ViewPager2

ViewPager2

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android - 在Android中使用ViewPager2

我开始了解ViewPager2并尝试实现它，但没有找到任何合适的示例。

谁能告诉我如何使用它。

我在寻找提示，而不是示例。

最佳答案

更新7

检查：Migrate from ViewPager to ViewPager2

检查：Create swipe views with tabs using ViewPager2

更新6

查看my answer if you want to implement Carousel using View Pager2

更新5


  如何在ViewPager2中使用TabLayout


样本代码

在dependencies以下使用

implementation 'com.google.android.material:material:1.1.0-alpha08'
implementation 'androidx.viewpager2:viewpager2:1.0.0-beta02'


样本代码


  XMl布局


<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.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">

    <com.google.android.material.appbar.AppBarLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

        <androidx.appcompat.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:background="?attr/colorPrimary"
                app:layout_scrollFlags="scroll|enterAlways"
                app:popupTheme="@style/ThemeOverlay.AppCompat.Light"/>

        <com.google.android.material.tabs.TabLayout
                android:id="@+id/tabs"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"/>
    </com.google.android.material.appbar.AppBarLayout>

    <androidx.viewpager2.widget.ViewPager2
            android:id="@+id/viewpager"
            app:layout_anchor="@id/tabs"
            app:layout_anchorGravity="bottom"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
    />


</androidx.coordinatorlayout.widget.CoordinatorLayout>



  活动


import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import kotlinx.android.synthetic.main.activity_main.*
import com.google.android.material.tabs.TabLayoutMediator

import com.google.android.material.tabs.TabLayout


class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

//        setSupportActionBar(toolbar)
        viewpager.adapter = AppViewPagerAdapter(supportFragmentManager, lifecycle)

        TabLayoutMediator(tabs, viewpager, object : TabLayoutMediator.OnConfigureTabCallback {
            override fun onConfigureTab(tab: TabLayout.Tab, position: Int) {
                // Styling each tab here
                tab.text = "Tab $position"
            }
        }).attach()


    }
}



  输出值


TabLayout with ViewPager2

从文档

ViewPager2


  新的功能



从右到左（RTL）布局支持
垂直方向支撑
notifyDataSetChanged功能齐全



  API变更



FragmentStateAdapter替换FragmentStatePagerAdapter
RecyclerView.Adapter替换PagerAdapter
registerOnPageChangeCallback替换addPageChangeListener


样本代码


  为dependencies添加最新的ViewPager2


implementation 'androidx.viewpager2:viewpager2:1.0.0-alpha01'



  布局


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <androidx.viewpager2.widget.ViewPager2
        android:id="@+id/view_pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>



  活动


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

import java.util.ArrayList;

public class MyActivity extends AppCompatActivity {

    ViewPager2 myViewPager2;
    MyAdapter MyAdapter;
    private ArrayList<String> arrayList = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_my);

        myViewPager2 = findViewById(R.id.view_pager);

        arrayList.add("Item 1");
        arrayList.add("Item 2");
        arrayList.add("Item 3");
        arrayList.add("Item 4");
        arrayList.add("Item 5");

        MyAdapter = new MyAdapter(this, arrayList);


        myViewPager2.setOrientation(ViewPager2.ORIENTATION_VERTICAL);

        myViewPager2.setAdapter(MyAdapter);
    }
}



  我的适配器


import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import java.util.ArrayList;

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {

    private Context context;
    private ArrayList<String> arrayList = new ArrayList<>();

    public MyAdapter(Context context, ArrayList<String> arrayList) {
        this.context = context;
        this.arrayList = arrayList;
    }

    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(context).inflate(R.layout.list_item, parent, false);
        return new MyViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
        holder.tvName.setText(arrayList.get(position));
    }

    @Override
    public int getItemCount() {
        return arrayList.size();
    }

    public class MyViewHolder extends RecyclerView.ViewHolder {
        TextView tvName;

        public MyViewHolder(@NonNull View itemView) {
            super(itemView);
            tvName = itemView.findViewById(R.id.tvName);
        }
    }
}


新的功能


  现在我们需要使用ViewPager2.OnPageChangeCallback()来获取ViewPager2的Swipe事件


样本代码

    myViewPager2.registerOnPageChangeCallback(new ViewPager2.OnPageChangeCallback() {
        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
            super.onPageScrolled(position, positionOffset, positionOffsetPixels);
        }

        @Override
        public void onPageSelected(int position) {
            super.onPageSelected(position);

            Log.e("Selected_Page", String.valueOf(position));
        }

        @Override
        public void onPageScrollStateChanged(int state) {
            super.onPageScrollStateChanged(state);
        }
    });



  我们可以使用myViewPager2.setOrientation()设置方向


样本代码

对于HORIZONTAL Orientation使用

myViewPager2.setOrientation(ViewPager2.ORIENTATION_HORIZONTAL);


对于VERTICAL Orientation使用

myViewPager2.setOrientation(ViewPager2.ORIENTATION_VERTICAL);



  我们可以像在notifyDataSetChanged中一样使用RecyclerView.Adapter


样本代码以添加新项目

    btnAdd.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            arrayList.add("New ITEM ADDED");
            MyAdapter.notifyDataSetChanged();
        }
    });


样本代码以删除新项目

    btnRemove.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            arrayList.remove(3);
            MyAdapter.notifyItemRemoved(3);
        }
    });


更新

如果要将Fragment与ViewPager2一起使用，请尝试此操作


  首先创建一个扩展ViewPagerFragmentAdapter的FragmentStateAdapter类


import java.util.ArrayList;
import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.viewpager2.adapter.FragmentStateAdapter;

public class ViewPagerFragmentAdapter extends FragmentStateAdapter {

    private ArrayList<Fragment> arrayList = new ArrayList<>();

    public ViewPagerFragmentAdapter(@NonNull FragmentManager fragmentManager) {
        super(fragmentManager);
    }

    @NonNull
    @Override
    public Fragment getItem(int position) {
        return arrayList.get(position);
    }

    public void addFragment(Fragment fragment) {
        arrayList.add(fragment);
    }

    @Override
    public int getItemCount() {
        return arrayList.size();
    }
}



  现在在您的活动中使用


import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.viewpager2.widget.ViewPager2;
import neel.com.bottomappbar.R;

public class MainActivity extends AppCompatActivity {

    ViewPager2 myViewPager2;
    ViewPagerFragmentAdapter myAdapter;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        myViewPager2 = findViewById(R.id.view_pager);

        myAdapter = new ViewPagerFragmentAdapter(getSupportFragmentManager());

        // add Fragments in your ViewPagerFragmentAdapter class
        myAdapter.addFragment(new FragmentOne());
        myAdapter.addFragment(new Fragmenttwo());
        myAdapter.addFragment(new FragmentThree());

        // set Orientation in your ViewPager2
        myViewPager2.setOrientation(ViewPager2.ORIENTATION_VERTICAL);

        myViewPager2.setAdapter(myAdapter);

    }

}


有关更多信息，请检查此


ViewPager2
ViewPager2 under the Hood
Hands on With ViewPager2


更新2


  Version 1.0.0-alpha02


新的功能


能够禁用用户输入（setUserInputEnabled，isUserInputEnabled）


API变更


ViewPager2班级决赛


Bug修复


FragmentStateAdapter稳定性修复


样本代码以禁用在viewpager2中滑动

myViewPager2.setUserInputEnabled(false);// SAMPLE CODE to disable swiping in viewpager2


myViewPager2.setUserInputEnabled(true);//SAMPLE CODE to enable swiping in viewpager2


更新3


  Version 1.0.0-alpha03
  
  新的功能



以编程方式滚动ViewPager2的能力：fakeDragBy（offsetPx）。



  API变更



FragmentStateAdapter现在需要一个Lifecycle对象。添加了两个实用程序构造函数以从主机FragmentActivity或主机Fragment获取它


样本代码


  ViewPagerFragmentAdapter


import java.util.ArrayList;
import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.lifecycle.Lifecycle;
import androidx.viewpager2.adapter.FragmentStateAdapter;

public class ViewPagerFragmentAdapter extends FragmentStateAdapter {

    private ArrayList<Fragment> arrayList = new ArrayList<>();


    public ViewPagerFragmentAdapter(@NonNull FragmentManager fragmentManager, @NonNull Lifecycle lifecycle) {
        super(fragmentManager, lifecycle);
    }

    @NonNull
    @Override
    public Fragment getItem(int position) {
        return arrayList.get(position);
    }

    public void addFragment(Fragment fragment) {
        arrayList.add(fragment);
    }

    @Override
    public int getItemCount() {
        return arrayList.size();
    }
}



  MainActivity代码


import android.os.Bundle;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.viewpager2.widget.ViewPager2;
import neel.com.bottomappbar.R;

public class MainActivity extends AppCompatActivity {

    ViewPager2 myViewPager2;
    ViewPagerFragmentAdapter myAdapter;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        myViewPager2=findViewById(R.id.view_pager);
        myAdapter = new ViewPagerFragmentAdapter(getSupportFragmentManager(), getLifecycle());

        // add Fragments in your ViewPagerFragmentAdapter class
        myAdapter.addFragment(new FragmentOne());
        myAdapter.addFragment(new Fragmenttwo());
        myAdapter.addFragment(new FragmentThree());

        myViewPager2.setOrientation(ViewPager2.ORIENTATION_VERTICAL);

        myViewPager2.setAdapter(myAdapter);
    }
}


更新4


  Version 1.0.0-alpha05
  新的功能



ItemDecorator的行为与RecyclerView一致。
引入了MarginPageTransformer以提供在页面之间（页面插图之外）创建空间的功能。
引入CompositePageTransformer以提供组合多个PageTransformers的功能



  API变更



FragmentStateAdapter#getItem方法重命名为FragmentStateAdapter#createFragment-以前的方法名称已被证明是过去漏洞的来源。
OFFSCREEN_PAGE_LIMIT_DEFAULT值从0更改为-1。如果使用OFFSCREEN_PAGE_LIMIT_DEFAULTconstant，则无需更改客户端代码。


样本代码


  活动代码


import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.RecyclerView;
import androidx.viewpager2.widget.MarginPageTransformer;
import androidx.viewpager2.widget.ViewPager2;
import neel.com.bottomappbar.R;

public class MainActivity extends AppCompatActivity {

    ViewPager2 myViewPager2;
    ViewPagerFragmentAdapter myAdapter;
    private ArrayList<Fragment> arrayList = new ArrayList<>();

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        myViewPager2 = findViewById(R.id.myViewPager2);

        // add Fragments in your ViewPagerFragmentAdapter class
        arrayList.add(new FragmentOne());
        arrayList.add(new Fragmenttwo());
        arrayList.add(new FragmentThree());

        myAdapter = new ViewPagerFragmentAdapter(getSupportFragmentManager(), getLifecycle());
        // set Orientation in your ViewPager2
        myViewPager2.setOrientation(ViewPager2.ORIENTATION_HORIZONTAL);

        myViewPager2.setAdapter(myAdapter);

        myViewPager2.setPageTransformer(new MarginPageTransformer(1500));


    }
}



  ViewPagerFragmentAdapter


import java.util.ArrayList;
import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.lifecycle.Lifecycle;
import androidx.viewpager2.adapter.FragmentStateAdapter;

public class ViewPagerFragmentAdapter extends FragmentStateAdapter {

    private ArrayList<Fragment> arrayList = new ArrayList<>();


    public ViewPagerFragmentAdapter(@NonNull FragmentManager fragmentManager, @NonNull Lifecycle lifecycle) {
        super(fragmentManager, lifecycle);
    }

    @NonNull
    @Override
    public Fragment createFragment(int position) {
        switch (position) {
            case 0:
                return new FragmentOne();
            case 1:
                return new Fragmenttwo();
            case 2:
                return new FragmentThree();

        }
        return null;
    }

    @Override
    public int getItemCount() {
        return 3;
    }
}

关于android - 在Android中使用ViewPager2，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/59517464/

10-14 02:36
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