我希望在Android的导航抽屉中使用自己的字体。根据这个答案，我使用了Android Studio自带的库：https://dev59.com/uGEh5IYBdhLWcg3w_nuv#23632492。 但是我不知道如何更改字体并使其从右向左排版（RTL）。 我进行了大量搜索，发现了如何使抽屉从右向左排版。我使用了以下代码：
getWindow().getDecorView().setLayoutDirection(View.LAYOUT_DIRECTION_RTL);
但是您知道，这仅适用于API 17及以上版本。 请帮忙！如何更改菜单字体？如何以正确的方式将布局设置为RTL？！
编辑：： 我的字体“TTF”文件位于assets / fonts中，我知道如何在Java中为TextView设置它，但我不知道如何将其设置为导航抽屉菜单。
你可以用更简单的方法来完成这个操作。
首先进入style.xml文件，在其中创建一个新的样式。
<style name="RobotoTextViewStyle" parent="android:Widget.TextView">
<item name="android:fontFamily">@font/sans-serif-smallcaps</item>
</style>
第二步是前往您的导航 XML 代码并在此处放置项目文本外观。
app:itemTextAppearance="@style/RobotoTextViewStyle"
现在你的最终导航代码应该是这样的。
<android.support.design.widget.NavigationView
android:id="@+id/nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
app:itemTextAppearance="@style/RobotoTextViewStyle"
android:fitsSystemWindows="true"
app:headerLayout="@layout/nav_header_home"
app:menu="@menu/activity_home_drawer" />
我找到了答案：
首先在你的项目中创建这个类：
import android.graphics.Paint;
import android.graphics.Typeface;
import android.text.TextPaint;
import android.text.style.TypefaceSpan;
public class CustomTypefaceSpan extends TypefaceSpan {
private final Typeface newType;
public CustomTypefaceSpan(String family, Typeface type) {
super(family);
newType = type;
}
@Override
public void updateDrawState(TextPaint ds) {
applyCustomTypeFace(ds, newType);
}
@Override
public void updateMeasureState(TextPaint paint) {
applyCustomTypeFace(paint, newType);
}
private static void applyCustomTypeFace(Paint paint, Typeface tf) {
int oldStyle;
Typeface old = paint.getTypeface();
if (old == null) {
oldStyle = 0;
} else {
oldStyle = old.getStyle();
}
int fake = oldStyle & ~tf.getStyle();
if ((fake & Typeface.BOLD) != 0) {
paint.setFakeBoldText(true);
}
if ((fake & Typeface.ITALIC) != 0) {
paint.setTextSkewX(-0.25f);
}
paint.setTypeface(tf);
}
}
然后将此方法添加到您想要更改导航抽屉菜单字体的活动中：
private void applyFontToMenuItem(MenuItem mi) {
Typeface font = Typeface.createFromAsset(getAssets(), "ds_digi_b.TTF");
SpannableString mNewTitle = new SpannableString(mi.getTitle());
mNewTitle.setSpan(new CustomTypefaceSpan("" , font), 0 , mNewTitle.length(), Spannable.SPAN_INCLUSIVE_INCLUSIVE);
mi.setTitle(mNewTitle);
}
然后在你的活动中调用你刚刚添加的方法：
navView = (NavigationView) findViewById(R.id.navView);
Menu m = navView.getMenu();
for (int i=0;i<m.size();i++) {
MenuItem mi = m.getItem(i);
//for aapplying a font to subMenu ...
SubMenu subMenu = mi.getSubMenu();
if (subMenu!=null && subMenu.size() >0 ) {
for (int j=0; j <subMenu.size();j++) {
MenuItem subMenuItem = subMenu.getItem(j);
applyFontToMenuItem(subMenuItem);
}
}
//the method we have create in activity
applyFontToMenuItem(mi);
}
步骤1：在style.xml中设置样式如下
<style name="NavigationView" >
<item name="fontFamily">@font/helvetica_neue_light</item>
</style>
步骤2：将样式添加为主题到您的android.support.design.widget.NavigationView中
android:theme="@style/NavigationView"
补充rischan的答案。
我直接编辑了'mi'，因为那些是我的抽屉菜单标题。然后，我将s.setSpan的第一个参数更改为使用自定义类CustomTypefaceSpan。
// Navigation View
NavigationView navigationView = (NavigationView)
findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
Menu m = navigationView .getMenu();
Typeface tf1 = Typeface.createFromAsset(getAssets(), "font/Gotham Narrow Extra Light.otf");
for (int i=0;i<m.size();i++) {
MenuItem mi = m.getItem(i);
SpannableString s = new SpannableString(mi.getTitle());
s.setSpan(new CustomTypefaceSpan("", tf1), 0, s.length(),
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
mi.setTitle(s);
}
CustomTypefaceSpan类：
package my.app;
import android.graphics.Paint;
import android.graphics.Typeface;
import android.text.TextPaint;
import android.text.style.TypefaceSpan;
public class CustomTypefaceSpan extends TypefaceSpan {
private final Typeface newType;
public CustomTypefaceSpan(String family, Typeface type) {
super(family);
newType = type;
}
@Override
public void updateDrawState(TextPaint ds) {
applyCustomTypeFace(ds, newType);
}
@Override
public void updateMeasureState(TextPaint paint) {
applyCustomTypeFace(paint, newType);
}
private static void applyCustomTypeFace(Paint paint, Typeface tf) {
int oldStyle;
Typeface old = paint.getTypeface();
if (old == null) {
oldStyle = 0;
} else {
oldStyle = old.getStyle();
}
int fake = oldStyle & ~tf.getStyle();
if ((fake & Typeface.BOLD) != 0) {
paint.setFakeBoldText(true);
}
if ((fake & Typeface.ITALIC) != 0) {
paint.setTextSkewX(-0.25f);
}
paint.setTypeface(tf);
}
}
简直无法相信只是更改菜单字体有多么复杂。
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
Menu m = navigationView .getMenu();
for (int i=0;i<m.size();i++) {
MenuItem mi = m.getItem(i);
//for applying a font to subMenu ...
SubMenu subMenu = mi.getSubMenu();
if (subMenu!=null && subMenu.size() >0 ) {
for (int j=0; j <subMenu.size();j++) {
MenuItem subMenuItem = subMenu.getItem(j);
SpannableString s = new SpannableString(subMenuItem.getTitle());
s.setSpan(new TypefaceSpan("fonts/yourfontname.ttf"), 0, s.length(),
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
subMenuItem.setTitle(s);
}
}
}
仅适用于字体
First Of All Add color of your font (if you want to change) in colors.xml file located at res->values->colors.xml like
<color name="black">#000000</color> // it's for black don't go for white color
Then edit style.xml file located at same values directory (there are two files edit that file which having your theme with style name="your_theme" or find line in that two file
Here we have to set font property. So you have to create new style tag in enclosing resource tags. in my case I create
<style name="MyText" parent="@android:style/TextAppearance.Medium">
<item name="android:textSize">20sp</item> //size of font
<item name="android:textColor">@color/black</item> //color of font
<item name="android:typeface">sans</item> // type how it appear
</style>
Note that Name given for this tag is MyText. Now we have to use this name in aboved first style block whose name is your appication theme.
Mentioned this new style in above appication theme style tag. In my case its like
<!-- 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>
<item name="android:textViewStyle">@style/MyText</item> //MyText its custom style for font
</style>
首先，在res>>values文件夹下创建一个名为style.xml的XML文件。
然后，在<resource><style name="mynavigationfont" > <item name="fontFamily">@font/sans-serif</item> </style> </resource>下方复制并添加以下代码：
注意：将此代码添加在<resource ...这里.. if >中。
<?xml version="1.0" encoding="UTF-8"?>
如果不加这个，可能会显示错误
最后，在你的XML中添加这个
<android.support.design.widget.NavigationView
android:id="@+id/nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
app:itemTextAppearance="@style/RobotoTextViewStyle"
android:fitsSystemWindows="true"
app:headerLayout="@layout/nav_header_home"
app:menu="@menu/activity_home_drawer" />
这行代码 - app:itemTextAppearance="@style/mynavigationfont"