ViewPager2滑動沖突的解決方法

ViewPager2滑動沖突解決,供大傢參考,具體內容如下

本文章對ViewPager2的滑動沖突沒有提供完善的解決方案,僅為鞏固解決滑動沖突方面的知識

首先看看沒有解決滑動沖突時寫的demo:

MainActivity.java

package com.example.banner

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.viewpager2.widget.ViewPager2

class MainActivity : AppCompatActivity() {
 override fun onCreate(savedInstanceState: Bundle?) {
 super.onCreate(savedInstanceState)
 setContentView(R.layout.activity_main)
 val viewPager2 = findViewById<ViewPager2>(R.id.viewpager2outside)
 val myAdapter = OutsideAdapter()
 viewPager2.adapter = myAdapter
 }
}

InnerAdapter

package com.example.banner

import android.graphics.Color
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.TextView
import androidx.recyclerview.widget.RecyclerView

class InnerAdapter : RecyclerView.Adapter<InnerAdapter.PagerViewHolder>() {
 private var mList: List<Int> = ArrayList()
 override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): PagerViewHolder {
 val itemView = LayoutInflater.from(parent.context).inflate(R.layout.item_page, parent, false)
 return PagerViewHolder(itemView)
 }

 override fun onBindViewHolder(holder: PagerViewHolder, position: Int) {
 holder.bindData(mList[position])
 }

 fun setList(list: List<Int>) {
 mList = list
 }

 override fun getItemCount(): Int {
 return mList.size
 }
 // ViewHolder需要繼承RecycleView.ViewHolder
 class PagerViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
 private val mTextView: TextView = itemView.findViewById(R.id.tv_text)
 private var colors = arrayOf("#41F1E5","#8D41F1","#FF99CC","#41F1E5")

 fun bindData(i: Int) {
  mTextView.text = i.toString()
  mTextView.setBackgroundColor(Color.parseColor(colors[i]))
 }
 }
}

OutsideAdapter

package com.example.banner

import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.recyclerview.widget.RecyclerView
import androidx.viewpager2.widget.ViewPager2

class OutsideAdapter() : RecyclerView.Adapter<OutsideAdapter.PagerViewHolder>() {
 class PagerViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
 private val mPagerView: ViewPager2 = itemView.findViewById(R.id.viewpager2inner)
 fun bindData() {
  val data = listOf(0, 1, 2, 3)
  val myAdapter = InnerAdapter()
  myAdapter.setList(data)
  mPagerView.adapter = myAdapter
 }
 }

 override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): PagerViewHolder {
 val itemView = LayoutInflater.from(parent.context).inflate(R.layout.item_outside, parent, false)
 return PagerViewHolder(itemView)
 }

 override fun onBindViewHolder(holder: PagerViewHolder, position: Int) {
 holder.bindData()
 }

 override fun getItemCount(): Int = 2

}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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"
 tools:context=".MainActivity">

 <androidx.viewpager2.widget.ViewPager2
 android:id="@+id/viewpager2outside"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:overScrollMode="never"
 app:layout_constraintBottom_toBottomOf="parent"
 app:layout_constraintLeft_toLeftOf="parent"
 app:layout_constraintRight_toRightOf="parent"
 app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

item_outside.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:orientation="vertical">

 <androidx.viewpager2.widget.ViewPager2
 android:id="@+id/viewpager2inner"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:overScrollMode="never"
 app:layout_constraintBottom_toBottomOf="parent"
 app:layout_constraintLeft_toLeftOf="parent"
 app:layout_constraintRight_toRightOf="parent"
 app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

item_page.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:gravity="center">

 <TextView
 android:id="@+id/tv_text"
 android:background="#0000ff"
 android:gravity="center"
 android:layout_centerHorizontal="true"
 android:layout_width="match_parent"
 android:layout_height="280dp"
 android:textColor="#ffffff"
 android:textSize="82sp" />
</RelativeLayout>

效果如下:

如果解決瞭滑動沖突應該在TextView對應的區域滑動時應該能從0滑動到1,而導致圖中效果的原因是因為外層的ViewPager2攔截瞭橫向的滑動事件,因為ViewPager2是final不能繼承,所以我們給它套一層父ViewGroup來解決滑動沖突問題,這裡我是在外面的ViewPager2裡面放瞭倆個ViewPager2 我想做到的是從第一個裡面的Vp2(ViewPager2)0劃到1再到2到3再到裡面的第二個Vp2的0再到1再到2再到3,而不是直接從第一個裡面的Vp2(ViewPager2)0滑倒裡面的第二個Vp2的0。

下面上源碼,隻上有改動的代碼,像MainActivity及activity_main.xml等沒有改動就不再上瞭

ViewPager2Container

package com.example.banner

import android.content.Context
import android.util.AttributeSet
import android.view.MotionEvent
import android.widget.RelativeLayout
import androidx.viewpager2.widget.ViewPager2

class ViewPager2Container @JvmOverloads constructor(context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0) : RelativeLayout(context, attrs, defStyleAttr) {
 private lateinit var mViewPager2: ViewPager2

 override fun onFinishInflate() {
 super.onFinishInflate()
 for (i in 0 until childCount) {
  val childView = getChildAt(i)
  if (childView is ViewPager2) {
  mViewPager2 = childView
  break
  }
 }
 }

 override fun onInterceptTouchEvent(ev: MotionEvent): Boolean {
 when (ev.action) {
  //不能讓父View攔截事件否則父View會攔截接下來的一系列事件
  MotionEvent.ACTION_DOWN -> {
  parent.requestDisallowInterceptTouchEvent(true)
  }
  MotionEvent.ACTION_MOVE -> {
  if(mViewPager2.currentItem!=mViewPager2.adapter!!.itemCount-1){
   parent.requestDisallowInterceptTouchEvent(true)
  }else{
   parent.requestDisallowInterceptTouchEvent(false)
  }
  }
 }
 return super.onInterceptTouchEvent(ev)
 }
}

item_outside.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:orientation="vertical">

 <com.example.banner.ViewPager2Container
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 app:layout_constraintTop_toTopOf="parent">

 <androidx.viewpager2.widget.ViewPager2
  android:id="@+id/viewpager2inner"
  android:layout_width="match_parent"
  android:layout_height="280dp"
  android:overScrollMode="never" />
 </com.example.banner.ViewPager2Container>


</androidx.constraintlayout.widget.ConstraintLayout>

當然我這樣寫還是有些東西沒有考慮到的,我這裡的解決方案僅提供一種解決思路,不去考慮很完善的解決方案

對於我上面寫的代碼,在滑到裡面的第二個vp2的3時再向左滑動時會直接滑到裡面的第一個vp2,具體怎麼解決很簡單

我這裡的解決方案僅提供一種解決思路,主要是鞏固怎麼解決滑動沖突方面的知識!

最後上效果圖

以上就是本文的全部內容,希望對大傢的學習有所幫助,也希望大傢多多支持WalkonNet。