本文主要介绍通过广播消息监听网络状态的变化，Wifi可以自动打开，而后连接指定的Wifi网络。其中包括屏幕灭屏广播、字符串去除双引号的技术点。亲测可用，收藏发布到此，供大家借鉴学习。
1.工具类：WifiAutoConnectManager
import android.annotation.SuppressLint;import .wifi.WifiConfiguration;import .wifi.WifiManager;import android.text.TextUtils;import android.util.Log;import java.util.List;/*** Description：Wifi可以自动打开并连接指定的Wifi网络（工具类）*/public class WifiAutoConnectManager {private static final String TAG = WifiAutoConnectManager.class.getSimpleName();WifiManager wifiManager;// 定义几种加密方式，一种是WEP，一种是WPA，还有没有密码的情况public enum WifiCipherType {WIFICIPHER_WEP, WIFICIPHER_WPA, WIFICIPHER_NOPASS, WIFICIPHER_INVALID}// 构造函数public WifiAutoConnectManager(WifiManager wifiManager) {this.wifiManager = wifiManager;}// 提供一个外部接口，传入要连接的无线网public void connectWifi(String ssID, String passWord, WifiCipherType type) {Log.d(TAG,"connect：" + ssID + "，" + passWord + "，" + type);Thread thread = new Thread(new ConnectRunnable(ssID, passWord, type));thread.start();}// 查看以前是否也配置过这个网络private WifiConfiguration isExsits(String ssID) {Log.d(TAG,"isExsits：" + ssID);@SuppressLint("MissingPermission")List<WifiConfiguration> existingConfigs = wifiManager.getConfiguredNetworks();for (WifiConfiguration existingConfig : existingConfigs) {if (existingConfig.SSID.equals("\"" + ssID + "\"")) {return existingConfig;}}return null;}private WifiConfiguration createWifiInfo(String ssID, String passWord, WifiCipherType type) {Log.d(TAG,"createWifiInfo：" + ssID + "，" + passWord + "，" + type);WifiConfiguration config = new WifiConfiguration();config.allowedAuthAlgorithms.clear();config.allowedGroupCiphers.clear();config.allowedKeyManagement.clear();config.allowedPairwiseCiphers.clear();config.allowedProtocols.clear();config.SSID = "\"" + ssID + "\"";// NOPASSif (type == WifiCipherType.WIFICIPHER_NOPASS) {config.wepKeys[0] = "";config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);config.wepTxKeyIndex = 0;}// WEPif (type == WifiCipherType.WIFICIPHER_WEP) {if (!TextUtils.isEmpty(passWord)) {if (isHexWepKey(passWord)) {config.wepKeys[0] = passWord;} else {config.wepKeys[0] = "\"" + passWord + "\"";}}config.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN);config.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.SHARED);config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);config.wepTxKeyIndex = 0;}// WPAif (type == WifiCipherType.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);// 此处保证网络自动重联config.allowedProtocols.set(WifiConfiguration.Protocol.WPA);config.allowedGroupCiphers.set(MP);config.allowedPairwiseCiphers.set(MP);config.status = WifiConfiguration.Status.ENABLED;}return config;}// 打开wifi功能private boolean openWifi() {boolean isOpen = true;if (!wifiManager.isWifiEnabled()) {isOpen = wifiManager.setWifiEnabled(true);Log.d(TAG,"openWifi");}return isOpen;}// 关闭wifi功能public void closeWifi() {if (wifiManager.isWifiEnabled()) {wifiManager.setWifiEnabled(false);Log.d(TAG,"closeWifi");}}class ConnectRunnable implements Runnable {private String ssID;private String passWord;private WifiCipherType type;public ConnectRunnable(String ssID, String passWord, WifiCipherType type) {this.ssID = ssID;this.passWord = passWord;this.type = type;}@Overridepublic void run() {// 打开wifiopenWifi();// 开启wifi功能需要一段时间(我在手机上测试一般需要1-3秒左右)，所以要等到wifi// 状态变成WIFI_STATE_ENABLED的时候才能执行下面的语句while (wifiManager.getWifiState() == WifiManager.WIFI_STATE_ENABLING) {try {// 为了避免程序一直while循环，让它睡个100毫秒检测……Thread.sleep(100);} catch (InterruptedException e) {Log.d(TAG, "Wifi is InterruptedException! " + e.getMessage());}}WifiConfiguration wifiConfig = createWifiInfo(ssID, passWord, type);if (wifiConfig == null) {Log.d(TAG, "wifiConfig is null!");return;}WifiConfiguration tempConfig = isExsits(ssID);if (tempConfig != null) {wifiManager.removeNetwork(workId);}int netID = wifiManager.addNetwork(wifiConfig);boolean enabled = wifiManager.enableNetwork(netID, true);Log.d(TAG, "enableNetwork status enable = " + enabled);boolean connected = wifiManager.reconnect();Log.d(TAG, "enableNetwork connected = " + connected);}}private static boolean isHexWepKey(String wepKey) {Log.d(TAG,"isHexWepKey：" + wepKey);final int len = wepKey.length();// WEP-40, WEP-104, and some vendors using 256-bit WEP (WEP-232?)if (len != 10 && len != 26 && len != 58) {return false;}return isHex(wepKey);}private static boolean isHex(String key) {Log.d(TAG,"isHex：" + key);for (int i = key.length() - 1; i >= 0; i--) {final char c = key.charAt(i);if (!(c >= '0' && c <= '9' || c >= 'A' && c <= 'F' || c >= 'a' && c <= 'f')) {return false;}}return true;}}
2. 调用入口：MainActivity
import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import .ConnectivityManager;import workInfo;import .wifi.WifiInfo;import .wifi.WifiManager;import android.os.Bundle;import android.os.PowerManager;import android.text.TextUtils;import android.util.Log;import android.view.View;import android.widget.TextView;import android.widget.Toast;import androidx.appcompat.app.AppCompatActivity;/*** Description：通过广播消息监听网络状态的变化，连接指定的Wifi网络*/public class MainActivity extends AppCompatActivity {private String TAG = MainActivity.class.getSimpleName();private WifiAutoConnectManager wifiConnector;private TextView title, netWorkName;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initView();}private void initView(){Log.d(TAG,"initView");title = findViewById(R.id.title);netWorkName = findViewById(WorkName);WifiManager wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);wifiConnector = new WifiAutoConnectManager(wifiManager);//先关闭Wifi，再实现后面的自动重连功能wifiManager.setWifiEnabled(false);IntentFilter filter = new IntentFilter();// 屏幕灭屏广播filter.addAction(Intent.ACTION_SCREEN_OFF);filter.addAction(Intent.ACTION_SCREEN_ON);// 监听网络（Wifi）状态变化通知filter.addAction(WORK_STATE_CHANGED_ACTION);filter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION);filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);registerReceiver(wifiReceiver, filter);}private BroadcastReceiver wifiReceiver = new BroadcastReceiver() {@Overridepublic void onReceive(Context context, Intent intent) {String action = intent.getAction();Log.d(TAG, "action：" + action);if (Intent.ACTION_SCREEN_OFF.equals(action)) {//如果息屏PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);//保持cpu一直运行，不管屏幕是否黑屏PowerManager.WakeLock wakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "tag:CPUKeepRunning");wakeLock.acquire();Log.d(TAG, "screen off");}//wifi连接上与否if (intent.getAction().equals(WORK_STATE_CHANGED_ACTION)) {NetworkInfo info = intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);if (info.getState().equals(NetworkInfo.State.DISCONNECTED)) {Log.d(TAG, "wifi 已断开");connectWifi();Log.d(TAG, "wifi 重连中");} else if (info.getState().equals(NetworkInfo.State.CONNECTED)) {WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);WifiInfo wifiInfo = wifiManager.getConnectionInfo();String infoSSID = wifiInfo.getSSID();if (!TextUtils.isEmpty(infoSSID) && infoSSID.length() != 0) {title.setText("已连接上网络：");netWorkName.setVisibility(View.VISIBLE);String netWorkSSID = infoSSID.replace("\"","").replace("\"","");netWorkName.setText(netWorkSSID);//获取当前wifi名称Log.i(TAG, "连接到的网络：" + netWorkSSID);Toast.makeText(MainActivity.this, "已连接上网络：" + netWorkSSID, Toast.LENGTH_SHORT).show();}}}}};/*** 设置： WiFi名称和密码*/private void connectWifi() {Log.d(TAG, "connect");wifiConnector.connectWifi("MemoryTest", "Auto!1Test##", WifiAutoConnectManager.WifiCipherType.WIFICIPHER_WPA);}@Overridepublic void onDestroy() {super.onDestroy();if (wifiReceiver != null) {unregisterReceiver(wifiReceiver);}Log.d(TAG,"onDestroy，联网程序被终止");}}
3. 布局：activity_main
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="/apk/res/android"xmlns:app="/apk/res-auto"xmlns:tools="/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"tools:context=".MainActivity"><TextViewandroid:id="@+id/title"android:textSize="23sp"android:layout_marginTop="300dp"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerHorizontal="true"android:text="网络连接中. . ." /><TextViewandroid:id="@+id/netWorkName"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_below="@+id/title"android:layout_marginTop="30dp"android:textSize="30sp"android:textStyle="bold"android:gravity="center"android:visibility="visible"android:text="" /></RelativeLayout>
