how to prevent system font-size changing effects to nativescript-angular android application

Issue

The problem is when i adjusted the android device system font-size, my
user application’s font-sizes are changing to device system font-size
how to prevent it

Solution

The default unit for font size in Android is Scaled Pixels, setting it to DIP or PX will prevent auto scaling.

Tested against v6.0

import { isAndroid } from 'tns-core-modules/platform';
import { TextBase } from 'tns-core-modules/ui/text-base/text-base';

declare var android; // required if tns-platform-declarations is not installed

if (isAndroid) {
    TextBase.prototype[require("tns-core-modules/ui/text-base/text-base-common").fontSizeProperty.setNative] = function (value) {
        if (!this.formattedText || (typeof value !== "number")) {
            if (typeof value === "number") {
                this.nativeTextViewProtected.setTextSize(android.util.TypedValue.COMPLEX_UNIT_DIP, value);
            }
            else {
                this.nativeTextViewProtected.setTextSize(android.util.TypedValue.COMPLEX_UNIT_PX, value.nativeSize);
            }
        }
    };
}

Since you are using Angular, you may place this code in main.ts Or in app module.

Answered By – Manoj

Answer Checked By – Candace Johnson (AngularFixing Volunteer)