如何更改字体样式或覆盖默认字体样式以在Xamarin.Android中完成应用程序 [英] How to change font style or override default font style for complete Application in Xamarin.Android

问题描述

我发现有很多帖子说使用 FontAttribute =""Font_Syle.tff#Font_Style" 从xaml文件中静态更改每个 label/entry/button/etc等的字体样式>或通过为每个属性(例如 label/entry/button/etc &分别为每个人更改 TypeFace .

I found many post saying to change font style of every label/entry/button/etc etc statically from xaml files using FontAttribute="Font_Syle.tff#Font_Style" or by making the custom renderer for every of property like label/entry/button/etc & change TypeFace for everyone of it individually.

[assembly: ExportRenderer(typeof(Label), typeof(CustomLabel))]
namespace *******.Droid.Renderers
{
    public class CustomLabel : LabelRenderer
    {
        protected override void OnElementChanged(ElementChangedEventArgs<Label> e)
        {
            base.OnElementChanged(e);

            var label = (TextView)Control;
            Typeface font = Typeface.CreateFromAsset(Forms.Context.Assets, "Montserrat_Regular.ttf");
            label.Typeface = font;
        }
    }
}

但是在将字体设置为对话框，进度对话框，标题，以编程方式静态创建的列表等方面存在问题.

But there was a problem in setting the font to dialog boxes, progress dialogs, titles, statically created List by programmatically, etc.

推荐答案

最后找到了解决方案，可以更改整个应用程序的字体.

Finally found a solution to do so, which can change the font of the complete application.

(有很多针对Java的解决方案，但C#中没有解决方案，因此请在此处发布，这可能会对将来的人有所帮助)

(There are many solutions for Java but none in C# soo posting it here, it might be helpful for someone in future)

代码段

1. 将其添加到Resource/values/style.xml中.请记住将其放置在您的应用主题的主父 STYLE 中.

    <item name="android:typeface">serif</item>

1. 在Droid项目中创建新文件名 TypefaceUtil

using Android.Content;
using Android.Graphics;
using Java.Lang;

namespace ***********.Droid
{
    public class TypefaceUtil
    {

        /**
         * Using reflection to override default typeface
         * NOTICE: DO NOT FORGET TO SET TYPEFACE FOR APP THEME AS DEFAULT TYPEFACE WHICH WILL BE OVERRIDDEN
         * @param context to work with assets
         * @param defaultFontNameToOverride for example "monospace"
         * @param customFontFileNameInAssets file name of the font from assets
         */
        public static void overrideFont(Context context, string defaultFontNameToOverride, string customFontFileNameInAssets)
        {
            try
            {
                var typeFace = Class.FromType(typeof(Typeface));
                var customfont = Typeface.CreateFromAsset(context.Assets, customFontFileNameInAssets);
                var font = typeFace.GetDeclaredField(defaultFontNameToOverride);
                font.Accessible = true;
                font.Set(null, customfont);
            }
            catch (System.Exception e)
            {
                var error = e.Message;
            }
        }
    }
}

1. 在扩展Application的MainActivity中，调用上面创建的方法.

public class MainApplication : Application
{
   public override void OnCreate()
        {
            base.OnCreate();
            TypefaceUtil.overrideFont(Context, "SERIF", "Montserrat_Regular.ttf"); // font from assets: "assets/fonts/Montserrat_Regular.ttf
   }
}

注意:将您的Font tff文件放置在Resource的Asset文件夹中

Note: Place your Font tff file in Asset folder of Resource

仅此而已，所有字体都已设置&准备出发了:)

That's all, font is all set & ready to go :)

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