我想在android.I中使用我自己的字体导航抽屉。根据这个答案使用android自带的工作室：https://stackoverflow.com/a/23632492/4393226。但我不知道如何更改字体并使其成为RTL。我搜索了很多，我发现了如何制作抽屉RTL。我用这个代码：
getWindow().getDecorView().setLayoutDirection(View.LAYOUT_DIRECTION_RTL);
和Android - Is Navigation Drawer from right hand side possible?
但正如您所知，这仅适用于API 17及更高版本。请帮忙！如何更改菜单字体？如何以正确的方式进行布局RTL？！
编辑：我的字体“TTF”文件是资产/字体，我知道如何使用java设置文本视图，但我不知道如何将其设置为导航抽屉菜单。
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);
}
然后添加调用您刚刚在活动中添加的方法：
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);
}
您可以更轻松地完成此操作。
首先进入style.xml并创建一个新样式。
<style name="RobotoTextViewStyle" parent="android:Widget.TextView">
<item name="android:fontFamily">@font/sans-serif-smallcaps</item>
</style>
第二个是转到导航xml代码并将项目文本外观放在那里。
app:itemTextAppearance="@style/RobotoTextViewStyle"
现在你的最终导航代码应该是这个。
<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" />
第1步：在style.xml中按如下方式创建样式
<style name="NavigationView" >
<item name="fontFamily">@font/helvetica_neue_light</item>
</style>
第2步：在android.support.design.widget.NavigationView中添加样式作为主题
机器人：主题= “@风格/ NavigationView”
添加到rischan的答案。
我直接编辑了'mi'，因为这些是我的抽屉菜单标题。然后我更改了s.setSpan 1st参数以使用自定义类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);
}
}
无法相信改变菜单字体的复杂程度。
谢谢！我已经成功更改了基于@Amir H post的导航抽屉上的字体但是配置了（只需在您的活动中添加这几行）
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);
}
}
}
也许它会帮助别人:)
它仅适用于字体
colors.xml的res->values->colors.xml文件中添加您的字体颜色（如果您想更改）
<color name="black">#000000</color> // it's for black don't go for white color
style.xml文件（有两个文件编辑该文件，其主题为name="your_theme"样式或在该两个文件中查找行<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>
请注意，为此标记指定的名称是MyText。现在我们必须在上面的第一个样式块中使用此名称，其名称是您的应用主题。<!-- 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>