Fatal编程技术网
  • android/
  • 具有不同片段的Android ViewPager2：错误->；始终显示相同的片段

具有不同片段的Android ViewPager2：错误->；始终显示相同的片段

android android-fragments

具有不同片段的Android ViewPager2：错误->；始终显示相同的片段,android,android-fragments,Android,Android Fragments,我正在使用新的android viewpager2，但是当我加载不同的片段时，viewpager2只显示相同的片段 这是一个错误吗？在旧的viewpager中，一切正常 正如图中所示，android应用程序加载了相同的片段。 在viewPagerAdapter中，我为每个位置加载或创建不同的片段 代码视图页面雷达 public class ViewPagerAdapter extends FragmentStateAdapter { public ViewPagerAdapter(

我正在使用新的android viewpager2，但是当我加载不同的片段时，viewpager2只显示相同的片段

这是一个错误吗？在旧的viewpager中，一切正常

正如图中所示，android应用程序加载了相同的片段。

在viewPagerAdapter中，我为每个位置加载或创建不同的片段 代码视图页面雷达

public class ViewPagerAdapter extends FragmentStateAdapter {

    public ViewPagerAdapter(@NonNull FragmentActivity fragmentActivity)
    {
        super(fragmentActivity);
    }

    @NonNull
    @Override
    public Fragment createFragment(int position) {

        switch (position) {
            case 0:
                return  new page1();
            case 1:
                return  new page2();
            default:
                return  new pageDefault();
        }
    }
    @Override
    public int getItemCount() {return 3; }


}

MainActivity.class

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tabLayout = findViewById(R.id.tabs);
        viewPager2 = findViewById(R.id.view_pager);
    
        ViewPagerAdapter adapter = new ViewPagerAdapter(this);
        viewPager2.setAdapter(adapter);
    
        new TabLayoutMediator(tabLayout, viewPager2,
                new TabLayoutMediator.TabConfigurationStrategy() {
                    @Override
                    public void onConfigureTab(@NonNull TabLayout.Tab tab, int position) {
                        tab.setText("Tab " + (position + 1));
                    }
                }).attach();
}
碎片来了 第1页

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/fragment_page1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".page1">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center_vertical"
        android:textSize="20sp"
        android:textStyle="bold"
        android:text="This is Page 0" />

</FrameLayout>
在尝试提供的代码并添加丢失的文件后，我无法复制您的问题，并且在测试中工作正常

ViewPagerAdapter.java
文件

package com.example.adapter;

import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentActivity;
import androidx.viewpager2.adapter.FragmentStateAdapter;
import com.example.fragment.page1;
import com.example.fragment.page2;
import com.example.fragment.pageDefault;

public class ViewPagerAdapter extends FragmentStateAdapter {

    public ViewPagerAdapter(@NonNull FragmentActivity fragmentActivity) {
        super(fragmentActivity);
    }

    @NonNull
    @Override
    public Fragment createFragment(int position) {

        switch (position) {
            case 0:
                return new page1();
            case 1:
                return new page2();
            default:
                return new pageDefault();
        }
    }

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

package com.example.view;

import android.app.Activity;
import android.os.Bundle;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.FragmentActivity;
import androidx.viewpager2.widget.ViewPager2;
import com.example.R;
import com.example.adapter.ViewPagerAdapter;
import com.google.android.material.tabs.TabLayout;
import com.google.android.material.tabs.TabLayoutMediator;

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        TabLayout tabLayout = findViewById(R.id.tabs);
        ViewPager2 viewPager2 = findViewById(R.id.view_pager);

        ViewPagerAdapter adapter = new ViewPagerAdapter(this);
        viewPager2.setAdapter(adapter);

        new TabLayoutMediator(tabLayout, viewPager2,
                new TabLayoutMediator.TabConfigurationStrategy() {
                    @Override
                    public void onConfigureTab(@NonNull TabLayout.Tab tab, int position) {
                        tab.setText("Tab " + (position + 1));
                    }
                }).attach();
    }
}

public class page1 extends Fragment {

    public page1() {
        // Required empty public constructor
    }

    public static page1 newInstance() {
        page1 fragment = new page1();
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        return inflater.inflate(R.layout.fragment_page1, container, false);
    }
}

    public class page2 extends Fragment {
    
        public page2() {
            // Required empty public constructor
        }
    
        public static page2 newInstance() {
            page2 fragment = new page2();
            return fragment;
        }
    
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
        }
    
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            return inflater.inflate(R.layout.fragment_page2, container, false);
        }
    }

public class pageDefault extends Fragment {

    public pageDefault() {
        // Required empty public constructor
    }

    public static pageDefault newInstance() {
        pageDefault fragment = new pageDefault();
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_page_default, container, false);
    }
}

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

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

    <androidx.viewpager2.widget.ViewPager2
        android:id="@+id/view_pager"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/fragment_page1"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center_vertical"
        android:text="This is Page 0"
        android:textSize="20sp"
        android:textStyle="bold" />

</FrameLayout>

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

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:textSize="20sp"
        android:textStyle="bold"
        android:text="This is Page 02"
        android:background="@android:color/holo_red_light"/>

</FrameLayout>

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:textSize="20sp"
        android:textStyle="bold"
        android:text="This is Page Default"/>

</FrameLayout>

MainActivity.java
文件

package com.example.adapter;

import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentActivity;
import androidx.viewpager2.adapter.FragmentStateAdapter;
import com.example.fragment.page1;
import com.example.fragment.page2;
import com.example.fragment.pageDefault;

public class ViewPagerAdapter extends FragmentStateAdapter {

    public ViewPagerAdapter(@NonNull FragmentActivity fragmentActivity) {
        super(fragmentActivity);
    }

    @NonNull
    @Override
    public Fragment createFragment(int position) {

        switch (position) {
            case 0:
                return new page1();
            case 1:
                return new page2();
            default:
                return new pageDefault();
        }
    }

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

package com.example.view;

import android.app.Activity;
import android.os.Bundle;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.FragmentActivity;
import androidx.viewpager2.widget.ViewPager2;
import com.example.R;
import com.example.adapter.ViewPagerAdapter;
import com.google.android.material.tabs.TabLayout;
import com.google.android.material.tabs.TabLayoutMediator;

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        TabLayout tabLayout = findViewById(R.id.tabs);
        ViewPager2 viewPager2 = findViewById(R.id.view_pager);

        ViewPagerAdapter adapter = new ViewPagerAdapter(this);
        viewPager2.setAdapter(adapter);

        new TabLayoutMediator(tabLayout, viewPager2,
                new TabLayoutMediator.TabConfigurationStrategy() {
                    @Override
                    public void onConfigureTab(@NonNull TabLayout.Tab tab, int position) {
                        tab.setText("Tab " + (position + 1));
                    }
                }).attach();
    }
}

public class page1 extends Fragment {

    public page1() {
        // Required empty public constructor
    }

    public static page1 newInstance() {
        page1 fragment = new page1();
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        return inflater.inflate(R.layout.fragment_page1, container, false);
    }
}

    public class page2 extends Fragment {
    
        public page2() {
            // Required empty public constructor
        }
    
        public static page2 newInstance() {
            page2 fragment = new page2();
            return fragment;
        }
    
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
        }
    
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            return inflater.inflate(R.layout.fragment_page2, container, false);
        }
    }

public class pageDefault extends Fragment {

    public pageDefault() {
        // Required empty public constructor
    }

    public static pageDefault newInstance() {
        pageDefault fragment = new pageDefault();
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_page_default, container, false);
    }
}

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

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

    <androidx.viewpager2.widget.ViewPager2
        android:id="@+id/view_pager"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/fragment_page1"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center_vertical"
        android:text="This is Page 0"
        android:textSize="20sp"
        android:textStyle="bold" />

</FrameLayout>

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

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:textSize="20sp"
        android:textStyle="bold"
        android:text="This is Page 02"
        android:background="@android:color/holo_red_light"/>

</FrameLayout>

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:textSize="20sp"
        android:textStyle="bold"
        android:text="This is Page Default"/>

</FrameLayout>

page1.java
文件

package com.example.adapter;

import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentActivity;
import androidx.viewpager2.adapter.FragmentStateAdapter;
import com.example.fragment.page1;
import com.example.fragment.page2;
import com.example.fragment.pageDefault;

public class ViewPagerAdapter extends FragmentStateAdapter {

    public ViewPagerAdapter(@NonNull FragmentActivity fragmentActivity) {
        super(fragmentActivity);
    }

    @NonNull
    @Override
    public Fragment createFragment(int position) {

        switch (position) {
            case 0:
                return new page1();
            case 1:
                return new page2();
            default:
                return new pageDefault();
        }
    }

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

package com.example.view;

import android.app.Activity;
import android.os.Bundle;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.FragmentActivity;
import androidx.viewpager2.widget.ViewPager2;
import com.example.R;
import com.example.adapter.ViewPagerAdapter;
import com.google.android.material.tabs.TabLayout;
import com.google.android.material.tabs.TabLayoutMediator;

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        TabLayout tabLayout = findViewById(R.id.tabs);
        ViewPager2 viewPager2 = findViewById(R.id.view_pager);

        ViewPagerAdapter adapter = new ViewPagerAdapter(this);
        viewPager2.setAdapter(adapter);

        new TabLayoutMediator(tabLayout, viewPager2,
                new TabLayoutMediator.TabConfigurationStrategy() {
                    @Override
                    public void onConfigureTab(@NonNull TabLayout.Tab tab, int position) {
                        tab.setText("Tab " + (position + 1));
                    }
                }).attach();
    }
}

public class page1 extends Fragment {

    public page1() {
        // Required empty public constructor
    }

    public static page1 newInstance() {
        page1 fragment = new page1();
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        return inflater.inflate(R.layout.fragment_page1, container, false);
    }
}

    public class page2 extends Fragment {
    
        public page2() {
            // Required empty public constructor
        }
    
        public static page2 newInstance() {
            page2 fragment = new page2();
            return fragment;
        }
    
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
        }
    
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            return inflater.inflate(R.layout.fragment_page2, container, false);
        }
    }

public class pageDefault extends Fragment {

    public pageDefault() {
        // Required empty public constructor
    }

    public static pageDefault newInstance() {
        pageDefault fragment = new pageDefault();
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_page_default, container, false);
    }
}

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

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

    <androidx.viewpager2.widget.ViewPager2
        android:id="@+id/view_pager"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/fragment_page1"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center_vertical"
        android:text="This is Page 0"
        android:textSize="20sp"
        android:textStyle="bold" />

</FrameLayout>

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

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:textSize="20sp"
        android:textStyle="bold"
        android:text="This is Page 02"
        android:background="@android:color/holo_red_light"/>

</FrameLayout>

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:textSize="20sp"
        android:textStyle="bold"
        android:text="This is Page Default"/>

</FrameLayout>

page2.java
文件

package com.example.adapter;

import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentActivity;
import androidx.viewpager2.adapter.FragmentStateAdapter;
import com.example.fragment.page1;
import com.example.fragment.page2;
import com.example.fragment.pageDefault;

public class ViewPagerAdapter extends FragmentStateAdapter {

    public ViewPagerAdapter(@NonNull FragmentActivity fragmentActivity) {
        super(fragmentActivity);
    }

    @NonNull
    @Override
    public Fragment createFragment(int position) {

        switch (position) {
            case 0:
                return new page1();
            case 1:
                return new page2();
            default:
                return new pageDefault();
        }
    }

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

package com.example.view;

import android.app.Activity;
import android.os.Bundle;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.FragmentActivity;
import androidx.viewpager2.widget.ViewPager2;
import com.example.R;
import com.example.adapter.ViewPagerAdapter;
import com.google.android.material.tabs.TabLayout;
import com.google.android.material.tabs.TabLayoutMediator;

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        TabLayout tabLayout = findViewById(R.id.tabs);
        ViewPager2 viewPager2 = findViewById(R.id.view_pager);

        ViewPagerAdapter adapter = new ViewPagerAdapter(this);
        viewPager2.setAdapter(adapter);

        new TabLayoutMediator(tabLayout, viewPager2,
                new TabLayoutMediator.TabConfigurationStrategy() {
                    @Override
                    public void onConfigureTab(@NonNull TabLayout.Tab tab, int position) {
                        tab.setText("Tab " + (position + 1));
                    }
                }).attach();
    }
}

public class page1 extends Fragment {

    public page1() {
        // Required empty public constructor
    }

    public static page1 newInstance() {
        page1 fragment = new page1();
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        return inflater.inflate(R.layout.fragment_page1, container, false);
    }
}

    public class page2 extends Fragment {
    
        public page2() {
            // Required empty public constructor
        }
    
        public static page2 newInstance() {
            page2 fragment = new page2();
            return fragment;
        }
    
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
        }
    
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            return inflater.inflate(R.layout.fragment_page2, container, false);
        }
    }

public class pageDefault extends Fragment {

    public pageDefault() {
        // Required empty public constructor
    }

    public static pageDefault newInstance() {
        pageDefault fragment = new pageDefault();
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_page_default, container, false);
    }
}

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

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

    <androidx.viewpager2.widget.ViewPager2
        android:id="@+id/view_pager"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/fragment_page1"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center_vertical"
        android:text="This is Page 0"
        android:textSize="20sp"
        android:textStyle="bold" />

</FrameLayout>

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

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:textSize="20sp"
        android:textStyle="bold"
        android:text="This is Page 02"
        android:background="@android:color/holo_red_light"/>

</FrameLayout>

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:textSize="20sp"
        android:textStyle="bold"
        android:text="This is Page Default"/>

</FrameLayout>

pageDefault.java
文件

package com.example.adapter;

import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentActivity;
import androidx.viewpager2.adapter.FragmentStateAdapter;
import com.example.fragment.page1;
import com.example.fragment.page2;
import com.example.fragment.pageDefault;

public class ViewPagerAdapter extends FragmentStateAdapter {

    public ViewPagerAdapter(@NonNull FragmentActivity fragmentActivity) {
        super(fragmentActivity);
    }

    @NonNull
    @Override
    public Fragment createFragment(int position) {

        switch (position) {
            case 0:
                return new page1();
            case 1:
                return new page2();
            default:
                return new pageDefault();
        }
    }

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

package com.example.view;

import android.app.Activity;
import android.os.Bundle;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.FragmentActivity;
import androidx.viewpager2.widget.ViewPager2;
import com.example.R;
import com.example.adapter.ViewPagerAdapter;
import com.google.android.material.tabs.TabLayout;
import com.google.android.material.tabs.TabLayoutMediator;

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        TabLayout tabLayout = findViewById(R.id.tabs);
        ViewPager2 viewPager2 = findViewById(R.id.view_pager);

        ViewPagerAdapter adapter = new ViewPagerAdapter(this);
        viewPager2.setAdapter(adapter);

        new TabLayoutMediator(tabLayout, viewPager2,
                new TabLayoutMediator.TabConfigurationStrategy() {
                    @Override
                    public void onConfigureTab(@NonNull TabLayout.Tab tab, int position) {
                        tab.setText("Tab " + (position + 1));
                    }
                }).attach();
    }
}

public class page1 extends Fragment {

    public page1() {
        // Required empty public constructor
    }

    public static page1 newInstance() {
        page1 fragment = new page1();
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        return inflater.inflate(R.layout.fragment_page1, container, false);
    }
}

    public class page2 extends Fragment {
    
        public page2() {
            // Required empty public constructor
        }
    
        public static page2 newInstance() {
            page2 fragment = new page2();
            return fragment;
        }
    
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
        }
    
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            return inflater.inflate(R.layout.fragment_page2, container, false);
        }
    }

public class pageDefault extends Fragment {

    public pageDefault() {
        // Required empty public constructor
    }

    public static pageDefault newInstance() {
        pageDefault fragment = new pageDefault();
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_page_default, container, false);
    }
}

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

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

    <androidx.viewpager2.widget.ViewPager2
        android:id="@+id/view_pager"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/fragment_page1"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center_vertical"
        android:text="This is Page 0"
        android:textSize="20sp"
        android:textStyle="bold" />

</FrameLayout>

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

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:textSize="20sp"
        android:textStyle="bold"
        android:text="This is Page 02"
        android:background="@android:color/holo_red_light"/>

</FrameLayout>

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:textSize="20sp"
        android:textStyle="bold"
        android:text="This is Page Default"/>

</FrameLayout>

main_activity.xml
文件

package com.example.adapter;

import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentActivity;
import androidx.viewpager2.adapter.FragmentStateAdapter;
import com.example.fragment.page1;
import com.example.fragment.page2;
import com.example.fragment.pageDefault;

public class ViewPagerAdapter extends FragmentStateAdapter {

    public ViewPagerAdapter(@NonNull FragmentActivity fragmentActivity) {
        super(fragmentActivity);
    }

    @NonNull
    @Override
    public Fragment createFragment(int position) {

        switch (position) {
            case 0:
                return new page1();
            case 1:
                return new page2();
            default:
                return new pageDefault();
        }
    }

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

package com.example.view;

import android.app.Activity;
import android.os.Bundle;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.FragmentActivity;
import androidx.viewpager2.widget.ViewPager2;
import com.example.R;
import com.example.adapter.ViewPagerAdapter;
import com.google.android.material.tabs.TabLayout;
import com.google.android.material.tabs.TabLayoutMediator;

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        TabLayout tabLayout = findViewById(R.id.tabs);
        ViewPager2 viewPager2 = findViewById(R.id.view_pager);

        ViewPagerAdapter adapter = new ViewPagerAdapter(this);
        viewPager2.setAdapter(adapter);

        new TabLayoutMediator(tabLayout, viewPager2,
                new TabLayoutMediator.TabConfigurationStrategy() {
                    @Override
                    public void onConfigureTab(@NonNull TabLayout.Tab tab, int position) {
                        tab.setText("Tab " + (position + 1));
                    }
                }).attach();
    }
}

public class page1 extends Fragment {

    public page1() {
        // Required empty public constructor
    }

    public static page1 newInstance() {
        page1 fragment = new page1();
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        return inflater.inflate(R.layout.fragment_page1, container, false);
    }
}

    public class page2 extends Fragment {
    
        public page2() {
            // Required empty public constructor
        }
    
        public static page2 newInstance() {
            page2 fragment = new page2();
            return fragment;
        }
    
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
        }
    
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            return inflater.inflate(R.layout.fragment_page2, container, false);
        }
    }

public class pageDefault extends Fragment {

    public pageDefault() {
        // Required empty public constructor
    }

    public static pageDefault newInstance() {
        pageDefault fragment = new pageDefault();
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_page_default, container, false);
    }
}

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

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

    <androidx.viewpager2.widget.ViewPager2
        android:id="@+id/view_pager"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/fragment_page1"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center_vertical"
        android:text="This is Page 0"
        android:textSize="20sp"
        android:textStyle="bold" />

</FrameLayout>

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

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:textSize="20sp"
        android:textStyle="bold"
        android:text="This is Page 02"
        android:background="@android:color/holo_red_light"/>

</FrameLayout>

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:textSize="20sp"
        android:textStyle="bold"
        android:text="This is Page Default"/>

</FrameLayout>

fragment_page2.xml
文件

package com.example.adapter;

import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentActivity;
import androidx.viewpager2.adapter.FragmentStateAdapter;
import com.example.fragment.page1;
import com.example.fragment.page2;
import com.example.fragment.pageDefault;

public class ViewPagerAdapter extends FragmentStateAdapter {

    public ViewPagerAdapter(@NonNull FragmentActivity fragmentActivity) {
        super(fragmentActivity);
    }

    @NonNull
    @Override
    public Fragment createFragment(int position) {

        switch (position) {
            case 0:
                return new page1();
            case 1:
                return new page2();
            default:
                return new pageDefault();
        }
    }

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

package com.example.view;

import android.app.Activity;
import android.os.Bundle;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.FragmentActivity;
import androidx.viewpager2.widget.ViewPager2;
import com.example.R;
import com.example.adapter.ViewPagerAdapter;
import com.google.android.material.tabs.TabLayout;
import com.google.android.material.tabs.TabLayoutMediator;

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        TabLayout tabLayout = findViewById(R.id.tabs);
        ViewPager2 viewPager2 = findViewById(R.id.view_pager);

        ViewPagerAdapter adapter = new ViewPagerAdapter(this);
        viewPager2.setAdapter(adapter);

        new TabLayoutMediator(tabLayout, viewPager2,
                new TabLayoutMediator.TabConfigurationStrategy() {
                    @Override
                    public void onConfigureTab(@NonNull TabLayout.Tab tab, int position) {
                        tab.setText("Tab " + (position + 1));
                    }
                }).attach();
    }
}

public class page1 extends Fragment {

    public page1() {
        // Required empty public constructor
    }

    public static page1 newInstance() {
        page1 fragment = new page1();
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        return inflater.inflate(R.layout.fragment_page1, container, false);
    }
}

    public class page2 extends Fragment {
    
        public page2() {
            // Required empty public constructor
        }
    
        public static page2 newInstance() {
            page2 fragment = new page2();
            return fragment;
        }
    
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
        }
    
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            return inflater.inflate(R.layout.fragment_page2, container, false);
        }
    }

public class pageDefault extends Fragment {

    public pageDefault() {
        // Required empty public constructor
    }

    public static pageDefault newInstance() {
        pageDefault fragment = new pageDefault();
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_page_default, container, false);
    }
}

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

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

    <androidx.viewpager2.widget.ViewPager2
        android:id="@+id/view_pager"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/fragment_page1"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center_vertical"
        android:text="This is Page 0"
        android:textSize="20sp"
        android:textStyle="bold" />

</FrameLayout>

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

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:textSize="20sp"
        android:textStyle="bold"
        android:text="This is Page 02"
        android:background="@android:color/holo_red_light"/>

</FrameLayout>

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:textSize="20sp"
        android:textStyle="bold"
        android:text="This is Page Default"/>

</FrameLayout>
输出：

谢谢，这很好用。 将第2页放大到第1页时出错

@凌驾 CreateView上的公共视图（布局、充气机、视图组容器、捆绑包保存状态）{ 返回充气机。充气（R.layout.fragment_第1页，容器，错误）；
}

可能您对所有片段使用相同的布局，或者所有布局都具有相同的内容。请粘贴您的XML布局和片段代码。所有片段都不同，下一个是文本：如果您可以添加XML和片段代码，这是第02页。我添加了片段。相同的示例适用于默认的ViewPager此选项是否回答了您的问题？你好，Ric17101，我该如何感谢你？它很好用。我一行一行地浏览了一遍，发现我在第2页的放大过程中出现了一个打字错误。。原因是，在page2.java文件中，onCreate方法中存在R.layout.fragment_page1@Override public View onCreateView（LayoutFlater充气器，ViewGroup容器，Bundle savedInstanceState）{return inflater.inflate（R.layou.fragment_page1，container，false）}非常感谢您觉得可以接受我的回答，否则绿色支票就可以了，；）