如何实现与NavigationDrawer和多个片段重复使用相同的TabLayout AppCompatActivity? [英] How do I implement AppCompatActivity with NavigationDrawer and multiple fragments reusing same TabLayout?

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本文介绍了如何实现与NavigationDrawer和多个片段重复使用相同的TabLayout AppCompatActivity?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我已经成功地使用 TabLayout 与AppCompatActivity与一个CoordinatorLayout看起来接近这个片段:

 < android.support.design.widget.CoordinatorLayout的xmlns:机器人=htt​​p://schemas.android.com/apk/res/android
    的xmlns:程序=htt​​p://schemas.android.com/apk/res-auto
    的xmlns:FAB =htt​​p://schemas.android.com/tool​​s
    机器人:layout_width =match_parent
    机器人:layout_height =match_parent>    < android.support.design.widget.AppBarLayout
        机器人:layout_width =match_parent
        机器人:layout_height =WRAP_CONTENT
        机器人:主题=@风格/ ThemeOverlay.AppCompat.Dark.ActionBar>        < android.support.v7.widget.Toolbar
            机器人:ID =@ + ID /工具栏
            机器人:layout_width =match_parent
            机器人:layout_height =?ATTR / actionBarSize
            机器人:ATTR / colorPrimary背景=
            应用:layout_scrollFlags =啪
            应用:popupTheme =@风格/ ThemeOverlay.AppCompat.Light/>        < android.support.design.widget.TabLayout
            机器人:ID =@ + ID /标签
            机器人:layout_width =match_parent
            机器人:layout_height =WRAP_CONTENT
            应用:tabGravity =补
            应用:tabMode =固定/>    < /android.support.design.widget.AppBarLayout>    <包括布局=@布局/内容/>< /android.support.design.widget.CoordinatorLayout>

现在我实现了一个NavigationDrawer和我奋力实现选项卡中被显示我AppCompatActivity里面的片段中的一个。我希望能够几个孩子之间的片段与TabLayout切换这个片段里面。


  1. 如何从我的片段中的一个访问TabLayout?

  2. 如何正确设置PagerAdapter每个片段?

  3. 在哪里打电话addOnPageChangeListener?

  4. 如何隐藏TabLayout当我的片段中的一个并不需要
    显示标签?


解决方案

1。一级片段之间切换

假设布局 content.xml中为:

 <的FrameLayout的xmlns:机器人=htt​​p://schemas.android.com/apk/res/android
    的xmlns:程序=htt​​p://schemas.android.com/apk/res-auto
    的xmlns:工具=htt​​p://schemas.android.com/tool​​s
    机器人:ID =@ + ID / fragment_container
    机器人:layout_width =match_parent
    机器人:layout_height =match_parent
    应用:layout_behavior =@字符串/ appbar_scrolling_view_behavior
    工具:上下文=。ui.MyActivity
    工具:舒=@布局/ my_activity/>

然后,为了能够在片段之间进行切换,实现这个功能:

 私人无效makeTransition(INT fragmentId){
        FragmentManager fragmentManager = getSupportFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();        开关(fragmentId){
            //片段与标签
            案例FRAGMENT_TABS:
                fragmentTransaction.replace(R.id.fragment_container,新TabsFragment());
                //这说明TabLayout
                findViewById(R.id.tabs).setVisibility(View.VISIBLE);
                。getSupportActionBar()的setTitle(R.string.fragment_tabs_title);
                打破;
            //片段没有标签
            案例FRAGMENT_NO_TABS:
                fragmentTransaction.replace(R.id.fragment_container,新NoTabsFragment());
                //这个隐藏TabLayout
                findViewById(R.id.tabs).setVisibility(View.GONE);
                。getSupportActionBar()的setTitle(R.string.fragment_no_tabs_title);
                打破;
            默认:
                抛出新的RuntimeException(+ fragmentId +发现,ID为无分段);
        }
        fragmentTransaction.commit();
    }

2。访问和从一级片段设置TabLayout

TabsFragment 类,添加一个私有类 TabAdapter

 私有类TabAdapter扩展FragmentPagerAdapter {    公共TabAdapter(FragmentManager FM){
        超(FM);
    }    @覆盖
    公共CharSequence的getPageTitle(INT位置){
        开关(位置){
            情况下0:
                返回TAB1
            情况1:
                返回TAB2
            // ...
        }
        返回null;
    }    @覆盖
    公共片段的getItem(INT位置){
        开关(位置){
            情况下0:
                返回Tab1Fragment.getInstance();
            情况1:
                返回Tab2Fragment.getInstance();
            // ...
        }
        返回null;
    }    @覆盖
    公众诠释的getCount(){
        返回2;
    }
}

另外,可选实施 ViewPager.OnPageChangeListener

 私有类FragmentPageChangeListener实现ViewPager.OnPageChangeListener {    @覆盖
    公共无效onPageScrolled(INT位置,浮positionOffset,诠释positionOffsetPixels){
        Log.d(的getClass()的getName(),onPageScrolled);
    }    @覆盖
    公共无效使用onPageSelected(INT位置){
        Log.d(的getClass()的getName(),使用onPageSelected);
    }    @覆盖
    公共无效onPageScrollStateChanged(INT状态){
        Log.d(的getClass()的getName(),onPageScrollStateChanged);
    }
}

假设你的布局与标签片段是这样的:

 <的RelativeLayout的xmlns:机器人=htt​​p://schemas.android.com/apk/res/android
    机器人:layout_width =match_parent
    机器人:layout_height =match_parent
    机器人:方向=垂直>    < android.support.v4.view.ViewPager
        机器人:ID =@ + ID / viewpager
        机器人:layout_width =match_parent
        机器人:layout_height =match_parent
        机器人:layout_alignParentTop =真/>< / RelativeLayout的>

覆盖 onCreateView 来是这样的:

  @Nullable
@覆盖
公共查看onCreateView(LayoutInflater充气器,容器的ViewGroup,捆绑savedInstanceState){
    查看查看= inflater.inflate(R.layout.viewpager_fragment,NULL);    fragmentPagerAdapter =新TabAdapter(getChildFragmentManager());
    fragmentPageChangeListener =新FragmentPageChangeListener();    ViewPager寻呼机=(ViewPager)view.findViewById(R.id.viewpager);
    pager.setAdapter(fragmentPagerAdapter);
    pager.addOnPageChangeListener(fragmentPageChangeListener);    TabLayout tabLayout =(TabLayout)MyAcvtivity.getInstance()findViewById(R.id.tabs)。
    tabLayout.setupWithViewPager(寻呼机);    返回视图。
}

注意:

使用 getChildFragmentManager(),而不是 getFragmentManager()实例化一个ViewPager时在一级片段。

I have successfully used TabLayout with AppCompatActivity with a CoordinatorLayout that looks close to this snippet:

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:fab="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:layout_scrollFlags="snap"
            app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />

        <android.support.design.widget.TabLayout
            android:id="@+id/tabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:tabGravity="fill"
            app:tabMode="fixed" />

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

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

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

Now I have implemented a NavigationDrawer and I am struggling to implement tabs within one of the Fragments being shown inside my AppCompatActivity. I want to be able to switch with TabLayout between few child Fragments inside of this Fragment.

  1. How do I access TabLayout from one of my Fragments?
  2. How do I set PagerAdapter for each of the Fragments correctly?
  3. Where do I call addOnPageChangeListener?
  4. How do I hide TabLayout when one of my Fragments does not need to display tabs?

解决方案

1. Switching between first-level Fragments

Suppose layout content.xml stands for:

<FrameLayout 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/fragment_container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context=".ui.MyActivity"
    tools:showIn="@layout/my_activity" />

Then, to be able to switch between the Fragments, implement this function:

private void makeTransition(int fragmentId) {
        FragmentManager fragmentManager = getSupportFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();

        switch (fragmentId) {
            // Fragment with tabs
            case FRAGMENT_TABS:
                fragmentTransaction.replace(R.id.fragment_container, new TabsFragment());
                // This shows TabLayout
                findViewById(R.id.tabs).setVisibility(View.VISIBLE);
                getSupportActionBar().setTitle(R.string.fragment_tabs_title);
                break;
            // Fragment with no tabs
            case FRAGMENT_NO_TABS:
                fragmentTransaction.replace(R.id.fragment_container, new NoTabsFragment());
                // This hides TabLayout
                findViewById(R.id.tabs).setVisibility(View.GONE);
                getSupportActionBar().setTitle(R.string.fragment_no_tabs_title);
                break;
            default:
                throw new RuntimeException("No fragment with ID " + fragmentId + " found");
        }
        fragmentTransaction.commit();
    }

2. Accessing and setting up TabLayout from first-level Fragment

In TabsFragment class, add a private class TabAdapter:

private class TabAdapter extends FragmentPagerAdapter {

    public TabAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public CharSequence getPageTitle(int position) {
        switch (position) {
            case 0:
                return "TAB1";
            case 1:
                return "TAB2";
            // ...
        }
        return null;
    }

    @Override
    public Fragment getItem(int position) {
        switch (position) {
            case 0:
                return Tab1Fragment.getInstance();
            case 1:
                return Tab2Fragment.getInstance();
            // ...
        }
        return null;
    }

    @Override
    public int getCount() {
        return 2;
    }
}

Also, optionally, implement a ViewPager.OnPageChangeListener:

private class FragmentPageChangeListener implements ViewPager.OnPageChangeListener {

    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
        Log.d(getClass().getName(), "onPageScrolled");
    }

    @Override
    public void onPageSelected(int position) {
        Log.d(getClass().getName(), "onPageSelected");
    }

    @Override
    public void onPageScrollStateChanged(int state) {
        Log.d(getClass().getName(), "onPageScrollStateChanged");
    }
}

Suppose your layout for fragment with tabs is like this:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentTop="true" />

</RelativeLayout>

Override onCreateView to look like this:

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.viewpager_fragment, null);

    fragmentPagerAdapter = new TabAdapter(getChildFragmentManager());
    fragmentPageChangeListener = new FragmentPageChangeListener();

    ViewPager pager = (ViewPager) view.findViewById(R.id.viewpager);
    pager.setAdapter(fragmentPagerAdapter);
    pager.addOnPageChangeListener(fragmentPageChangeListener);

    TabLayout tabLayout = (TabLayout) MyAcvtivity.getInstance().findViewById(R.id.tabs);
    tabLayout.setupWithViewPager(pager);

    return view;
}

NB:

Use getChildFragmentManager() and not getFragmentManager() in first-level Fragments when instantiating a ViewPager.

这篇关于如何实现与NavigationDrawer和多个片段重复使用相同的TabLayout AppCompatActivity?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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