做网站要钱吗?,北京工作室网站建设,wordpress插件 开发,网站开发php1. 组成架构 整个架构被包在一个外部Fragment之中#xff0c;也可以放在一个Activity之中#xff0c;随意。外部的fragment包含了两个组件#xff0c;即途中的ViewPager和TabLayoutViewPager要套上一个FragmentStatePagerAdapter #xff0c;适配器负责new出一个个fragment…1. 组成架构 整个架构被包在一个外部Fragment之中也可以放在一个Activity之中随意。外部的fragment包含了两个组件即途中的ViewPager和TabLayoutViewPager要套上一个FragmentStatePagerAdapter 适配器负责new出一个个fragment这些fragment object就是负责装数据的一个个页面。ViewPager可以和TabLayout进行关联
2. 实现步骤
2.1 创建内部的fragment object和外部的Fragment public class ObjectFragment extends Fragment {private static String OBJ_INDEX objectIndex;private String mIndex;public ObjectFragment() {}public static ObjectFragment newInstance(String param1) {ObjectFragment fragment new ObjectFragment();Bundle args new Bundle();args.putString(OBJ_INDEX, param1);fragment.setArguments(args);return fragment;}Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);if (getArguments() ! null) {mIndex getArguments().getString(OBJ_INDEX);}}Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {return inflater.inflate(R.layout.fragment_object, container, false);}Overridepublic void onViewCreated(NonNull View view, Nullable Bundle savedInstanceState) {((TextView) view.findViewById(R.id.tv_frg_obj)).setText(item mIndex);}}public class OuterFragment extends Fragment {public OuterFragment() {// Required empty public constructor}public static OuterFragment newInstance() {OuterFragment fragment new OuterFragment();return fragment;}Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);}Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {// Inflate the layout for this fragmentreturn inflater.inflate(R.layout.fragment_outer, container, false);}
}下面是OuterFragment的页面由架构图可以看出外部的fragment包含了ViewPager和TabLayout但是在具体的页面中TabLayout被放进了ViewPager中 androidx.viewpager.widget.ViewPagerandroid:idid/pagerandroid:layout_widthmatch_parentandroid:layout_heightmatch_parentcom.google.android.material.tabs.TabLayoutandroid:idid/tab_layoutandroid:layout_widthmatch_parentandroid:layout_heightwrap_content //androidx.viewpager.widget.ViewPager2.2 创建FragmentStatePagerAdapter适配器
这个东西就是ViewPager的适配器
public class MyFragmentStatePagerAdapter extends FragmentStatePagerAdapter {public MyFragmentStatePagerAdapter(NonNull FragmentManager fm) {super(fm);}NonNullOverridepublic Fragment getItem(int position) {Fragment fragment ObjectFragment.newInstance(position 1 );return fragment;}Overridepublic int getCount() {return 10;}Overridepublic CharSequence getPageTitle(int position) {return (position 1);}}2.3 给ViewPager设置适配器
这里的步骤都在OuterFragment中操作
添加以下成员
MyFragmentStatePagerAdapter fragmentStatePagerAdapter;
ViewPager viewPager;在以下函数中进行设置 Overridepublic void onViewCreated(NonNull View view, Nullable Bundle savedInstanceState) {//设置ViewPager的适配器viewPager view.findViewById(R.id.pager);fragmentStatePagerAdapter new MyFragmentStatePagerAdapter(getChildFragmentManager());viewPager.setAdapter(fragmentStatePagerAdapter);//设置TabLayout与viewPager关联TabLayout tabLayout view.findViewById(R.id.tab_layout);tabLayout.setupWithViewPager(viewPager);}3. 启动
在MainActivity中添加外部的OuterFragment
3.1 布局文件中添加FrameLayout
FrameLayoutandroid:layout_widthmatch_parentandroid:layout_heightmatch_parentandroid:idid/fr_containerandroid:orientationhorizontal
/FrameLayout3.2 启动Fragment
public class MainActivity extends AppCompatActivity {Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);OuterFragment outerFragment new OuterFragment();FragmentManager manager getSupportFragmentManager();FragmentTransaction transaction manager.beginTransaction();transaction.add(R.id.fr_container, outerFragment,1);transaction.addToBackStack(null);transaction.commit();}
}
