Android开发wifi功能(附近Wi-Fi，输入密码，链接Wi-Fi)

嗨，今天给大家带来Android开发wifi模块的功能，包涵检查网络状态，开启Wi-Fi，关闭Wi-Fi，扫描附近Wi-Fi，链接Wi-Fi，…

首先创建两个.xml界面，如下：mbtton.xml ,wifi_listitem.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="vertical"><LinearLayout
        android:id="@+id/toolbar"android:layout_width="match_parent"android:layout_height="wrap_content"><include layout="@layout/test_gridview_item"/></LinearLayout><LinearLayout
        android:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="vertical"><Button
            android:id="@+id/check_wifi"android:layout_width="match_parent"android:layout_height="wrap_content"android:text="检查"/><Button
            android:id="@+id/open_wifi"android:layout_width="match_parent"android:layout_height="wrap_content"android:text="打开"/><Button
            android:id="@+id/close_wifi"android:layout_width="match_parent"android:layout_height="wrap_content"android:text="关闭"/><Button
            android:id="@+id/scan_wifi"android:layout_width="match_parent"android:layout_height="wrap_content"android:text="扫描"/><ListView
            android:id="@+id/wifi_list"android:layout_width="match_parent"android:layout_height="wrap_content"></ListView></LinearLayout>
</LinearLayout>

wifi_listitem.xml界面：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="vertical"><LinearLayout
        android:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="vertical"><TextView
            android:id="@+id/ssid"android:layout_width="match_parent"android:layout_height="wrap_content"android:text="123"/><ImageView
            android:id="@+id/wifi_level"android:layout_width="30dip"android:layout_height="30dip"android:background="@mipmap/ic_launcher"/></LinearLayout></LinearLayout>

然后就是建立java，adapter程序（MbuttonActivity.java ,WifiAdmin.java）

import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;import java.util.List;
/*** Created by rnd on 2018/3/12.*/public class MbuttonActivity extends Activity implements View.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;private LinearLayout toolbar;protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.mbutton);mWifiAdmin = new WifiAdmin(MbuttonActivity.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 AdapterView.OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> parent, View view,int position, long id) {AlertDialog.Builder alert=new AlertDialog.Builder(MbuttonActivity.this);ssid=mWifiList.get(position).SSID;alert.setTitle(ssid);alert.setMessage("输入密码");final EditText et_password=new EditText(MbuttonActivity.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(){@Overridepublic void onClick(DialogInterface dialog, int which) {String pw = et_password.getText().toString();if(null == pw  || pw.length() < 8){Toast.makeText(MbuttonActivity.this, "密码至少8位", Toast.LENGTH_SHORT).show();return;}SharedPreferences.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(){@Overridepublic 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);toolbar=findViewById(R.id.toolbar);check_wifi.setOnClickListener(MbuttonActivity.this);open_wifi.setOnClickListener(MbuttonActivity.this);close_wifi.setOnClickListener(MbuttonActivity.this);scan_wifi.setOnClickListener(MbuttonActivity.this);toolbar.setOnClickListener(MbuttonActivity.this);}@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.check_wifi:mWifiAdmin.checkState(MbuttonActivity.this);break;case R.id.open_wifi:mWifiAdmin.openWifi(MbuttonActivity.this);break;case R.id.close_wifi:mWifiAdmin.closeWifi(MbuttonActivity.this);break;case R.id.toolbar:finish();break;case R.id.scan_wifi:mWifiAdmin.startScan(MbuttonActivity.this);mWifiList=mWifiAdmin.getWifiList();if(mWifiList!=null){mlistView.setAdapter(new MyAdapter(this,mWifiList));new Utility().setListViewHeightBasedOnChildren(mlistView);}break;default:break;}}@Overridepublic void onPointerCaptureChanged(boolean hasCapture) {}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;}@Overridepublic int getCount() {return list.size();}@Overridepublic Object getItem(int position) {return position;}@Overridepublic long getItemId(int position) {return position;}@SuppressLint({ "ViewHolder", "InflateParams" })@Overridepublic 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.btoom_withe);}else{wifi_level.setImageResource(R.drawable.btoom_withe);}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 (){@Overridepublic 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();}}};
}

创建WifiAdmin.java程序入口；

import java.util.ArrayList;
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WifiLockWifiLock 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WIFIpublic 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WIFIpublic 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WifiLockpublic void acquireWifiLock() {mWifiLock.acquire();}// 解锁WifiLockpublic void releaseWifiLock() {// 判断时候锁定if (mWifiLock.isHeld()) {mWifiLock.acquire();}}// 创建一个WifiLockpublic 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);}}}}// 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、levelstringBuilder.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BSSIDpublic 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IDpublic 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;}
}

把代码都复制上去，就可以看到效果啦，是不是特别的爽，感觉好高端大气牛逼？如果觉得此篇文章对您有所帮助，请别忘记关注或点赞，博主还会继续发表更有趣的文章，有问题可以留言，望各位每天进步一点点，学无止境！！

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