我想隐藏底部导航栏,所以我使用底部的导航行为,它工作时,我有其他的代码,但在这个似乎不工作我试过,但底部导航栏不会隐藏下面是代码
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);
}
}
}
这是我的布局内容布局我试图改变相对布局,但不幸的是应用程序停止,所以我不能改变它
<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>
这是我的3个片段,我使用我时滚动底部导航栏不隐藏类别
<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>
每日热门
<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>
最近
<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>
这个代码是不是为我工作我应该怎么做任何解决方案
参考
bottom navigation behavior reference 1
bottom navigation behavior reference 2
bottom navigation behavior reference 3
我跟着最后一个,但它不工作
有两件事情:
1)你不应该重写onNestedScroll
,它应该是onNestedPreScroll
,删除onNestedScroll
并与更换:
@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)在你的XML文件,你把
app:layout_behavior=".Helper.BottomNavigationBehavior"
而你的类名是
BottomNavigationBehaviour
正如你可以看到一个是行为,而另一种是行为,通常应该抛出一个运行时错误,应用程序应该能够运行,它可能是你一个错字,但我只是在情况下提到。
但要注意,这个代码有缺陷,如果你尝试所有的方式滚动向上或向下,则RecyclerView
项目将无法点击了几秒钟,我有一个similar bug。现在,我的选择是使用动画来隐藏BottomNavigationView
在this后解释。
编辑:
这有可能是该行为不适用,因为BottomNavigationView
不是CoordinatorLayout
的直接孩子,所以你可以完全删除RelativeLayout
或采取BottomNavigationView
出来:
<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>
bottom layout behavior.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中
<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>
注:android:layout_gravity="bottom"
&app:layout_behavior="com.utility.behaviour.BottomLayoutBehavior"
是强制性的。