nativescript-fast-android-r
Your awesome NativeScript plugin.
npm i --save nativescript-fast-android-r

nativescript-fast-android-r

In {N}, querying android.R, like using android.R.integer.config_longAnimTime, will cause an UI lag for over 500ms the first time it's called. R is a big class with many child static classes, so yhis slowdown may be because {N} loads all the R class metadata at runtime.

This plugin provides the proxy object androidR that uses Reflection to query the static class integer and field config_longAnimTime to return the value.

Installation

tns plugin add nativescript-fast-android-r

Usage

To use this plugin, simply import androidR and use it like you'd use android.R

import { androidR } from "nativescript-fast-android-r";
console.log(androidR.integer.config_longAnimTime);

Peformance

Querying android.R for the first time takes usually from 400-800ms, and a negligible time from then onwards.

console.log(android.R.integer.config_longAnimTime); // 400-800ms
console.log(android.R.integer.config_longAnimTime); // ~0ms
console.log(android.R.integer.config_shortAnimTime); // ~0ms
console.log(android.R.integer.config_shortAnimTime); // ~0ms
console.log(android.R.transition.explode); // ~0ms
console.log(android.R.transition.explode); // ~0ms

fast-android-r caches all classes and values that are queried. The first query usually takes <5ms. Subsequent queries to the same value will take negligible time (O(1) lookup). First time queries to other fields/classes usually take <2ms.

console.log(androidR.integer.config_longAnimTime); // 0-4ms
console.log(androidR.integer.config_longAnimTime); // ~0ms
console.log(androidR.integer.config_shortAnimTime); // 0-2ms
console.log(androidR.integer.config_shortAnimTime); // ~0ms
console.log(androidR.transition.explode); // 0-4ms
console.log(androidR.transition.explode); // ~0ms

Future possibilities

WAlthough some values from the R class are dynamic (e.g.: resources, strings, etc), most of them are not (integer.config_longAnimTime, integer.config_longAnimTime and others defined in the documentation). It may be benefitial to preload immutable values into the cache while allowing "dynamic" values to be queried.

License

Apache License Version 2.0, January 2004