Lock the bottom app bar.

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

@@ -72,6 +72,7 @@ import ml.docilealligator.infinityforreddit.AsyncTask.InsertSubscribedThingsAsyn
 import ml.docilealligator.infinityforreddit.AsyncTask.SwitchAccountAsyncTask;
 import ml.docilealligator.infinityforreddit.AsyncTask.SwitchToAnonymousAccountAsyncTask;
 import ml.docilealligator.infinityforreddit.Event.ChangeConfirmToExitEvent;
+import ml.docilealligator.infinityforreddit.Event.ChangeLockBottomAppBarEvent;
 import ml.docilealligator.infinityforreddit.Event.ChangeNSFWEvent;
 import ml.docilealligator.infinityforreddit.Event.RecreateActivityEvent;
 import ml.docilealligator.infinityforreddit.Event.SwitchAccountEvent;
@@ -216,6 +217,7 @@ public class MainActivity extends BaseActivity implements SortTypeSelectionCallb
     private boolean isInLazyMode = false;
     private boolean showBottomAppBar;
     private boolean mConfirmToExit;
+    private boolean mLockBottomAppBar;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -317,6 +319,7 @@ public class MainActivity extends BaseActivity implements SortTypeSelectionCallb
 
         showBottomAppBar = mSharedPreferences.getBoolean(SharedPreferencesUtils.BOTTOM_APP_BAR_KEY, false);
         mConfirmToExit = mSharedPreferences.getBoolean(SharedPreferencesUtils.CONFIRM_TO_EXIT, false);
+        mLockBottomAppBar = mSharedPreferences.getBoolean(SharedPreferencesUtils.LOCK_BOTTOM_APP_BAR, false);
 
         if (savedInstanceState != null) {
             mFetchUserInfoSuccess = savedInstanceState.getBoolean(FETCH_USER_INFO_STATE);
@@ -973,17 +976,21 @@ public class MainActivity extends BaseActivity implements SortTypeSelectionCallb
 
     public void postScrollUp() {
         if (mAccessToken != null) {
-            if (showBottomAppBar) {
+            if (showBottomAppBar && !mLockBottomAppBar) {
                 bottomNavigationView.performShow();
             }
+            if (!(showBottomAppBar && mLockBottomAppBar)) {
                 fab.show();
             }
         }
+    }
 
     public void postScrollDown() {
         if (mAccessToken != null) {
+            if (!(showBottomAppBar && mLockBottomAppBar)) {
                 fab.hide();
-            if (showBottomAppBar) {
+            }
+            if (showBottomAppBar && !mLockBottomAppBar) {
                 bottomNavigationView.performHide();
             }
         }
@@ -1011,6 +1018,11 @@ public class MainActivity extends BaseActivity implements SortTypeSelectionCallb
         mConfirmToExit = changeConfirmToExitEvent.confirmToExit;
     }
 
+    @Subscribe
+    public void onChangeLockBottomAppBar(ChangeLockBottomAppBarEvent changeLockBottomAppBarEvent) {
+        mLockBottomAppBar = changeLockBottomAppBarEvent.lockBottomAppBar;
+    }
+
     private class SectionsPagerAdapter extends FragmentPagerAdapter {
         private PostFragment frontPagePostFragment;
         private PostFragment popularPostFragment;

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

@@ -145,6 +145,7 @@ public class ViewSubredditDetailActivity extends BaseActivity implements SortTyp
     private boolean isInLazyMode = false;
     private boolean showToast = false;
     private boolean showBottomAppBar;
+    private boolean lockBottomAppBar;
     private String mMessageFullname;
     private String mNewAccountName;
     private RequestManager glide;
@@ -272,6 +273,7 @@ public class ViewSubredditDetailActivity extends BaseActivity implements SortTyp
         setSupportActionBar(toolbar);
 
         showBottomAppBar = mSharedPreferences.getBoolean(SharedPreferencesUtils.BOTTOM_APP_BAR_KEY, false);
+        lockBottomAppBar = mSharedPreferences.getBoolean(SharedPreferencesUtils.LOCK_BOTTOM_APP_BAR, false);
 
         glide = Glide.with(this);
 
@@ -690,17 +692,21 @@ public class ViewSubredditDetailActivity extends BaseActivity implements SortTyp
 
     public void postScrollUp() {
         if (mAccessToken != null) {
-            if (showBottomAppBar) {
+            if (showBottomAppBar && !lockBottomAppBar) {
                 bottomNavigationView.performShow();
             }
+            if (!(showBottomAppBar && lockBottomAppBar)) {
                 fab.show();
             }
         }
+    }
 
     public void postScrollDown() {
         if (mAccessToken != null) {
+            if (!(showBottomAppBar && lockBottomAppBar)) {
                 fab.hide();
-            if (showBottomAppBar) {
+            }
+            if (showBottomAppBar && !lockBottomAppBar) {
                 bottomNavigationView.performHide();
             }
         }

app/src/main/java/ml/docilealligator/infinityforreddit/Event/ChangeLockBottomAppBarEvent.java

@@ -0,0 +1,9 @@
+package ml.docilealligator.infinityforreddit.Event;
+
+public class ChangeLockBottomAppBarEvent {
+    public boolean lockBottomAppBar;
+
+    public ChangeLockBottomAppBarEvent(boolean lockBottomAppBar) {
+        this.lockBottomAppBar = lockBottomAppBar;
+    }
+}

app/src/main/java/ml/docilealligator/infinityforreddit/Settings/GesturesAndButtonsPreferenceFragment.java

@@ -11,8 +11,11 @@ import androidx.fragment.app.Fragment;
 import androidx.preference.PreferenceFragmentCompat;
 import androidx.preference.SwitchPreference;
 
+import org.greenrobot.eventbus.EventBus;
+
 import javax.inject.Inject;
 
+import ml.docilealligator.infinityforreddit.Event.ChangeLockBottomAppBarEvent;
 import ml.docilealligator.infinityforreddit.Infinity;
 import ml.docilealligator.infinityforreddit.R;
 import ml.docilealligator.infinityforreddit.Utils.SharedPreferencesUtils;
@@ -33,10 +36,12 @@ public class GesturesAndButtonsPreferenceFragment extends PreferenceFragmentComp
 
         SwitchPreference lockJumpToNextTopLevelCommentButtonSwitch =
                 findPreference(SharedPreferencesUtils.LOCK_JUMP_TO_NEXT_TOP_LEVEL_COMMENT_BUTTON);
+        SwitchPreference lockBottomAppBarSwitch = findPreference(SharedPreferencesUtils.LOCK_BOTTOM_APP_BAR);
         SwitchPreference swipeUpToHideJumpToNextTopLevelCommentButtonSwitch =
                 findPreference(SharedPreferencesUtils.SWIPE_UP_TO_HIDE_JUMP_TO_NEXT_TOP_LEVEL_COMMENT_BUTTON);
 
-        if (lockJumpToNextTopLevelCommentButtonSwitch != null && swipeUpToHideJumpToNextTopLevelCommentButtonSwitch != null) {
+        if (lockJumpToNextTopLevelCommentButtonSwitch != null && lockBottomAppBarSwitch != null &&
+                swipeUpToHideJumpToNextTopLevelCommentButtonSwitch != null) {
             lockJumpToNextTopLevelCommentButtonSwitch.setOnPreferenceChangeListener((preference, newValue) -> {
                 if ((Boolean) newValue) {
                     swipeUpToHideJumpToNextTopLevelCommentButtonSwitch.setVisible(false);
@@ -46,6 +51,14 @@ public class GesturesAndButtonsPreferenceFragment extends PreferenceFragmentComp
                 return true;
             });
 
+            if (sharedPreferences.getBoolean(SharedPreferencesUtils.BOTTOM_APP_BAR_KEY, false)) {
+                lockBottomAppBarSwitch.setVisible(true);
+                lockBottomAppBarSwitch.setOnPreferenceChangeListener((preference, newValue) -> {
+                    EventBus.getDefault().post(new ChangeLockBottomAppBarEvent((Boolean) newValue));
+                    return true;
+                });
+            }
+
             if (!sharedPreferences.getBoolean(SharedPreferencesUtils.LOCK_JUMP_TO_NEXT_TOP_LEVEL_COMMENT_BUTTON, false)) {
                 swipeUpToHideJumpToNextTopLevelCommentButtonSwitch.setVisible(true);
             }

app/src/main/java/ml/docilealligator/infinityforreddit/Utils/SharedPreferencesUtils.java

@@ -73,4 +73,5 @@ public class SharedPreferencesUtils {
     public static final String SWIPE_UP_TO_HIDE_JUMP_TO_NEXT_TOP_LEVEL_COMMENT_BUTTON = "swipe_up_to_hide_jump_to_next_top_level_comments_button";
     public static final String SHOW_TOP_LEVEL_COMMENTS_FIRST = "show_top_level_comments_first";
     public static final String CONFIRM_TO_EXIT = "confirm_to_exit";
+    public static final String LOCK_BOTTOM_APP_BAR = "lock_bottom_app_bar";
 }

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

@@ -309,7 +309,8 @@
     <string name="settings_show_divider_in_compact_layout">Show Divider in Compact Layout</string>
     <string name="settings_swipe_to_go_back_from_post_detail_title">Swipe Right to Go Back From Comments</string>
     <string name="settings_lock_jump_to_next_top_level_comment_button_title">Lock Jump to Next Top-level Comment Button</string>
-    <string name="settings_swipe_up_to_hide_jump_to_next_top_level_comment_button_title">Swipe Up to Hide Jump to Next Top Level Comment Button</string>
+    <string name="settings_lock_bottom_app_bar_title">Lock Bottom Navigation Bar</string>
+    <string name="settings_swipe_up_to_hide_jump_to_next_top_level_comment_button_title">Swipe Up to Hide Jump to Next Top-level Comment Button</string>
     <string name="settings_lazy_mode_interval_title">Lazy Mode Interval</string>
     <string name="settings_font_size_title">Font Size</string>
     <string name="settings_title_font_size_title">Title Font Size</string>

app/src/main/res/xml/gestures_and_buttons_preference.xml

@@ -17,6 +17,12 @@
         app:title="@string/settings_swipe_up_to_hide_jump_to_next_top_level_comment_button_title"
         app:isPreferenceVisible="false" />
 
+    <SwitchPreference
+        app:defaultValue="false"
+        app:key="lock_bottom_app_bar"
+        app:title="@string/settings_lock_bottom_app_bar_title"
+        app:isPreferenceVisible="false" />
+
     <SwitchPreference
         app:defaultValue="false"
         app:key="volume_keys_navigate_comments"