID = false;
            wcfg.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN);
            wcfg.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);
            wcfg.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK);
            //wcfg.allowedKeyManagement.set(4);
            wcfg.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP);
            wcfg.allowedProtocols.set(WifiConfiguration.Protocol.WPA);
            wcfg.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
            wcfg.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP);
        } else if(Type == WifiSecurityType.WIFICIPHER_WPA2) {
            if(DEBUG)Log.d(TAG, "wifi ap---- wpa2");
            //密码至少8位，否则使用默认密码
            if(null != password && password.length() >= 8){
                wcfg.preSharedKey = password;
            } else {
                wcfg.preSharedKey = DEFAULT_AP_PASSWORD;
            }
            wcfg.hiddenSSID = true;
            wcfg.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN);
            wcfg.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);
            wcfg.allowedKeyManagement.set(4);
            //wcfg.allowedKeyManagement.set(4);
            wcfg.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP);
            wcfg.allowedProtocols.set(WifiConfiguration.Protocol.WPA);
            wcfg.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
            wcfg.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP);
        }
        try {
            Method method = mWifiManager.getClass().getMethod("setWifiApConfiguration",
                                      wcfg.getClass());
            Boolean rt = (Boolean)method.invoke(mWifiManager, wcfg);
            if(DEBUG) Log.d(TAG, " rt = " + rt);
        } catch (NoSuchMethodException e) {
            Log.e(TAG, e.getMessage());
        } catch (IllegalArgumentException e) {
            Log.e(TAG, e.getMessage());
        } catch (IllegalAccessException e) {
            Log.e(TAG, e.getMessage());
        } catch (InvocationTargetException e) {
            Log.e(TAG, e.getMessage());
        }
        return setWifiApEnabled();
    }
    //获取热点状态
    public int getWifiAPState() {
        int state = -1;
        try {
            Method method2 = mWifiManager.getClass().getMethod("getWifiApState");
            state = (Integer) method2.invoke(mWifiManager);
        } catch (Exception e) {
            Log.e(TAG, e.getMessage());
        }
        if(DEBUG)Log.i("WifiAP", "getWifiAPState.state " + state);
        return state;
    }  

    private boolean setWifiApEnabled() {
        //开启wifi热点需要关闭wifi
        while(mWifiManager.getWifiState() != WifiManager.WIFI_STATE_DISABLED){
            mWifiManager.setWifiEnabled(false);
            try {
                Thread.sleep(200);
            } catch (Exception e) {
                Log.e(TAG, e.getMessage());
                return false;
            }
        }
        // 确保wifi 热点关闭。
        while(getWifiAPState() != WIFI_AP_STATE_DISABLED){
            try {
            Method method1 = mWifiManager.getClass().getMethod("setWifiApEnabled",
                       WifiConfiguration.class, boolean.class);
            method1.invoke(mWifiManager, null, false);  

                Thread.sleep(200);
            } catch (Exception e) {
                Log.e(TAG, e.getMessage());
                    return false;
            }
        }  

        //开启wifi热点
        try {
        Method method1 = mWifiManager.getClass().getMethod("setWifiApEnabled",
                       WifiConfiguration.class, boolean.class);
        method1.invoke(mWifiManager, null, true);
                Thread.sleep(200);
            } catch (Exception e) {
                Log.e(TAG, e.getMessage());
                    return false;
            }
        return true;
    }
     //关闭WiFi热点
    public void closeWifiAp() {
        if (getWifiAPState() != WIFI_AP_STATE_DISABLED) {
            try {
                Method method = mWifiManager.getClass().getMethod("getWifiApConfiguration");
                method.setAccessible(true);
                WifiConfiguration config = (WifiConfiguration) method.invoke(mWifiManager);
                Method method2 = mWifiManager.getClass().getMethod("setWifiApEnabled", WifiConfiguration.class, boolean.class);
                method2.invoke(mWifiManager, config, false);
            } catch (NoSuchMethodException e) {
                e.printStackTrace();
            } catch (IllegalArgumentException e) {
                e.printStackTrace();
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            } catch (InvocationTargetException e) {
                e.printStackTrace();
            }
        }
    }    

    public void regitsterHandler(Handler handler){
        mHandler = handler;
    }
    public void unregitsterHandler(){
        mHandler = null;
    }
    //监听wifi热点状态变化
    private BroadcastReceiver mWifiStateBroadcastReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
        if(DEBUG)Log.i(TAG,"WifiAPUtils onReceive: "+intent.getAction());
        if(WIFI_AP_STATE_CHANGED_ACTION.equals(intent.getAction())) {
            int cstate = intent.getIntExtra(EXTRA_WIFI_AP_STATE, -1);
            if(cstate == WIFI_AP_STATE_ENABLED) {
                if(mHandler != null){
                    mHandler.sendEmptyMessage(MESSAGE_AP_STATE_ENABLED);
                }
            }if(cstate == WIFI_AP_STATE_DISABLED  || cstate == WIFI_AP_STATE_FAILED) {
            if(mHandler != null)
                mHandler.sendEmptyMessage(MESSAGE_AP_STATE_FAILED);
            }
        }
        }
    };
    //获取热点ssid
    public String getValidApSsid() {
        try {
            Method method = mWifiManager.getClass().getMethod("getWifiApConfiguration");
            WifiConfiguration configuration = (WifiConfiguration)method.invoke(mWifiManager);
            return configuration.SSID;
        } catch (Exception e) {
                Log.e(TAG, e.getMessage());
                return null;
                }
    }
    //获取热点密码
    public String getValidPassword(){
        try {
            Method method = mWifiManager.getClass().getMethod("getWifiApConfiguration");
            WifiConfiguration configuration = (WifiConfiguration)method.invoke(mWifiManager);
            return configuration.preSharedKey;
        } catch (Exception e) {
                Log.e(TAG, e.getMessage());
                return null;
                }  

    }
    //获取热点安全类型
    public int getValidSecurity(){
        WifiConfiguration configuration;
        try {
            Method method = mWifiManager.getClass().getMethod("getWifiApConfiguration");
            configuration = (WifiConfiguration)method.invoke(mWifiManager);
        } catch (Exception e) {
                Log.e(TAG, e.getMessage());
                return WifiSecurityType.WIFICIPHER_INVALID.ordinal();
                }  

        if(DEBUG)Log.i(TAG,"getSecurity security="+configuration.allowedKeyManagement);
        if(configuration.allowedKeyManagement.get(KeyMgmt.NONE)) {
            return WifiSecurityType.WIFICIPHER_NOPASS.ordinal();
        }else if(configuration.allowedKeyManagement.get(KeyMgmt.WPA_PSK)) {
            return WifiSecurityType.WIFICIPHER_WPA.ordinal();
        }else if(configuration.allowedKeyManagement.get(4)) { //4 means WPA2_PSK
            return WifiSecurityType.WIFICIPHER_WPA2.ordinal();
        }
        return WifiSecurityType.WIFICIPHER_INVALID.ordinal();
    }
}

使用方法：

使用方法：

//初始化WifiAPUtil类
WifiAPUtil.getInstance(getApplicationContext())
//注册handler
WifiAPUtil.getInstance(this).regitsterHandler(mHandler);
//接收message，做处理
private Handler mHandler = new Handler(){
    public void handleMessage(Message msg) {
        switch (msg.what) {
            case WifiAPUtil.MESSAGE_AP_STATE_ENABLED:
                String ssid = WifiAPUtil.getInstance(WifiApActivity.this).getValidApSsid();
                String pw = WifiAPUtil.getInstance(WifiApActivity.this).getValidPassword();
                int security = WifiAPUtil.getInstance(WifiApActivity.this).getValidSecurity();
                mWifiApState.setText("wifi热点开启成功"+"\n"
                        +"SSID = "+ssid+"\n"
                        +"Password = "+pw +"\n"
                        +"Security = "+security);
                break;
            case WifiAPUtil.MESSAGE_AP_STATE_FAILED:
                mWifiApState.setText("wifi热点关闭");
                break;
            default:
                break;
        }
    }
};

在activity销毁的时候

@Override
protected void onDestroy() {
    super.onDestroy();
    WifiAPUtil.getInstance(this).unregitsterHandler();
}

添加点击事件

//开启wifi热点
WifiAPUtil.getInstance(WifiApActivity.this).turnOnWifiAp(ssid, password, mWifiType);

//关闭wifi热点
WifiAPUtil.getInstance(WifiApActivity.this).closeWifiAp();

2、监听热点的状态

当wifi热点状态发送变化，系统会发送广播 Android.net.wifi.WIFI_AP_STATE_CHANGED，所以我们只要注册监听这个广播就可以了。

wifi ap状态值。

public static final String EXTRA_WIFI_AP_STATE = "wifi_state";
public static int WIFI_AP_STATE_DISABLING = 10;
public static int WIFI_AP_STATE_DISABLED = 11;
public static int WIFI_AP_STATE_ENABLING = 12;
public static int WIFI_AP_STATE_ENABLED = 13;
public static int WIFI_AP_STATE_FAILED = 14;

动态注册

public static final String WIFI_AP_STATE_CHANGED_ACTION = "android.net.wifi.WIFI_AP_STATE_CHANGED";
//注册广播接收者
IntentFilter filter = new IntentFilter();
filter.addAction(WIFI_AP_STATE_CHANGED_ACTION);
context.registerReceiver(mWifiStateBroadcastReceiver, filter);

广播接收者

通过监听wifiap状态的变化，发送消息给相关activity

//监听wifi热点状态变化
private BroadcastReceiver mWifiStateBroadcastReceiver = new BroadcastReceiver() {
    @Override
        public void onReceive(Context context, Intent intent) {
    if(DEBUG)Log.i(TAG,"WifiAPUtils onReceive: "+intent.getAction());
    if(WIFI_AP_STATE_CHANGED_ACTION.equals(intent.getAction())) {
            int cstate = intent.getIntExtra(EXTRA_WIFI_AP_STATE, -1);
            if(cstate == WIFI_AP_STATE_ENABLED) {
                if(mHandler != null){
                    mHandler.sendEmptyMessage(MESSAGE_AP_STATE_ENABLED);
                }
            }if(cstate == WIFI_AP_STATE_DISABLED  || cstate == WIFI_AP_STATE_FAILED) {
            if(mHandler != null)
                mHandler.sendEmptyMessage(MESSAGE_AP_STATE_FAILED);
            }
        }
     }
};

3、遗留问题

在配置wificonfiguration的时候有过属性是hiddenSSID，这个是设置wifi热点AP是否隐藏的，

但是设置wcfg.hiddenSSID = true或false并没有发现有什么不同，按理说设置为true，ssid隐藏应该搜索不到这个热点，

但是都可以搜索到。还请知道的可以留言指教，十分感谢。

之前有朋友说5.0系统的开启热点有问题，我这里没有5.0的手机，使用华为p9Android6.0手机测试确实开启不了热点，需要添加write_settings，添加上此权限就可以成功开启了。

五、其他补充

没有

代码下载：http://www.demodashi.com/demo/10660.html

注：本文著作权归作者，由demo大师发表，拒绝转载，转载需要作者授权