Adds missing content descriptions and fixes a bit of the follow button hiding code.

app/src/main/java/com/keylesspalace/tusky/MainActivity.java

@@ -78,7 +78,7 @@ public class MainActivity extends BaseActivity {
     @BindView(R.id.tab_layout) TabLayout tabLayout;
     @BindView(R.id.pager) ViewPager viewPager;
 
-    static FloatingActionButton composeBtn;
+    FloatingActionButton composeButton;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -112,13 +112,6 @@ public class MainActivity extends BaseActivity {
 
         // Setup the tabs and timeline pager.
         TimelinePagerAdapter adapter = new TimelinePagerAdapter(getSupportFragmentManager());
-        String[] pageTitles = {
-                getString(R.string.title_home),
-                getString(R.string.title_notifications),
-                getString(R.string.title_public_local),
-                getString(R.string.title_public_federated),
-        };
-        adapter.setPageTitles(pageTitles);
 
         int pageMargin = getResources().getDimensionPixelSize(R.dimen.tab_page_margin);
         viewPager.setPageMargin(pageMargin);
@@ -129,10 +122,23 @@ public class MainActivity extends BaseActivity {
 
         tabLayout.setupWithViewPager(viewPager);
 
-        tabLayout.getTabAt(0).setIcon(R.drawable.ic_home_24dp);
-        tabLayout.getTabAt(1).setIcon(R.drawable.ic_notifications_24dp);
-        tabLayout.getTabAt(2).setIcon(R.drawable.ic_local_24dp);
-        tabLayout.getTabAt(3).setIcon(R.drawable.ic_public_24dp);
+        int[] tabIcons = {
+                R.drawable.ic_home_24dp,
+                R.drawable.ic_notifications_24dp,
+                R.drawable.ic_local_24dp,
+                R.drawable.ic_public_24dp,
+        };
+        String[] pageTitles = {
+                getString(R.string.title_home),
+                getString(R.string.title_notifications),
+                getString(R.string.title_public_local),
+                getString(R.string.title_public_federated),
+        };
+        for (int i = 0; i < 4; i++) {
+            TabLayout.Tab tab = tabLayout.getTabAt(i);
+            tab.setIcon(tabIcons[i]);
+            tab.setContentDescription(pageTitles[i]);
+        }
 
         tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
             @Override
@@ -180,7 +186,7 @@ public class MainActivity extends BaseActivity {
         // Setup push notifications
         if (arePushNotificationsEnabled()) enablePushNotifications();
 
-        composeBtn = floatingBtn;
+        composeButton = floatingBtn;
     }
 
     @Override

app/src/main/java/com/keylesspalace/tusky/StatusViewHolder.java

@@ -16,7 +16,6 @@
 package com.keylesspalace.tusky;
 
 import android.content.Context;
-import android.content.SharedPreferences;
 import android.preference.PreferenceManager;
 import android.support.annotation.Nullable;
 import android.support.v7.widget.RecyclerView;

app/src/main/java/com/keylesspalace/tusky/TimelineFragment.java

@@ -57,6 +57,7 @@ public class TimelineFragment extends SFragment implements
     private TimelineAdapter adapter;
     private Kind kind;
     private String hashtagOrId;
+    private RecyclerView recyclerView;
     private LinearLayoutManager layoutManager;
     private EndlessOnScrollListener scrollListener;
     private TabLayout.OnTabSelectedListener onTabSelectedListener;
@@ -95,7 +96,7 @@ public class TimelineFragment extends SFragment implements
         swipeRefreshLayout = (SwipeRefreshLayout) rootView.findViewById(R.id.swipe_refresh_layout);
         swipeRefreshLayout.setOnRefreshListener(this);
         // Setup the RecyclerView.
-        RecyclerView recyclerView = (RecyclerView) rootView.findViewById(R.id.recycler_view);
+        recyclerView = (RecyclerView) rootView.findViewById(R.id.recycler_view);
         recyclerView.setHasFixedSize(true);
         layoutManager = new LinearLayoutManager(context);
         recyclerView.setLayoutManager(layoutManager);
@@ -105,33 +106,6 @@ public class TimelineFragment extends SFragment implements
                 R.drawable.status_divider_dark);
         divider.setDrawable(drawable);
         recyclerView.addItemDecoration(divider);
-        scrollListener = new EndlessOnScrollListener(layoutManager) {
-            @Override
-            public void onScrolled(RecyclerView view, int dx, int dy) {
-                super.onScrolled(view, dx, dy);
-
-                SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
-
-                if (dy > 0 && prefs.getBoolean("fabHide", false) && MainActivity.composeBtn.isShown()) {
-                    MainActivity.composeBtn.hide(); // hides the button if we're scrolling down
-                } else if (dy < 0 && prefs.getBoolean("fabHide", false) && !MainActivity.composeBtn.isShown()) {
-                    MainActivity.composeBtn.show(); // shows it if we are scrolling up
-                }
-
-            }
-
-            @Override
-            public void onLoadMore(int page, int totalItemsCount, RecyclerView view) {
-                TimelineAdapter adapter = (TimelineAdapter) view.getAdapter();
-                Status status = adapter.getItem(adapter.getItemCount() - 2);
-                if (status != null) {
-                    sendFetchTimelineRequest(status.id, null);
-                } else {
-                    sendFetchTimelineRequest();
-                }
-            }
-        };
-        recyclerView.addOnScrollListener(scrollListener);
         adapter = new TimelineAdapter(this);
         recyclerView.setAdapter(adapter);
 
@@ -155,6 +129,60 @@ public class TimelineFragment extends SFragment implements
         return rootView;
     }
 
+    private void onLoadMore(RecyclerView view) {
+        TimelineAdapter adapter = (TimelineAdapter) view.getAdapter();
+        Status status = adapter.getItem(adapter.getItemCount() - 2);
+        if (status != null) {
+            sendFetchTimelineRequest(status.id, null);
+        } else {
+            sendFetchTimelineRequest();
+        }
+    }
+
+    @Override
+    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
+        super.onActivityCreated(savedInstanceState);
+
+        /* This is delayed until onActivityCreated solely because MainActivity.composeButton isn't
+         * guaranteed to be set until then. */
+        if (followButtonPresent()) {
+            /* Use a modified scroll listener that both loads more statuses as it goes, and hides
+             * the follow button on down-scroll. */
+            MainActivity activity = (MainActivity) getActivity();
+            final FloatingActionButton composeButton = activity.composeButton;
+            final SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(
+                    activity);
+            scrollListener = new EndlessOnScrollListener(layoutManager) {
+                @Override
+                public void onScrolled(RecyclerView view, int dx, int dy) {
+                    super.onScrolled(view, dx, dy);
+
+                    if (preferences.getBoolean("fabHide", false)) {
+                        if (dy > 0 && composeButton.isShown()) {
+                            composeButton.hide(); // hides the button if we're scrolling down
+                        } else if (dy < 0 && !composeButton.isShown()) {
+                            composeButton.show(); // shows it if we are scrolling up
+                        }
+                    }
+                }
+
+                @Override
+                public void onLoadMore(int page, int totalItemsCount, RecyclerView view) {
+                    TimelineFragment.this.onLoadMore(view);
+                }
+            };
+        } else {
+            // Just use the basic scroll listener to load more statuses.
+            scrollListener = new EndlessOnScrollListener(layoutManager) {
+                @Override
+                public void onLoadMore(int page, int totalItemsCount, RecyclerView view) {
+                    TimelineFragment.this.onLoadMore(view);
+                }
+            };
+        }
+        recyclerView.addOnScrollListener(scrollListener);
+    }
+
     @Override
     public void onDestroy() {
         super.onDestroy();
@@ -174,6 +202,10 @@ public class TimelineFragment extends SFragment implements
         return kind != Kind.TAG && kind != Kind.FAVOURITES;
     }
 
+    private boolean followButtonPresent() {
+        return kind != Kind.TAG && kind != Kind.FAVOURITES;
+    }
+
     private void jumpToTop() {
         layoutManager.scrollToPosition(0);
         scrollListener.reset();

app/src/main/java/com/keylesspalace/tusky/TimelinePagerAdapter.java

@@ -20,16 +20,10 @@ import android.support.v4.app.FragmentManager;
 import android.support.v4.app.FragmentPagerAdapter;
 
 class TimelinePagerAdapter extends FragmentPagerAdapter {
-    private String[] pageTitles;
-
     TimelinePagerAdapter(FragmentManager manager) {
         super(manager);
     }
 
-    void setPageTitles(String[] titles) {
-        pageTitles = titles;
-    }
-
     @Override
     public Fragment getItem(int i) {
         switch (i) {

app/src/main/res/layout/item_status.xml

@@ -5,7 +5,8 @@
     android:layout_height="wrap_content"
     android:paddingLeft="16dp"
     android:paddingRight="16dp"
-    android:id="@+id/status_container">
+    android:id="@+id/status_container"
+    android:contentDescription="@string/action_view_thread">
 
     <RelativeLayout
         android:layout_width="match_parent"
@@ -43,7 +44,7 @@
         android:layout_below="@+id/status_reblogged_bar"
         android:layout_marginTop="11dp"
         android:layout_marginRight="10dp"
-        android:contentDescription="@null" />
+        android:contentDescription="@string/action_view_profile" />
 
     <RelativeLayout
         android:layout_height="wrap_content"

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

@@ -72,6 +72,7 @@
     <string name="action_view_preferences">Preferences</string>
     <string name="action_view_favourites">Favourites</string>
     <string name="action_view_blocks">Blocked users</string>
+    <string name="action_view_thread">View thread</string>
     <string name="action_open_in_web">Open in browser</string>
     <string name="action_submit">Submit</string>
     <string name="action_photo_pick">Add media</string>

app/src/main/res/xml/preferences.xml

@@ -18,7 +18,7 @@
     <PreferenceCategory android:title="@string/pref_title_browser_settings">
         <CheckBoxPreference
             android:key="customTabs"
-            android:title="@string/pre_title_custom_tabs"
+            android:title="@string/pref_title_custom_tabs"
             android:defaultValue="true" />
     </PreferenceCategory>
     <PreferenceCategory android:title="@string/pref_title_notification_settings">