fix: implement AppBarTracking to fix navbar scroll behavior

- Make MainActivity implement HackRecyclerView.AppBarTracking interface
- Add AppBar offset tracking fields and methods
- Update NewsFragment and MsgFragment to set AppBarTracking on their RecyclerViews
- Fixes issue where navbar doesn't auto-hide when scrolling on some devices (e.g., Pixel 10)

The root cause was that HackRecyclerView's custom nested scroll handling
in dispatchNestedPreScroll() relies on AppBarTracking interface to get
the AppBar state, but MainActivity wasn't implementing this interface.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: graycreate

app/src/main/java/me/ghui/v2er/module/home/MainActivity.java

@@ -58,12 +58,13 @@
 import me.ghui.v2er.widget.BaseToolBar;
 import me.ghui.v2er.widget.CSlidingTabLayout;
 import me.ghui.v2er.widget.FollowProgressBtn;
+import me.ghui.v2er.widget.HackRecyclerView;
 import me.ghui.v2er.widget.dialog.ConfirmDialog;
 import me.ghui.v2er.widget.listener.AppBarStateChangeListener;
 
 public class MainActivity extends BaseActivity implements View.OnClickListener,
         UpdateUnReadMsgDelegate, CheckInContract.IView, OnTabSelectListener,
-        HomeFilterMenu.OnMenuItemClickListener {
+        HomeFilterMenu.OnMenuItemClickListener, HackRecyclerView.AppBarTracking {
 
     private static final String TAB_INDEX = KEY("tab_index");
     private static final String PAGE_ONE_DATA = KEY("page_one_data");
@@ -104,6 +105,10 @@ public class MainActivity extends BaseActivity implements View.OnClickListener,
     private VshareVersionChecker mVshareVersionChecker;
     private android.graphics.drawable.Drawable mOriginalNavIcon;
     private android.graphics.drawable.LayerDrawable mNavIconWithBadge;
+    // For AppBarTracking - fix scroll behavior on some devices
+    private int mAppBarOffset;
+    private boolean mAppBarIdle = false;
+    private int mAppBarMaxOffset;
 
     @Override
     protected int attachLayoutRes() {
@@ -284,6 +289,10 @@ public void onDrawerOpened(View drawerView) {
             @Override
             public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {
                 super.onOffsetChanged(appBarLayout, verticalOffset);
+                // Track AppBar offset for AppBarTracking interface
+                mAppBarOffset = verticalOffset;
+                mAppBarIdle = (mAppBarOffset >= 0) || (mAppBarOffset <= mAppBarMaxOffset);
+
                 // Calculate toolbar's visibility based on its position
                 int toolbarHeight = mToolbar.getHeight();
                 int statusBarHeight = Utils.getStatusBarHeight();
@@ -309,6 +318,7 @@ public void onStateChanged(AppBarLayout appBarLayout, AppBarStateChangeListener.
                 // IDLE state doesn't change the expanded status
             }
         });
+        mAppBarLayout.post(() -> mAppBarMaxOffset = -mAppBarLayout.getTotalScrollRange());
 
         TAB_TITLES[0] = TabInfo.getSelectTab().title;
         mViewPager.setAdapter(new SlidePagerAdapter(getSupportFragmentManager()));
@@ -642,6 +652,16 @@ public interface ChangeTabTypeDelegate {
         void changeTabType(TabInfo tabInfo);
     }
 
+    @Override
+    public boolean isAppBarExpanded() {
+        return mAppBarOffset == 0;
+    }
+
+    @Override
+    public boolean isAppBarIdle() {
+        return mAppBarIdle;
+    }
+
     private class SlidePagerAdapter extends FragmentPagerAdapter {
 
         public SlidePagerAdapter(FragmentManager fm) {

app/src/main/java/me/ghui/v2er/module/home/MsgFragment.java

@@ -16,6 +16,7 @@
 import me.ghui.v2er.module.topic.TopicActivity;
 import me.ghui.v2er.network.bean.NotificationInfo;
 import me.ghui.v2er.util.UserUtils;
+import me.ghui.v2er.widget.HackRecyclerView;
 import me.ghui.v2er.widget.LoadMoreRecyclerView;
 
 /**
@@ -26,7 +27,7 @@ public class MsgFragment extends BaseHomeFragment<MsgContract.IPresenter>
         implements MsgContract.IView, MultiItemTypeAdapter.OnItemClickListener {
 
     @BindView(R.id.base_recyclerview)
-    LoadMoreRecyclerView mRecyclerView;
+    HackRecyclerView mRecyclerView;
 
     @Inject
     LoadMoreRecyclerView.Adapter<NotificationInfo.Reply> mAdapter;
@@ -86,6 +87,10 @@ protected void init() {
         mRecyclerView.setLayoutManager(mLayoutManager = new LinearLayoutManager(getContext()));
         mRecyclerView.addDivider();
         mRecyclerView.setAdapter(mAdapter);
+        // Set AppBarTracking to fix scroll behavior on some devices
+        if (getActivity() instanceof HackRecyclerView.AppBarTracking) {
+            mRecyclerView.setAppBarTracking((HackRecyclerView.AppBarTracking) getActivity());
+        }
         mRecyclerView.setOnLoadMoreListener(willLoadPage -> mPresenter.loadMore(willLoadPage));
 
         RestoreData<NotificationInfo> restoreData = (RestoreData) getArguments().getSerializable(KEY_DATA);

app/src/main/java/me/ghui/v2er/module/home/NewsFragment.java

@@ -20,6 +20,7 @@
 import me.ghui.v2er.network.bean.TopicBasicInfo;
 import me.ghui.v2er.util.L;
 import me.ghui.v2er.util.UserUtils;
+import me.ghui.v2er.widget.HackRecyclerView;
 import me.ghui.v2er.widget.LoadMoreRecyclerView;
 
 /**
@@ -30,7 +31,7 @@ public class NewsFragment extends BaseHomeFragment<NewsContract.IPresenter> impl
         MultiItemTypeAdapter.OnItemClickListener, MainActivity.ChangeTabTypeDelegate {
 
     @BindView(R.id.base_recyclerview)
-    LoadMoreRecyclerView mRecyclerView;
+    HackRecyclerView mRecyclerView;
     @Inject
     LoadMoreRecyclerView.Adapter<NewsInfo.Item> mAdapter;
     private TabInfo mCurrentTab;
@@ -91,6 +92,10 @@ protected void init() {
         mRecyclerView.addDivider();
         mRecyclerView.setLayoutManager(mLayoutManager = new LinearLayoutManager(getContext()));
         mRecyclerView.setAdapter(mAdapter);
+        // Set AppBarTracking to fix scroll behavior on some devices
+        if (getActivity() instanceof HackRecyclerView.AppBarTracking) {
+            mRecyclerView.setAppBarTracking((HackRecyclerView.AppBarTracking) getActivity());
+        }
         mRecyclerView.setOnLoadMoreListener(willLoadPage -> {
             L.d("onLoadMore.willLoadPage: " + willLoadPage);