Show explanation about visibility in member lists

briar-android/src/main/java/org/briarproject/briar/android/privategroup/memberlist/GroupMemberListActivity.java

@@ -4,6 +4,7 @@ import android.content.Intent;
 import android.os.Bundle;
 import android.support.v7.widget.LinearLayoutManager;
 import android.view.MenuItem;
+import android.widget.TextView;
 
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
@@ -40,7 +41,7 @@ public class GroupMemberListActivity extends BriarActivity {
 	public void onCreate(@Nullable final Bundle state) {
 		super.onCreate(state);
 
-		setContentView(R.layout.list);
+		setContentView(R.layout.activity_sharing_status);
 
 		Intent i = getIntent();
 		byte[] b = i.getByteArrayExtra(GROUP_ID);
@@ -52,6 +53,9 @@ public class GroupMemberListActivity extends BriarActivity {
 		list.setLayoutManager(linearLayoutManager);
 		adapter = new MemberListAdapter(this);
 		list.setAdapter(adapter);
+
+		TextView info = (TextView) findViewById(R.id.info);
+		info.setText(R.string.sharing_status_groups);
 	}
 
 	@Override

briar-android/src/main/java/org/briarproject/briar/android/sharing/BlogSharingStatusActivity.java

@@ -5,6 +5,7 @@ import org.briarproject.bramble.api.db.DatabaseExecutor;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
+import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.api.blog.BlogSharingManager;
 
@@ -25,6 +26,11 @@ public class BlogSharingStatusActivity extends SharingStatusActivity {
 		component.inject(this);
 	}
 
+	@Override
+	int getInfoText() {
+		return R.string.sharing_status_blog;
+	}
+
 	@Override
 	@DatabaseExecutor
 	protected Collection<Contact> getSharedWith() throws DbException {

briar-android/src/main/java/org/briarproject/briar/android/sharing/ForumSharingStatusActivity.java

@@ -5,6 +5,7 @@ import org.briarproject.bramble.api.db.DatabaseExecutor;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
+import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.api.forum.ForumSharingManager;
 
@@ -25,6 +26,11 @@ public class ForumSharingStatusActivity extends SharingStatusActivity {
 		component.inject(this);
 	}
 
+	@Override
+	int getInfoText() {
+		return R.string.sharing_status_forum;
+	}
+
 	@Override
 	@DatabaseExecutor
 	protected Collection<Contact> getSharedWith() throws DbException {

briar-android/src/main/java/org/briarproject/briar/android/sharing/SharingStatusActivity.java

@@ -3,8 +3,10 @@ package org.briarproject.briar.android.sharing;
 import android.content.Intent;
 import android.os.Bundle;
 import android.support.annotation.Nullable;
+import android.support.annotation.StringRes;
 import android.support.v7.widget.LinearLayoutManager;
 import android.view.MenuItem;
+import android.widget.TextView;
 
 import org.briarproject.bramble.api.contact.Contact;
 import org.briarproject.bramble.api.db.DatabaseExecutor;
@@ -45,7 +47,7 @@ abstract class SharingStatusActivity extends BriarActivity {
 	public void onCreate(@Nullable Bundle savedInstanceState) {
 		super.onCreate(savedInstanceState);
 
-		setContentView(R.layout.list);
+		setContentView(R.layout.activity_sharing_status);
 
 		Intent i = getIntent();
 		byte[] b = i.getByteArrayExtra(GROUP_ID);
@@ -57,6 +59,9 @@ abstract class SharingStatusActivity extends BriarActivity {
 		list.setLayoutManager(new LinearLayoutManager(this));
 		list.setAdapter(adapter);
 		list.setEmptyText(getString(R.string.nobody));
+
+		TextView info = (TextView) findViewById(R.id.info);
+		info.setText(getInfoText());
 	}
 
 	@Override
@@ -84,6 +89,9 @@ abstract class SharingStatusActivity extends BriarActivity {
 		}
 	}
 
+	@StringRes
+	abstract int getInfoText();
+
 	@DatabaseExecutor
 	abstract protected Collection<Contact> getSharedWith() throws DbException;
 

briar-android/src/main/res/drawable/ic_info.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:alpha="0.56"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+	<path
+		android:fillColor="#000000"
+		android:pathData="M11,17h2v-6h-2v6zM12,2C6.48,2 2,6.48 2,12s4.48,10 10,10 10,-4.48 10,-10S17.52,2 12,2zM12,20c-4.41,0 -8,-3.59 -8,-8s3.59,-8 8,-8 8,3.59 8,8 -3.59,8 -8,8zM11,9h2L13,7h-2v2z"/>
+</vector>

briar-android/src/main/res/layout/activity_sharing_status.xml

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout
+	xmlns:android="http://schemas.android.com/apk/res/android"
+	xmlns:app="http://schemas.android.com/apk/res-auto"
+	xmlns:tools="http://schemas.android.com/tools"
+	android:layout_width="match_parent"
+	android:layout_height="match_parent"
+	android:orientation="vertical">
+
+	<TextView
+		android:id="@+id/info"
+		android:layout_width="match_parent"
+		android:layout_height="wrap_content"
+		android:drawableLeft="@drawable/ic_info"
+		android:drawablePadding="@dimen/margin_medium"
+		android:padding="@dimen/margin_medium"
+		android:textColor="?android:textColorSecondary"
+		android:textSize="@dimen/text_size_tiny"
+		tools:text="@string/sharing_status_forum"/>
+
+	<View style="@style/Divider.Horizontal"/>
+
+	<org.briarproject.briar.android.view.BriarRecyclerView
+		android:id="@+id/list"
+		android:layout_width="match_parent"
+		android:layout_height="match_parent"
+		app:scrollToEnd="false"
+		tools:listitem="@layout/list_item_contact"/>
+
+</LinearLayout>

briar-android/src/main/res/values/strings.xml

@@ -194,6 +194,7 @@
 	<string name="groups_invitations_response_declined_sent">You declined the group invitation from %s.</string>
 	<string name="groups_invitations_response_accepted_received">%s accepted the group invitation.</string>
 	<string name="groups_invitations_response_declined_received">%s declined the group invitation.</string>
+	<string name="sharing_status_groups">Only the creator can invite new members to the group. Below are all current members of the group.</string>
 
 	<!-- Private Groups Revealing Contacts -->
 	<string name="groups_reveal_contacts">Reveal Contacts</string>
@@ -252,6 +253,7 @@
 	<string name="forum_invitation_response_declined_received">%s declined the forum invitation.</string>
 
 	<string name="sharing_status">Sharing Status</string>
+	<string name="sharing_status_forum">Any member of a forum can share it with their contacts. You are sharing this forum with the following contacts. There may also be other members who you can\'t see.</string>
 	<string name="shared_with">Shared with %1$d (%2$d online)</string>
 	<plurals name="forums_shared">
 		<item quantity="one">%d forum shared by contacts</item>
@@ -291,6 +293,7 @@
 	<string name="blogs_sharing_invitations_title">Blog Invitations</string>
 	<string name="blogs_sharing_joined_toast">Subscribed to Blog</string>
 	<string name="blogs_sharing_declined_toast">Blog Invitation Declined</string>
+	<string name="sharing_status_blog">Anyone who subscribes to a blog can share it with their contacts. You are sharing this blog with the following contacts. There may also be other subscribers who you can\'t see.</string>
 
 	<!-- RSS Feeds -->
 	<string name="blogs_rss_feeds_import">Import RSS Feed</string>