Viewpager 标签片段 &正常片段_Java开发问题-跟版网

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问题描述

我为我糟糕的代码和糟糕的知识提前道歉.我最近才开始使用 Android 和 Java 进行编码

我的问题是我有导航抽屉和标签.虽然如果我从导航抽屉中选择加载到片段中的东西，它不会显示.仅显示选项卡.

我的计划是一个导航抽屉选项卡里面应该有 3 个选项卡，其余的只是没有选项卡的普通页面.

MainActivity.java

Activity.xml:

活动中的代码:

公共类 MainActivity 扩展 AppCompatActivity实现 NavigationView.OnNavigationItemSelectedListener {@覆盖protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);工具栏工具栏 = (Toolbar) findViewById(R.id.toolbar);setSupportActionBar(工具栏);DrawerLayout 抽屉 = (DrawerLayout) findViewById(R.id.drawer_layout);ActionBarDrawerToggle 切换 = 新的 ActionBarDrawerToggle(这个，抽屉，工具栏，R.string.navigation_drawer_open，R.string.navigation_drawer_close)；抽屉.setDrawerListener(toggle);切换.syncState();NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);navigationView.setNavigationItemSelectedListener(this);getSupportFragmentManager().beginTransaction().replace(R.id.fragmentContainer, new FragmentWithTabs()).commit();}@覆盖公共无效 onBackPressed() {DrawerLayout 抽屉 = (DrawerLayout) findViewById(R.id.drawer_layout);if (drawer.isDrawerOpen(GravityCompat.START)) {抽屉.closeDrawer(GravityCompat.START);} 别的 {super.onBackPressed();}}@SuppressWarnings("StatementWithEmptyBody")@覆盖public boolean onNavigationItemSelected(MenuItem item) {//处理导航视图项目点击这里.int id = item.getItemId();如果(id == R.id.fragment_1){getSupportFragmentManager().beginTransaction().replace(R.id.fragmentContainer, new FragmentWithTabs()).commit();} else if (id == R.id.fragment_2) {getSupportFragmentManager().beginTransaction().replace(R.id.fragmentContainer, new FragmentWithoutTabs()).commit();} else if (id == R.id.fragment_3) {getSupportFragmentManager().beginTransaction().replace(R.id.fragmentContainer, new Fragment()).commit();}DrawerLayout 抽屉 = (DrawerLayout) findViewById(R.id.drawer_layout);抽屉.closeDrawer(GravityCompat.START);返回真；}}

也就是说，如您所见，我将 FrameLayout 中的片段替换为 id fragmentContainer.

所有与带有标签的片段相关的逻辑，都封装在FragmentWithTabs中:

公共类 FragmentWithTabs 扩展 Fragment {@Nullable@覆盖public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup 容器, @Nullable Bundle savedInstanceState) {查看 rootView = inflater.inflate(R.layout.fragment_with_tabs, container, false);ViewPager viewPager = (ViewPager)rootView.findViewById(R.id.viewPager);TabLayout tabLayout = (TabLayout)rootView.findViewById(R.id.tabLayout);viewPager.setAdapter(new FragmentPagerAdapter(getChildFragmentManager()) {@覆盖公共片段getItem(int位置){return new SubFragment(position == 0? Color.BLUE : position == 1? Color.WHITE : Color.RED);}@覆盖公共 CharSequence getPageTitle(int position) {返回位置+"";}@覆盖公共 int getCount() {返回 3；}});tabLayout.setupWithViewPager(viewPager);返回根视图；}}

希望对你有帮助

I apologize in beforehand for my bad code and bad knowledge. I have just recently started coding in Android and Java



My problem is that I have Navigation Drawer and Tabs. Although if I choose something from the navigation drawer which loads up in a Fragment it doesn't show. Only the tabs are showing.

My plan is that one navigation drawer tab shall have 3 tabs inside and the rest just normal pages without tabs.

MainActivity.java

http://pastebin.com/TV7aWy9c

activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
    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/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:openDrawer="start">

    <FrameLayout
        android:id="@+id/fragment_layout"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_weight="1"
        android:background="#000000" />

    <include
        layout="@layout/app_bar_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <android.support.design.widget.NavigationView
        android:id="@+id/nav_view"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:fitsSystemWindows="true"
        app:headerLayout="@layout/nav_header_main"
        app:menu="@menu/activity_main_drawer" />

</android.support.v4.widget.DrawerLayout>
app_bar_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.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"
    android:fitsSystemWindows="true"
    tools:context="se.themeister.hello.MainActivity">

    <android.support.design.widget.AppBarLayout
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        android:theme="@style/AppTheme.AppBarOverlay">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/AppTheme.PopupOverlay" />

        <android.support.design.widget.TabLayout
            android:id="@+id/tab_layout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@+id/toolbar"
            android:background="?attr/colorPrimary"
            android:elevation="6dp"
            android:minHeight="?attr/actionBarSize"
            android:theme="@style/AppTheme.AppBarOverlay"/>

        <android.support.v4.view.ViewPager
            android:id="@+id/pager"
            android:layout_width="match_parent"
            android:layout_height="fill_parent"
            android:background="#009900"
            android:layout_below="@id/tab_layout"/>

    </android.support.design.widget.AppBarLayout>

    <include layout="@layout/content_main"/>

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_margin="@dimen/fab_margin"
        android:src="@android:drawable/ic_dialog_email" />

</android.support.design.widget.CoordinatorLayout>
I don't know if that's enough or if more information or code is needed
 解决方案 
The problem with your code is that your ViewPager with TabLayout should be part of the Fragment, not part of the Activity. And NavigationDrawer should just replace one fragment by another in the viewport (i.e. in the container). Now, in your code, you're trying to somehow insert your new Fragment into the ViewPager.

Here's a very basic app with Navigation Drawer, one Fragment with Tabs and rest fragments without tabs, which you can use as an example:



Activity.xml:
<android.support.v4.widget.DrawerLayout 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/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:openDrawer="start">

    <android.support.design.widget.CoordinatorLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fitsSystemWindows="true">

        <android.support.design.widget.AppBarLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:theme="@style/AppTheme.AppBarOverlay">

            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:background="?attr/colorPrimary"
                app:popupTheme="@style/AppTheme.PopupOverlay" />

        </android.support.design.widget.AppBarLayout>

        <FrameLayout
            android:id="@+id/fragmentContainer"
            android:layout_marginTop="?attr/actionBarSize"
            android:layout_width="match_parent"
            android:layout_height="match_parent"/>

    </android.support.design.widget.CoordinatorLayout>

    <android.support.design.widget.NavigationView
        android:id="@+id/nav_view"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:fitsSystemWindows="true"
        app:headerLayout="@layout/nav_header_main"
        app:menu="@menu/activity_main_drawer" />    
</android.support.v4.widget.DrawerLayout>
The code in the activity:
public class MainActivity extends AppCompatActivity
        implements NavigationView.OnNavigationItemSelectedListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
                this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
        drawer.setDrawerListener(toggle);
        toggle.syncState();

        NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
        navigationView.setNavigationItemSelectedListener(this);

        getSupportFragmentManager().beginTransaction().replace(R.id.fragmentContainer, new FragmentWithTabs()).commit();
    }

    @Override
    public void onBackPressed() {
        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        if (drawer.isDrawerOpen(GravityCompat.START)) {
            drawer.closeDrawer(GravityCompat.START);
        } else {
            super.onBackPressed();
        }
    }

    @SuppressWarnings("StatementWithEmptyBody")
    @Override
    public boolean onNavigationItemSelected(MenuItem item) {
        // Handle navigation view item clicks here.
        int id = item.getItemId();

        if (id == R.id.fragment_1) {
            getSupportFragmentManager().beginTransaction().replace(R.id.fragmentContainer, new FragmentWithTabs()).commit();
        } else if (id == R.id.fragment_2) {
            getSupportFragmentManager().beginTransaction().replace(R.id.fragmentContainer, new FragmentWithoutTabs()).commit();
        } else if (id == R.id.fragment_3) {
            getSupportFragmentManager().beginTransaction().replace(R.id.fragmentContainer, new Fragment()).commit();
        }

        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        drawer.closeDrawer(GravityCompat.START);
        return true;
    }
}
I.e., as you see, I'm replacing fragments in the FrameLayout with id fragmentContainer.

All logic related to the fragment with tabs, incapsulated in FragmentWithTabs:
public class FragmentWithTabs extends Fragment {

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_with_tabs, container, false);
        ViewPager viewPager = (ViewPager)rootView.findViewById(R.id.viewPager);
        TabLayout tabLayout = (TabLayout)rootView.findViewById(R.id.tabLayout);

        viewPager.setAdapter(new FragmentPagerAdapter(getChildFragmentManager()) {
            @Override
            public Fragment getItem(int position) {
                return new SubFragment(position == 0? Color.BLUE : position == 1? Color.WHITE : Color.RED);
            }

            @Override
            public CharSequence getPageTitle(int position) {
                return position+"";
            }

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

        tabLayout.setupWithViewPager(viewPager);
        return rootView;
    }
}
I hope, it helps

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