我在我的android页面中创建了一个底栏导航。但现在我想在底部导航文本中应用自定义字体系列。
这是.xml文件中的底部导航代码：
<android.support.design.widget.BottomNavigationView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/bottomNavView_Bar"
android:background="@drawable/white_grey_border_top"
app:menu="@menu/bottom_navigation_menu">
</android.support.design.widget.BottomNavigationView>
另外，bottom_navigation_menu.xml中的代码：
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
>
<item
android:id="@+id/ic_newsfeed"
android:icon="@drawable/ic_menu_camera"
android:title="NEWSFEED"
/>
<item
android:id="@+id/ic_explorer"
android:icon="@drawable/ic_home_black_24dp"
android:title="EXPLORER"
/>
<item
android:id="@+id/ic_notify"
android:icon="@drawable/ic_notifications_black_24dp"
android:title="NOTIFY"
/>
<item
android:id="@+id/ic_more"
android:icon="@drawable/ic_dashboard_black_24dp"
android:title="MORE"
/>
</menu>
帮助将不胜感激。
提前致谢！
在res / font /文件夹中添加字体文件以将字体捆绑为资源
然后
您可以使用样式资源更改它。在styles.xml中：
<style name="Widget.BottomNavigationView"
parent="Widget.Design.BottomNavigationView">
<item name="fontFamily">@font/your_font</item>
</style>
然后将其作为主题应用于您的视图中：
<android.support.design.widget.BottomNavigationView
...
android:theme="@style/Widget.BottomNavigationView"
/>
刚刚检查我的应用程序，它工作正常。
参考：https://developer.android.com/guide/topics/ui/look-and-feel/fonts-in-xml.html#fonts-in-code
在你的布局中：
<com.google.android.material.bottomnavigation.BottomNavigationView
...
app:itemTextAppearanceActive="@style/BottomNavigationViewTextStyle"
app:itemTextAppearanceInactive="@style/BottomNavigationViewTextStyle"
... />
在styles.xml中：
<style name="BottomNavigationViewTextStyle">
...
<item name="android:fontFamily">@font/whatever_font</item>
...
</style>
这可以通过覆盖BottomNavigationView类的onLayout方法然后使用扩展标记来完成。此方法还显示所有菜单标题并禁用移位。
public final class ExtendedBottomNavigationView extends BottomNavigationView{
private final Context context;
private Typeface fontFace = null;
public ExtendedBottomNavigationView(Context context, AttributeSet attrs){
super(context, attrs);
this.context = context;
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom){
super.onLayout(changed, left, top, right, bottom);
final ViewGroup bottomMenu = (ViewGroup)getChildAt(0);
final int bottomMenuChildCount = bottomMenu.getChildCount();
BottomNavigationItemView item;
View itemTitle;
Field shiftingMode;
if(fontFace == null){
fontFace = Typeface.createFromAsset(context.getAssets(), context.getString(R.string.VazirBold));
}
try {
//if you want to disable shiftingMode:
//shiftingMode is a private member variable so you have to get access to it like this:
shiftingMode = bottomMenu.getClass().getDeclaredField("mShiftingMode");
shiftingMode.setAccessible(true);
shiftingMode.setBoolean(bottomMenu, false);
shiftingMode.setAccessible(false);
} catch (NoSuchFieldException e){
e.printStackTrace();
} catch (IllegalAccessException e){e.printStackTrace();}
for(int i=0; i<bottomMenuChildCount; i++){
item = (BottomNavigationItemView)bottomMenu.getChildAt(i);
//this shows all titles of items
item.setChecked(true);
//every BottomNavigationItemView has two children, first is an itemIcon and second is an itemTitle
itemTitle = item.getChildAt(1);
//every itemTitle has two children, first is a smallLabel and second is a largeLabel. these two are type of AppCompatTextView
((TextView)((BaselineLayout) itemTitle).getChildAt(0)).setTypeface(fontFace, Typeface.BOLD);
((TextView)((BaselineLayout) itemTitle).getChildAt(1)).setTypeface(fontFace, Typeface.BOLD);
}
}
}
然后像这样使用它：
<your.package.name.ExtendedBottomNavigationView android:id="@id/bottomMenu" style="@style/bottomMenu"/>
根据https://material.io/develop/android/components/bottom-navigation-view/，只需为TextAppearance.MaterialComponents.Caption样式设置fontFamily项，它就会正常工作。 com.google.android.material.bottomnavigation.BottomNavigationView默认使用此功能。
只知道依赖TextAppearance.MaterialComponents.Caption的其他组件也会被更改，但这可能是可取的。
<style name="TextAppearance.MaterialComponents.Caption" parent="AppMaterialComponentsTheme">
<item name="fontFamily">@font/example</item>
</style>
public void setNavigationTypeface() {
final Typeface avenirHeavy = Typeface.createFromAsset(this.getAssets(), "font2/Avenir-Heavy.ttf"); //replace it with your own font
ViewGroup navigationGroup = (ViewGroup) bottomNavView.getChildAt(0);
for (int i = 0; i < navigationGroup.getChildCount(); i++) {
ViewGroup navUnit = (ViewGroup) navigationGroup.getChildAt(i);
for (int j = 0; j < navUnit.getChildCount(); j++) {
View navUnitChild = navUnit.getChildAt(j);
if (navUnitChild instanceof BaselineLayout) {
BaselineLayout baselineLayout = (BaselineLayout) navUnitChild;
for (int k = 0; k < baselineLayout.getChildCount(); k++) {
View baselineChild = baselineLayout.getChildAt(k);
if (baselineChild instanceof TextView) {
TextView textView = (TextView) baselineChild;
textView.setTypeface(avenirHeavy);
}
}
}
}
}
}
如果您在资源文件夹中有CustomFont，并且想要在底部导航中设置，请使用此代码
public class Font extends AppCompatActivity {
public static void persian_iran_font(final Context context, final View v) {
try {
if (v instanceof ViewGroup) {
ViewGroup vg = (ViewGroup) v;
for (int i = 0; i < vg.getChildCount(); i++) {
View child = vg.getChildAt(i);
persian_iran_font(context, child);
}
} else if (v instanceof TextView) {
((TextView) v).setTypeface(Typeface.createFromAsset(context.getAssets(), "teshrinarmedium.otf"));
}
} catch (Exception e) {
}
}
}
然后在MainActivity中使用Font Class
BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.navigation);
Font.persian_iran_font(getApplicationContext(), navigation);
祝好运
如果要在选择时动态更改文本选择，可以执行bottomNav.itemTextAppearanceActive = R.style.yourstyle