高等级

public class WifiFunction {

    private final String tag = WifiFunction.class.getSimpleName();
    private WifiManager wifiManager;

    public List<WifiDetail> getListofWifi(Context context) {

        List<WifiDetail> wifiDetails = new ArrayList<>();
        List<ScanResult> results = wifiManager.getScanResults();
        Log.d(tag,"Wifi Details " + wifiManager.getScanResults().size());
        for (ScanResult result : results) {
            wifiDetails.add(new WifiDetail(result.BSSID, result.SSID));
            Log.d(tag, result.BSSID + result.SSID);
        }
        return wifiDetails;
    }

    public void startScan(Context context)
    {
        wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
        wifiManager.startScan();
        IntentFilter filter = new IntentFilter();
        filter.addAction(SCAN_RESULTS_AVAILABLE_ACTION);
        context.registerReceiver(new resultReciever(this),filter);
    }

}

接收器类

public class resultReciever extends BroadcastReceiver {

    private WifiFunction wifiFunction;

    resultReciever(WifiFunction wifiFunction)
    {
        this.wifiFunction = wifiFunction;
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        Log.d("Receiver","started");
        wifiFunction.getListofWifi(context);
    }
}

主要活动我只是打电话：

(new WifiFunction()).startScan(this);

清单

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permisiion.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permisiion.ACCESS_FINE_LOCATION" />

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <receiver android:name=".resultReciever"/>
</application>

用户权限：

private boolean checkPermission() {

    List<String> permissionsList = new ArrayList<String>();

    if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_WIFI_STATE) != PackageManager.PERMISSION_GRANTED) {
        permissionsList.add(Manifest.permission.ACCESS_WIFI_STATE);
    }

    if (ContextCompat.checkSelfPermission(this, Manifest.permission.CHANGE_WIFI_STATE) != PackageManager.PERMISSION_GRANTED) {
        permissionsList.add(Manifest.permission.CHANGE_WIFI_STATE);
    }

    if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        permissionsList.add(Manifest.permission.ACCESS_COARSE_LOCATION);
    }

    if (permissionsList.size() > 0) {
        ActivityCompat.requestPermissions(this, permissionsList.toArray(new String[permissionsList.size()]),
                1);
        return false;
    }
    return true;
}

@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions,
                                       int[] grantResults) {
    switch (requestCode) {
        case 1:
            (new WifiFunction()).startScan(this);
            break;
    }
}

这应该工作。尝试了完整的代码。

在后来的Android版本中，你必须启用GPS。我通常会关闭我的GPS，希望能防止无良应用程序的跟踪。只有当我在移动的手机上打开GPS时，类似于上面的代码才对我有用。