android – 如何更改导航抽屉字体？

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为textview设置它,但我不知道如何将其设置为导航抽屉菜单.

解决方法:

我找到了答案：
首先在项目中创建此类：

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);
}

标签：android,fonts,navigation-drawer,right-to-left
来源： https://codeday.me/bug/20191004/1852727.html