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ViewPage2是基于RecyclerView实现的,继承了RecyclerView的众多优点,用于实现多个页面(fragment)的滑动切换。用于构建用户界面中的多个页面,例如电商平台首页的多个页面横向滑动切换。ViewPager2
可以实现左右/上下滑动手势滑动切换不同的页面。
TabLayout是
用于创建标签式导航栏的UI组件。与ViewPager2联合使用
,ViewPager2滑动
不同页面,Tablayoutn联动对应标题或图标,同时可以实现切换页面的导航功能。TabLayout
通常以标签的形式展示页面,用户能够随意切换到所需的页面。
ViewPager2+
TabLayout
能够为用户提供更好体验和导航方式。ViewPager2可以让
用户通过滑动来浏览不同的页面,TabLayout
提供清晰的标签导航,用户能够快速找到并切换到所需的页面。这种结合使用的模式在许多应用中被广泛采用。
TabLayout 重点注意属性有:
app:tabIndicatorColor = 指示器颜色属性(Indicator)即 下滑线
app:tabSelectedTextColor = tab项选中时的颜色(Selected)
app:tabMode = tab模式("scrollable"左右滑动,fixed固定)
app:tabGravity有两种属性:center和fill;center指的是居中显示,fill指的是沾满全屏。
app:tabRippleColor = 水波纹效果颜色
app:tabIconTint = 图标颜色
在xml布局中为TabLayout添加项:
- <androidx.viewpager2.widget.ViewPager2
- android:id="@+id/view_page2"
- android:layout_width="match_parent"
- android:layout_height="720dp"
- app:layout_constraintTop_toBottomOf="@+id/tab_layout"
- tools:layout_editor_absoluteX="1dp"
- tools:layout_editor_absoluteY="1dp" />
- <com.google.android.material.tabs.TabLayout
- android:id="@+id/tab_layout"
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- app:tabIndicatorColor="#03A9F4"
- app:tabIndicatorHeight="10dp"
- app:tabMode="scrollable"
- app:tabIconTint="#00BCD4"
- app:tabRippleColor="#FFEB3B"
- android:layout_marginTop="29dp"
- app:layout_constraintTop_toTopOf="parent"
- app:layout_constraintStart_toStartOf="parent">
- </com.google.android.material.tabs.TabLayout>
- <?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:id="@+id/main"
- android:layout_width="match_parent"
- android:layout_height="match_parent"
- tools:context=".MainActivity">
-
- <androidx.viewpager2.widget.ViewPager2
- android:id="@+id/view_page2"
- android:layout_width="match_parent"
- android:layout_height="720dp"
- app:layout_constraintTop_toBottomOf="@+id/tab_layout"
- tools:layout_editor_absoluteX="1dp"
- tools:layout_editor_absoluteY="1dp" />
-
- <com.google.android.material.tabs.TabLayout
- android:id="@+id/tab_layout"
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- app:tabIndicatorColor="#03A9F4"
- app:tabIndicatorHeight="10dp"
- app:tabMode="scrollable"
- app:tabIconTint="#00BCD4"
- app:tabRippleColor="#FFEB3B"
- android:layout_marginTop="29dp"
- app:layout_constraintTop_toTopOf="parent"
- app:layout_constraintStart_toStartOf="parent">
- </com.google.android.material.tabs.TabLayout>
- </androidx.constraintlayout.widget.ConstraintLayout>
- public class ModeFragment extends Fragment {
- }
- public class FirstFragment extends ModeFragment{
- @Nullable
- @Override
- public View onCreateView(@NonNull LayoutInflater inflater,
- @Nullable ViewGroup container,
- @Nullable Bundle savedInstanceState) {
- return inflater.inflate(R.layout.first_activity,container,false);
- }
- }
- public class PageFragmentAdapter extends FragmentStateAdapter{
- List<ModeFragment> fragmentList;
- public PageFragmentAdapter(@NonNull FragmentManager fragmentManager,
- @NonNull Lifecycle lifecycle,
- List<ModeFragment> fragmentList) {
- super(fragmentManager, lifecycle);
- this.fragmentList = fragmentList;
- }
- @NonNull
- @Override
- public Fragment createFragment(int position) {
- Fragment fragment = fragmentList.get(position);
- return fragment;
- }
- @Override
- public int getItemCount() {
- return fragmentList.size();
- }
- }
- public class MainActivity extends AppCompatActivity {
- List<ModeFragment> fragmentList = new ArrayList<>();
- List<String> TabName = new ArrayList<>();
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- EdgeToEdge.enable(this);
- setContentView(R.layout.activity_main);
- inPage();
- ViewPager2 viewPager2 = findViewById(R.id.view_page2);
- TabLayout tabLayout = findViewById(R.id.tab_layout);
- PageFragmentAdapter adapter = new PageFragmentAdapter(getSupportFragmentManager(),getLifecycle(),fragmentList);
- viewPager2.setAdapter(adapter);
- TabLayoutMediator mediator = new TabLayoutMediator(tabLayout, viewPager2,
- new TabLayoutMediator.TabConfigurationStrategy() {
- @Override
- public void onConfigureTab(@NonNull TabLayout.Tab tab, int i) {
- tab.setText(TabName.get(i));
-
- }
- });
- mediator.attach();
- }
- private void inPage() {
- ModeFragment f1 = new FirstFragment();
- ModeFragment f2 = new SecondFragment();
- ModeFragment f3 = new ThreeFragment();
- ModeFragment f4 = new FourFragment();
- ModeFragment f5 = new FiveFragment();
- ModeFragment f6 = new SixFragment();
- fragmentList.add(f1);
- fragmentList.add(f2);
- fragmentList.add(f3);
- fragmentList.add(f4);
- fragmentList.add(f5);
- fragmentList.add(f6);
- TabName.add("推荐");
- TabName.add("景色");
- TabName.add("美景");
- TabName.add("风景");
- TabName.add("好景");
- TabName.add("前景");
- }
- }
- public class MainActivity extends AppCompatActivity {
- List<ModeFragment> fragmentList = new ArrayList<>();
- List<String> TabName = new ArrayList<>();
- List<Integer> Icon = new ArrayList<>();
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- EdgeToEdge.enable(this);
- setContentView(R.layout.activity_main);
- inPage();
- ViewPager2 viewPager2 = findViewById(R.id.view_page2);
- TabLayout tabLayout = findViewById(R.id.tab_layout);
- PageFragmentAdapter adapter = new PageFragmentAdapter(getSupportFragmentManager(),getLifecycle(),fragmentList);
- viewPager2.setAdapter(adapter);
- TabLayoutMediator mediator = new TabLayoutMediator(tabLayout, viewPager2,
- new TabLayoutMediator.TabConfigurationStrategy() {
- @Override
- public void onConfigureTab(@NonNull TabLayout.Tab tab, int i) {
- tab.setText(TabName.get(i));
- tab.setIcon(Icon.get(i));
- }
- });
- mediator.attach();
- }
- private void inPage() {
- ModeFragment f1 = new FirstFragment();
- ModeFragment f2 = new SecondFragment();
-
- fragmentList.add(f1);
- fragmentList.add(f2);
-
- TabName.add("推荐");
- TabName.add("景色");
-
- Icon.add(R.drawable.s1_24dp);
- Icon.add(R.drawable.s2_24);
- }
- }
注:文章内容属本人所写理解而表达,非官方说法,仅当本人笔记。
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