Android 实现WiFi列表显示与连接，2021最新Android开发面试解答

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new Thread(new refreshWifiThread()).start();

break;

default:

break;

}

}

}

public void getAllNetWorkList() {

wifiArray = new ArrayList();

if (sb != null) {

sb = new StringBuffer();

}

wiFiAdmin.startScan();

list = wiFiAdmin.getWifiList();

if (list != null) {

for (int i = 0; i < list.size(); i++) {

mScanResult = list.get(i);

WifiInfo wifiInfo = new WifiInfo(mScanResult.BSSID,

mScanResult.SSID, mScanResult.capabilities,

mScanResult.level);

wifiArray.add(wifiInfo);

}

wifiInfoAdapter = new WiFiInfoAdapter(getApplicationContext(),

wifiArray);

listWifi.setAdapter(wifiInfoAdapter);

//

wiFiAdmin.getConfiguration();

listWifi.setOnItemClickListener(new AdapterView.OnItemClickListener() {

String wifiItemSSID = null;

public void onItemClick(android.widget.AdapterView<?> parent,

android.view.View view, int position, long id) {

Log.d(Constant.TAG, “BSSID:” + list.get(position).BSSID);

// 连接WiFi

wifiItemSSID = list.get(position).SSID;

int wifiItemId = wiFiAdmin.IsConfiguration("""

• list.get(position).SSID + “”");

if (wifiItemId != -1) {

if (wiFiAdmin.ConnectWifi(wifiItemId)) {

// 连接已保存密码的WiFi

Toast.makeText(getApplicationContext(), “正在连接”,

Toast.LENGTH_SHORT).show();

updateButton.setVisibility(View.INVISIBLE);

updat

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eProgress.setVisibility(View.VISIBLE);

new Thread(new refreshWifiThread()).start();

}

} else {

// 没有配置好信息，配置

WifiPswDialog pswDialog = new WifiPswDialog(

WifiListActivity.this,

new OnCustomDialogListener() {

@Override

public void back(String str) {

wifiPassword = str;

if (wifiPassword != null) {

int netId = wiFiAdmin

.AddWifiConfig(list,

wifiItemSSID,

wifiPassword);

if (netId != -1) {

wiFiAdmin.getConfiguration();// 添加了配置信息，要重新得到配置信息

if (wiFiAdmin

.ConnectWifi(netId)) {

// 连接成功，刷新UI

updateProgress

.setVisibility(View.VISIBLE);

updateButton

.setVisibility(View.INVISIBLE);

new Thread(

new refreshWifiThread())

.start();

}

} else {

// 网络连接错误

}

} else {

}

}

});

pswDialog.show();

}

}

});

}

}

}

然后是WiFiAdmin：

package com.tchip.carlauncher.util;

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.util.Log;

public class WifiAdmin {

/**

• 定义一个WifiManager对象,提供Wifi管理的各种主要API，主要包含wifi的扫描、建立连接、配置信息等

*/

private WifiManager mWifiManager;

// WIFIConfiguration描述WIFI的链接信息，包括SSID、SSID隐藏、password等的设置

private List wifiConfigList;

// 定义一个WifiInfo对象

private WifiInfo mWifiInfo;

// 扫描出的网络连接列表

private List mWifiList;

// 网络连接列表

private List mWifiConfigurations;

WifiLock mWifiLock;

public static final int TYPE_NO_PASSWD = 0x11;

public static final int TYPE_WEP = 0x12;

public static final int TYPE_WPA = 0x13;

public WifiAdmin(Context context) {

// 获得WifiManager对象

mWifiManager = (WifiManager) context

.getSystemService(Context.WIFI_SERVICE);

// 取得WifiInfo对象

mWifiInfo = mWifiManager.getConnectionInfo();

}

/**

• 打开wifi

*/

public void openWifi() {

if (!mWifiManager.isWifiEnabled()) {

mWifiManager.setWifiEnabled(true);

}

}

/**

• 关闭wifi

*/

public void closeWifi() {

if (!mWifiManager.isWifiEnabled()) {

mWifiManager.setWifiEnabled(false);

}

}

/**

• 检查当前wifi状态

• @return

*/

public int checkState() {

return mWifiManager.getWifiState();

}

/**

• 锁定wifiLock

*/

public void acquireWifiLock() {

mWifiLock.acquire();

}

/**

• 解锁wifiLock

*/

public void releaseWifiLock() {

// 判断是否锁定

if (mWifiLock.isHeld()) {

mWifiLock.acquire();

}

}

/**

• 创建一个wifiLock

*/

public void createWifiLock() {

mWifiLock = mWifiManager.createWifiLock(“test”);

}

/**

• 得到配置好的网络

• @return

*/

public List getWiFiConfiguration() {

return mWifiConfigurations;

}

/**

• 指定配置好的网络进行连接

• @param index

*/

public void connetionConfiguration(int index) {

if (index > mWifiConfigurations.size()) {

return;

}

// 连接配置好指定ID的网络

mWifiManager.enableNetwork(mWifiConfigurations.get(index).networkId,

true);

}

public void startScan() {

mWifiManager.startScan();

// 得到扫描结果

mWifiList = mWifiManager.getScanResults();

// 得到配置好的网络连接

mWifiConfigurations = mWifiManager.getConfiguredNetworks();

}

/**

• 得到网络列表

• @return

*/

public List getWifiList() {

return mWifiList;

}

/**

• 查看扫描结果

• @return

*/

public StringBuffer lookUpScan() {

StringBuffer sb = new StringBuffer();

for (int i = 0; i < mWifiList.size(); i++) {

sb.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

sb.append((mWifiList.get(i)).toString()).append("\n");

}

return sb;

}

public String getMacAddress() {

return (mWifiInfo == null) ? “NULL” : mWifiInfo.getMacAddress();

}

public String getBSSID() {

return (mWifiInfo == null) ? “NULL” : mWifiInfo.getBSSID();

}

public int getIpAddress() {

return (mWifiInfo == null) ? 0 : mWifiInfo.getIpAddress();

}

/**

• 得到连接的ID

• @return

*/

public int getNetWordId() {

return (mWifiInfo == null) ? 0 : mWifiInfo.getNetworkId();

}

/**

• 得到wifiInfo的所有信息

• @return

*/

public String getWifiInfo() {

return (mWifiInfo == null) ? “NULL” : mWifiInfo.toString();

}

/**

• 添加一个网络并连接

• @param configuration

*/

public void addNetwork(WifiConfiguration configuration) {

int wcgId = mWifiManager.addNetwork(configuration);

mWifiManager.enableNetwork(wcgId, true);

}

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) {

WifiConfiguration config = new WifiConfiguration();

if (mWifiList.size() > 0) {

for (int i = 0; i < mWifiList.size(); i++) {

if (mWifiList.get(i).SSID.equals(ssid)) {

config = mWifiConfigurations.get(i);

}

}

}

return config;

}

/**

• 断开指定ID的网络

• @param netId

*/

public void disConnectionWifi(int netId) {

mWifiManager.disableNetwork(netId);

mWifiManager.disconnect();

}

// ============

/**

• 连接指定Id的WIFI

• @param wifiId

• @return

*/

public boolean ConnectWifi(int wifiId) {

for (int i = 0; i < wifiConfigList.size(); i++) {

WifiConfiguration wifi = wifiConfigList.get(i);

if (wifi.networkId == wifiId) {

while (!(mWifiManager.enableNetwork(wifiId, true))) {// 激活该Id，建立连接

Log.i(“ConnectWifi”,

String.valueOf(wifiConfigList.get(wifiId).status));// status:0–已经连接，1–不可连接，2–可以连接

}

return true;

}

}

return false;

}

/**

• 得到Wifi配置好的信息

*/

public void getConfiguration() {

wifiConfigList = mWifiManager.getConfiguredNetworks();// 得到配置好的网络信息

for (int i = 0; i < wifiConfigList.size(); i++) {

Log.i(“getConfiguration”, wifiConfigList.get(i).SSID);

Log.i(“getConfiguration”,

String.valueOf(wifiConfigList.get(i).networkId));

}

}

/**

• 判定指定WIFI是否已经配置好,依据WIFI的地址BSSID,返回NetId

• @param SSID

• @return

*/

public int IsConfiguration(String SSID) {

Log.i(“IsConfiguration”, String.valueOf(wifiConfigList.size()));

for (int i = 0; i < wifiConfigList.size(); i++) {

Log.i(wifiConfigList.get(i).SSID,

String.valueOf(wifiConfigList.get(i).networkId));

if (wifiConfigList.get(i).SSID.equals(SSID)) {// 地址相同

return wifiConfigList.get(i).networkId;

}

}

return -1;

}

/**

• 添加指定WIFI的配置信息,原列表不存在此SSID

• @param wifiList

• @param ssid

• @param pwd

• @return

*/

public int AddWifiConfig(List wifiList, String ssid, String pwd) {

int wifiId = -1;

for (int i = 0; i < wifiList.size(); i++) {

ScanResult wifi = wifiList.get(i);

if (wifi.SSID.equals(ssid)) {

Log.i(“AddWifiConfig”, “equals”);

WifiConfiguration wifiCong = new WifiConfiguration();

wifiCong.SSID = “”" + wifi.SSID + “”";// “转义字符，代表”

wifiCong.preSharedKey = “”" + pwd + “”";// WPA-PSK密码

wifiCong.hiddenSSID = false;

wifiCong.status = WifiConfiguration.Status.ENABLED;

wifiId = mWifiManager.addNetwork(wifiCong);// 将配置好的特定WIFI密码信息添加,添加完成后默认是不激活状态，成功返回ID，否则为-1

if (wifiId != -1) {

return wifiId;

}

}

}

return wifiId;

}

}

密码对话框比较简单：

package com.tchip.carlauncher.ui.dialog;

import com.tchip.carlauncher.R;

import android.app.Dialog;

import android.content.Context;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

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