i want to hide bottom navigation bar so i am using bottom navigation behavior it works when i had other code but in this it seems not working i tried but bottom navigation bar won't hide Here is the code
package com.blipclap.creativegraphy.Helper;
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.design.widget.CoordinatorLayout;
import android.support.design.widget.Snackbar;
import android.support.v4.view.ViewCompat;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.View;
import static java.lang.Float.parseFloat;
public class BottomNavigationBehaviour extends CoordinatorLayout.Behavior {
public BottomNavigationBehaviour() {
}
public BottomNavigationBehaviour(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public boolean onStartNestedScroll(@NonNull CoordinatorLayout coordinatorLayout, @NonNull View child, @NonNull View directTargetChild, @NonNull View target, int axes, int type) {
return axes== ViewCompat.SCROLL_AXIS_VERTICAL;
}
@Override
public void onNestedScroll(@NonNull CoordinatorLayout coordinatorLayout, @NonNull View child, @NonNull View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed, int type) {
super.onNestedScroll(coordinatorLayout, child, target, dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed, type);
child.setTranslationY(Math.max(0f,
Math.min(Float.parseFloat(String.valueOf(child.getHeight())),child.getTranslationY()+dyConsumed)));
}
@Override
public boolean layoutDependsOn(CoordinatorLayout parent, View child, View dependency) {
if (dependency instanceof Snackbar.SnackbarLayout)
updateSnackbar(child,dependency);
return super.layoutDependsOn(parent, child, dependency);
}
private void updateSnackbar(View child, View dependency) {
if (dependency.getLayoutParams()instanceof CoordinatorLayout.LayoutParams) {
CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) dependency.getLayoutParams();
params.setAnchorId(child.getId());
params.anchorGravity= Gravity.TOP;
params.gravity=Gravity.TOP;
dependency.setLayoutParams(params);
}
}
}
this is my layout content layout i tried changing relative layout but app unfortunately stops so i can't change it
<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:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.blipclap.creativegraphy.HomeActivity"
tools:showIn="@layout/app_bar_home">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@android:color/white">
<android.support.design.widget.TabLayout
android:id="@+id/tabLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"></android.support.design.widget.TabLayout>
<android.support.v4.view.ViewPager
android:id="@+id/viewPager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layoutManager="android.support.v7.widget.LinearLayoutManager"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
android:layout_above="@+id/navigation"
android:layout_below="@+id/tabLayout"></android.support.v4.view.ViewPager>
<android.support.design.widget.BottomNavigationView
android:id="@+id/navigation"
android:layout_gravity="bottom"
app:layout_behavior=".Helper.BottomNavigationBehavior"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:background="@color/colorPrimary"
app:itemIconTint="@android:color/background_dark"
app:itemTextColor="@android:color/background_dark"
app:menu="@menu/bottom_navigation_menu"></android.support.design.widget.BottomNavigationView>
</RelativeLayout>
</android.support.design.widget.CoordinatorLayout>
this are my 3 fragments i am using when i scroll bottom navigation bar does not hide Category
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context="com.blipclap.creativegraphy.Fragment.CategoryFragment">
<android.support.v7.widget.RecyclerView
android:id="@+id/recycler_category"
app:layoutManager="android.support.v7.widget.LinearLayoutManager"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
android:layout_width="match_parent"
android:layout_height="match_parent"></android.support.v7.widget.RecyclerView>
</RelativeLayout>
daily popular
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context="com.blipclap.creativegraphy.Fragment.CategoryFragment">
<android.support.v7.widget.RecyclerView
android:id="@+id/recycler_trending"
app:layoutManager="android.support.v7.widget.LinearLayoutManager"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
android:layout_width="match_parent"
android:layout_height="match_parent"></android.support.v7.widget.RecyclerView>
</RelativeLayout>
recent
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context="com.blipclap.creativegraphy.Fragment.CategoryFragment">
<android.support.v7.widget.RecyclerView
android:id="@+id/recycler_recent"
app:layoutManager="android.support.v7.widget.LinearLayoutManager"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
android:layout_width="match_parent"
android:layout_height="match_parent"></android.support.v7.widget.RecyclerView>
</RelativeLayout>
this code is not working for me what should i do any solution
refrence
bottom navigation behavior reference 1
bottom navigation behavior reference 2
bottom navigation behavior reference 3
i followed the last one but its not working
There are two things:
1) You should not override onNestedScroll, it should be onNestedPreScroll, delete onNestedScroll and replace it with that:
@Override
public void onNestedPreScroll(@NonNull CoordinatorLayout coordinatorLayout, @NonNull View child, @NonNull View target, int dx, int dy, @NonNull int[] consumed, int type) {
super.onNestedPreScroll(coordinatorLayout, child, target, dx, dy, consumed, type);
child.setTranslationY(Math.max(0f,
Math.min(Float.parseFloat(String.valueOf(child.getHeight())),child.getTranslationY()+dy)));
}
2) In your XML file, you put
app:layout_behavior=".Helper.BottomNavigationBehavior"
And your class name is
BottomNavigationBehaviour
As you can see one is Behaviour, and the other is Behavior, normally it should throw a runtime error, and the app shouldn't be able to run, it may be a typo on your part, but I mentioned it just in case.
But be aware that this code has a bug, if you try to scroll all the way down or up, the RecyclerView item will not be clickable for a couple of seconds, I have a similar bug. For now, my choice is to use animation to hide the BottomNavigationView as explained in this post.
EDIT:
It's possible that the behaviour is not applied because BottomNavigationView is not a direct child of CoordinatorLayout, so you can either delete the RelativeLayout entirely or take the BottomNavigationView out:
<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:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.blipclap.creativegraphy.HomeActivity"
tools:showIn="@layout/app_bar_home">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@android:color/white">
<android.support.design.widget.TabLayout
android:id="@+id/tabLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"></android.support.design.widget.TabLayout>
<android.support.v4.view.ViewPager
android:id="@+id/viewPager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layoutManager="android.support.v7.widget.LinearLayoutManager"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
android:layout_above="@+id/navigation"
android:layout_below="@+id/tabLayout"></android.support.v4.view.ViewPager>
</RelativeLayout>
<android.support.design.widget.BottomNavigationView
android:id="@+id/navigation"
android:layout_gravity="bottom"
app:layout_behavior=".Helper.BottomNavigationBehavior"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:background="@color/colorPrimary"
app:itemIconTint="@android:color/background_dark"
app:itemTextColor="@android:color/background_dark"
app:menu="@menu/bottom_navigation_menu">
</android.support.design.widget.BottomNavigationView>
</android.support.design.widget.CoordinatorLayout>
BottomLayoutBehavior.java
package com.utility.behaviour;
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import androidx.annotation.NonNull;
import androidx.coordinatorlayout.widget.CoordinatorLayout;
import androidx.core.view.ViewCompat;
public class BottomLayoutBehavior<V extends View> extends CoordinatorLayout.Behavior<V> {
public BottomLayoutBehavior(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public boolean onStartNestedScroll(@NonNull CoordinatorLayout coordinatorLayout, @NonNull V child,
@NonNull View directTargetChild, @NonNull View target, int axes, int type) {
return axes == ViewCompat.SCROLL_AXIS_VERTICAL;
}
@Override
public void onNestedPreScroll(@NonNull CoordinatorLayout coordinatorLayout, @NonNull V child,
@NonNull View target, int dx, int dy, @NonNull int[] consumed, int type) {
child.setTranslationY(Math.max(0f, Math.min(child.getHeight(), child.getTranslationY() + dy)));
super.onNestedPreScroll(coordinatorLayout, child, target, dx, dy, consumed, type);
}
}
activity_main.xml
<androidx.coordinatorlayout.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.appbar.AppBarLayout
android:id="@+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<include layout="@layout/app_bar" />
</com.google.android.material.appbar.AppBarLayout>
<com.utility.viewpager.SwipeOnOffViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="@+id/bnvHome"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:background="@color/white"
app:itemIconTint="@color/home_tab_bg"
app:itemTextColor="@color/home_tab_bg"
app:labelVisibilityMode="labeled"
app:layout_anchorGravity="center"
app:layout_behavior="com.utility.behaviour.BottomLayoutBehavior"
app:menu="@menu/home_bottom_navigation_items" />
<!--app:itemBackground="@drawable/home_bottom_bar_gap"-->
</androidx.coordinatorlayout.widget.CoordinatorLayout>
NB: android:layout_gravity="bottom" & app:layout_behavior="com.utility.behaviour.BottomLayoutBehavior" is mandatory.
来源：https://stackoverflow.com/questions/50495852/when-scroll-bottom-navigation-bar-does-not-hide-bottomnavigationbehavior