在Android中的NavigationView项目中添加字体大小

Question

当我选择一个项目时，在navigationView中，所选项目应为粗体并增加字体大小。 我该如何实现？

基本上，我想为导航项添加一个选择器，该选择器将在选定状态下显示粗体字体，在未选定状态下显示普通字体。

谢谢

Answer 1

Styles.xml

    <style name="NavDrawerTextStyle" parent="Base.TextAppearance.AppCompat">
    <item name="android:textColor">@color/colorPrimaryDark</item>
    <item name="android:textSize">30sp</item>
    <item name="android:textStyle">bold</item>
    </style>

然后在NavigationView中：

    <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:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:openDrawer="start">

    <android.support.design.widget.NavigationView
        ...
        app:itemTextAppearance="@style/NavDrawerTextStyle"
         />

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

Answer 2

尝试如下

    //put this in main Activity
private void setFontToMenuItem(MenuItem mi) {

    Typeface font = Typeface.createFromAsset(getAssets(), "fonts/customfont.ttf");
    SpannableString mNewTitle = new SpannableString(mi.getTitle());
    mNewTitle.setSpan(new CustomTypefaceSpan("" , font), 0 , mNewTitle.length(),  Spannable.SPAN_INCLUSIVE_INCLUSIVE);
    mi.setTitle(mNewTitle);
}

这样使用

navigationView = (NavigationView) findViewById(R.id.navigation_view);
    Menu m = navigationView.getMenu();
    for (int i=0;i<m.size();i++) {
        MenuItem item = m.getItem(i);

        //for aapplying a font to subMenu ...
        SubMenu subMenu = item.getSubMenu();
        if (subMenu!=null && subMenu.size() >0 ) {
            for (int j=0; j <subMenu.size();j++) {
                MenuItem subMenuItem = subMenu.getItem(j);
                setFontToMenuItem(subMenuItem);
            }
        }

        //the method we have create in activity
        setFontToMenuItem(item);
    }