【发布时间】：2019-03-11 07:14:01
【问题描述】：
对不起我的英语。 我正在编写代码以连接到另一个 android 设备热点。它得到连接。但是，就我而言，热点将没有互联网。现在连接的设备，切换回另一个有互联网的 wifi 网络。 除了我的方式之外，还有什么更好的方式来连接热点吗？ 我的代码如下：
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.layout);
AppCompatButton btnConnect=findViewById(R.id.btnConnect);
btnConnect.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
registerReceiver(mWifiBroadcastReceiver , new IntentFilter("android.net.wifi.STATE_CHANGE"));
EditText eSSID=findViewById(R.id.ssid);
EditText ePassword=findViewById(R.id.password);
String ssid = eSSID.getText().toString();
String key = ePassword.getText().toString();
WifiConfiguration wifiConfig = new WifiConfiguration();
wifiConfig.SSID = String.format("\"%s\"" , ssid);
wifiConfig.preSharedKey = String.format("\"%s\"" , key);
connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
wifiManager = (WifiManager) getApplicationContext().getSystemService(WIFI_SERVICE);
int netId = wifiManager.addNetwork(wifiConfig);
wifiManager.disconnect();
wifiManager.enableNetwork(netId , true);
wifiManager.reconnect();
}
});
}
接收者是：
private BroadcastReceiver mWifiBroadcastReceiver = new BroadcastReceiver() {
@Override
public void onReceive(final Context context , Intent intent) {
switch (intent.getAction()) {
case WifiManager.NETWORK_STATE_CHANGED_ACTION:
NetworkInfo info = intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);
boolean isConnected = info.isConnected();
boolean isConnecting = info.isConnectedOrConnecting();
//TODO: probably better to use the EXTRA_ info here
String ssid = wifiManager.getConnectionInfo() != null ?
wifiManager.getConnectionInfo().getSSID() : null;
ssid = normalizeAndroidWifiSsid(ssid);
String stateName = "";
switch (info.getState()) {
case CONNECTED:
stateName = "connected";
break;
case CONNECTING:
stateName = "connecting";
break;
case DISCONNECTED:
stateName = "disconnected";
break;
case DISCONNECTING:
stateName = "disconnecting";
break;
case SUSPENDED:
stateName = "suspended";
break;
case UNKNOWN:
stateName = "unknown";
break;
}
if (Build.VERSION.SDK_INT >= 21) {
if (isConnected) {
NetworkRequest.Builder builder = new NetworkRequest.Builder();
builder.addTransportType(NetworkCapabilities.TRANSPORT_WIFI);
builder.addCapability(NetworkCapabilities.NET_CAPABILITY_CAPTIVE_PORTAL);
final String connectedSsid = ssid;
connectivityManager.registerNetworkCallback(builder.build() , new ConnectivityManager.NetworkCallback() {
@Override
public void onAvailable(Network network) {
super.onAvailable(network);
NetworkInfo networkInfo = connectivityManager.getNetworkInfo(network);
//This is always the SSID if it's wifi, even though this is *not* documented
String networkSsid = networkInfo.getExtraInfo();
if (networkSsid.equals(connectedSsid)) {
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(context,"Connected Successfully",Toast
.LENGTH_LONG).show();
}
});
/*
* We can now use network.openURLConnection and network.getSocketFactory()
* to communicate using the wifi network that has no Internet
*/
connectivityManager.unregisterNetworkCallback(this);
}
}
});
}
}
break;
}
}
};
【问题讨论】：
-
你以后如何使用你的网络连接？您是否正在使用一些需要互联网访问的 API？你见过这个note吗？此外，此网络切换是立即发生还是在一段时间后发生？如果是后者，我们谈论的时间是多少？
-
@JakubPiskorz 切换发生在 4-5 秒内，有时更短。如果已知网络没有互联网，则会特别发生这种情况。对于未知网络 wifi 连接并弹出显示“wifi 无法访问互联网”，那很好.. 至少发生连接。但我担心的是没有互联网的已知网络。
标签： android