片段内容在添加以查看活动的寻呼机时不可见?

Question

我已将 viewpager 放入活动中，视图寻呼机包含 3 个片段，但在正在运行的应用程序中，它不显示片段相关数据。以下是aatached代码，请帮忙。

它不会引发任何错误，但片段内容不可见，尽管选项卡标题可见。我看到某些链接，他们要求您添加getChildFragmentManager()但搜索后我知道它在活动中不受支持。

主活动.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);
}
}

查看寻呼适配器.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>

请帮忙，因为我如何在目前显示为空的查看页面选项卡上查看片段的内容。

Answer 1

一个DrawerLayout应该有 2 个子项，主要内容和导航视图。

在您的情况下，您有 3 个孩子：

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

因此，请尝试将AppBarLayout和ViewPager包裹在LinearLayout中，以便最终DrawerLayout按预期只生 2 个孩子。

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