我得到了一个AsyncTask,应该检查对主机名的网络访问。但是doInBackground()永远不会超时。有人知道吗?
public class HostAvailabilityTask extends AsyncTask<String, Void, Boolean> {
private Main main;
public HostAvailabilityTask(Main main) {
this.main = main;
}
protected Boolean doInBackground(String... params) {
Main.Log("doInBackground() isHostAvailable():"+params[0]);
try {
return InetAddress.getByName(params[0]).isReachable(30);
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return false;
}
protected void onPostExecute(Boolean... result) {
Main.Log("onPostExecute()");
if(result[0] == false) {
main.setContentView(R.layout.splash);
return;
}
main.continueAfterHostCheck();
}
}
不要检查WIFI连接或移动数据连接,试着点击任何托管域。以便您可以检查WIFI/Mobile连接是否具有连接公共互联网的能力。
如果您的移动设备能够连接到所提供的公共域,则将返回以下内容。
boolean isReachable()
{
boolean connected = false;
String instanceURL = "Your trusted domain name";
Socket socket;
try {
socket = new Socket();
SocketAddress socketAddress = new InetSocketAddress(instanceURL, 80);
socket.connect(socketAddress, 5000);
if (socket.isConnected()) {
connected = true;
socket.close();
}
} catch (IOException e) {
e.printStackTrace();
} finally {
socket = null;
}
return connected;
}
希望对大家有所帮助。
如果你需要检查网络连接,使用ping到服务器的方法:
public boolean checkIntCON() {
try {
Process ipProcess = Runtime.getRuntime().exec("/system/bin/ping -c 1 8.8.8.8");
return (ipProcess.waitFor() == 0);
}
catch (IOException e) { e.printStackTrace(); }
catch (InterruptedException e) { e.printStackTrace(); }
return false;
}
您可以使用端口进行检查
public boolean checkIntCON() {
try {
Socket sock = new Socket();
SocketAddress sockaddr = new InetSocketAddress("8.8.8.8", 80);
// port will change according to protocols
sock.connect(sockaddr, 1250);
sock.close();
return true;
} catch (IOException e) { return false; }
}