Android WiFi开发

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