KOTLIN-BottomNavigationBar中的第一项不可见，标题问题 [英] KOTLIN - First item in BottomNavigationBar isn't visible, title issues

问题描述

我有一个带有5个项目的BottomNavigationBar.除名称和图标外，第一项与其余项相同.这是bottom_nav菜单的xml

I have a BottomNavigationBar with 5 items. The first item is the same as the rest, apart from the name and icon. Here is the xml for the bottom_nav menu

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">

    <item
        android:id="@+id/name_configuration"
        android:title="Name Mech"
        android:icon="@drawable/ic_action_name"
        />

    <item
        android:id="@+id/mech_skills"
        android:title="Skills"
        android:icon="@drawable/ic_action_skills"
        />

    <item
        android:id="@+id/stat_hub"
        android:title="Stat Hub"
        android:icon="@drawable/ic_action_stats"
        />

    <item
        android:id="@+id/mech_weapons"
        android:title="Weapons"
        android:icon="@drawable/ic_action_weapon"
        />

    <item
        android:id="@+id/mech_systems"
        android:title="Systems"
        android:icon="@drawable/ic_action_system"
        />
</menu>

这是我用于图标的可绘制对象的xml

And here is the xml for the drawable I am using for the icons

<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="24dp"
    android:height="24dp"
    android:viewportWidth="24"
    android:viewportHeight="24"
    android:tint="#FFFFFF"
    android:alpha="0.8">
    <path
        android:fillColor="#FF000000"
        android:pathData="M3,17.25V21h3.75L17.81,9.94l-3.75,-3.75L3,17.25zM20.71,7.04c0.39,-0.39 0.39,-1.02 0,-1.41l-2.34,-2.34c-0.39,-0.39 -1.02,-0.39 -1.41,0l-1.83,1.83 3.75,3.75 1.83,-1.83z"/>
</vector>

最后，这是我用于Bar本身的xml

Lastly, here is the xml that I use to for the Bar itself

<com.google.android.material.bottomnavigation.BottomNavigationView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/btm_nav"
        app:layout_constraintBottom_toBottomOf="parent"
        android:background= "@color/colorPrimary"
        app:menu="@menu/bottom_nav"/>

其余可绘制对象的xml完全相同(它们使用不同的图标，但这与xml本身无关).但是，name_configuration项在底部导航栏中不可见.单击时，它的行为与其他项目相同(它们传递SharedPreferences值并移至不同的活动)，只是不可见.但是，当按下底部导航栏上的其他按钮时，在应用程序进入下一个活动之前，名称"按钮将短暂变为正确的颜色/透明度，并且名称"按钮再次变为不可见.

The xml for the rest of the drawables is the exact same (they use different icons but that's not relevant in the xml itself). However, the name_configuration item is invisible in the bottom navigation bar. It behaves the same as the other items when clicked (they pass SharedPreferences values and move to different activities), it is just invisible. However, when other buttons on the bottom navigation bar are pressed, the Name button briefly becomes the right color/transparency before the app goes to the next activity and the Name button becomes invisible again.

此外，Name Mech的标题是底部导航栏中任何按钮出现的唯一标题. "Name Mech"出现在底部导航栏中的图标下方，但是"Skills"，"StatHub"，"Weapons"和"Systems"没有出现在底部导航栏中的相应图标下方.

Additionally, the title for Name Mech is the only title that appears for any of the buttons in the bottom navigation bar. "Name Mech" appears below the icon in the bottom navigation bar, but "Skills", "StatHub", "Weapons", and "Systems" do not appear under their respective icons in the bottom navigation bar.

任何指导将不胜感激.

推荐答案

我遇到了同样的问题，但是现在我的代码可以正常工作了.试试我的代码:

I had the same problem, but now my code works correctly. Try my code:

在build.gradle(:app)中:

In build.gradle(:app):

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
    implementation 'com.android.support:design:28.0.0'
}

在XML中:

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout android:layout_height="match_parent"
    android:layout_width="match_parent"
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/navigationView"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginEnd="0dp"
        android:layout_marginStart="0dp"
        android:background="?android:attr/windowBackground"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:itemBackground="@color/colorPrimary"
        app:itemIconTint="#fff"
        app:itemTextColor="#fff"
        app:menu="@menu/menu"
        app:labelVisibilityMode="unlabeled"/>
</androidx.constraintlayout.widget.ConstraintLayout>

这篇关于KOTLIN-BottomNavigationBar中的第一项不可见，标题问题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！