TabLayout上的标签标题未显示

问题描述 投票:0回答:2

我正在创建带有标签菜单的应用,但是标签标题显示不正确。我尝试重新阅读并再次阅读到目前为止所看过的每篇教程,并将我的代码与其他在stackoverflow上有类似问题的代码进行比较,但我仍然无法确定我在做什么错以及在哪里做错。有人能启发我的错误吗?

谢谢您的澄清。

编辑:我不认为这是颜色。我已经尝试将TabLayout,AppBarLayout和每个选项卡项的颜色和主题分别弄乱(以及完全删除主题),并且标题仍然没有按应有的方式显示。但是我会为我的colors.xml和styles.xml文件发布代码,以防万一。

MainActivity:

package com.example.pousadaviladascores.Activities;

import androidx.appcompat.app.AppCompatActivity;
import androidx.viewpager.widget.ViewPager;
import android.os.Bundle;
import com.example.pousadaviladascores.DAO.SqlAccess;
import com.example.pousadaviladascores.UI.SectionsPagerAdapter;
import com.example.pousadaviladascores.R;
import com.google.android.material.tabs.TabLayout;

public class MainActivity extends AppCompatActivity {

    SqlAccess sqlAccess;

    //Declaring TabLayout and ViewPager
    TabLayout tabLayout;
    ViewPager viewPager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getSupportActionBar().hide();
        setContentView(R.layout.activity_main);

        sqlAccess = new SqlAccess(this);

        //Initializing TabLayout
        tabLayout = findViewById(R.id.tabLayout);

        //Initializing viewPager
        viewPager = findViewById(R.id.view_pager);

        //Initializing page adapter
        //OBS: In Android, Adapter is a bridge between UI component and data source that helps us to fill data in UI component.
        SectionsPagerAdapter sectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager(), tabLayout.getTabCount());

        //Sets a PagerAdapter that will supply views for this pager as needed
        viewPager.setAdapter(sectionsPagerAdapter);

        tabLayout.setupWithViewPager(viewPager);

    }

    @Override
    protected void onDestroy() {
        sqlAccess.getDbHelper().close();
        super.onDestroy();
    }
}

片段类(我有三个类,每个片段一个,它们都有相同的代码,所以我只发布一个):

package com.example.pousadaviladascores.Activities;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import androidx.fragment.app.Fragment;

import com.example.pousadaviladascores.R;

public class Tab1Pagina_Inicial extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        return inflater.inflate(R.layout.tab1_fragment_pagina_inicial, container, false);
    }
}

页面适配器类:

package com.example.pousadaviladascores.UI;

import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentPagerAdapter;

import com.example.pousadaviladascores.Activities.Tab1Pagina_Inicial;
import com.example.pousadaviladascores.Activities.Tab2Apartamentos;
import com.example.pousadaviladascores.Activities.Tab3ItensDeApartamentos;

/**
 * A [FragmentPagerAdapter] that returns a fragment corresponding to
 * one of the sections/tabs/pages.
 */
public class SectionsPagerAdapter extends FragmentPagerAdapter {

    private static int tab_count;

    public SectionsPagerAdapter(FragmentManager fm, int tab_count) {
        super(fm);
        //mContext = context;
        this.tab_count = tab_count;
    }

    @Override
    public Fragment getItem(int position) {
        switch (position)
        {
            case 0:
                Tab1Pagina_Inicial tab1 = new Tab1Pagina_Inicial();
                return tab1;

            case 1:
                Tab2Apartamentos tab2 = new Tab2Apartamentos();
                return tab2;

            case 2:
                Tab3ItensDeApartamentos tab3 = new Tab3ItensDeApartamentos();
                return tab3;

             default:
                 return null;
        }
    }

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

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"

    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.google.android.material.appbar.AppBarLayout
        android:id="@+id/appBarLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay">

        <TextView
            android:id="@+id/textViewAppName"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:paddingLeft="20dp"
            android:paddingTop="5dp"
            android:paddingRight="20dp"
            android:text="@string/pousada_name"
            android:textSize="24sp" />

        <androidx.appcompat.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="34dp"
            android:theme="?attr/actionBarTheme"
            app:layout_scrollFlags="scroll|enterAlways" />

        <com.google.android.material.tabs.TabLayout
            android:id="@+id/tabLayout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:tabMode="fixed">

            <com.google.android.material.tabs.TabItem
                android:id="@+id/tab1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/tab_text_1" />

            <com.google.android.material.tabs.TabItem
                android:id="@+id/tab2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/tab_text_2" />

            <com.google.android.material.tabs.TabItem
                android:id="@+id/tab3"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/tab_text_3" />
        </com.google.android.material.tabs.TabLayout>
    </com.google.android.material.appbar.AppBarLayout>

    <androidx.viewpager.widget.ViewPager
        android:id="@+id/view_pager"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

</androidx.coordinatorlayout.widget.CoordinatorLayout>

制表符布局(同样,除文本外,其他都相同:]:>

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <TextView
        android:id="@+id/textTab"
        android:layout_width="369dp"
        android:layout_height="54dp"
        android:layout_alignParentStart="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_alignParentEnd="true"
        android:layout_marginStart="27dp"
        android:layout_marginLeft="27dp"
        android:layout_marginTop="0dp"
        android:layout_marginEnd="15dp"
        android:text="@string/tab_text_1"
        android:textSize="30sp"
        android:layout_alignParentRight="true"
        android:layout_marginRight="15dp" />

</RelativeLayout>

colors.xml:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="colorPrimary">#008577</color>
    <color name="colorPrimaryDark">#00574B</color>
    <color name="colorAccent">#D81B60</color>
</resources>

styles.xml:

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>

    <style name="AppTheme.NoActionBar">
        <item name="windowActionBar">false</item>
        <item name="windowNoTitle">true</item>
    </style>

    <style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar" />

    <style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light" />

</resources>

为了更好地说明我的意思,这是activity_main的设计以及它的外观:

以下是实际发生的情况:enter image description here

enter image description hereenter image description here

每页的文字显示很好,但标题没显示。 :/

我正在创建带有标签菜单的应用,但是标签标题显示不正确。我尝试重新阅读并再次阅读到目前为止所看过的每个教程,以及将我的代码与其他人进行比较...

java android android-fragments android-tablayout android-tabs
2个回答
0
投票

在activity_main.xml中,从appbarlayout()中删除android:theme =“ @ style / AppTheme.AppBarOverlay。我认为是文本颜色问题。它与appbar的颜色相同。因此它没有显示。如果您更改主题,可能您的文字将出现。


0
投票

用此替换选项卡布局

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