Develop Reference

onClick method inside RecyclerView not working after NestedScrollView scrolled

I checked this stackoverflow question cause it's very similar, but the Google's bug have been fixed in current versions, but I still having the problem.
I have an RecyclerView inside a NestedScrollView, after NestedScrollView scrolled if I click on item inside RecyclerView, onClick method does not work propertly.
Can anyone help me? Thanks

Okey, I found the solution here, we need:
public class FixAppBarLayoutBehavior extends AppBarLayout.Behavior {
public FixAppBarLayoutBehavior() {
super();
}
public FixAppBarLayoutBehavior(Context context, AttributeSet attrs) {
super(context, attrs);
}
#Override
public void onNestedScroll(CoordinatorLayout coordinatorLayout, AppBarLayout child, View target,
int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed, int type) {
super.onNestedScroll(coordinatorLayout, child, target, dxConsumed, dyConsumed,
dxUnconsumed, dyUnconsumed, type);
stopNestedScrollIfNeeded(dyUnconsumed, child, target, type);
}
#Override
public void onNestedPreScroll(CoordinatorLayout coordinatorLayout, AppBarLayout child,
View target, int dx, int dy, int[] consumed, int type) {
super.onNestedPreScroll(coordinatorLayout, child, target, dx, dy, consumed, type);
stopNestedScrollIfNeeded(dy, child, target, type);
}
private void stopNestedScrollIfNeeded(int dy, AppBarLayout child, View target, int type) {
if (type == ViewCompat.TYPE_NON_TOUCH) {
final int currOffset = getTopAndBottomOffset();
if ((dy < 0 && currOffset == 0)
|| (dy > 0 && currOffset == -child.getTotalScrollRange())) {
ViewCompat.stopNestedScroll(target, ViewCompat.TYPE_NON_TOUCH);
}
}
}
}
and, in our AppBarLayout:
<android.support.design.widget.AppBarLayout>
...
app:layout_behavior="your.package.FixAppBarLayoutBehavior"
...
</android.support.design.widget.AppBarLayout>

Your RecyclerView shouldn't permit nested scrolling, so it must have nestedScrollingEnabled="false"
<androidx.recyclerview.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:nestedScrollingEnabled="false"/>

BottomNavigationView is not responding to scroll events inside Coordinator Layout

I have an activity in which there is a ViewPager and the BottomNavigationView at the bottom of the page. The ViewPager consists of few fragments in it.
Below is the layout for the activity
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<include layout="#layout/toolbar_with_tab_strip_layout" />
<android.support.design.widget.CoordinatorLayout
android:id="#+id/coordinatorlayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.tf.eros.faythTv.widgets.NonScrollingViewPager
android:id="#+id/home_viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1" />
<android.support.design.widget.BottomNavigationView
android:id="#+id/bottom_navigation_home"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:background="#color/white"
app:elevation="16dp"
app:itemIconTint="#drawable/home_bottombar_icon_color_selector"
app:itemTextColor="#drawable/home_bottombar_icon_color_selector"
app:menu="#menu/bottom_navigation_main" />
</android.support.design.widget.CoordinatorLayout>
</LinearLayout>
And I have also added a BottomNavigationViewBehavior class that will be handling the hiding/unhiding of the BottomNavigationView on scrolling of the fragments in the viewpager
public class BottomNavigationViewBehavior extends CoordinatorLayout.Behavior<BottomNavigationView> {
private int height;
#Override
public boolean onLayoutChild(CoordinatorLayout parent, BottomNavigationView child, int layoutDirection) {
height = child.getHeight();
return super.onLayoutChild(parent, child, layoutDirection);
}
#Override
public boolean onStartNestedScroll(CoordinatorLayout coordinatorLayout, BottomNavigationView child, View directTargetChild, View target, int nestedScrollAxes) {
return nestedScrollAxes == ViewCompat.SCROLL_AXIS_VERTICAL;
}
#Override
public void onNestedPreScroll(CoordinatorLayout coordinatorLayout, BottomNavigationView child, View target, int dx, int dy, int[] consumed) {
if (dy > 0) {
slideDown(child);
} else if (dy < 0) {
slideUp(child);
}
}
#Override
public void onNestedScroll(CoordinatorLayout coordinatorLayout, BottomNavigationView child, View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed) {
if (dyConsumed > 0) {
slideDown(child);
} else if (dyConsumed < 0) {
slideUp(child);
}
}
private void slideUp(BottomNavigationView child) {
child.clearAnimation();
child.animate().translationY(0).setDuration(200);
}
private void slideDown(BottomNavigationView child) {
child.clearAnimation();
child.animate().translationY(height).setDuration(200);
}
}
In the Activity I have added these two lines in the onCreate Method
CoordinatorLayout.LayoutParams layoutParams = (CoordinatorLayout.LayoutParams) bottomNavigationView.getLayoutParams();
layoutParams.setBehavior(new BottomNavigationViewBehavior());
The aim is to hide the BottomNavigationView when the page is scrolled down(dy > 0) and make it visible when it is scrolled up (dy < 0).
Now the issue with the code is the hiding and unhiding of the BottomNavigationView is not spontaneous with the scrolling. Sometimes it doesn't hide at all while scrolling.

Android Support Design: BottomNavigationView

I am trying to achieve something like this https://material.google.com/components/bottom-navigation.html#bottom-navigation-behavior
But recycler view is hiding below toolbar and no effect is on BottomNavigationView
Below is my code
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context=".MainActivity">
<android.support.design.widget.AppBarLayout
android:id="#+id/app_bar_layout"
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:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light" />
</android.support.design.widget.AppBarLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.BottomNavigationView
android:id="#+id/nm_bottom"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:background="#color/colorPrimaryDark"
android:foregroundTint="#color/colorAccent"
app:itemIconTint="#android:color/white"
app:itemTextColor="#android:color/white"
app:menu="#menu/nav_menu" />
<android.support.v7.widget.RecyclerView
android:id="#+id/rv"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#id/nm_bottom"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
</RelativeLayout>
</android.support.design.widget.CoordinatorLayout>
item.xml
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:padding="4dp">
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:cardElevation="2dp">
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="?android:attr/listPreferredItemHeight"
android:padding="4dp">
<ImageView
android:id="#+id/icon"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_alignParentBottom="true"
android:layout_alignParentTop="true"
android:layout_marginRight="6dip"
android:contentDescription="TODO"
android:src="#drawable/ic_storage" />
<TextView
android:id="#+id/secondLine"
android:layout_width="fill_parent"
android:layout_height="26dip"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_toRightOf="#id/icon"
android:ellipsize="marquee"
android:text="Description"
android:textSize="12sp" />
<TextView
android:id="#+id/firstLine"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_above="#id/secondLine"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_alignWithParentIfMissing="true"
android:layout_toRightOf="#id/icon"
android:gravity="center_vertical"
android:text="Example application"
android:textSize="16sp" />
</RelativeLayout>
</android.support.v7.widget.CardView>
</FrameLayout>
public class MainActivity extends AppCompatActivity implements BottomNavigationView.OnNavigationItemSelectedListener {
private static final Logger logger = Logger.getLogger(MainActivity.class.getSimpleName());
private BottomNavigationView navigationView;
private RecyclerView mRecyclerView;
private MyAdapter mAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initViews();
}
private void initViews() {
navigationView = (BottomNavigationView) findViewById(R.id.nm_bottom);
navigationView.setOnNavigationItemSelectedListener(this);
mRecyclerView = (RecyclerView) findViewById(R.id.rv);
// use this setting to improve performance if you know that changes
// in content do not change the layout size of the RecyclerView
mRecyclerView.setHasFixedSize(true);
// use a linear layout manager
LinearLayoutManager mLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLayoutManager);
// specify an adapter (see also next example)
List<String> myDataset = new ArrayList<>();
for (int i = 0; i < 100; i++) {
myDataset.add("Index #" + i);
}
mAdapter = new MyAdapter(myDataset);
mRecyclerView.setAdapter(mAdapter);
}
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
return false;
}
}
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
private List<String> mDataset;
// Provide a reference to the views for each data item
// Complex data items may need more than one view per item, and
// you provide access to all the views for a data item in a view holder
public class ViewHolder extends RecyclerView.ViewHolder {
// each data item is just a string in this case
public TextView txtHeader;
public TextView txtFooter;
public ViewHolder(View v) {
super(v);
txtHeader = (TextView) v.findViewById(R.id.firstLine);
txtFooter = (TextView) v.findViewById(R.id.secondLine);
}
}
public void add(int position, String item) {
mDataset.add(position, item);
notifyItemInserted(position);
}
public void remove(String item) {
int position = mDataset.indexOf(item);
mDataset.remove(position);
notifyItemRemoved(position);
}
// Provide a suitable constructor (depends on the kind of dataset)
public MyAdapter(List<String> myDataset) {
mDataset = myDataset;
}
// Create new views (invoked by the layout manager)
#Override
public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
// create a new view
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_recycler_view, parent, false);
// set the view's size, margins, paddings and layout parameters
ViewHolder vh = new ViewHolder(v);
return vh;
}
// Replace the contents of a view (invoked by the layout manager)
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
// - get element from your dataset at this position
// - replace the contents of the view with that element
final String name = mDataset.get(position);
holder.txtHeader.setText(mDataset.get(position));
holder.txtHeader.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
remove(name);
}
});
holder.txtFooter.setText("Footer: " + mDataset.get(position));
}
// Return the size of your dataset (invoked by the layout manager)
#Override
public int getItemCount() {
return mDataset.size();
}
}

Edit:
Here is a simple sample showing how to implement scrolling behavior https://github.com/sjthn/BottomNavigationViewBehavior
Change your XML to this:
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context=".MainActivity">
<android.support.design.widget.AppBarLayout
android:id="#+id/app_bar_layout"
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:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"
app:title="#string/app_name" />
</android.support.design.widget.AppBarLayout>
<android.support.v7.widget.RecyclerView
android:id="#+id/rv"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
<android.support.design.widget.BottomNavigationView
android:id="#+id/nm_bottom"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/colorPrimaryDark"
android:foregroundTint="#color/colorAccent"
app:itemIconTint="#android:color/white"
app:itemTextColor="#android:color/white"
app:layout_anchor="#+id/rv"
app:layout_anchorGravity="bottom"
app:menu="#menu/nav_menu" />
</android.support.design.widget.CoordinatorLayout>

So with little help from #Srijith i am able to animate the way it is given in link.
Part of this answer is
public class BottomNavigationBehavior<V extends View> extends VerticalScrollingBehavior<V> {
private static final Interpolator INTERPOLATOR = new LinearOutSlowInInterpolator();
private int mBottomNavigationViewId;
private boolean hidden = false;
private ViewPropertyAnimatorCompat mTranslationAnimator;
private BottomNavigationView navigationView;
private View mTabsHolder;
public BottomNavigationBehavior() {
super();
}
public BottomNavigationBehavior(Context context, AttributeSet attrs) {
super(context, attrs);
mBottomNavigationViewId = R.id.nm_bottom;
}
#Override
public boolean onLayoutChild(CoordinatorLayout parent, V child, int layoutDirection) {
boolean layoutChild = super.onLayoutChild(parent, child, layoutDirection);
if (navigationView == null && mBottomNavigationViewId != View.NO_ID) {
navigationView = findTabLayout(child);
getTabsHolder();
}
return layoutChild;
}
private BottomNavigationView findTabLayout(View child) {
return (BottomNavigationView) child.findViewById(mBottomNavigationViewId);
}
#Override
public void onNestedVerticalOverScroll(CoordinatorLayout coordinatorLayout, V child, #ScrollDirection int direction, int currentOverScroll, int totalOverScroll) {
}
#Override
public void onDirectionNestedPreScroll(CoordinatorLayout coordinatorLayout, V child, View target, int dx, int dy, int[] consumed, #ScrollDirection int scrollDirection) {
handleDirection(child, scrollDirection);
}
private void handleDirection(V child, int scrollDirection) {
if (scrollDirection == ScrollDirection.SCROLL_DIRECTION_DOWN && hidden) {
hidden = false;
animateOffset(child, 0);
} else if (scrollDirection == ScrollDirection.SCROLL_DIRECTION_UP && !hidden) {
hidden = true;
animateOffset(child, child.getHeight());
}
}
#Override
protected boolean onNestedDirectionFling(CoordinatorLayout coordinatorLayout, V child, View target, float velocityX, float velocityY, #ScrollDirection int scrollDirection) {
handleDirection(child, scrollDirection);
return true;
}
private void animateOffset(final V child, final int offset) {
ensureOrCancelAnimator(child);
mTranslationAnimator.translationY(offset).start();
animateTabsHolder(offset);
}
private void animateTabsHolder(int offset) {
if (mTabsHolder != null) {
offset = offset > 0 ? 0 : 1;
ViewCompat.animate(mTabsHolder).alpha(offset).setDuration(200).start();
}
}
private void ensureOrCancelAnimator(V child) {
if (mTranslationAnimator == null) {
mTranslationAnimator = ViewCompat.animate(child);
mTranslationAnimator.setDuration(100);
mTranslationAnimator.setInterpolator(INTERPOLATOR);
} else {
mTranslationAnimator.cancel();
}
}
private void getTabsHolder() {
if (navigationView != null) {
mTabsHolder = navigationView.getChildAt(0);
}
}
public static <V extends View> BottomNavigationBehavior<V> from(V view) {
ViewGroup.LayoutParams params = view.getLayoutParams();
if (!(params instanceof CoordinatorLayout.LayoutParams)) {
throw new IllegalArgumentException("The view is not a child of CoordinatorLayout");
}
CoordinatorLayout.Behavior behavior = ((CoordinatorLayout.LayoutParams) params)
.getBehavior();
if (!(behavior instanceof BottomNavigationBehavior)) {
throw new IllegalArgumentException(
"The view is not associated with ottomNavigationBehavior");
}
return (BottomNavigationBehavior<V>) behavior;
}
public void setTabLayoutId(#IdRes int tabId) {
this.mBottomNavigationViewId = tabId;
}
}
public abstract class VerticalScrollingBehavior<V extends View> extends CoordinatorLayout.Behavior<V> {
private int mTotalDyUnconsumed = 0;
private int mTotalDy = 0;
#ScrollDirection
private int mOverScrollDirection = ScrollDirection.SCROLL_NONE;
#ScrollDirection
private int mScrollDirection = ScrollDirection.SCROLL_NONE;
public VerticalScrollingBehavior(Context context, AttributeSet attrs) {
super(context, attrs);
}
public VerticalScrollingBehavior() {
super();
}
#Retention(RetentionPolicy.SOURCE)
#IntDef({ScrollDirection.SCROLL_DIRECTION_UP, ScrollDirection.SCROLL_DIRECTION_DOWN})
public #interface ScrollDirection {
int SCROLL_DIRECTION_UP = 1;
int SCROLL_DIRECTION_DOWN = -1;
int SCROLL_NONE = 0;
}
/*
#return Overscroll direction: SCROLL_DIRECTION_UP, CROLL_DIRECTION_DOWN, SCROLL_NONE
*/
#ScrollDirection
public int getOverScrollDirection() {
return mOverScrollDirection;
}
/**
* #return Scroll direction: SCROLL_DIRECTION_UP, SCROLL_DIRECTION_DOWN, SCROLL_NONE
*/
#ScrollDirection
public int getScrollDirection() {
return mScrollDirection;
}
/**
* #param coordinatorLayout
* #param child
* #param direction Direction of the overscroll: SCROLL_DIRECTION_UP, SCROLL_DIRECTION_DOWN
* #param currentOverScroll Unconsumed value, negative or positive based on the direction;
* #param totalOverScroll Cumulative value for current direction
*/
public abstract void onNestedVerticalOverScroll(CoordinatorLayout coordinatorLayout, V child, #ScrollDirection int direction, int currentOverScroll, int totalOverScroll);
/**
* #param scrollDirection Direction of the overscroll: SCROLL_DIRECTION_UP, SCROLL_DIRECTION_DOWN
*/
public abstract void onDirectionNestedPreScroll(CoordinatorLayout coordinatorLayout, V child, View target, int dx, int dy, int[] consumed, #ScrollDirection int scrollDirection);
#Override
public boolean onStartNestedScroll(CoordinatorLayout coordinatorLayout, V child, View directTargetChild, View target, int nestedScrollAxes) {
return (nestedScrollAxes & View.SCROLL_AXIS_VERTICAL) != 0;
}
#Override
public void onNestedScrollAccepted(CoordinatorLayout coordinatorLayout, V child, View directTargetChild, View target, int nestedScrollAxes) {
super.onNestedScrollAccepted(coordinatorLayout, child, directTargetChild, target, nestedScrollAxes);
}
#Override
public void onStopNestedScroll(CoordinatorLayout coordinatorLayout, V child, View target) {
super.onStopNestedScroll(coordinatorLayout, child, target);
}
#Override
public void onNestedScroll(CoordinatorLayout coordinatorLayout, V child, View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed) {
super.onNestedScroll(coordinatorLayout, child, target, dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed);
if (dyUnconsumed > 0 && mTotalDyUnconsumed < 0) {
mTotalDyUnconsumed = 0;
mOverScrollDirection = ScrollDirection.SCROLL_DIRECTION_UP;
} else if (dyUnconsumed < 0 && mTotalDyUnconsumed > 0) {
mTotalDyUnconsumed = 0;
mOverScrollDirection = ScrollDirection.SCROLL_DIRECTION_DOWN;
}
mTotalDyUnconsumed += dyUnconsumed;
onNestedVerticalOverScroll(coordinatorLayout, child, mOverScrollDirection, dyConsumed, mTotalDyUnconsumed);
}
#Override
public void onNestedPreScroll(CoordinatorLayout coordinatorLayout, V child, View target, int dx, int dy, int[] consumed) {
super.onNestedPreScroll(coordinatorLayout, child, target, dx, dy, consumed);
if (dy > 0 && mTotalDy < 0) {
mTotalDy = 0;
mScrollDirection = ScrollDirection.SCROLL_DIRECTION_UP;
} else if (dy < 0 && mTotalDy > 0) {
mTotalDy = 0;
mScrollDirection = ScrollDirection.SCROLL_DIRECTION_DOWN;
}
mTotalDy += dy;
onDirectionNestedPreScroll(coordinatorLayout, child, target, dx, dy, consumed, mScrollDirection);
}
#Override
public boolean onNestedFling(CoordinatorLayout coordinatorLayout, V child, View target, float velocityX, float velocityY, boolean consumed) {
super.onNestedFling(coordinatorLayout, child, target, velocityX, velocityY, consumed);
mScrollDirection = velocityY > 0 ? ScrollDirection.SCROLL_DIRECTION_UP : ScrollDirection.SCROLL_DIRECTION_DOWN;
return onNestedDirectionFling(coordinatorLayout, child, target, velocityX, velocityY, mScrollDirection);
}
protected abstract boolean onNestedDirectionFling(CoordinatorLayout coordinatorLayout, V child, View target, float velocityX, float velocityY, #ScrollDirection int scrollDirection);
#Override
public boolean onNestedPreFling(CoordinatorLayout coordinatorLayout, V child, View target, float velocityX, float velocityY) {
return super.onNestedPreFling(coordinatorLayout, child, target, velocityX, velocityY);
}
#Override
public WindowInsetsCompat onApplyWindowInsets(CoordinatorLayout coordinatorLayout, V child, WindowInsetsCompat insets) {
return super.onApplyWindowInsets(coordinatorLayout, child, insets);
}
#Override
public Parcelable onSaveInstanceState(CoordinatorLayout parent, V child) {
return super.onSaveInstanceState(parent, child);
}
}
All this answer came from this guy: https://medium.com/#nullthemall/bottom-navigation-behavior-388b9b206667#.potyetdkb
Entire Project is located here

How to hide FloatingActionMenu inside CoordinatorLayout on Scroll?

Im using this great library to create a FloatingActionMenu. I use it inside a coordinator layout:
<android.support.design.widget.CoordinatorLayout
android:id="#+id/evaluations_list_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#+id/evaluations_list_textview_time"
android:layout_below="#+id/evaluations_list_textview_name"
android:importantForAccessibility="no">
<android.support.v4.widget.SwipeRefreshLayout
android:id="#+id/evaluations_list_swipe_refresh_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:importantForAccessibility="no">
<android.support.v7.widget.RecyclerView
android:id="#+id/evaluations_list_row_parent"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clipToPadding="false"
android:importantForAccessibility="no"
android:padding="10dp"
android:textColor="#color/textcolorprimary" />
</android.support.v4.widget.SwipeRefreshLayout>
<com.github.clans.fab.FloatingActionMenu
android:id="#+id/evaluations_list_floating_action_menu"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="16dp"
android:layout_marginEnd="16dp"
android:clickable="true"
android:scaleType="fitXY"
android:src="#drawable/vector_drawable_ic_add_white"
app:layout_anchor="#id/evaluations_list_row_parent"
app:layout_anchorGravity="bottom|right|end"
app:layout_behavior="my.project.views.buttons.ScrollFAMBehaviour"
app:menu_animationDelayPerItem="50"
app:menu_colorNormal="#color/primaryColorDark"
app:menu_colorPressed="#color/accentColor"
app:menu_fab_size="normal"
app:menu_openDirection="up">
<com.github.clans.fab.FloatingActionButton
android:id="#+id/evaluations_list_floating_action_button_filter"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:clickable="true"
android:scaleType="fitXY"
android:src="#drawable/vector_drawable_ic_check_white"
app:fab_colorNormal="#color/primaryColorDark"
app:fab_colorPressed="#color/accentColor"
app:fab_label="#string/fab_filter"
app:fab_size="mini" />
<com.github.clans.fab.FloatingActionButton
android:id="#+id/evaluations_list_floating_action_button_search"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:clickable="true"
android:scaleType="fitXY"
android:src="#drawable/vector_drawable_ic_search_white"
app:fab_colorNormal="#color/primaryColorDark"
app:fab_colorPressed="#color/accentColor"
app:fab_label="#string/fab_search"
app:fab_size="mini" />
</com.github.clans.fab.FloatingActionMenu>
</android.support.design.widget.CoordinatorLayout>
Now i want to create a CoordinatorLayout.Behavior to hide the complete menu when the user is scrolling down and i want it to show up again when the user is scrolling up.
Bevor i used the FloatingActionMenu i used the classic FloatingActionButton. For that it was easily possible to achieve what i want using the following code:
public class ScrollFABBehaviour extends FloatingActionButton.Behavior {
private static final Interpolator INTERPOLATOR = new FastOutSlowInInterpolator();
private boolean isAnimatingOut = false;
public ScrollFABBehaviour(Context context, AttributeSet attrs) {
super();
}
#Override
public boolean onStartNestedScroll(CoordinatorLayout coordinatorLayout, FloatingActionButton child, View directTargetChild, View target, int nestedScrollAxes) {
return nestedScrollAxes == ViewCompat.SCROLL_AXIS_VERTICAL || super.onStartNestedScroll(coordinatorLayout, child, directTargetChild, target, nestedScrollAxes);
}
#Override
public void onNestedScroll(CoordinatorLayout coordinatorLayout, FloatingActionButton child, View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed) {
super.onNestedScroll(coordinatorLayout, child, target, dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed);
if (dyConsumed > 0 && !this.isAnimatingOut && child.getVisibility() == View.VISIBLE) {
this.animateOut(child);
} else if (dyConsumed < 0 && child.getVisibility() != View.VISIBLE) {
this.animateIn(child);
}
}
private void animateOut(final FloatingActionButton button) {
ViewCompat.animate(button).scaleX(0.0F).scaleY(0.0F).alpha(0.0F).setInterpolator(INTERPOLATOR).withLayer().setListener(new ViewPropertyAnimatorListener() {
public void onAnimationStart(View view) {
ScrollFABBehaviour.this.isAnimatingOut = true;
}
public void onAnimationCancel(View view) {
ScrollFABBehaviour.this.isAnimatingOut = false;
}
public void onAnimationEnd(View view) {
ScrollFABBehaviour.this.isAnimatingOut = false;
view.setVisibility(View.GONE);
}
}).start();
}
private void animateIn(FloatingActionButton button) {
button.setVisibility(View.VISIBLE);
ViewCompat.animate(button).scaleX(1.0F).scaleY(1.0F).alpha(1.0F).setInterpolator(INTERPOLATOR).withLayer().setListener(null).start();
}
}
Unfortunately i cant use this code on the FloatingActionMenu because it is not a FloatingActionButton and also does not inherit it. It is a custom ViewGroup.
How could i create such a behavior for the FloatingActionMenu?

This behavior is really obtained by creating a CoordinatorLayout.Behavior<View>. So instead of extending from FloatingActionButton.Behavior extend from CoordinatorLayout.Behavior<FloatingActionMenu> directly.
Here is the equivalent code that will work with the FloatingActionMenu.
public class ScrollFAMBehaviour extends CoordinatorLayout.Behavior<FloatingActionMenu>{
private static final Interpolator INTERPOLATOR = new FastOutSlowInInterpolator();
private boolean isAnimatingOut = false;
public ScrollFAMBehaviour(Context context, AttributeSet attrs) {
super();
}
#Override
public boolean onStartNestedScroll(CoordinatorLayout coordinatorLayout, FloatingActionMenu child, View directTargetChild, View target, int nestedScrollAxes) {
return nestedScrollAxes == ViewCompat.SCROLL_AXIS_VERTICAL || super.onStartNestedScroll(coordinatorLayout, child, directTargetChild, target, nestedScrollAxes);
}
#Override
public void onNestedScroll(CoordinatorLayout coordinatorLayout, FloatingActionMenu child, View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed) {
super.onNestedScroll(coordinatorLayout, child, target, dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed);
if (dyConsumed > 0 && !this.isAnimatingOut && child.getVisibility() == View.VISIBLE) {
this.animateOut(child);
} else if (dyConsumed < 0 && child.getVisibility() != View.VISIBLE) {
this.animateIn(child);
}
}
private void animateOut(final FloatingActionMenu menu) {
ViewCompat.animate(menu).scaleX(0.0F).scaleY(0.0F).alpha(0.0F).setInterpolator(INTERPOLATOR).withLayer().setListener(new ViewPropertyAnimatorListener() {
public void onAnimationStart(View view) {
ScrollFAMBehaviour.this.isAnimatingOut = true;
}
public void onAnimationCancel(View view) {
ScrollFAMBehaviour.this.isAnimatingOut = false;
}
public void onAnimationEnd(View view) {
ScrollFAMBehaviour.this.isAnimatingOut = false;
view.setVisibility(View.GONE);
}
}).start();
}
private void animateIn(FloatingActionMenu menu) {
menu.setVisibility(View.VISIBLE);
ViewCompat.animate(menu).scaleX(1.0F).scaleY(1.0F).alpha(1.0F).setInterpolator(INTERPOLATOR).withLayer().setListener(null).start();
}
}

How to sync scroll of two CoordinatorLayout + AppBarLayout

I have an activity with XML.
Something like:
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<android.support.design.widget.CoordinatorLayout
android:id="#+id/coordinator"
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="#color/primary"
android:theme="#style/ToolbarStyle"
android:gravity="center_vertical"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"
app:layout_scrollFlags="scroll|enterAlways|snap"
style="#style/bold" />
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/TabLayoutStyle"
android:animateLayoutChanges="true"
app:tabGravity="fill"
app:tabMode="fixed"
app:tabTextAppearance="#style/TabStyle"/>
</android.support.design.widget.AppBarLayout>
<com.wedmegood.planner.view.XViewPager
android:id="#+id/main_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="fill_vertical"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
...
</android.support.v4.widget.DrawerLayout>
A Fragment of the ViewPager has a CoordinatorLayout and AppBarLayout + CollapsingToolbarLayout.
Fragment's XML:
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/root"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/primaryDark"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/collapse_toolbar"
android:layout_width="match_parent"
android:layout_height="#dimen/my_wedding_banner_height"
android:minHeight="48dp"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:layout_scrollFlags="scroll|exitUntilCollapsed|snap">
<RelativeLayout
android:id="#+id/banner"
android:layout_width="match_parent"
android:layout_marginTop="0dp"
android:layout_height="match_parent"
app:layout_collapseMode="none">
</RelativeLayout>
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="48dp"
android:layout_gravity="bottom"
android:animateLayoutChanges="true"
app:tabMode="fixed"
app:tabGravity="fill"
app:tabTextColor="#color/primary"
app:tabSelectedTextColor="#color/primary"
app:tabIndicatorColor="#color/accent"
app:tabIndicatorHeight="4dp"
app:tabTextAppearance="#style/TabStyle"/>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<com.wedmegood.planner.view.XViewPager
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.CoordinatorLayout>
The fragment has a banner, the RelativeLayout. I want to sync scroll of these two AppBarLayouts so that the outer AppBar collapses either before/after (doesn't matter if it happens before or after) the inside AppBar collapses? I tried setting and unsetting scroll flags of 2 AppBars depending on their Offset change listener, it kinda works but doesn't give a smooth scroll effect. I can change the fragment's XML completely as long as the banner works fine.
Also, is there a way to change style / call TabLayout's setTabTextColors when CollapsingToolbarLayout collapses/expands?

I face the same problem days ago. Finally, I found a solution from SwipeRefreshLayout. Just extend CoordinatorLayout and implement NestedScrollingChild interface. It works!
here is my code:
public class NestedCoordinatorLayout extends CoordinatorLayout implements NestedScrollingChild {
private final NestedScrollingChildHelper mNestedScrollingChildHelper;
private final int[] mParentOffsetInWindow = new int[2];
private final int[] mParentScrollConsumed = new int[2];
public NestedCoordinatorLayout(Context context) {
this(context, null, 0);
}
public NestedCoordinatorLayout(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public NestedCoordinatorLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
mNestedScrollingChildHelper = new NestedScrollingChildHelper(this);
setNestedScrollingEnabled(true);
}
// NestedScrollingChild
#Override
public void setNestedScrollingEnabled(boolean enabled) {
mNestedScrollingChildHelper.setNestedScrollingEnabled(enabled);
}
#Override
public boolean isNestedScrollingEnabled() {
return mNestedScrollingChildHelper.isNestedScrollingEnabled();
}
#Override
public boolean startNestedScroll(int axes) {
return mNestedScrollingChildHelper.startNestedScroll(axes);
}
#Override
public void stopNestedScroll() {
mNestedScrollingChildHelper.stopNestedScroll();
}
#Override
public boolean hasNestedScrollingParent() {
return mNestedScrollingChildHelper.hasNestedScrollingParent();
}
#Override
public boolean dispatchNestedScroll(int dxConsumed, int dyConsumed, int dxUnconsumed,
int dyUnconsumed, int[] offsetInWindow) {
return mNestedScrollingChildHelper.dispatchNestedScroll(dxConsumed, dyConsumed,
dxUnconsumed, dyUnconsumed, offsetInWindow);
}
#Override
public boolean dispatchNestedPreScroll(int dx, int dy, int[] consumed, int[] offsetInWindow) {
return mNestedScrollingChildHelper.dispatchNestedPreScroll(dx, dy, consumed, offsetInWindow);
}
#Override
public boolean dispatchNestedFling(float velocityX, float velocityY, boolean consumed) {
return mNestedScrollingChildHelper.dispatchNestedFling(velocityX, velocityY, consumed);
}
#Override
public boolean dispatchNestedPreFling(float velocityX, float velocityY) {
return mNestedScrollingChildHelper.dispatchNestedPreFling(velocityX, velocityY);
}
#Override
public void onNestedScrollAccepted(View child, View target, int axes) {
super.onNestedScrollAccepted(child, target, axes);
// Dispatch up to the nested parent
startNestedScroll(axes & ViewCompat.SCROLL_AXIS_VERTICAL);
}
#Override
public void onStopNestedScroll(View target) {
super.onStopNestedScroll(target);
stopNestedScroll();
}
#Override
public void onNestedScroll(View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed) {
super.onNestedScroll(target, dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed);
dispatchNestedScroll(dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed,
mParentOffsetInWindow);
}
#Override
public void onNestedPreScroll(View target, int dx, int dy, int[] consumed) {
super.onNestedPreScroll(target, dx, dy, consumed);
final int[] parentConsumed = mParentScrollConsumed;
if (dispatchNestedPreScroll(dx - consumed[0], dy - consumed[1], parentConsumed, null)) {
consumed[0] += parentConsumed[0];
consumed[1] += parentConsumed[1];
}
}
}
Use it in your fragment's layout (Inner coordinator layout).

How can I sync scroll of these 2 AppBarLayouts so that the outer
appbar collapses either before/after (doesn't matter if it happens
before or after) the inside appbar collapses?
Delete that Fragment's CoordinatorLayout and just use RelativeLayout as a root tag (for Fragment)and then do your stuffs with that ViewPager in the MainActivity.
For example, use it inside that CoordinatorLayout like this:
<CoordinatorLayout>
<android.support.v4.view.ViewPager/>
<AppbarLayout/>
<scrollableView/>
<FloatingActionButton/>
</CoordinatorLayout>
Github example:
https://github.com/TheLittleNaruto/SupportDesignExample
Or perhaps you want to scroll that ViewPager inside the NestedScrollView but, you'll face a problem then use the following code inside it:
app:layout_behavior="#string/appbar_scrolling_view_behavior"
That's pretty much it.
A fragment of the ViewPager has a CoordinatorLayout and
AppBarLayout+CollapsingToolbarLayout. XML:
You don't need to use them twice.