NestedScrollView 的 smoothScrollTo() 表现怪异 [英] NestedScrollView's smoothScrollTo() behaves weird

问题描述

我想要实现的是当 tab1(等等)被点击时滚动到 scroll_position_1 就像 这个.我根本不明白发生了什么.下面是我的布局结构.

What I am trying to achieve is to scroll to scroll_position_1 when tab1 (and so on) is clicked like this. I don't understand what's happening at all. Below is the structure of my layout.

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v4.widget.NestedScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <android.support.constraint.ConstraintLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <TextView
                android:id="@+id/scroll_position_1"
                android:layout_width="0dp"
                android:layout_height="wrap_content" />

            <TextView
                android:id="@+id/scroll_position_2"
                android:layout_width="0dp"
                android:layout_height="wrap_content" />

        </android.support.constraint.ConstraintLayout>
    </android.support.v4.widget.NestedScrollView>

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

        <android.support.design.widget.CollapsingToolbarLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layout_scrollFlags="scroll|snap">

            <ImageView
                android:layout_width="match_parent"
                android:layout_height="180dp"
                android:scaleType="centerCrop"
                app:layout_collapseMode="parallax"/>

            <android.support.v7.widget.Toolbar
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                app:layout_collapseMode="pin"
                app:popupTheme="@style/ThemeOverlay.AppCompat.Light"/>
        </android.support.design.widget.CollapsingToolbarLayout>
    </android.support.design.widget.AppBarLayout>

    <android.support.design.widget.TabLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <android.support.design.widget.TabItem
            android:layout_height="wrap_content"
            android:layout_width="wrap_content"/>

        <android.support.design.widget.TabItem
            android:layout_height="wrap_content"
            android:layout_width="wrap_content"/>
    </android.support.design.widget.TabLayout>
</android.support.design.widget.CoordinatorLayout>

这是我在点击标签时滚动但不起作用的方式:

This is how I scroll upon tab click but does not work:

mNestedScroller.smoothScrollTo(0, scroll_position_1_text_view.getY());    

而将其修改为:

mNestedScroller.scrollTo(0, scroll_position_1_text_view.getY());

工作没有问题！请帮忙.谢谢！

works without problem! Please help. Thanks!

推荐答案

在 CoordinatorLayout 中以编程方式滚动 NestedScrollView 时似乎存在错误.这解决了我的问题:

Looks like there is a bug when programmatically scrolling NestedScrollView within CoordinatorLayout. This solved my problem:

private void scrollToView(final View view) {
    mScroller.scrollBy(0, 1);
    mScroller.smoothScrollTo(0, view.getTop());
}

或者为了更好的控制:

private void scrollToView(final View view) {
    mScroller.scrollBy(0, 1);
    ObjectAnimator.ofInt(mScroller, "scrollY",  view.getTop()).setDuration(700).start();
}

这篇关于NestedScrollView 的 smoothScrollTo() 表现怪异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！