Add copy Session ID button for one-to-one chats

res/menu/conversation_copy_session_id.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <item android:title="@string/activity_conversation_menu_copy_session_id"
+        android:id="@+id/menu_copy_session_id"
+        android:icon="@drawable/ic_content_copy_white_24dp" />
+
+</menu>

res/values/strings.xml

@@ -1855,4 +1855,6 @@
 
     <string name="view_reset_secure_session_done_message">Secure session reset done</string>
 
+    <string name="activity_conversation_menu_copy_session_id">Copy Session ID</string>
+
 </resources>

src/org/thoughtcrime/securesms/conversation/ConversationActivity.java

@@ -22,6 +22,8 @@ import android.annotation.TargetApi;
 import androidx.lifecycle.ViewModelProviders;
 import android.content.ActivityNotFoundException;
 import android.content.BroadcastReceiver;
+import android.content.ClipData;
+import android.content.ClipboardManager;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
@@ -760,6 +762,7 @@ public class ConversationActivity extends PassphraseRequiredActionBarActivity
       } else {
         inflater.inflate(R.menu.conversation_block, menu);
       }
+      inflater.inflate(R.menu.conversation_copy_session_id, menu);
     } else if (isGroupConversation() && !isOpenGroupOrRSSFeed) {
 //      inflater.inflate(R.menu.conversation_group_options, menu);
 
@@ -867,6 +870,7 @@ public class ConversationActivity extends PassphraseRequiredActionBarActivity
     case R.id.menu_call_insecure:             handleDial(getRecipient(), false);        return true;
     case R.id.menu_unblock:                   handleUnblock();                                   return true;
     case R.id.menu_block:                     handleBlock();                                     return true;
+    case R.id.menu_copy_session_id:           handleCopySessionID();                             return true;
     case R.id.menu_view_media:                handleViewMedia();                                 return true;
     case R.id.menu_add_shortcut:              handleAddShortcut();                               return true;
     case R.id.menu_search:                    handleSearch();                                    return true;
@@ -1096,6 +1100,15 @@ public class ConversationActivity extends PassphraseRequiredActionBarActivity
             }).show();
   }
 
+  private void handleCopySessionID() {
+    if (recipient.isGroupRecipient()) { return; }
+    String sessionID = recipient.getAddress().toPhoneString();
+    ClipboardManager clipboard = (ClipboardManager)getSystemService(Context.CLIPBOARD_SERVICE);
+    ClipData clip = ClipData.newPlainText("Session ID", sessionID);
+    clipboard.setPrimaryClip(clip);
+    Toast.makeText(this, R.string.copied_to_clipboard, Toast.LENGTH_SHORT).show();
+  }
+
   private void handleViewMedia() {
     Intent intent = new Intent(this, MediaOverviewActivity.class);
     intent.putExtra(MediaOverviewActivity.ADDRESS_EXTRA, recipient.getAddress());