将片段内容添加到 activity 的查看寻呼机时不可见？

Question

我已将 viewpager 放在 activity 中，view pager 包含 3 个片段，但在运行应用程序上它没有显示相关的片段 data.Following 是附加代码，请帮忙.

它没有抛出任何错误，但片段内容不可见，尽管 tab-titles 是可见的。我看到某些链接，他们要求您添加 getChildFragmentManager()，但在搜索后我知道它在 activity.

中不受支持

MainActivity.java

package kbg.com.kbgpos;

import android.support.annotation.Nullable;
import android.support.design.widget.TabLayout;
import android.support.v4.view.ViewPager;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;


public class MainActivity extends AppCompatActivity {
Toolbar toolbar;
DrawerLayout drawerLayout;
ActionBarDrawerToggle actionBarDrawerToggle;
TabLayout tabLayout;
ViewPager viewPager;
ViewPagerAdapter viewPagerAdapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        toolbar=(Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        drawerLayout=(DrawerLayout) findViewById(R.id.drawer_layout);
        actionBarDrawerToggle=new ActionBarDrawerToggle(this,drawerLayout,toolbar,R.string.drawer_open,R.string.drawer_close);
        actionBarDrawerToggle.getDrawerArrowDrawable().setColor(getResources().getColor(R.color.hamburgerColor));
        drawerLayout.setDrawerListener(actionBarDrawerToggle);
        tabLayout=(TabLayout) findViewById(R.id.tabLayout);
        viewPager=(ViewPager) findViewById(R.id.viewPager);
        viewPagerAdapter=new ViewPagerAdapter(getSupportFragmentManager());
        viewPagerAdapter.addFragments(new Personal_Info_Fragment(),"Personal Info");
        viewPagerAdapter.addFragments(new EducationalExperience_Info_Fragment(),"Edu & Exp Info");
        viewPagerAdapter.addFragments(new OtherInfo_Fragment(),"Official Info");
        viewPager.setAdapter(viewPagerAdapter);
        tabLayout.setupWithViewPager(viewPager);
    }

    @Override
    protected void onPostCreate(@Nullable Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);
        actionBarDrawerToggle.syncState();
    }
}

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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:id="@+id/drawer_layout">

<android.support.design.widget.AppBarLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <include
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        layout="@layout/toolbar_layout"
        android:id="@+id/toolbar"></include>

    <android.support.design.widget.TabLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/tabLayout"
        app:tabMode="fixed"
        app:tabGravity="fill"
        android:background="#b3d9ff"
        app:tabTextAppearance="@style/TabLayoutStyle">

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

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

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

 </android.support.v4.view.ViewPager>

    <android.support.design.widget.NavigationView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/navigation_view"
        android:layout_gravity="start"
        app:headerLayout="@layout/navigation_drawer_header"
        app:itemIconTint="#006699"
        app:menu="@menu/drawer_menu">

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

</android.support.v4.widget.DrawerLayout>

Personal_Info_Fragment

package kbg.com.kbgpos;


import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class Personal_Info_Fragment extends Fragment {


    public Personal_Info_Fragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_personal__info_, container, false);
    }

}

ViewPagerAdapter.java

package kbg.com.kbgpos;

import android.content.Context;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;

import java.util.ArrayList;

public class ViewPagerAdapter extends FragmentPagerAdapter {
    ArrayList<Fragment> fragments=new ArrayList<>();
    ArrayList<String> tabTitles=new ArrayList<>();

    public void addFragments(Fragment fragments,String titles){
        this.fragments.add(fragments);
        this.tabTitles.add(titles);
    }

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

    @Override
    public Fragment getItem(int position) {
        return fragments.get(position);
    }

    @Override
    public int getCount() {
        return fragments.size();
    }

    @Nullable
    @Override
    public CharSequence getPageTitle(int position) {
        return tabTitles.get(position);
    }
}

fragment_personal__info_.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    tools:context=".Personal_Info_Fragment">


   <android.support.v7.widget.CardView
       android:id="@+id/info_cardView"
       android:layout_width="match_parent"
       android:layout_height="80dp"
       android:layout_margin="5dp"
       card_view:cardElevation="2dp"
       card_view:contentPadding="5dp"
       card_view:cardCornerRadius="2dp"
       card_view:cardBackgroundColor="#e5c68b">

       <RelativeLayout
           android:layout_width="wrap_content"
           android:layout_height="wrap_content">
           <ImageView
               android:id="@+id/infoIcon"
               android:layout_width="wrap_content"
               android:layout_height="wrap_content"
               android:src="@drawable/ic_info_black_24dp"
               android:layout_centerVertical="true"
               android:layout_marginRight="2dp"/>
           <TextView
               android:layout_toRightOf="@id/infoIcon"
               android:layout_marginLeft="4dp"
               android:layout_width="match_parent"
               android:layout_height="wrap_content"
               android:text="Please Enter Complete and Valid Information Within the Forms As This Will Be Treated As Final Info"
               android:textColor="@android:color/white"
               android:textSize="14sp"
               android:textAllCaps="true"
               android:textStyle="bold"/>

       </RelativeLayout>

   </android.support.v7.widget.CardView>

</FrameLayout>

请帮助我如何在 viewpager 选项卡上查看目前显示为空的片段内容。

Answer 1

一个DrawerLayout应该有2个children，主要内容和导航视图。

在你的情况下你有 3 children:

<DrawerLayout ...>
    <AppBarLayout /> 
    <ViewPager />
    <NavigationView />
</DrawerLayout>

所以尝试将 AppBarLayout 和 ViewPager 包装到 LinearLayout 中，这样最终 DrawerLayout 就只有预期的 2 children .

<DrawerLayout ...>
    <LinearLayout orientation="vertical">
         <AppBarLayout /> 
         <ViewPager />
    </LinearLayout>
    <NavigationView />
</DrawerLayout>

将片段内容添加到 activity 的查看寻呼机时不可见？

Fragment content not visible on adding it to view pager of an activity?

android

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android-viewpager

android-studio-3.1.4