Don't start lazy mode if there is no posts. Stop lazy mode when refreshing.

app/src/main/java/ml/docilealligator/infinityforreddit/AccountPostsActivity.java

@@ -240,12 +240,13 @@ public class AccountPostsActivity extends AppCompatActivity implements UserThing
                     params.setScrollFlags(AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL | AppBarLayout.LayoutParams.SCROLL_FLAG_ENTER_ALWAYS);
                     collapsingToolbarLayout.setLayoutParams(params);
                 } else {
-                    ((FragmentCommunicator) mFragment).startLazyMode();
+                    if(((FragmentCommunicator) mFragment).startLazyMode()) {
                         isInLazyMode = true;
                         lazyModeItem.setTitle(R.string.action_stop_lazy_mode);
                         params.setScrollFlags(AppBarLayout.LayoutParams.SCROLL_FLAG_NO_SCROLL);
                         collapsingToolbarLayout.setLayoutParams(params);
                     }
+                }
                 return true;
             case android.R.id.home:
                 finish();

app/src/main/java/ml/docilealligator/infinityforreddit/FragmentCommunicator.java

@@ -3,7 +3,9 @@ package ml.docilealligator.infinityforreddit;
 interface FragmentCommunicator {
     void refresh();
     default void changeNSFW(boolean nsfw) {};
-    default void startLazyMode() {}
+    default boolean startLazyMode() {
+        return false;
+    }
     default void stopLazyMode() {}
     default void resumeLazyMode(boolean resumeNow) {}
     default void pauseLazyMode(boolean startTimer) {}

app/src/main/java/ml/docilealligator/infinityforreddit/MainActivity.java

@@ -719,12 +719,13 @@ public class MainActivity extends AppCompatActivity implements SortTypeBottomShe
                     params.setScrollFlags(AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL | AppBarLayout.LayoutParams.SCROLL_FLAG_ENTER_ALWAYS);
                     collapsingToolbarLayout.setLayoutParams(params);
                 } else {
-                    sectionsPagerAdapter.startLazyMode();
+                    if(sectionsPagerAdapter.startLazyMode()) {
                         isInLazyMode = true;
                         lazyModeItem.setTitle(R.string.action_stop_lazy_mode);
                         params.setScrollFlags(AppBarLayout.LayoutParams.SCROLL_FLAG_NO_SCROLL);
                         collapsingToolbarLayout.setLayoutParams(params);
                     }
+                }
                 return true;
         }
         return false;
@@ -935,17 +936,17 @@ public class MainActivity extends AppCompatActivity implements SortTypeBottomShe
             return fragment;
         }
 
-        void startLazyMode() {
+        boolean startLazyMode() {
             switch (viewPager.getCurrentItem()) {
                 case 0:
-                    ((FragmentCommunicator) frontPagePostFragment).startLazyMode();
+                    return ((FragmentCommunicator) frontPagePostFragment).startLazyMode();
-                    break;
                 case 1:
-                    ((FragmentCommunicator) popularPostFragment).startLazyMode();
+                    return ((FragmentCommunicator) popularPostFragment).startLazyMode();
-                    break;
                 case 2:
-                    ((FragmentCommunicator) allPostFragment).startLazyMode();
+                    return ((FragmentCommunicator) allPostFragment).startLazyMode();
             }
+
+            return false;
         }
 
         void stopLazyMode() {

app/src/main/java/ml/docilealligator/infinityforreddit/PostFragment.java

@@ -75,6 +75,7 @@ public class PostFragment extends Fragment implements FragmentCommunicator {
 
     private boolean isInLazyMode = false;
     private boolean isLazyModePaused = false;
+    private boolean hasPost = false;
 
     private PostRecyclerViewAdapter mAdapter;
     private RecyclerView.SmoothScroller smoothScroller;
@@ -367,16 +368,19 @@ public class PostFragment extends Fragment implements FragmentCommunicator {
         });
 
         mPostViewModel.hasPost().observe(this, hasPost -> {
+            this.hasPost = hasPost;
             if(hasPost) {
                 mFetchPostInfoLinearLayout.setVisibility(View.GONE);
             } else {
+                if(isInLazyMode) {
+                    stopLazyMode();
+                }
+
                 showErrorView(R.string.no_posts);
             }
         });
 
-        mPostViewModel.getPaginationNetworkState().observe(this, networkState -> {
+        mPostViewModel.getPaginationNetworkState().observe(this, networkState -> mAdapter.setNetworkState(networkState));
-            mAdapter.setNetworkState(networkState);
-        });
 
         return rootView;
     }
@@ -399,6 +403,9 @@ public class PostFragment extends Fragment implements FragmentCommunicator {
 
     @Override
     public void refresh() {
+        if(isInLazyMode) {
+            stopLazyMode();
+        }
         mPostViewModel.refresh();
     }
 
@@ -417,7 +424,12 @@ public class PostFragment extends Fragment implements FragmentCommunicator {
     }
 
     @Override
-    public void startLazyMode() {
+    public boolean startLazyMode() {
+        if(!hasPost) {
+            Toast.makeText(activity, R.string.no_posts_no_lazy_mode, Toast.LENGTH_SHORT).show();
+            return false;
+        }
+
         isInLazyMode = true;
         isLazyModePaused = false;
 
@@ -426,6 +438,8 @@ public class PostFragment extends Fragment implements FragmentCommunicator {
         window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
         Toast.makeText(activity, getString(R.string.lazy_mode_start, lazyModeInterval),
                 Toast.LENGTH_SHORT).show();
+
+        return true;
     }
 
     @Override

app/src/main/java/ml/docilealligator/infinityforreddit/ViewSubredditDetailActivity.java

@@ -493,11 +493,14 @@ public class ViewSubredditDetailActivity extends AppCompatActivity implements So
                     collapsingToolbarLayout.setLayoutParams(params);
                 } else {
                     isInLazyMode = true;
-                    ((FragmentCommunicator) mFragment).startLazyMode();
+                    if(((FragmentCommunicator) mFragment).startLazyMode()) {
                         lazyModeItem.setTitle(R.string.action_stop_lazy_mode);
                         appBarLayout.setExpanded(false);
                         params.setScrollFlags(AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL | AppBarLayout.LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED);
                         collapsingToolbarLayout.setLayoutParams(params);
+                    } else {
+                        isInLazyMode = false;
+                    }
                 }
         }
         return false;

app/src/main/java/ml/docilealligator/infinityforreddit/ViewUserDetailActivity.java

@@ -546,11 +546,14 @@ public class ViewUserDetailActivity extends AppCompatActivity implements UserThi
                     collapsingToolbarLayout.setLayoutParams(params);
                 } else {
                     isInLazyMode = true;
-                    sectionsPagerAdapter.startLazyMode();
+                    if(sectionsPagerAdapter.startLazyMode()) {
                         lazyModeItem.setTitle(R.string.action_stop_lazy_mode);
                         appBarLayout.setExpanded(false);
                         params.setScrollFlags(AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL | AppBarLayout.LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED);
                         collapsingToolbarLayout.setLayoutParams(params);
+                    } else {
+                        isInLazyMode = false;
+                    }
                 }
                 return true;
         }
@@ -708,10 +711,11 @@ public class ViewUserDetailActivity extends AppCompatActivity implements UserThi
             }
         }
 
-        void startLazyMode() {
+        boolean startLazyMode() {
             if(postFragment != null) {
-                ((FragmentCommunicator) postFragment).startLazyMode();
+                return ((FragmentCommunicator) postFragment).startLazyMode();
             }
+            return false;
         }
 
         void stopLazyMode() {

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

@@ -102,6 +102,7 @@
     <string name="app_label">Infinity</string>
     <string name="search_hint">Search anything</string>
 
+    <string name="no_posts_no_lazy_mode">No posts available</string>
     <string name="lazy_mode_start">Lazy Mode starts in %1$.1fs</string>
     <string name="lazy_mode_stop">Lazy Mode stopped</string>