Stop users adding friends when not connected to the Tox network

app/src/main/java/im/tox/antox/activities/AddFriendActivity.java

@@ -1,6 +1,8 @@
 package im.tox.antox.activities;
 
+import android.app.AlertDialog;
 import android.content.Context;
+import android.content.DialogInterface;
 import android.content.Intent;
 import android.net.Uri;
 import android.os.AsyncTask;
@@ -32,6 +34,7 @@
 import im.tox.antox.utils.Constants;
 import im.tox.antox.R;
 import im.tox.antox.tox.ToxService;
+import im.tox.antox.utils.DhtNode;
 
 /**
  * Activity to allow the user to add a friend. Also as a URI handler to automatically insert public
@@ -70,6 +73,19 @@ public void onCreate(Bundle savedInstanceState) {
             getSupportActionBar().setIcon(R.drawable.ic_actionbar);
         }
 
+        // Check to see if user is connected to dht first
+        if(!DhtNode.connected) {
+            AlertDialog alertDialog = new AlertDialog.Builder(this).create();
+            alertDialog.setTitle(R.string.addfriend_no_internet);
+            alertDialog.setMessage(getString(R.string.addfriend_no_internet_text));
+            alertDialog.setIcon(R.drawable.ic_launcher);
+            alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
+                public void onClick(DialogInterface dialog, int which) {
+                    finish();
+                }
+            });
+            alertDialog.show();
+        }
 
         Intent intent = getIntent();
         //If coming from tox uri link

app/src/main/res/values/strings.xml

@@ -31,7 +31,10 @@
     <string name="main_friend_requests">Friend Requests</string>
     <string name="main_friends">Friends</string>
     <string name="main_no_internet">No Internet Connection</string>
-    <string name="main_not_connected">You are not connected to the Internet</string>
+    <string name="main_not_connected">
+        No internet connection has been detected. Without an internet connection, you will have
+        limited functionality.
+    </string>
     <string name="main_node_list_download_error">Error Downloading Nodes List</string>
 
     <!-- About Activity -->
@@ -83,6 +86,11 @@
     <string name="addfriend_optional_title">Optional Extras</string>
     <string name="dialog_pin">Enter your friend\'s pin</string>
     <string name="addfriend_invalid_pin">Invalid Pin</string>
+    <string name="addfriend_no_internet">No Tox network connection</string>
+    <string name="addfriend_no_internet_text">
+        Unfortunately you aren\'t connected to the Tox network so you cannot add a friend right now.
+        Try restarting the application.
+    </string>
 
     <!--  Profile Activity -->
     <string name="share_with">Share With</string>