NSD возвращает ноль при попытке получить хост - PullRequest
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NSD возвращает ноль при попытке получить хост

0 голосов
/ 25 января 2020

Я пытаюсь реализовать NSD, но не могу получить ip-адрес хоста на стороне сервера. Ip-адрес, так как я жарил его, он реальный, но всякий раз, когда я пытался получить его со стороны клиента, он возвращает null

Клиентская сторона 

package com.example.nsd_client_test;

import android.net.nsd.NsdManager;
import android.net.nsd.NsdServiceInfo;
import android.os.Bundle;
import android.view.View;
import android.widget.Adapter;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.net.Socket;
import java.util.Map;


import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity implements View.OnClickListener, Runnable {
    public static final String SERVICE_TYPE = "_http._tcp.";
    private Button mBtnScan;
    private Adapter adapter;
    private NsdManager.DiscoveryListener mDiscoveryListener;
    private Socket mSocket;
    private NsdManager nsdManager;
    private NsdManager.ResolveListener mResolverListener;
    private NsdServiceInfo mNsdServiceInfo;
    private BufferedWriter bufferedWriter;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        init();
        createDiscoverListener();
        createResolverListener();
    }
    private void init() {
        nsdManager = (NsdManager) getSystemService(NSD_SERVICE);
        mBtnScan =  findViewById(R.id.btn_Scan);
        mBtnScan.setOnClickListener(this);

    }


    @Override
    public void onClick(View view) {
        nsdManager.discoverServices(SERVICE_TYPE, NsdManager.PROTOCOL_DNS_SD, mDiscoveryListener);
    }

    private void createResolverListener() {
        mResolverListener = new NsdManager.ResolveListener() {
            @Override
            public void onResolveFailed(NsdServiceInfo nsdServiceInfo, int i) {
                Toast.makeText(MainActivity.this, "onResolveFailed", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onServiceResolved(NsdServiceInfo nsdServiceInfo) {
                mNsdServiceInfo = nsdServiceInfo;
                new Thread(MainActivity.this).start();
            }
        };
    }

    private void createDiscoverListener() {
        mDiscoveryListener = new NsdManager.DiscoveryListener() {
            @Override
            public void onStartDiscoveryFailed(String s, int i) {
                Toast.makeText(MainActivity.this, "onStartDiscoveryFailed", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onStopDiscoveryFailed(String s, int i) {
                Toast.makeText(MainActivity.this, "onStopDiscoveryFailed", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onDiscoveryStarted(String s) {
                Toast.makeText(MainActivity.this, "onDiscoveryStarted", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onDiscoveryStopped(String s) {
                Toast.makeText(MainActivity.this, "onDiscoveryStopped", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onServiceFound(final NsdServiceInfo nsdServiceInfo) {
              Toast.makeText(MainActivity.this, "Server Founded ", Toast.LENGTH_LONG).show();
                Toast.makeText(MainActivity.this, "Found"+nsdServiceInfo.getHost().getHostAddress(), Toast.LENGTH_LONG).show();


                // FoudHandler(Integer.valueOf(nsdServiceInfo.getPort()));

                runOnUiThread(new Runnable() {

                    @Override
                    public void run() {

                        TextView textView = findViewById(R.id.found_txt);
//                        textView.setText(nsdServiceInfo.getHost().toString());

                    }
                });


            }

            @Override
            public void onServiceLost(NsdServiceInfo nsdServiceInfo) {
                Toast.makeText(MainActivity.this, "onServiceLost", Toast.LENGTH_SHORT).show();
            }
        };
    }

    private void FoudHandler(Integer toString) {

        return;
    }


    @Override
    public void run() {
        try {

            mSocket = new Socket(mNsdServiceInfo.getHost().getHostAddress(), mNsdServiceInfo.getPort());
            bufferedWriter = new BufferedWriter(new OutputStreamWriter(mSocket.getOutputStream()));
            bufferedWriter.write("Connected to you!" + "\n");
            bufferedWriter.flush();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        nsdManager.stopServiceDiscovery(mDiscoveryListener);
    }


}

, где Серверная сторона 

package com.example.nsd_server_test;

import android.net.nsd.NsdManager;
import android.net.nsd.NsdServiceInfo;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.UnknownHostException;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity implements View.OnClickListener, Runnable {

    public static final String SERVICE_NAME = "TV Server";
    public static final String SERVICE_TYPE = "_http._tcp.";
    private Button mBtnRegister;
    private TextView mTvContent;
    private NsdServiceInfo mNsdServiceInfo;
    private ServerSocket mServerSocket;
    private int mPort;
    private NsdManager mNsdManager;
    private NsdManager.RegistrationListener mRegistrationListener;
    private String my_IP;
    String ip ;
    private Handler mHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            mTvContent.setText(mTvContent.getText() + (String) msg.obj);
        }
    };


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mTvContent = findViewById(R.id.list_text_view);
        mBtnRegister = findViewById(R.id.btn_Register);
        mBtnRegister.setOnClickListener(this);


//        getIphost b = new getIphost();
//        b.execute("hello");
//        my_IP=b.ip;

    }

    @Override
    public void onClick(View view) {
       // Toast.makeText(getApplicationContext(),ip.toString(),Toast.LENGTH_LONG).show();
        createServerSocket();
        try {
            createNsdServiceInfo();
        } catch (UnknownHostException e) {
            e.printStackTrace();
        }
        createRegistration();
        register();

    }

    private void register() {
        mNsdManager = (NsdManager) getSystemService(NSD_SERVICE);
        mNsdManager.registerService(mNsdServiceInfo, NsdManager.PROTOCOL_DNS_SD, mRegistrationListener);
    }

    private void createRegistration() {
        mRegistrationListener = new NsdManager.RegistrationListener() {
            @Override
            public void onRegistrationFailed(NsdServiceInfo nsdServiceInfo, int i) {
                Toast.makeText(MainActivity.this, "onRegistrationFailed", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onUnregistrationFailed(NsdServiceInfo nsdServiceInfo, int i) {
                Toast.makeText(MainActivity.this, "onUnregistrationFailed", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onServiceRegistered(NsdServiceInfo nsdServiceInfo) {
                Toast.makeText(MainActivity.this, "onServiceRegistered", Toast.LENGTH_SHORT).show();
                new Thread(MainActivity.this).start();
            }

            @Override
            public void onServiceUnregistered(NsdServiceInfo nsdServiceInfo) {
                Toast.makeText(MainActivity.this, "onServiceUnregistered", Toast.LENGTH_SHORT).show();
            }
        };
    }

    /**
    * Create the Server Socket
    * */
    private void createServerSocket() {
        if (mServerSocket != null) return;
        try {

            mServerSocket = new ServerSocket(0);// 0 will give us the free port
            mPort = mServerSocket.getLocalPort();
            WifiManager wm = (WifiManager) getApplicationContext().getSystemService(WIFI_SERVICE);
            int ips = wm.getConnectionInfo().getIpAddress();
            String ipString = String.format("%d.%d.%d.%d", (ips & 0xff), (ips >> 8 & 0xff), (ips >> 16 & 0xff), (ips >> 24 & 0xff));
            ip=ipString;

            Toast.makeText(getApplicationContext(),ip,Toast.LENGTH_LONG).show();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * set the info about the server created
     */
    private void createNsdServiceInfo() throws UnknownHostException {
        if (mNsdServiceInfo != null) return;
        mNsdServiceInfo = new NsdServiceInfo();
        mNsdServiceInfo.setServiceName(SERVICE_NAME);
        mNsdServiceInfo.setServiceType(SERVICE_TYPE);
        mNsdServiceInfo.setHost(InetAddress.getByName(ip));
        mNsdServiceInfo.setPort(mPort);
        Toast.makeText(getApplicationContext(),mNsdServiceInfo.getHost()+" sent!",Toast.LENGTH_LONG).show();
        Toast.makeText(getApplicationContext(),mNsdServiceInfo.getPort()+" sent!",Toast.LENGTH_LONG).show();

    }

    @Override
    public void run() {
        try {
            Socket socket = mServerSocket.accept();
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            String content = null;
            while ((content = bufferedReader.readLine()) != null) {
                Message msg = mHandler.obtainMessage();
                msg.obj = content;
                msg.what = 0;
                mHandler.sendMessageDelayed(msg,3000);
            }
            bufferedReader = null;
        } catch (IOException e) {
            e.printStackTrace();
        }
        }
    /**
     *  close the socket whenever the application distorted
     *
     * */
    @Override
    protected void onDestroy() {
        super.onDestroy();
        try {
            mServerSocket.close();
            mServerSocket = null;
        } catch (IOException e) {
            e.printStackTrace();
        }

        mNsdManager.unregisterService(mRegistrationListener);
    }

}

, где я передаю тост за отправленный IP, кажется правильным, но на стороне клиента возвращает ноль. Я проверил документацию Android, но не показывает, как решить эту проблему

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