防止自定义系统 fonts 覆盖应用程序 fonts

Question

Devices like Samsung allows users to set custom system fonts . Issue is that those fonts can be overriding my app fonts . I mean if I set Arial font in my app and I've set Calibri font as system font on my mobile then Arial will be overridden by the Calibri font .

How to prevent this situation?

Answer 1

• "If you need to set one font for all TextView's in your Android application you can use this solution.

• It will override ALL TextView's typefaces, including the Action Bar , custom system fonts and other standard components, but EditText's password font won't be overridden." (For obvious reasons).

• Using reflection to override default typeface and the Application class.

• NOTE: DO NOT FORGET TO SET TYPEFACE FOR APP THEME AS DEFAULT TYPEFACE WHICH WILL BE OVERRIDDEN

MyApp.java :

public class MyApp extends Application {

  @Override
  public void onCreate() {
    TypefaceUtil.overrideFont(getApplicationContext(), "SERIF", "fonts/Roboto-Regular.ttf"); // font from assets: "assets/fonts/Roboto-Regular.ttf
  }
}

res/themes.xml :

<?xml version="1.0" encoding="utf-8"?>
<resources>
  <style name="MyAppTheme" parent="@android:style/Theme.Holo.Light">
    <!-- you should set typeface which you want to override with TypefaceUtil -->
    <item name="android:typeface">serif</item>
  </style>
</resources>

TypefaceUtil.java :

import android.content.Context;
import android.graphics.Typeface;
import android.util.Log;

import java.lang.reflect.Field;

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 {
            final Typeface customFontTypeface = Typeface.createFromAsset(context.getAssets(), customFontFileNameInAssets);

            final Field defaultFontTypefaceField = Typeface.class.getDeclaredField(defaultFontNameToOverride);
            defaultFontTypefaceField.setAccessible(true);
            defaultFontTypefaceField.set(null, customFontTypeface);
        } catch (Exception e) {
            Log.e("Can not set custom font " + customFontFileNameInAssets + " instead of " + defaultFontNameToOverride);
        }
    }
}

assets/fonts/Roboto-Regular.ttf:

Put your font here eg Arial .

ref1

Author Artem Zinnatullin