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Viewpager 標簽片段 &正常片段

Java問題 html5模板網
Viewpager Tabs Fragment amp; Normal Fragments(Viewpager 標簽片段 amp;正常片段)
本文介紹了Viewpager 標簽片段 &正常片段的處理方法，對大家解決問題具有一定的參考價值，需要的朋友們下面隨著小編來一起學習吧！

問題描述

我為我糟糕的代碼和糟糕的知識提前道歉.我最近才開始使用 Android 和 Java 進行編碼

我的問題是我有導航抽屜和標簽.雖然如果我從導航抽屜中選擇加載到片段中的東西，它不會顯示.僅顯示選項卡.

我的計劃是一個導航抽屜選項卡里面應該有 3 個選項卡，其余的只是沒有選項卡的普通頁面.

MainActivity.java

Activity.xml:

活動中的代碼:

公共類 MainActivity 擴展 AppCompatActivity實現 NavigationView.OnNavigationItemSelectedListener {@覆蓋protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);工具欄工具欄 = (Toolbar) findViewById(R.id.toolbar);setSupportActionBar(工具欄);DrawerLayout 抽屜 = (DrawerLayout) findViewById(R.id.drawer_layout);ActionBarDrawerToggle 切換 = 新的 ActionBarDrawerToggle(這個，抽屜，工具欄，R.string.navigation_drawer_open，R.string.navigation_drawer_close)；抽屜.setDrawerListener(toggle);切換.syncState();NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);navigationView.setNavigationItemSelectedListener(this);getSupportFragmentManager().beginTransaction().replace(R.id.fragmentContainer, new FragmentWithTabs()).commit();}@覆蓋公共無效 onBackPressed() {DrawerLayout 抽屜 = (DrawerLayout) findViewById(R.id.drawer_layout);if (drawer.isDrawerOpen(GravityCompat.START)) {抽屜.closeDrawer(GravityCompat.START);} 別的 {super.onBackPressed();}}@SuppressWarnings("StatementWithEmptyBody")@覆蓋public boolean onNavigationItemSelected(MenuItem item) {//處理導航視圖項目點擊這里.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 抽屜 = (DrawerLayout) findViewById(R.id.drawer_layout);抽屜.closeDrawer(GravityCompat.START);返回真；}}

也就是說，如您所見，我將 FrameLayout 中的片段替換為 id fragmentContainer.

所有與帶有標簽的片段相關的邏輯，都封裝在FragmentWithTabs中:

公共類 FragmentWithTabs 擴展 Fragment {@Nullable@覆蓋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()) {@覆蓋公共片段getItem(int位置){return new SubFragment(position == 0? Color.BLUE : position == 1? Color.WHITE : Color.RED);}@覆蓋公共 CharSequence getPageTitle(int position) {返回位置+"";}@覆蓋公共 int getCount() {返回 3；}});tabLayout.setupWithViewPager(viewPager);返回根視圖；}}

希望對你有幫助

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

解決方案

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

這篇關于Viewpager 標簽片段 &amp;正常片段的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！

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