android通过代码连接wifi

Android SDK API 29（对应Android 10）以下，可以在app之中通过代码直接设置wifi名称和密码进行连接。

API 29及其以上版本，增加了动态管理权限功能，弃用了之前的接口，同时app连接wifi时必须通过用户同意，具体方式是弹出一个页面显示要连接的wifi，用户点击连接之后再返回app。

1. API

a. 首先初始化，检查权限，若无则申请权限

//检查wifi权限if (ContextCompat.checkSelfPermission(MainActivity.this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {    //若无则申请    ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 1);}else{    //初始化    wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);}

 b. 扫描wifi，以供后续操作，若不执行这一步直接连接则会出错：

//扫描并列出wifi，以供后续操作wifiScanReceiver = new BroadcastReceiver() {    @Override    public void onReceive(Context context, Intent intent) {        boolean success = intent.getBooleanExtra(WifiManager.EXTRA_RESULTS_UPDATED, false);        if (success) {            scanResults = wifiManager.getScanResults();            for (ScanResult scanResult : scanResults) {                String SSID = scanResult.SSID;                String BSSID = scanResult.BSSID;                String capabilities = scanResult.capabilities;                int level = scanResult.level;                Log.d("WIFISCAN", "SSID: " + SSID + ", BSSID: " + BSSID);            }        }    }};IntentFilter intentFilter = new IntentFilter();intentFilter.addAction(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION);registerReceiver(wifiScanReceiver, intentFilter);wifiManager.startScan();

c. 连接指定wifi，此处为了演示直接填写ssid和密码，实际情况之中可以从上一步的wifi列表之中选取，并由用户输入（api>=29时这一步是可以运行，但无连接wifi的效果）：

WifiConfiguration wifiConfiguration = new WifiConfiguration();//注意，密码和SSID两边必须再加一对双引号！！！wifiConfiguration.SSID = "\"wifi SSID\"";  wifiConfiguration.preSharedKey = "\"password\"";int networkId = wifiManager.addNetwork(wifiConfiguration);//wifiManager.disconnect();  //断开链接wifiManager.enableNetwork(networkId, true);wifiManager.reconnect();Log.d("ConnectWifi", "reconnect ok!");

2. API

GitHub - ThanosFisherman/WifiUtils: Easily Connect to WiFi Networks

更加简单，适用于api小于29的android，api>29时无法正常搜索到wifi：

//开启wifiWifiUtils.withContext(getApplicationContext()).enableWifi();        //搜索wifiWifiUtils.withContext(getApplicationContext()).scanWifi(this::getScanResults).start();

处理搜索结果：

private void getScanResults(@NonNull final List results){    if (results.isEmpty())    {        Log.i(TAG, "SCAN RESULTS IT'S EMPTY");        return;    }    Log.i(TAG, "GOT SCAN RESULTS " + results);}

若不为空，则连接指定wifi：

//连接wifiWifiUtils.withContext(getApplicationContext())  .connectWith("wifi SSID", "password")  .setTimeout(40000)  .onConnectionResult(new ConnectionSuccessListener() {      @Override      public void success() {          Toast.makeText(MainActivity.this, "SUCCESS!", Toast.LENGTH_SHORT).show();      }      @Override      public void failed(@NonNull ConnectionErrorCode errorCode) {          Toast.makeText(MainActivity.this, "EPIC FAIL!" + errorCode.toString(), Toast.LENGTH_SHORT).show();      }  })  .start();

 3. API >= 29

API大于29时，弃用了WifiConfiguration这个更加底层可以直接操作的类。但是初始化和搜索wifi列表的代码与API