Android —— Wifi功能开发

其他 2018-06-22 09:25:27 阅读次数: 3

一. 加入Wifi工具类

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.widget.Toast;

import java.util.ArrayList;
import java.util.List;

/**
 * Wifi工具类
 */

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
    WifiManager.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, "Wifi正在开启", Toast.LENGTH_SHORT).show();
        } else {
            Toast.makeText(context, "Wifi已经开启", 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 int checkState(Context context) {
        if (mWifiManager.getWifiState() == 0) {
            Toast.makeText(context, "Wifi正在关闭", Toast.LENGTH_SHORT).show();
            return 0;
        } else if (mWifiManager.getWifiState() == 1) {
            Toast.makeText(context, "Wifi已经关闭", Toast.LENGTH_SHORT).show();
            return 1;
        } else if (mWifiManager.getWifiState() == 2) {
            Toast.makeText(context, "Wifi正在开启", Toast.LENGTH_SHORT).show();
            return 2;
        } else if (mWifiManager.getWifiState() == 3) {
            Toast.makeText(context, "Wifi已经开启", Toast.LENGTH_SHORT).show();
            return 3;
        } else {
            Toast.makeText(context, "没有获取到WiFi状态", Toast.LENGTH_SHORT).show();
            return 4;
        }
    }

    // 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;
    }

    /**
     * 搜索附近的热点信息，并返回所有热点为信息的SSID集合数据
     */
    public List<String> getScanWifiResult() {
        // 扫描的热点数据
        List<ScanResult> resultList;
        // 开始扫描热点
        mWifiManager.startScan();
        resultList = mWifiManager.getScanResults();
        ArrayList<String> ssids = new ArrayList<String>();
        if (resultList != null) {
            for (ScanResult scan : resultList) {
                ssids.add(scan.SSID);// 遍历数据，取得ssid数据集
            }
        }
        return ssids;
    }
}

二. wifi列表xml布局

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_gravity="center_vertical"
    android:layout_height="35dp">

    <TextView
        android:id="@+id/ssid"
        android:layout_width="wrap_content"
        android:gravity="center_vertical"
        android:layout_marginLeft="10dp"
        android:layout_height="35dp" />

    <ImageView
        android:id="@+id/wifi_level"
        android:layout_width="35dp"
        android:layout_height="35dp"
        android:layout_alignParentRight="true"
        android:layout_marginRight="10dp" />


</RelativeLayout>

三. wifi列表适配器

import android.annotation.SuppressLint;
import android.content.Context;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiManager;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.List;

import static android.content.ContentValues.TAG;

/**
 * wifi列表适配器
 */

public class MyAdapter extends BaseAdapter {
    LayoutInflater inflater;
    List<ScanResult> list;
    public int level;

    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;
    }
}

四. activity.xml布局

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:id="@+id/scan_wifi"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="wifi配置"
        android:layout_alignParentTop="true"
        android:layout_margin="10dp"
        android:layout_alignParentStart="true"/>

    <ListView
        android:id="@+id/mlistView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/scan_wifi"
        android:layout_marginTop="15dp" />

</RelativeLayout>

五. MainActivity实现

import android.app.Activity;
import android.app.ProgressDialog;
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.WifiManager;
import android.os.Handler;
import android.support.v7.app.AlertDialog;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;

import java.util.List;


public class MainActivity extends Activity implements View.OnClickListener {

    private Button scan_wifi;       //wifi配置按钮
    private ListView mlistView;     //wifi列表显示控件
    protected WifiAdmin mWifiAdmin;     //wifi工具类
    private List<ScanResult> mWifiList; //获取wifi列表
    protected String ssid;      //wifi的SSID
    private ProgressDialog dialog = null;

    Handler mHandler = new Handler();

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mWifiAdmin = new WifiAdmin(MainActivity.this);
        dialog = new ProgressDialog(this);
        progressShow();
        initViews();
        IntentFilter filter = new IntentFilter(WifiManager.NETWORK_STATE_CHANGED_ACTION);
        registerReceiver(mReceiver, filter);
        mlistView.setOnItemClickListener(new AdapterView.OnItemClickListener() {    //listview处理
            @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;
                        }
                        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) {
                    }
                });
                alert.create();
                alert.show();
            }
        });
    }

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

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.scan_wifi:
                int mode = mWifiAdmin.checkState(MainActivity.this);    //获取是否开启wifi
                if (mode == 1)      //wifi是关闭状态
                    mWifiAdmin.openWifi(MainActivity.this);     //打开wifi
                dialog.show();      //显示加载进度框
                mWifiAdmin.startScan(MainActivity.this);    //搜索wifi
                mWifiList = mWifiAdmin.getWifiList();       //获取wifi列表
                if (mWifiList != null) {
                    //清除SSID为空的list参数
                    for (int i = 0; i < mWifiList.size(); i++) {
                        if (TextUtils.isEmpty(mWifiList.get(i).SSID)) {
                            mWifiList.remove(i);
                        }
                    }
                }
                mHandler.postDelayed(new Runnable() {     //5秒后获取wifi列表（打开wifi需要时间）
                    @Override
                    public void run() {
                        dialog.dismiss();
                        mlistView.setAdapter(new MyAdapter(MainActivity.this, mWifiList));  //列表显示wifi
                    }
                }, 5000);
                break;

        }
    }

    //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", Toast.LENGTH_SHORT).show();
            }
        }
    };

    //进度框
    public void progressShow() {
        dialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
        dialog.setMessage("正在扫描WIFI。。。");
        dialog.setCancelable(false);
    }

}

六. 权限配置

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<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_MULTICAST_STATE" />
<uses-permission android:name="android.permission.INTERNET" />

注：我是在targetSdkVersion = 22 的情况下进行的wifi功能实现，如果targetSdkVersion过高wifi列表会刷新不出来。

每天进步一点点！


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