Hiding the ActionBar on RecyclerView/ListView onScroll

Question

In my application I got an activity with some kind of actionbar at the top and the listview below it. What I want to do - is to scroll it UP with the list, so it hides and then, when the list is being scrolled down - it should scroll down with the list, like it was just over the upper screen border. how can i achieve this functionality?

Answer 1

Updated 6/3/2015:

Google now supports this using the CoordinatorLayout.

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/main_content"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
            app:layout_scrollFlags="scroll|enterAlways" />

        <android.support.design.widget.TabLayout
            android:id="@+id/tabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />

    </android.support.design.widget.AppBarLayout>

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="end|bottom"
        android:layout_margin="@dimen/fab_margin"
        android:src="@drawable/ic_done" />

</android.support.design.widget.CoordinatorLayout>

Source: https://github.com/chrisbanes/cheesesquare/blob/master/app/src/main/res/layout/include_list_viewpager.xml

Documented here: https://developer.android.com/reference/android/support/design/widget/AppBarLayout.html

Original Answer:

Example similar to Google Play Music and Umano apps:

https://github.com/umano/AndroidSlidingUpPanel

Take a look at the code in this repository. As you slide the panel up, the ActionBar slides up as well.

From the Demo:

   getWindow().requestFeature(Window.FEATURE_ACTION_BAR_OVERLAY);

   SlidingUpPanelLayout layout = (SlidingUpPanelLayout) findViewById(R.id.sliding_layout);
    layout.setShadowDrawable(getResources().getDrawable(R.drawable.above_shadow));
    layout.setAnchorPoint(0.3f);
    layout.setPanelSlideListener(new PanelSlideListener() {
        @Override
        public void onPanelSlide(View panel, float slideOffset) {
            Log.i(TAG, "onPanelSlide, offset " + slideOffset);
            if (slideOffset < 0.2) {
                if (getActionBar().isShowing()) {
                    getActionBar().hide();
                }
            } else {
                if (!getActionBar().isShowing()) {
                    getActionBar().show();
                }
            }
        }

        @Override
        public void onPanelExpanded(View panel) {
            Log.i(TAG, "onPanelExpanded");

        }

        @Override
        public void onPanelCollapsed(View panel) {
            Log.i(TAG, "onPanelCollapsed");

        }

        @Override
        public void onPanelAnchored(View panel) {
            Log.i(TAG, "onPanelAnchored");

        }
    });

Download example here:

https://play.google.com/store/apps/details?id=com.sothree.umano

ListView - without Libraries:

I recently wanted the same functionality and this works perfectly for me:

As the user scrolls upward, the ActionBar will be hidden in order to give the user the entire screen to work work with.

As the user scrolls downward and lets go, the ActionBar will return.

getWindow().requestFeature(Window.FEATURE_ACTION_BAR_OVERLAY);

listView.setOnScrollListener(new OnScrollListener() {
    int mLastFirstVisibleItem = 0;

    @Override
    public void onScrollStateChanged(AbsListView view, int scrollState) {   }           

    @Override
    public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {    
        if (view.getId() == listView.getId()) {
            final int currentFirstVisibleItem = listView.getFirstVisiblePosition();

            if (currentFirstVisibleItem > mLastFirstVisibleItem) {
                // getSherlockActivity().getSupportActionBar().hide();
                getSupportActionBar().hide();
            } else if (currentFirstVisibleItem < mLastFirstVisibleItem) {
                // getSherlockActivity().getSupportActionBar().show();
                getSupportActionBar().show();
            }

            mLastFirstVisibleItem = currentFirstVisibleItem;
        }               
    }
});

RecyclerView - without libraries

    this.mRecyclerView.setOnScrollListener(new RecyclerView.OnScrollListener() {
        int mLastFirstVisibleItem = 0;

        @Override
        public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
        }

        @Override
        public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
            super.onScrolled(recyclerView, dx, dy);
            final int currentFirstVisibleItem = mLinearLayoutManager.findFirstVisibleItemPosition();

            if (currentFirstVisibleItem > this.mLastFirstVisibleItem) {
                MainActivity.this.getSupportActionBar().hide();
            } else if (currentFirstVisibleItem < this.mLastFirstVisibleItem) {
                MainActivity.this.getSupportActionBar().show();
            }

            this.mLastFirstVisibleItem = currentFirstVisibleItem;
        }
    });

Let me know if you need anymore help!

Answer 2

You experience the flickering since by hiding/showing the ActionBar the available space for your content layout changes, which causes a relayout. With this the index of the first visible item's position changes as well (you can verify this by logging out mLastFirstVisibleItem and currentFirstVisibleItem.

You can cope with the flickering by letting the ActionBar overlay your content layout. To enable overlay mode for the action bar, you need to create a custom theme that extends an existing action bar theme and set the android:windowActionBarOverlay property to true.

With this you can eliminate the flickering but the action bar will overlay your listview's content. An easy solution to this is to set the listview's (or the root layout's) top padding to the action bar's height.

<ListView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingTop="?android:attr/actionBarSize" />

Unfortunately this will result in a constant padding at the top. A refinement of this solution is to add a header view to the list view which has the height of ?android:attr/actionBarSize (and remove the top padding set previously)