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      1 /*
      2  * Copyright (C) 2012 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.example.android.nsdchat;
     18 
     19 import android.app.Activity;
     20 import android.net.nsd.NsdServiceInfo;
     21 import android.os.Bundle;
     22 import android.os.Handler;
     23 import android.os.Message;
     24 import android.util.Log;
     25 import android.view.View;
     26 import android.widget.EditText;
     27 import android.widget.TextView;
     28 
     29 import com.example.android.nsdchat.NsdHelper;
     30 
     31 public class NsdChatActivity extends Activity {
     32 
     33     NsdHelper mNsdHelper;
     34 
     35     private TextView mStatusView;
     36     private Handler mUpdateHandler;
     37 
     38     public static final String TAG = "NsdChat";
     39 
     40     ChatConnection mConnection;
     41 
     42     /** Called when the activity is first created. */
     43     @Override
     44     public void onCreate(Bundle savedInstanceState) {
     45         super.onCreate(savedInstanceState);
     46         Log.d(TAG, "Creating chat activity");
     47         setContentView(R.layout.main);
     48         mStatusView = (TextView) findViewById(R.id.status);
     49 
     50         mUpdateHandler = new Handler() {
     51                 @Override
     52             public void handleMessage(Message msg) {
     53                 String chatLine = msg.getData().getString("msg");
     54                 addChatLine(chatLine);
     55             }
     56         };
     57 
     58     }
     59 
     60     public void clickAdvertise(View v) {
     61         // Register service
     62         if(mConnection.getLocalPort() > -1) {
     63             mNsdHelper.registerService(mConnection.getLocalPort());
     64         } else {
     65             Log.d(TAG, "ServerSocket isn't bound.");
     66         }
     67     }
     68 
     69     public void clickDiscover(View v) {
     70         mNsdHelper.discoverServices();
     71     }
     72 
     73     public void clickConnect(View v) {
     74         NsdServiceInfo service = mNsdHelper.getChosenServiceInfo();
     75         if (service != null) {
     76             Log.d(TAG, "Connecting.");
     77             mConnection.connectToServer(service.getHost(),
     78                     service.getPort());
     79         } else {
     80             Log.d(TAG, "No service to connect to!");
     81         }
     82     }
     83 
     84     public void clickSend(View v) {
     85         EditText messageView = (EditText) this.findViewById(R.id.chatInput);
     86         if (messageView != null) {
     87             String messageString = messageView.getText().toString();
     88             if (!messageString.isEmpty()) {
     89                 mConnection.sendMessage(messageString);
     90             }
     91             messageView.setText("");
     92         }
     93     }
     94 
     95     public void addChatLine(String line) {
     96         mStatusView.append("\n" + line);
     97     }
     98 
     99     @Override
    100     protected void onStart() {
    101         Log.d(TAG, "Starting.");
    102         mConnection = new ChatConnection(mUpdateHandler);
    103 
    104         mNsdHelper = new NsdHelper(this);
    105         mNsdHelper.initializeNsd();
    106         super.onStart();
    107     }
    108 
    109 
    110     @Override
    111     protected void onPause() {
    112         Log.d(TAG, "Pausing.");
    113         if (mNsdHelper != null) {
    114             mNsdHelper.stopDiscovery();
    115         }
    116         super.onPause();
    117     }
    118 
    119     @Override
    120     protected void onResume() {
    121         Log.d(TAG, "Resuming.");
    122         super.onResume();
    123         if (mNsdHelper != null) {
    124             mNsdHelper.discoverServices();
    125         }
    126     }
    127 
    128 
    129     // For KitKat and earlier releases, it is necessary to remove the
    130     // service registration when the application is stopped.  There's
    131     // no guarantee that the onDestroy() method will be called (we're
    132     // killable after onStop() returns) and the NSD service won't remove
    133     // the registration for us if we're killed.
    134 
    135     // In L and later, NsdService will automatically unregister us when
    136     // our connection goes away when we're killed, so this step is
    137     // optional (but recommended).
    138 
    139     @Override
    140     protected void onStop() {
    141         Log.d(TAG, "Being stopped.");
    142         mNsdHelper.tearDown();
    143         mConnection.tearDown();
    144         mNsdHelper = null;
    145         mConnection = null;
    146         super.onStop();
    147     }
    148 
    149     @Override
    150     protected void onDestroy() {
    151         Log.d(TAG, "Being destroyed.");
    152         super.onDestroy();
    153     }
    154 }
    155