如何在 androidx 抽屉布局小部件中更改字体大小和颜色

Question

见下图我想更改放置在菜单中的标记页脚区域文本的字体大小和颜色。我不想使用android.support.design.widget.NavigationView，我知道我可以通过使用它来更改它。请帮帮我。

或

如果有其他方法可以添加页脚区域，就像我们设置页眉区域属性（app:headerLayout="@layout/nav_header_main"）一样？

这是我的主要 XML 代码：

<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.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:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:openDrawer="start">

    <include
        layout="@layout/app_bar_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <com.google.android.material.navigation.NavigationView
        android:id="@+id/nav_view"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:fitsSystemWindows="true"
        android:theme="@style/menuTextStyle"
        android:background="@color/colorBlack"
        app:itemTextColor="@color/colorWhite"
        app:itemIconTint="@color/colorWhite"
        app:headerLayout="@layout/nav_header_main"
        app:menu="@menu/activity_main_drawer" />
</androidx.drawerlayout.widget.DrawerLayout>

这里是activity_main_drawer.xml代码：

<?xml version="1.0" encoding="utf-8"?>
<menu 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"
    tools:showIn="navigation_view">

    <group android:checkableBehavior="single">
        <item
            android:id="@+id/nav_home"
            android:title="Home" />
        <item
            android:id="@+id/nav_my_pets"
            android:title="My Pets" />
        <item
            android:id="@+id/nav_my_stores"
            android:title="My Stores" />
        <item
            android:id="@+id/nav_my_products"
            android:title="My Products" />
        <item
            android:id="@+id/nav_promotions"
            android:title="Promotions" />
        <item
            android:id="@+id/nav_faqs"
            android:title="FAQs" />

        <item
            android:id="@+id/nav_account"
            android:title="My Account" />
        <item
            android:id="@+id/nav_notifications"
            android:title="Notifications" />
        <item
            android:id="@+id/nav_about"
            android:title="About" />
        <item
            android:id="@+id/nav_settings"
            android:title="Settings"
            android:visible="false" />
        <item
            android:id="@+id/nav_forum"
            android:title="Forum" />
        <item
            android:id="@+id/nav_terms"
            android:title="Privacy/Terms" />
        <item
            android:id="@+id/nav_logout"
            android:title="Logout" />
    </group>
    <group android:checkableBehavior="none">
            <item
                android:id="@+id/subtitle2"
                android:title="by:">
                <menu>
                    <item
                        android:id="@+id/nav_footer1"
                        android:checkableBehavior="none"
                        android:title="by:" />
                    <item
                        android:id="@+id/nav_footer2"
                        android:checkableBehavior="none"
                        android:title="afterdarkgrafx.com" />
                </menu>
            </item>
    </group>
</menu>

Answer 1

您可以使用：

• RelativeSizeSpan 用于设置默认菜单项文本大小的百分比。

// Java
private void setMenuTextSize(MenuItem item, float proportion) {
    SpannableString spanString = new SpannableString(item.getTitle().toString());
    spanString.setSpan(new RelativeSizeSpan(proportion), 
                          0, spanString.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    item.setTitle(spanString);
}

// Kotlin
private fun setMenuTextSize(item: MenuItem, proportion: Float) {
    val spanString = SpannableString(item.title.toString())
    spanString.setSpan(
        RelativeSizeSpan(proportion),
        0, spanString.length, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
    )
    item.title = spanString
}

• AbsoluteSizeSpan 用于将文本大小设置为物理像素。

// Java
private void setMenuTextSize(MenuItem item, int textSize) {
    SpannableString spanString = new SpannableString(item.getTitle().toString());
    spanString.setSpan(new AbsoluteSizeSpan(textSize), 0, spanString.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    item.setTitle(spanString);
}

// Kotlin
private fun setMenuTextSize(item: MenuItem, textSize: Int) {
    val spanString = SpannableString(item.title.toString())
    spanString.setSpan(
        AbsoluteSizeSpan(textSize),
        0,
        spanString.length,
        Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
    )
    item.title = spanString
}

从 sp 转换为像素：

// Java
public static int spToPx(int sp) {
    return (int) (sp * Resources.getSystem().getDisplayMetrics().scaledDensity);
}

// Kotlin 
fun spToPx(sp: Int) = (sp * Resources.getSystem().displayMetrics.scaledDensity).toInt()

在您的菜单上应用它：

// Java
private void reduceItemSize(NavigationView navView) {
    Menu menu = navView.getMenu();
    MenuItem item = menu.findItem(R.id.subtitle2);
    SubMenu subMenu = item.getSubMenu();
    MenuItem footer1Item = subMenu.findItem(R.id.nav_footer1);
    MenuItem footer2Item = subMenu.findItem(R.id.nav_footer2);

    // Using RelativeSizeSpan
    setMenuTextSize(footer1Item, 0.8f);
    setMenuTextSize(footer2Item, 0.8f);

    // Using AbsoluteSizeSpan
    setMenuTextSize(footer1Item, spToPx(12));
    setMenuTextSize(footer2Item, spToPx(12));
}

// Kotlin
private fun reduceItemSize(navView: NavigationView) {
    val menu = navView.menu
    val item = menu.findItem(R.id.subtitle2)
    val subMenu = item.subMenu
    val footer1Item = subMenu.findItem(R.id.nav_footer1)
    val footer2Item = subMenu.findItem(R.id.nav_footer2)

    // Using RelativeSizeSpan
    setMenuTextSize(footer1Item, 0.8f)
    setMenuTextSize(footer2Item, 0.8f)

    // Using AbsoluteSizeSpan
    setMenuTextSize(footer1Item, spToPx(12))
    setMenuTextSize(footer2Item, spToPx(12))
}