如何更改导航抽屉字体？

Question

我想在android中使用我自己的字体导航抽屉.我根据这个答案使用了android studio附带的库: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 - 右侧的导航抽屉可能吗？

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.

Answer 1

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);
}

Answer 2

您可以以更简单的方式执行此操作。

首先进入style.xml并在那里创建新样式。

 <style name="RobotoTextViewStyle" parent="android:Widget.TextView">
      <item name="android:fontFamily">@font/sans-serif-smallcaps</item>
 </style>

第二个是转到您的导航xml代码，并将项目文本外观放在此处。

app:itemTextAppearance="@style/RobotoTextViewStyle"

现在您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" />

Answer 3

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"

Answer 4

添加到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.

Answer 5

谢谢！我已基于@Amir H帖子成功更改了导航抽屉上的字体，但已进行了配置（只需将这几行添加到您的活动中）

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);
                }
            }

        }

也许会帮助某人:)