android - 在 NestedScrollView 内拖动滚动条

问题描述

一段时间以来，当 recyclerview/Nestedscrollview 放入 NestedSCrollView 时，我遇到了滚动条问题。但是我知道在另一个滚动布局中使用滚动布局并不是一个好习惯，但必须在我的一个应用程序中解决这个问题。

即，当您尝试通过拖动垂直滚动条来滚动列表时，它会在几个像素后滚动中断。尝试了所有但没有成功。

这是测试布局

<?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:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".TestingScrollbars">

    <android.support.design.widget.AppBarLayout
            android:layout_width="match_parent"
            android:layout_height="200dp"
            app:expanded="false"
            android:theme="@style/AppTheme.AppBarOverlay">

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

            <android.support.v7.widget.Toolbar
                    android:id="@+id/toolbar"
                    android:gravity="bottom"
                    android:layout_width="match_parent"
                    android:layout_height="?attr/actionBarSize"
                    android:background="?attr/colorPrimary"
                    app:popupTheme="@style/AppTheme.PopupOverlay"/>

        </android.support.design.widget.CollapsingToolbarLayout>


    </android.support.design.widget.AppBarLayout>

    <android.support.constraint.ConstraintLayout
            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=".TestingScrollbars"
            tools:showIn="@layout/activity_main">

        <android.support.v4.widget.NestedScrollView
                android:layout_gravity="bottom|end"
                android:layout_margin="@dimen/fab_margin"
                android:layout_width="match_parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent"
                app:layout_constraintStart_toEndOf="parent"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintVertical_bias="0"
                android:layout_height="wrap_content">
            <RelativeLayout android:layout_width="match_parent"
                            android:layout_height="wrap_content">

                <TextView android:id="@+id/tv"
                          android:layout_width="match_parent"
                          android:layout_height="400dp"
                          android:gravity="center"
                          android:text="testing"/>
                <android.support.v7.widget.RecyclerView
                        android:id="@+id/recyclerview"
                        android:layout_below="@+id/tv"
                        android:scrollbars="vertical"
                        android:fadeScrollbars="false"
                        android:nestedScrollingEnabled="true"
                        android:layout_width="wrap_content"
                        android:padding="15dp"
                        app:layout_constraintStart_toStartOf="parent"
                        app:layout_constraintTop_toTopOf="parent"
                        app:layout_constraintStart_toEndOf="parent"
                        app:layout_constraintBottom_toBottomOf="parent"
                        app:layout_constraintVertical_bias="0"
                        android:layout_height="wrap_content">
                </android.support.v7.widget.RecyclerView>

            </RelativeLayout>

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

    </android.support.constraint.ConstraintLayout>
</android.support.design.widget.CoordinatorLayout>

活动.kt

package com.example.testingscrollbars

import android.os.Bundle
import android.support.design.widget.Snackbar
import android.support.v7.app.AppCompatActivity
import android.support.v7.widget.LinearLayoutManager
import android.support.v7.widget.RecyclerView
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.TextView
import kotlinx.android.synthetic.main.activity_main.*

class TestingScrollbars : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        setSupportActionBar(toolbar)
        val recyclerView = findViewById<RecyclerView>(R.id.recyclerview)
        recyclerView.layoutManager = LinearLayoutManager(this)
        recyclerView.adapter = CustomAdapter(getAdapterList())
        recyclerView.isVerticalScrollBarEnabled = true
    }

    private fun getAdapterList(): List<Item> {
        val list = ArrayList<Item>()
        list.add(Item("first pri. text", "first sec. text"))
        list.add(Item("second pri. text", "second sec. text"))
        list.add(Item("third pri. text", "third sec. text"))
        list.add(Item("something1 pri. text", "something1 sec. text"))
        list.add(Item("something2 pri. text", "something2 sec. text"))
        list.add(Item("something3 pri. text", "something3 sec. text"))
        list.add(Item("something4 pri. text", "something4 sec. text"))
        list.add(Item("something5 pri. text", "something5 sec. text"))
        list.add(Item("something6 pri. text", "something6 sec. text"))
        list.add(Item("something7 pri. text", "something7 sec. text"))
        list.add(Item("something8 pri. text", "something8 sec. text"))
        list.add(Item("something9 pri. text", "something9 sec. text"))
        list.add(Item("something10 pri. text", "something10 sec. text"))
        list.add(Item("something11 pri. text", "something11 sec. text"))
        list.add(Item("something12 pri. text", "something12 sec. text"))
        list.add(Item("something13 pri. text", "something13 sec. text"))
        list.add(Item("something14 pri. text", "something14 sec. text"))
        list.add(Item("something15 pri. text", "something15 sec. text"))
        return list
    }

    class Item(val primary: String, val secondary: String)

    class CustomAdapter(val list: List<Item>) : RecyclerView.Adapter<ViewHolder>() {


        override fun onBindViewHolder(p0: ViewHolder, p1: Int) {
            p0.tvPrimary.text = list[p1].primary
            p0.tvSecondary.text = list[p1].secondary
        }

        override fun onCreateViewHolder(p0: ViewGroup, p1: Int): ViewHolder =
            ViewHolder(LayoutInflater.from(p0.context).inflate(R.layout.recycler_item, p0, false))

        override fun getItemCount(): Int = list.size

    }

    class ViewHolder(view: View) : RecyclerView.ViewHolder(view) {
        val tvPrimary = view.findViewById<TextView>(R.id.tv_primary)
        val tvSecondary = view.findViewById<TextView>(R.id.tv_Secondary)
    }
}

标签： androidandroid-recyclerviewsmooth-scrollingandroid-nestedscrollview

android - 在 NestedScrollView 内拖动滚动条

问题描述

解决方案

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