如何在 Android 中制作自定义页面以连接到 Wi-Fi？

Question

我是 android 新手，我正在为 Android TV 开发单模式应用程序。 我的目标 SDK 是 30。我正在尝试创建一个自定义页面来获取所有 wifi 的列表并连接到 wifi。 有没有这样做的例子？ 因为我看到的要么是使用 android wifi 意图，要么是当我试图从以下代码中扫描列表时。 即使我分配了所有权限，它也不会运行。

但是，如果有人可以提供用于创建自定义页面以连接到 wifi 的代码，那将非常有帮助。

public class WifiActivity extends AppCompatActivity {

/*    private ListView wifiList;
private WifiManager wifiManager;
private final int MY_PERMISSIONS_ACCESS_COARSE_LOCATION = 1;
WifiChangeBroadcastReceiver receiverWifi;
@Override

private ListView wifiList;
private WifiManager wifiManager;
private final int MY_PERMISSIONS_ACCESS_COARSE_LOCATION = 1;
WifiChangeBroadcastReceiver receiverWifi;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_wifi);
    wifiList = findViewById(R.id.wifiList);
    Button buttonScan = (Button) findViewById(R.id.scanBtn);
    wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
    if (!wifiManager.isWifiEnabled()) {
        Toast.makeText(getApplicationContext(), "Turning WiFi ON...", Toast.LENGTH_LONG).show();
        wifiManager.setWifiEnabled(true);
    }
    buttonScan.setOnClickListener(v -> {
        if (ActivityCompat.checkSelfPermission(WifiActivity.this, Manifest.permission.ACCESS_COARSE_LOCATION)
        != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(
                    WifiActivity.this, new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, MY_PERMISSIONS_ACCESS_COARSE_LOCATION);
        } else {

            wifiManager.startScan();
        }
    });
}
@Override
protected void onPostResume() {
    super.onPostResume();
    receiverWifi = new WifiChangeBroadcastReceiver(wifiManager, wifiList);
    IntentFilter intentFilter = new IntentFilter();
    intentFilter.addAction(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION);
    registerReceiver(receiverWifi, intentFilter);
    getWifi();
}
private void getWifi() {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        Toast.makeText(this, "version> = marshmallow", Toast.LENGTH_SHORT).show();
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            Toast.makeText(this, "location turned off", Toast.LENGTH_SHORT).show();
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, MY_PERMISSIONS_ACCESS_COARSE_LOCATION);
        } else {
            Toast.makeText(this, "location turned on", Toast.LENGTH_SHORT).show();
            wifiManager.startScan();
        }
    } else {
        Toast.makeText(this, "scanning", Toast.LENGTH_SHORT).show();
        wifiManager.startScan();
    }
}
@Override
protected void onPause() {
    super.onPause();
    unregisterReceiver(receiverWifi);
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    switch (requestCode) {
        case MY_PERMISSIONS_ACCESS_COARSE_LOCATION:
            if (grantResults.length >0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            Toast.makeText(this, "permission granted", Toast.LENGTH_SHORT).show();
            wifiManager.startScan();
        } else {
            Toast.makeText(this, "permission not granted", Toast.LENGTH_SHORT).show();
            return;
        }
        break;
    }
}
}

Answer 1

我做了一些研究并解决了这个问题。 如果有人需要帮助，这是解决方案。 在 android 10+ (SDK 29+) 中，您可以使用 WifiNetworkSpecifier 连接到互联网。

                                    WifiNetworkSpecifier.Builder builder = null;
                                    WifiNetworkSpecifier wifiNetworkSpecifier = null;
                                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
                                        builder = new WifiNetworkSpecifier.Builder();

                                        builder.setSsid(networkSSID);

                                        builder.setWpa2Passphrase(networkPass);
                                        wifiNetworkSpecifier = builder.build();

                                        NetworkRequest.Builder networkRequestBuilder = new NetworkRequest.Builder();
                                        networkRequestBuilder.addTransportType(NetworkCapabilities.TRANSPORT_WIFI);
                                        networkRequestBuilder.addCapability(NetworkCapabilities.NET_CAPABILITY_NOT_RESTRICTED);
                                        networkRequestBuilder.addCapability(NetworkCapabilities.NET_CAPABILITY_TRUSTED);
                                        networkRequestBuilder.setNetworkSpecifier(wifiNetworkSpecifier);
                                        NetworkRequest networkRequest = networkRequestBuilder.build();
                                        ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
                                        if (cm != null) {

                                            cm.requestNetwork(networkRequest, new ConnectivityManager.NetworkCallback() {
                                                @Override
                                                public void onAvailable(@NonNull Network network) {

                                                    super.onAvailable(network);
                                                }
                                            });
                                        }
                                    }