Long press the toolbar to go to top.

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

@@ -25,6 +25,7 @@ import javax.inject.Named;
 
 import butterknife.BindView;
 import butterknife.ButterKnife;
+import ml.docilealligator.infinityforreddit.ActivityToolbarInterface;
 import ml.docilealligator.infinityforreddit.AsyncTask.GetCurrentAccountAsyncTask;
 import ml.docilealligator.infinityforreddit.CustomTheme.CustomThemeWrapper;
 import ml.docilealligator.infinityforreddit.Event.ChangeNSFWEvent;
@@ -40,7 +41,8 @@ import ml.docilealligator.infinityforreddit.SortType;
 import ml.docilealligator.infinityforreddit.SortTypeSelectionCallback;
 import ml.docilealligator.infinityforreddit.Utils.SharedPreferencesUtils;
 
-public class AccountPostsActivity extends BaseActivity implements SortTypeSelectionCallback, PostLayoutBottomSheetFragment.PostLayoutSelectionCallback {
+public class AccountPostsActivity extends BaseActivity implements SortTypeSelectionCallback,
+        PostLayoutBottomSheetFragment.PostLayoutSelectionCallback, ActivityToolbarInterface {
 
     static final String EXTRA_USER_WHERE = "EUW";
 
@@ -118,6 +120,7 @@ public class AccountPostsActivity extends BaseActivity implements SortTypeSelect
 
         setSupportActionBar(toolbar);
         getSupportActionBar().setDisplayHomeAsUpEnabled(true);
+        setToolbarGoToTop(toolbar);
 
         params = (AppBarLayout.LayoutParams) collapsingToolbarLayout.getLayoutParams();
 
@@ -288,4 +291,11 @@ public class AccountPostsActivity extends BaseActivity implements SortTypeSelect
             ((FragmentCommunicator) mFragment).changePostLayout(postLayout);
         }
     }
+
+    @Override
+    public void onLongPress() {
+        if (mFragment != null) {
+            ((PostFragment) mFragment).goBackToTop();
+        }
+    }
 }

app/src/main/java/ml/docilealligator/infinityforreddit/Activity/AccountSavedThingActivity.java

@@ -30,6 +30,7 @@ import javax.inject.Named;
 
 import butterknife.BindView;
 import butterknife.ButterKnife;
+import ml.docilealligator.infinityforreddit.ActivityToolbarInterface;
 import ml.docilealligator.infinityforreddit.AsyncTask.GetCurrentAccountAsyncTask;
 import ml.docilealligator.infinityforreddit.CustomTheme.CustomThemeWrapper;
 import ml.docilealligator.infinityforreddit.Event.ChangeNSFWEvent;
@@ -43,7 +44,7 @@ import ml.docilealligator.infinityforreddit.R;
 import ml.docilealligator.infinityforreddit.RedditDataRoomDatabase;
 import retrofit2.Retrofit;
 
-public class AccountSavedThingActivity extends BaseActivity {
+public class AccountSavedThingActivity extends BaseActivity implements ActivityToolbarInterface {
 
     private static final String NULL_ACCESS_TOKEN_STATE = "NATS";
     private static final String ACCESS_TOKEN_STATE = "ATS";
@@ -109,6 +110,7 @@ public class AccountSavedThingActivity extends BaseActivity {
 
         setSupportActionBar(toolbar);
         getSupportActionBar().setDisplayHomeAsUpEnabled(true);
+        setToolbarGoToTop(toolbar);
 
         params = (AppBarLayout.LayoutParams) collapsingToolbarLayout.getLayoutParams();
 
@@ -275,6 +277,13 @@ public class AccountSavedThingActivity extends BaseActivity {
         sectionsPagerAdapter.changeNSFW(changeNSFWEvent.nsfw);
     }
 
+    @Override
+    public void onLongPress() {
+        if (sectionsPagerAdapter != null) {
+            sectionsPagerAdapter.goBackToTop();
+        }
+    }
+
     private class SectionsPagerAdapter extends FragmentPagerAdapter {
         private PostFragment postFragment;
         private CommentsListingFragment commentsListingFragment;
@@ -383,5 +392,13 @@ public class AccountSavedThingActivity extends BaseActivity {
                 postFragment.changeNSFW(nsfw);
             }
         }
+
+        public void goBackToTop() {
+            if (viewPager.getCurrentItem() == 0) {
+                postFragment.goBackToTop();
+            } else {
+                commentsListingFragment.goBackToTop();
+            }
+        }
     }
 }

app/src/main/java/ml/docilealligator/infinityforreddit/Activity/BaseActivity.java

@@ -25,6 +25,7 @@ import com.google.android.material.appbar.AppBarLayout;
 import com.google.android.material.floatingactionbutton.FloatingActionButton;
 import com.google.android.material.tabs.TabLayout;
 
+import ml.docilealligator.infinityforreddit.ActivityToolbarInterface;
 import ml.docilealligator.infinityforreddit.AppBarStateChangeListener;
 import ml.docilealligator.infinityforreddit.ContentFontStyle;
 import ml.docilealligator.infinityforreddit.CustomTheme.CustomThemeWrapper;
@@ -183,6 +184,18 @@ public abstract class BaseActivity extends AppCompatActivity {
         return immersiveInterface;
     }
 
+    protected void setToolbarGoToTop(Toolbar toolbar) {
+        toolbar.setOnLongClickListener(new View.OnLongClickListener() {
+            @Override
+            public boolean onLongClick(View view) {
+                if (BaseActivity.this instanceof ActivityToolbarInterface) {
+                    ((ActivityToolbarInterface) BaseActivity.this).onLongPress();
+                }
+                return true;
+            }
+        });
+    }
+
     protected void adjustToolbar(Toolbar toolbar) {
         int statusBarResourceId = getResources().getIdentifier("status_bar_height", "dimen", "android");
         if (statusBarResourceId > 0) {

app/src/main/java/ml/docilealligator/infinityforreddit/Activity/FilteredThingActivity.java

@@ -25,6 +25,7 @@ import javax.inject.Named;
 
 import butterknife.BindView;
 import butterknife.ButterKnife;
+import ml.docilealligator.infinityforreddit.ActivityToolbarInterface;
 import ml.docilealligator.infinityforreddit.AsyncTask.GetCurrentAccountAsyncTask;
 import ml.docilealligator.infinityforreddit.CustomTheme.CustomThemeWrapper;
 import ml.docilealligator.infinityforreddit.Event.SwitchAccountEvent;
@@ -45,7 +46,7 @@ import ml.docilealligator.infinityforreddit.SortTypeSelectionCallback;
 import ml.docilealligator.infinityforreddit.Utils.SharedPreferencesUtils;
 
 public class FilteredThingActivity extends BaseActivity implements SortTypeSelectionCallback,
-        PostLayoutBottomSheetFragment.PostLayoutSelectionCallback {
+        PostLayoutBottomSheetFragment.PostLayoutSelectionCallback, ActivityToolbarInterface {
 
     public static final String EXTRA_NAME = "ESN";
     public static final String EXTRA_QUERY = "EQ";
@@ -123,6 +124,7 @@ public class FilteredThingActivity extends BaseActivity implements SortTypeSelec
 
         setSupportActionBar(toolbar);
         getSupportActionBar().setDisplayHomeAsUpEnabled(true);
+        setToolbarGoToTop(toolbar);
 
         params = (AppBarLayout.LayoutParams) collapsingToolbarLayout.getLayoutParams();
 
@@ -429,4 +431,11 @@ public class FilteredThingActivity extends BaseActivity implements SortTypeSelec
     public void onAccountSwitchEvent(SwitchAccountEvent event) {
         finish();
     }
+
+    @Override
+    public void onLongPress() {
+        if (mFragment != null) {
+            ((PostFragment) mFragment).goBackToTop();
+        }
+    }
 }

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

@@ -58,6 +58,7 @@ import javax.inject.Named;
 import butterknife.BindView;
 import butterknife.ButterKnife;
 import ml.docilealligator.infinityforreddit.Account.AccountViewModel;
+import ml.docilealligator.infinityforreddit.ActivityToolbarInterface;
 import ml.docilealligator.infinityforreddit.Adapter.NavigationDrawerRecyclerViewAdapter;
 import ml.docilealligator.infinityforreddit.AsyncTask.GetCurrentAccountAsyncTask;
 import ml.docilealligator.infinityforreddit.AsyncTask.InsertSubscribedThingsAsyncTask;
@@ -97,7 +98,8 @@ import static androidx.appcompat.app.AppCompatDelegate.MODE_NIGHT_NO;
 import static androidx.appcompat.app.AppCompatDelegate.MODE_NIGHT_YES;
 
 public class MainActivity extends BaseActivity implements SortTypeSelectionCallback,
-        PostTypeBottomSheetFragment.PostTypeSelectionCallback, PostLayoutBottomSheetFragment.PostLayoutSelectionCallback {
+        PostTypeBottomSheetFragment.PostTypeSelectionCallback, PostLayoutBottomSheetFragment.PostLayoutSelectionCallback,
+        ActivityToolbarInterface {
 
     static final String EXTRA_POST_TYPE = "EPT";
     static final String EXTRA_MESSSAGE_FULLNAME = "ENF";
@@ -247,6 +249,7 @@ public class MainActivity extends BaseActivity implements SortTypeSelectionCallb
         postLayoutBottomSheetFragment = new PostLayoutBottomSheetFragment();
 
         setSupportActionBar(toolbar);
+        setToolbarGoToTop(toolbar);
 
         drawer = findViewById(R.id.drawer_layout);
         ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
@@ -921,6 +924,13 @@ public class MainActivity extends BaseActivity implements SortTypeSelectionCallb
         mLockBottomAppBar = changeLockBottomAppBarEvent.lockBottomAppBar;
     }
 
+    @Override
+    public void onLongPress() {
+        if (sectionsPagerAdapter != null) {
+            sectionsPagerAdapter.goBackToTop();
+        }
+    }
+
     private class SectionsPagerAdapter extends FragmentPagerAdapter {
         private PostFragment tab1;
         private PostFragment tab2;
@@ -1341,5 +1351,15 @@ public class MainActivity extends BaseActivity implements SortTypeSelectionCallb
                 }
             }
         }
+
+        void goBackToTop() {
+            if (viewPager.getCurrentItem() == 0) {
+                tab1.goBackToTop();
+            } else if (viewPager.getCurrentItem() == 1) {
+                tab2.goBackToTop();
+            } else {
+                tab3.goBackToTop();
+            }
+        }
     }
 }

app/src/main/java/ml/docilealligator/infinityforreddit/Activity/SearchResultActivity.java

@@ -30,6 +30,7 @@ import javax.inject.Named;
 
 import butterknife.BindView;
 import butterknife.ButterKnife;
+import ml.docilealligator.infinityforreddit.ActivityToolbarInterface;
 import ml.docilealligator.infinityforreddit.AsyncTask.GetCurrentAccountAsyncTask;
 import ml.docilealligator.infinityforreddit.CustomTheme.CustomThemeWrapper;
 import ml.docilealligator.infinityforreddit.Event.ChangeNSFWEvent;
@@ -51,7 +52,7 @@ import ml.docilealligator.infinityforreddit.SortTypeSelectionCallback;
 import ml.docilealligator.infinityforreddit.Utils.SharedPreferencesUtils;
 
 public class SearchResultActivity extends BaseActivity implements SortTypeSelectionCallback,
-        PostLayoutBottomSheetFragment.PostLayoutSelectionCallback {
+        PostLayoutBottomSheetFragment.PostLayoutSelectionCallback, ActivityToolbarInterface {
     static final String EXTRA_QUERY = "QK";
     static final String EXTRA_SUBREDDIT_NAME = "ESN";
 
@@ -121,6 +122,7 @@ public class SearchResultActivity extends BaseActivity implements SortTypeSelect
 
         setSupportActionBar(toolbar);
         getSupportActionBar().setDisplayHomeAsUpEnabled(true);
+        setToolbarGoToTop(toolbar);
 
         if (savedInstanceState == null) {
             getCurrentAccountAndInitializeViewPager();
@@ -295,6 +297,13 @@ public class SearchResultActivity extends BaseActivity implements SortTypeSelect
         sectionsPagerAdapter.changeNSFW(changeNSFWEvent.nsfw);
     }
 
+    @Override
+    public void onLongPress() {
+        if (sectionsPagerAdapter != null) {
+            sectionsPagerAdapter.goBackToTop();
+        }
+    }
+
     private class SectionsPagerAdapter extends FragmentPagerAdapter {
 
         private PostFragment postFragment;
@@ -417,7 +426,7 @@ public class SearchResultActivity extends BaseActivity implements SortTypeSelect
             }
         }
 
-        public void changeNSFW(boolean nsfw) {
+        void changeNSFW(boolean nsfw) {
             if (postFragment != null) {
                 postFragment.changeNSFW(nsfw);
             }
@@ -429,5 +438,15 @@ public class SearchResultActivity extends BaseActivity implements SortTypeSelect
                 ((FragmentCommunicator) postFragment).changePostLayout(postLayout);
             }
         }
+
+        void goBackToTop() {
+            if (viewPager.getCurrentItem() == 0) {
+                postFragment.goBackToTop();
+            } else if (viewPager.getCurrentItem() == 1) {
+                subredditListingFragment.goBackToTop();
+            } else {
+                userListingFragment.goBackToTop();
+            }
+        }
     }
 }

app/src/main/java/ml/docilealligator/infinityforreddit/Activity/SearchSubredditsResultActivity.java

@@ -24,6 +24,7 @@ import javax.inject.Named;
 
 import butterknife.BindView;
 import butterknife.ButterKnife;
+import ml.docilealligator.infinityforreddit.ActivityToolbarInterface;
 import ml.docilealligator.infinityforreddit.AsyncTask.GetCurrentAccountAsyncTask;
 import ml.docilealligator.infinityforreddit.CustomTheme.CustomThemeWrapper;
 import ml.docilealligator.infinityforreddit.Event.SwitchAccountEvent;
@@ -32,7 +33,7 @@ import ml.docilealligator.infinityforreddit.Infinity;
 import ml.docilealligator.infinityforreddit.R;
 import ml.docilealligator.infinityforreddit.RedditDataRoomDatabase;
 
-public class SearchSubredditsResultActivity extends BaseActivity {
+public class SearchSubredditsResultActivity extends BaseActivity implements ActivityToolbarInterface {
 
     static final String EXTRA_QUERY = "EQ";
     static final String EXTRA_RETURN_SUBREDDIT_NAME = "ERSN";
@@ -90,6 +91,7 @@ public class SearchSubredditsResultActivity extends BaseActivity {
 
         setSupportActionBar(toolbar);
         getSupportActionBar().setDisplayHomeAsUpEnabled(true);
+        setToolbarGoToTop(toolbar);
 
         String query = getIntent().getExtras().getString(EXTRA_QUERY);
 
@@ -180,4 +182,11 @@ public class SearchSubredditsResultActivity extends BaseActivity {
     public void onAccountSwitchEvent(SwitchAccountEvent event) {
         finish();
     }
+
+    @Override
+    public void onLongPress() {
+        if (mFragment != null) {
+            ((SubredditListingFragment) mFragment).goBackToTop();
+        }
+    }
 }

app/src/main/java/ml/docilealligator/infinityforreddit/Activity/SelectedSubredditsActivity.java

@@ -24,12 +24,13 @@ import javax.inject.Named;
 
 import butterknife.BindView;
 import butterknife.ButterKnife;
+import ml.docilealligator.infinityforreddit.ActivityToolbarInterface;
 import ml.docilealligator.infinityforreddit.Adapter.SelectedSubredditsRecyclerViewAdapter;
 import ml.docilealligator.infinityforreddit.CustomTheme.CustomThemeWrapper;
 import ml.docilealligator.infinityforreddit.Infinity;
 import ml.docilealligator.infinityforreddit.R;
 
-public class SelectedSubredditsActivity extends BaseActivity {
+public class SelectedSubredditsActivity extends BaseActivity implements ActivityToolbarInterface {
 
     public static final String EXTRA_SELECTED_SUBREDDITS = "ESS";
     public static final String EXTRA_RETURN_SELECTED_SUBREDDITS = "ERSS";
@@ -51,6 +52,7 @@ public class SelectedSubredditsActivity extends BaseActivity {
     SharedPreferences mSharedPreferences;
     @Inject
     CustomThemeWrapper mCustomThemeWrapper;
+    private LinearLayoutManager linearLayoutManager;
     private SelectedSubredditsRecyclerViewAdapter adapter;
     private ArrayList<String> subreddits;
 
@@ -65,6 +67,7 @@ public class SelectedSubredditsActivity extends BaseActivity {
 
         setSupportActionBar(toolbar);
         getSupportActionBar().setDisplayHomeAsUpEnabled(true);
+        setToolbarGoToTop(toolbar);
 
         if (savedInstanceState != null) {
             subreddits = savedInstanceState.getStringArrayList(SELECTED_SUBREDDITS_STATE);
@@ -73,7 +76,8 @@ public class SelectedSubredditsActivity extends BaseActivity {
         }
 
         adapter = new SelectedSubredditsRecyclerViewAdapter(mCustomThemeWrapper, subreddits);
-        recyclerView.setLayoutManager(new LinearLayoutManager(this));
+        linearLayoutManager = new LinearLayoutManager(this);
+        recyclerView.setLayoutManager(linearLayoutManager);
         recyclerView.setAdapter(adapter);
         recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
             @Override
@@ -154,4 +158,11 @@ public class SelectedSubredditsActivity extends BaseActivity {
         applyAppBarLayoutAndToolbarTheme(appBarLayout, toolbar);
         applyFABTheme(fab);
     }
+
+    @Override
+    public void onLongPress() {
+        if (linearLayoutManager != null) {
+            linearLayoutManager.scrollToPositionWithOffset(0, 0);
+        }
+    }
 }

app/src/main/java/ml/docilealligator/infinityforreddit/Activity/SubredditMultiselectionActivity.java

@@ -34,6 +34,7 @@ import javax.inject.Named;
 
 import butterknife.BindView;
 import butterknife.ButterKnife;
+import ml.docilealligator.infinityforreddit.ActivityToolbarInterface;
 import ml.docilealligator.infinityforreddit.Adapter.SubredditMultiselectionRecyclerViewAdapter;
 import ml.docilealligator.infinityforreddit.AsyncTask.GetCurrentAccountAsyncTask;
 import ml.docilealligator.infinityforreddit.CustomTheme.CustomThemeWrapper;
@@ -43,7 +44,7 @@ import ml.docilealligator.infinityforreddit.RedditDataRoomDatabase;
 import ml.docilealligator.infinityforreddit.SubscribedSubredditDatabase.SubscribedSubredditViewModel;
 import retrofit2.Retrofit;
 
-public class SubredditMultiselectionActivity extends BaseActivity {
+public class SubredditMultiselectionActivity extends BaseActivity implements ActivityToolbarInterface {
 
     static final String EXTRA_RETURN_SELECTED_SUBREDDITS = "ERSS";
 
@@ -82,6 +83,7 @@ public class SubredditMultiselectionActivity extends BaseActivity {
     private boolean mNullAccessToken = false;
     private String mAccessToken;
     private String mAccountName;
+    private LinearLayoutManager mLinearLayoutManager;
     private SubredditMultiselectionRecyclerViewAdapter mAdapter;
     private RequestManager mGlide;
     @Override
@@ -149,7 +151,8 @@ public class SubredditMultiselectionActivity extends BaseActivity {
     }
 
     private void bindView() {
-        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
+        mLinearLayoutManager = new LinearLayoutManager(this);
+        mRecyclerView.setLayoutManager(mLinearLayoutManager);
         mAdapter = new SubredditMultiselectionRecyclerViewAdapter(this, mCustomThemeWrapper);
         mRecyclerView.setAdapter(mAdapter);
 
@@ -240,4 +243,11 @@ public class SubredditMultiselectionActivity extends BaseActivity {
         applyAppBarLayoutAndToolbarTheme(mAppBarLayout, mToolbar);
         mErrorTextView.setTextColor(mCustomThemeWrapper.getSecondaryTextColor());
     }
+
+    @Override
+    public void onLongPress() {
+        if (mLinearLayoutManager != null) {
+            mLinearLayoutManager.scrollToPositionWithOffset(0, 0);
+        }
+    }
 }

app/src/main/java/ml/docilealligator/infinityforreddit/Activity/SubredditSelectionActivity.java

@@ -28,6 +28,7 @@ import javax.inject.Named;
 
 import butterknife.BindView;
 import butterknife.ButterKnife;
+import ml.docilealligator.infinityforreddit.ActivityToolbarInterface;
 import ml.docilealligator.infinityforreddit.AsyncTask.GetCurrentAccountAsyncTask;
 import ml.docilealligator.infinityforreddit.AsyncTask.InsertSubscribedThingsAsyncTask;
 import ml.docilealligator.infinityforreddit.CustomTheme.CustomThemeWrapper;
@@ -42,7 +43,7 @@ import ml.docilealligator.infinityforreddit.SubscribedSubredditDatabase.Subscrib
 import ml.docilealligator.infinityforreddit.SubscribedUserDatabase.SubscribedUserData;
 import retrofit2.Retrofit;
 
-public class SubredditSelectionActivity extends BaseActivity {
+public class SubredditSelectionActivity extends BaseActivity implements ActivityToolbarInterface {
 
     static final String EXTRA_EXTRA_CLEAR_SELECTION = "EECS";
     static final String EXTRA_RETURN_SUBREDDIT_NAME = "ERSN";
@@ -274,4 +275,11 @@ public class SubredditSelectionActivity extends BaseActivity {
     public void onAccountSwitchEvent(SwitchAccountEvent event) {
         finish();
     }
+
+    @Override
+    public void onLongPress() {
+        if (mFragment != null) {
+            ((SubscribedSubredditsListingFragment) mFragment).goBackToTop();
+        }
+    }
 }

app/src/main/java/ml/docilealligator/infinityforreddit/Activity/SubscribedThingListingActivity.java

@@ -30,6 +30,7 @@ import javax.inject.Named;
 
 import butterknife.BindView;
 import butterknife.ButterKnife;
+import ml.docilealligator.infinityforreddit.ActivityToolbarInterface;
 import ml.docilealligator.infinityforreddit.AsyncTask.GetCurrentAccountAsyncTask;
 import ml.docilealligator.infinityforreddit.AsyncTask.InsertSubscribedThingsAsyncTask;
 import ml.docilealligator.infinityforreddit.CustomTheme.CustomThemeWrapper;
@@ -46,7 +47,7 @@ import ml.docilealligator.infinityforreddit.SubscribedSubredditDatabase.Subscrib
 import ml.docilealligator.infinityforreddit.SubscribedUserDatabase.SubscribedUserData;
 import retrofit2.Retrofit;
 
-public class SubscribedThingListingActivity extends BaseActivity {
+public class SubscribedThingListingActivity extends BaseActivity implements ActivityToolbarInterface {
 
     private static final String INSERT_SUBSCRIBED_SUBREDDIT_STATE = "ISSS";
     private static final String NULL_ACCESS_TOKEN_STATE = "NATS";
@@ -108,6 +109,7 @@ public class SubscribedThingListingActivity extends BaseActivity {
 
         setSupportActionBar(toolbar);
         getSupportActionBar().setDisplayHomeAsUpEnabled(true);
+        setToolbarGoToTop(toolbar);
 
         if (savedInstanceState != null) {
             mInsertSuccess = savedInstanceState.getBoolean(INSERT_SUBSCRIBED_SUBREDDIT_STATE);
@@ -225,6 +227,13 @@ public class SubscribedThingListingActivity extends BaseActivity {
         finish();
     }
 
+    @Override
+    public void onLongPress() {
+        if (sectionsPagerAdapter != null) {
+            sectionsPagerAdapter.goBackToTop();
+        }
+    }
+
     private class SectionsPagerAdapter extends FragmentPagerAdapter {
 
         private SubscribedSubredditsListingFragment subscribedSubredditsListingFragment;
@@ -287,7 +296,7 @@ public class SubscribedThingListingActivity extends BaseActivity {
             return fragment;
         }
 
-        public void stopRefreshProgressbar() {
+        void stopRefreshProgressbar() {
             if (subscribedSubredditsListingFragment != null) {
                 ((FragmentCommunicator) subscribedSubredditsListingFragment).stopRefreshProgressbar();
             }
@@ -295,5 +304,13 @@ public class SubscribedThingListingActivity extends BaseActivity {
                 ((FragmentCommunicator) followedUsersListingFragment).stopRefreshProgressbar();
             }
         }
+
+        void goBackToTop() {
+            if (viewPager.getCurrentItem() == 0) {
+                subscribedSubredditsListingFragment.goBackToTop();
+            } else {
+                followedUsersListingFragment.goBackToTop();
+            }
+        }
     }
 }

app/src/main/java/ml/docilealligator/infinityforreddit/Activity/ViewMessageActivity.java

@@ -35,6 +35,7 @@ import javax.inject.Named;
 
 import butterknife.BindView;
 import butterknife.ButterKnife;
+import ml.docilealligator.infinityforreddit.ActivityToolbarInterface;
 import ml.docilealligator.infinityforreddit.Adapter.MessageRecyclerViewAdapter;
 import ml.docilealligator.infinityforreddit.AsyncTask.GetCurrentAccountAsyncTask;
 import ml.docilealligator.infinityforreddit.AsyncTask.SwitchAccountAsyncTask;
@@ -48,7 +49,7 @@ import ml.docilealligator.infinityforreddit.R;
 import ml.docilealligator.infinityforreddit.RedditDataRoomDatabase;
 import retrofit2.Retrofit;
 
-public class ViewMessageActivity extends BaseActivity {
+public class ViewMessageActivity extends BaseActivity implements ActivityToolbarInterface {
 
     public static final String EXTRA_NEW_ACCOUNT_NAME = "ENAN";
 
@@ -90,6 +91,7 @@ public class ViewMessageActivity extends BaseActivity {
     private String mNewAccountName;
     private MessageRecyclerViewAdapter mAdapter;
     private RequestManager mGlide;
+    private LinearLayoutManager mLinearLayoutManager;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -127,6 +129,7 @@ public class ViewMessageActivity extends BaseActivity {
 
         mToolbar.setTitle(R.string.inbox);
         setSupportActionBar(mToolbar);
+        setToolbarGoToTop(mToolbar);
 
         if (savedInstanceState != null) {
             mNullAccessToken = savedInstanceState.getBoolean(NULL_ACCESS_TOKEN_STATE);
@@ -199,10 +202,10 @@ public class ViewMessageActivity extends BaseActivity {
     private void bindView() {
         mAdapter = new MessageRecyclerViewAdapter(this, mOauthRetrofit, mCustomThemeWrapper,
                 mAccessToken, () -> mMessageViewModel.retryLoadingMore());
-        LinearLayoutManager layoutManager = new LinearLayoutManager(this);
+        mLinearLayoutManager = new LinearLayoutManager(this);
-        mRecyclerView.setLayoutManager(layoutManager);
+        mRecyclerView.setLayoutManager(mLinearLayoutManager);
         mRecyclerView.setAdapter(mAdapter);
-        DividerItemDecoration dividerItemDecoration = new DividerItemDecoration(this, layoutManager.getOrientation());
+        DividerItemDecoration dividerItemDecoration = new DividerItemDecoration(this, mLinearLayoutManager.getOrientation());
         mRecyclerView.addItemDecoration(dividerItemDecoration);
 
         MessageViewModel.Factory factory = new MessageViewModel.Factory(mOauthRetrofit,
@@ -296,4 +299,11 @@ public class ViewMessageActivity extends BaseActivity {
     private void onRefresh() {
         mMessageViewModel.refresh();
     }
+
+    @Override
+    public void onLongPress() {
+        if (mLinearLayoutManager != null) {
+            mLinearLayoutManager.scrollToPositionWithOffset(0, 0);
+        }
+    }
 }

app/src/main/java/ml/docilealligator/infinityforreddit/Activity/ViewMultiRedditDetailActivity.java

@@ -26,6 +26,7 @@ import javax.inject.Named;
 
 import butterknife.BindView;
 import butterknife.ButterKnife;
+import ml.docilealligator.infinityforreddit.ActivityToolbarInterface;
 import ml.docilealligator.infinityforreddit.AsyncTask.GetCurrentAccountAsyncTask;
 import ml.docilealligator.infinityforreddit.CustomTheme.CustomThemeWrapper;
 import ml.docilealligator.infinityforreddit.Event.RefreshMultiRedditsEvent;
@@ -46,7 +47,7 @@ import ml.docilealligator.infinityforreddit.Utils.SharedPreferencesUtils;
 import retrofit2.Retrofit;
 
 public class ViewMultiRedditDetailActivity extends BaseActivity implements SortTypeSelectionCallback,
-        PostLayoutBottomSheetFragment.PostLayoutSelectionCallback {
+        PostLayoutBottomSheetFragment.PostLayoutSelectionCallback, ActivityToolbarInterface {
 
     public static final String EXTRA_MULTIREDDIT_DATA = "EMD";
     public static final String EXTRA_MULTIREDDIT_PATH = "EMP";
@@ -136,6 +137,7 @@ public class ViewMultiRedditDetailActivity extends BaseActivity implements SortT
 
         setSupportActionBar(toolbar);
         getSupportActionBar().setDisplayHomeAsUpEnabled(true);
+        setToolbarGoToTop(toolbar);
 
         if (savedInstanceState != null) {
             mNullAccessToken = savedInstanceState.getBoolean(NULL_ACCESS_TOKEN_STATE);
@@ -337,4 +339,11 @@ public class ViewMultiRedditDetailActivity extends BaseActivity implements SortT
         coordinatorLayout.setBackgroundColor(mCustomThemeWrapper.getBackgroundColor());
         applyAppBarLayoutAndToolbarTheme(appBarLayout, toolbar);
     }
+
+    @Override
+    public void onLongPress() {
+        if (mFragment != null) {
+            ((PostFragment) mFragment).goBackToTop();
+        }
+    }
 }

app/src/main/java/ml/docilealligator/infinityforreddit/Activity/ViewPostDetailActivity.java

@@ -55,6 +55,7 @@ import butterknife.ButterKnife;
 import im.ene.toro.exoplayer.ExoCreator;
 import im.ene.toro.media.PlaybackInfo;
 import im.ene.toro.media.VolumeInfo;
+import ml.docilealligator.infinityforreddit.ActivityToolbarInterface;
 import ml.docilealligator.infinityforreddit.Adapter.CommentAndPostRecyclerViewAdapter;
 import ml.docilealligator.infinityforreddit.AsyncTask.GetCurrentAccountAsyncTask;
 import ml.docilealligator.infinityforreddit.AsyncTask.SwitchAccountAsyncTask;
@@ -98,7 +99,7 @@ import static ml.docilealligator.infinityforreddit.Activity.CommentActivity.RETU
 import static ml.docilealligator.infinityforreddit.Activity.CommentActivity.WRITE_COMMENT_REQUEST_CODE;
 
 public class ViewPostDetailActivity extends BaseActivity implements FlairBottomSheetFragment.FlairSelectionCallback,
-        SortTypeSelectionCallback {
+        SortTypeSelectionCallback, ActivityToolbarInterface {
 
     public static final String EXTRA_POST_DATA = "EPD";
     public static final String EXTRA_POST_LIST_POSITION = "EPLI";
@@ -242,6 +243,7 @@ public class ViewPostDetailActivity extends BaseActivity implements FlairBottomS
 
         mToolbar.setTitle("");
         setSupportActionBar(mToolbar);
+        setToolbarGoToTop(mToolbar);
 
         mVolumeKeysNavigateComments = mSharedPreferences.getBoolean(SharedPreferencesUtils.VOLUME_KEYS_NAVIGATE_COMMENTS, false);
         mLockFab = mSharedPreferences.getBoolean(SharedPreferencesUtils.LOCK_JUMP_TO_NEXT_TOP_LEVEL_COMMENT_BUTTON, false);
@@ -1629,4 +1631,11 @@ public class ViewPostDetailActivity extends BaseActivity implements FlairBottomS
             mSlidrInterface.unlock();
         }
     }
+
+    @Override
+    public void onLongPress() {
+        if (mLinearLayoutManager != null) {
+            mLinearLayoutManager.scrollToPositionWithOffset(0, 0);
+        }
+    }
 }

app/src/main/java/ml/docilealligator/infinityforreddit/Activity/ViewSidebarActivity.java

@@ -43,6 +43,7 @@ import io.noties.markwon.recycler.table.TableEntry;
 import io.noties.markwon.recycler.table.TableEntryPlugin;
 import io.noties.markwon.simple.ext.SimpleExtPlugin;
 import io.noties.markwon.urlprocessor.UrlProcessorRelativeToAbsolute;
+import ml.docilealligator.infinityforreddit.ActivityToolbarInterface;
 import ml.docilealligator.infinityforreddit.AsyncTask.InsertSubredditDataAsyncTask;
 import ml.docilealligator.infinityforreddit.CustomTheme.CustomThemeWrapper;
 import ml.docilealligator.infinityforreddit.FetchSubredditData;
@@ -53,7 +54,7 @@ import ml.docilealligator.infinityforreddit.SubredditDatabase.SubredditData;
 import ml.docilealligator.infinityforreddit.SubredditDatabase.SubredditViewModel;
 import retrofit2.Retrofit;
 
-public class ViewSidebarActivity extends BaseActivity {
+public class ViewSidebarActivity extends BaseActivity implements ActivityToolbarInterface {
 
     public static final String EXTRA_SUBREDDIT_NAME = "ESN";
     @BindView(R.id.coordinator_layout_view_sidebar_activity)
@@ -77,6 +78,7 @@ public class ViewSidebarActivity extends BaseActivity {
     @Inject
     CustomThemeWrapper mCustomThemeWrapper;
     public SubredditViewModel mSubredditViewModel;
+    private LinearLayoutManager mLinearLayoutManager;
     private String subredditName;
     private int markdownColor;
 
@@ -123,6 +125,7 @@ public class ViewSidebarActivity extends BaseActivity {
         toolbar.setTitle("r/" + subredditName);
         setSupportActionBar(toolbar);
         getSupportActionBar().setDisplayHomeAsUpEnabled(true);
+        setToolbarGoToTop(toolbar);
 
         Markwon markwon = Markwon.builder(this)
                 .usePlugin(new AbstractMarkwonPlugin() {
@@ -161,7 +164,8 @@ public class ViewSidebarActivity extends BaseActivity {
                         .textLayoutIsRoot(R.layout.view_table_entry_cell)))
                 .build();
 
-        markdownRecyclerView.setLayoutManager(new LinearLayoutManager(this));
+        mLinearLayoutManager = new LinearLayoutManager(this);
+        markdownRecyclerView.setLayoutManager(mLinearLayoutManager);
         markdownRecyclerView.setAdapter(markwonAdapter);
 
         mSubredditViewModel = new ViewModelProvider(this,
@@ -237,4 +241,11 @@ public class ViewSidebarActivity extends BaseActivity {
         swipeRefreshLayout.setColorSchemeColors(mCustomThemeWrapper.getColorAccent());
         markdownColor = mCustomThemeWrapper.getSecondaryTextColor();
     }
+
+    @Override
+    public void onLongPress() {
+        if (mLinearLayoutManager != null) {
+            mLinearLayoutManager.scrollToPositionWithOffset(0, 0);
+        }
+    }
 }

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

@@ -50,6 +50,7 @@ import javax.inject.Named;
 import butterknife.BindView;
 import butterknife.ButterKnife;
 import jp.wasabeef.glide.transformations.RoundedCornersTransformation;
+import ml.docilealligator.infinityforreddit.ActivityToolbarInterface;
 import ml.docilealligator.infinityforreddit.AppBarStateChangeListener;
 import ml.docilealligator.infinityforreddit.AsyncTask.CheckIsSubscribedToSubredditAsyncTask;
 import ml.docilealligator.infinityforreddit.AsyncTask.GetCurrentAccountAsyncTask;
@@ -81,7 +82,8 @@ import pl.droidsonroids.gif.GifImageView;
 import retrofit2.Retrofit;
 
 public class ViewSubredditDetailActivity extends BaseActivity implements SortTypeSelectionCallback,
-        PostTypeBottomSheetFragment.PostTypeSelectionCallback, PostLayoutBottomSheetFragment.PostLayoutSelectionCallback {
+        PostTypeBottomSheetFragment.PostTypeSelectionCallback, PostLayoutBottomSheetFragment.PostLayoutSelectionCallback,
+        ActivityToolbarInterface {
 
     public static final String EXTRA_SUBREDDIT_NAME_KEY = "ESN";
     public static final String EXTRA_MESSAGE_FULLNAME = "ENF";
@@ -327,6 +329,7 @@ public class ViewSubredditDetailActivity extends BaseActivity implements SortTyp
         toolbar.setTitle(title);
         adjustToolbar(toolbar);
         setSupportActionBar(toolbar);
+        setToolbarGoToTop(toolbar);
 
         glide = Glide.with(this);
         Locale locale = getResources().getConfiguration().locale;
@@ -843,6 +846,13 @@ public class ViewSubredditDetailActivity extends BaseActivity implements SortTyp
         sectionsPagerAdapter.changeNSFW(changeNSFWEvent.nsfw);
     }
 
+    @Override
+    public void onLongPress() {
+        if (sectionsPagerAdapter != null) {
+            sectionsPagerAdapter.goBackToTop();
+        }
+    }
+
     private class SectionsPagerAdapter extends FragmentPagerAdapter {
         private PostFragment postFragment;
         private SidebarFragment sidebarFragment;
@@ -965,5 +975,17 @@ public class ViewSubredditDetailActivity extends BaseActivity implements SortTyp
                 ((FragmentCommunicator) postFragment).changePostLayout(postLayout);
             }
         }
+
+        void goBackToTop() {
+            if (viewPager.getCurrentItem() == 0) {
+                if (postFragment != null) {
+                    postFragment.goBackToTop();
+                }
+            } else {
+                if (sidebarFragment != null) {
+                    sidebarFragment.goBackToTop();
+                }
+            }
+        }
     }
 }

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

@@ -49,6 +49,7 @@ import javax.inject.Named;
 import butterknife.BindView;
 import butterknife.ButterKnife;
 import jp.wasabeef.glide.transformations.RoundedCornersTransformation;
+import ml.docilealligator.infinityforreddit.ActivityToolbarInterface;
 import ml.docilealligator.infinityforreddit.AppBarStateChangeListener;
 import ml.docilealligator.infinityforreddit.AsyncTask.CheckIsFollowingUserAsyncTask;
 import ml.docilealligator.infinityforreddit.AsyncTask.GetCurrentAccountAsyncTask;
@@ -81,7 +82,7 @@ import pl.droidsonroids.gif.GifImageView;
 import retrofit2.Retrofit;
 
 public class ViewUserDetailActivity extends BaseActivity implements SortTypeSelectionCallback,
-        PostLayoutBottomSheetFragment.PostLayoutSelectionCallback {
+        PostLayoutBottomSheetFragment.PostLayoutSelectionCallback, ActivityToolbarInterface {
 
     public static final String EXTRA_USER_NAME_KEY = "EUNK";
     public static final String EXTRA_MESSAGE_FULLNAME = "ENF";
@@ -220,6 +221,7 @@ public class ViewUserDetailActivity extends BaseActivity implements SortTypeSele
         toolbar.setTitle(title);
 
         setSupportActionBar(toolbar);
+        setToolbarGoToTop(toolbar);
 
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
             Window window = getWindow();
@@ -711,6 +713,13 @@ public class ViewUserDetailActivity extends BaseActivity implements SortTypeSele
         sectionsPagerAdapter.changeNSFW(changeNSFWEvent.nsfw);
     }
 
+    @Override
+    public void onLongPress() {
+        if (sectionsPagerAdapter != null) {
+            sectionsPagerAdapter.goBackToTop();
+        }
+    }
+
     private static class InsertUserDataAsyncTask extends AsyncTask<Void, Void, Void> {
 
         private UserDao userDao;
@@ -876,5 +885,17 @@ public class ViewUserDetailActivity extends BaseActivity implements SortTypeSele
                 ((FragmentCommunicator) postFragment).changePostLayout(postLayout);
             }
         }
+
+        void goBackToTop() {
+            if (viewPager.getCurrentItem() == 0) {
+                if (postFragment != null) {
+                    postFragment.goBackToTop();
+                }
+            } else {
+                if (commentsListingFragment != null) {
+                    commentsListingFragment.goBackToTop();
+                }
+            }
+        }
     }
 }

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

@@ -0,0 +1,5 @@
+package ml.docilealligator.infinityforreddit;
+
+public interface ActivityToolbarInterface {
+    void onLongPress();
+}

app/src/main/java/ml/docilealligator/infinityforreddit/Fragment/CommentsListingFragment.java

@@ -95,6 +95,7 @@ public class CommentsListingFragment extends Fragment implements FragmentCommuni
     private String mAccessToken;
     private RequestManager mGlide;
     private Activity mActivity;
+    private LinearLayoutManager mLinearLayoutManager;
     private CommentsListingRecyclerViewAdapter mAdapter;
     private boolean mShowElapsedTime;
     private boolean mShowCommentDivider;
@@ -162,7 +163,8 @@ public class CommentsListingFragment extends Fragment implements FragmentCommuni
     }
 
     private void bindView(Resources resources) {
-        mCommentRecyclerView.setLayoutManager(new LinearLayoutManager(mActivity));
+        mLinearLayoutManager = new LinearLayoutManager(mActivity);
+        mCommentRecyclerView.setLayoutManager(mLinearLayoutManager);
 
         boolean voteButtonsOnTheRight = mSharedPreferences.getBoolean(SharedPreferencesUtils.VOTE_BUTTONS_ON_THE_RIGHT_KEY, false);
         mAdapter = new CommentsListingRecyclerViewAdapter(mActivity, mOauthRetrofit, customThemeWrapper,
@@ -265,4 +267,10 @@ public class CommentsListingFragment extends Fragment implements FragmentCommuni
             mGlide.load(R.drawable.error_image).into(mFetchCommentInfoImageView);
         }
     }
+
+    public void goBackToTop() {
+        if (mLinearLayoutManager != null) {
+            mLinearLayoutManager.scrollToPositionWithOffset(0, 0);
+        }
+    }
 }

app/src/main/java/ml/docilealligator/infinityforreddit/Fragment/FollowedUsersListingFragment.java

@@ -74,6 +74,7 @@ public class FollowedUsersListingFragment extends Fragment implements FragmentCo
     SubscribedUserViewModel mSubscribedUserViewModel;
     private Activity mActivity;
     private RequestManager mGlide;
+    private LinearLayoutManager mLinearLayoutManager;
 
     public FollowedUsersListingFragment() {
         // Required empty public constructor
@@ -104,7 +105,8 @@ public class FollowedUsersListingFragment extends Fragment implements FragmentCo
 
         mGlide = Glide.with(this);
 
-        mRecyclerView.setLayoutManager(new LinearLayoutManager(mActivity));
+        mLinearLayoutManager = new LinearLayoutManager(mActivity);
+        mRecyclerView.setLayoutManager(mLinearLayoutManager);
         FollowedUsersRecyclerViewAdapter adapter = new FollowedUsersRecyclerViewAdapter(mActivity,
                 mOauthRetrofit, mRedditDataRoomDatabase, customThemeWrapper,
                 getArguments().getString(EXTRA_ACCESS_TOKEN));
@@ -164,4 +166,10 @@ public class FollowedUsersListingFragment extends Fragment implements FragmentCo
         }
         mErrorTextView.setTextColor(customThemeWrapper.getSecondaryTextColor());
     }
+
+    public void goBackToTop() {
+        if (mLinearLayoutManager != null) {
+            mLinearLayoutManager.scrollToPositionWithOffset(0, 0);
+        }
+    }
 }

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

@@ -923,6 +923,20 @@ public class PostFragment extends Fragment implements FragmentCommunicator {
         }
     }
 
+    public void goBackToTop() {
+        if (mLinearLayoutManager != null) {
+            mLinearLayoutManager.scrollToPositionWithOffset(0, 0);
+            if (isInLazyMode) {
+                lazyModeRunnable.resetOldPosition();
+            }
+        } else if (mStaggeredGridLayoutManager != null) {
+            mStaggeredGridLayoutManager.scrollToPositionWithOffset(0, 0);
+            if (isInLazyMode) {
+                lazyModeRunnable.resetOldPosition();
+            }
+        }
+    }
+
     @Override
     public void onPause() {
         super.onPause();

app/src/main/java/ml/docilealligator/infinityforreddit/Fragment/SidebarFragment.java

@@ -63,6 +63,7 @@ public class SidebarFragment extends Fragment {
     private Activity activity;
     private String subredditName;
     public SubredditViewModel mSubredditViewModel;
+    private LinearLayoutManager linearLayoutManager;
     private int markdownColor;
     @Inject
     @Named("no_oauth")
@@ -133,7 +134,8 @@ public class SidebarFragment extends Fragment {
                         .textLayoutIsRoot(R.layout.view_table_entry_cell)))
                 .build();
 
-        recyclerView.setLayoutManager(new LinearLayoutManager(activity));
+        linearLayoutManager = new LinearLayoutManager(activity);
+        recyclerView.setLayoutManager(linearLayoutManager);
         recyclerView.setAdapter(markwonAdapter);
         recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
             @Override
@@ -188,4 +190,10 @@ public class SidebarFragment extends Fragment {
             }
         });
     }
+
+    public void goBackToTop() {
+        if (linearLayoutManager != null) {
+            linearLayoutManager.scrollToPositionWithOffset(0, 0);
+        }
+    }
 }

app/src/main/java/ml/docilealligator/infinityforreddit/Fragment/SubredditListingFragment.java

@@ -221,4 +221,10 @@ public class SubredditListingFragment extends Fragment implements FragmentCommun
         mSwipeRefreshLayout.setColorSchemeColors(customThemeWrapper.getColorAccent());
         mFetchSubredditListingInfoTextView.setTextColor(customThemeWrapper.getSecondaryTextColor());
     }
+
+    public void goBackToTop() {
+        if (mLinearLayoutManager != null) {
+            mLinearLayoutManager.scrollToPositionWithOffset(0, 0);
+        }
+    }
 }

app/src/main/java/ml/docilealligator/infinityforreddit/Fragment/SubscribedSubredditsListingFragment.java

@@ -78,6 +78,7 @@ public class SubscribedSubredditsListingFragment extends Fragment implements Fra
     public SubscribedSubredditViewModel mSubscribedSubredditViewModel;
     private Activity mActivity;
     private RequestManager mGlide;
+    private LinearLayoutManager mLinearLayoutManager;
 
     public SubscribedSubredditsListingFragment() {
         // Required empty public constructor
@@ -110,7 +111,8 @@ public class SubscribedSubredditsListingFragment extends Fragment implements Fra
 
         mGlide = Glide.with(this);
 
-        mRecyclerView.setLayoutManager(new LinearLayoutManager(mActivity));
+        mLinearLayoutManager = new LinearLayoutManager(mActivity);
+        mRecyclerView.setLayoutManager(mLinearLayoutManager);
 
         SubscribedSubredditsRecyclerViewAdapter adapter;
         if (getArguments().getBoolean(EXTRA_IS_SUBREDDIT_SELECTION)) {
@@ -180,4 +182,10 @@ public class SubscribedSubredditsListingFragment extends Fragment implements Fra
             mSwipeRefreshLayout.setEnabled(false);
         }
     }
+
+    public void goBackToTop() {
+        if (mLinearLayoutManager != null) {
+            mLinearLayoutManager.scrollToPositionWithOffset(0, 0);
+        }
+    }
 }

app/src/main/java/ml/docilealligator/infinityforreddit/Fragment/UserListingFragment.java

@@ -201,4 +201,10 @@ public class UserListingFragment extends Fragment implements FragmentCommunicato
         mSwipeRefreshLayout.setColorSchemeColors(customThemeWrapper.getColorAccent());
         mFetchUserListingInfoTextView.setTextColor(customThemeWrapper.getSecondaryTextColor());
     }
+
+    public void goBackToTop() {
+        if (mLinearLayoutManager != null) {
+            mLinearLayoutManager.scrollToPositionWithOffset(0, 0);
+        }
+    }
 }