如何在RecyclerView滚动时上下滚动底部栏 [英] How to scroll up/down of bottom bar on scrolling of RecyclerView
本文介绍了如何在RecyclerView滚动时上下滚动底部栏的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
在Google最近发布的设计支持库中，引入了一些很酷的新视图.使用某些新组件(例如CoordinatorLayout)可以(！)使您实现滚动行为.
With Google’s recent release of the Design Support Library several cool new views have been introduced. Using some of the new components (e.g. CoordinatorLayout ) might (!) enable you to achieve the scrolling behavior.
我尝试了一些内置的滚动行为，但没有任何效果对我有用，
I was tryed with some built in scrolling behavior but nothing is working for me,
我的布局中有一个bottombar(LinearLayout)代替了FloatingActionButton
I have a bottombar(LinearLayout) in my layout in place of FloatingActionButton
这就是我想要的.
- 该屏幕底部栏的OnLaunch应该出现.
- 在"recyclerview"滚动条上，底部滚动条应向下滚动.
- 在recyclerview底部滚动时，应向上滚动
有没有内置的机制来实现这一目标?还是我们需要编写Java代码?
Is there any builtin mechanism to achieve this ? or We need write java code?
这是我的代码:
main_activty.xml
main_activty.xml
<android.support.design.widget.CoordinatorLayout 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:fitsSystemWindows="true">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
<include layout="@layout/toolbar_srp" />
<android.support.design.widget.TabLayout
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:elevation="5dp"
app:tabGravity="fill"
app:tabIndicatorColor="@android:color/white"
app:tabMode="fixed" />
</android.support.design.widget.AppBarLayout>
<!-- All Scrollable Views -->
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
<!-- Bottom bar-->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:background="#a0000000"
android:orientation="horizontal"
android:paddingBottom="@dimen/padding_small"
android:paddingTop="@dimen/padding_small">
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.33"
android:gravity="center"
android:paddingBottom="@dimen/padding_small"
android:paddingTop="@dimen/padding_small"
android:text="AC"
android:textColor="@color/white" />
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.33"
android:gravity="center"
android:paddingBottom="@dimen/padding_small"
android:paddingTop="@dimen/padding_small"
android:text="Sleeper"
android:textColor="@color/white" />
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.33"
android:gravity="center"
android:paddingBottom="@dimen/padding_small"
android:paddingTop="@dimen/padding_small"
android:text="Premium"
android:textColor="@color/white" />
</LinearLayout>
</android.support.design.widget.CoordinatorLayout>
fragment.xml(在这里放入了recyclerview代码)
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/white"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:paddingBottom="@dimen/padding_small"
android:paddingTop="@dimen/padding_small"
android:weightSum="1">
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.33"
android:background="@drawable/bg_srp_sorter"
android:clickable="true"
android:gravity="center"
android:paddingBottom="@dimen/padding_small"
android:paddingTop="@dimen/padding_small"
android:text="Departure" />
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.33"
android:background="@drawable/bg_srp_sorter"
android:gravity="center"
android:paddingBottom="@dimen/padding_small"
android:paddingTop="@dimen/padding_small"
android:text="Duration" />
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.33"
android:gravity="center"
android:paddingBottom="@dimen/padding_small"
android:paddingTop="@dimen/padding_small"
android:text="Price" />
</LinearLayout>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="@color/lite_gray"></View>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:weightSum="1">
<android.support.v7.widget.RecyclerView
android:id="@+id/bus_list_recycler_view"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" />
</LinearLayout>
</LinearLayout>
toolbar.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
android:minHeight="?attr/actionBarSize">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:weightSum="1">
<LinearLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.10">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/abc_ic_ab_back_mtrl_am_alpha" />
</LinearLayout>
<LinearLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.78"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:weightSum="1">
<TextView
android:id="@+id/toolbar_title_source"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.47"
android:ellipsize="end"
android:singleLine="true"
android:text="Thiruvananthapuram "
android:textColor="@color/white"
android:textSize="@dimen/label_text_size_large" />
<TextView
android:id="@+id/toolbar_title_arrow"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.08"
android:text="@string/char_right"
android:textColor="@color/white"
android:textSize="@dimen/label_text_size_large"
android:textStyle="bold" />
<TextView
android:id="@+id/toolbar_title_destination"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.47"
android:ellipsize="end"
android:singleLine="true"
android:text=" Cochin"
android:textColor="@color/white"
android:textSize="@dimen/label_text_size_large" />
</LinearLayout>
<TextView
android:id="@+id/toolbar_sub_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2 Seat(s)"
android:textColor="@color/lite_gray"
android:textSize="@dimen/label_text_size_normal" />
</LinearLayout>
<LinearLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.13">
<ImageView
android:layout_width="30dp"
android:layout_height="30dp"
android:scaleType="fitCenter"
android:src="@drawable/filter" />
</LinearLayout>
</LinearLayout>
</android.support.v7.widget.Toolbar>
推荐答案
由于使用的是CoordinatorLayout，因此您可以创建一个自定义的Behaviour，该实现可以实现您所要求的以下示例:
create一个extends CoordinatorLayout.Behavior<View>遵循以下示例的类:
since you are using CoordinatorLayout you could create a custom Behaviour that can achieve what you requested follow example below:
create a class that extends CoordinatorLayout.Behavior<View> follow example below:
public class QuickReturnFloaterBehavior extends CoordinatorLayout.Behavior<View> {
private int distance;
public QuickReturnFloaterBehavior(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public boolean onStartNestedScroll(CoordinatorLayout coordinatorLayout, View child, View directTargetChild, View target, int nestedScrollAxes) {
return (nestedScrollAxes & ViewCompat.SCROLL_AXIS_VERTICAL) != 0;
}
@Override public void onNestedPreScroll(CoordinatorLayout coordinatorLayout, View child, View target, int dx, int dy, int[] consumed) {
if (dy > 0 && distance < 0 || dy < 0 && distance > 0) {
child.animate().cancel();
distance = 0;
}
distance += dy;
final int height = child.getHeight() > 0 ? (child.getHeight()) : 600/*update this accordingly*/;
if (distance > height && child.isShown()) {
hide(child);
} else if (distance < 0 && !child.isShown()) {
show(child);
}
}
private void hide(View view) {
view.setVisibility(View.GONE);// use animate.translateY(height); instead
}
private void show(View view) {
view.setVisibility(View.VISIBLE);// use animate.translateY(-height); instead
}
}
现在要应用此behaviour将此添加到您的布局
now to apply this behaviour add this to your layout
app:layout_behavior="com.example.QuickReturnFloaterBehavior"
这篇关于如何在RecyclerView滚动时上下滚动底部栏的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
