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() {
            @Override
            public 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(){
                    @Override
                    public 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(){
                    @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);
        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);
    }

    @Override
    public 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;
        }
    }

    @Override
    public 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;
        }
        @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.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 (){
        @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();
            }
        }

    };
}

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
        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、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;
    }
}

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！！