QuickJS For Android

QuickJS wrapper for Android.

中文说明

Feature

• Java types are supported with JavaScript
• Support promise execute
• console.log implement
• JavaScript exception handler
• Optimize not a function with its name when type error

Experimental Features Stability not guaranteed.

• Compile bytecode
• ESModule (import, export)

Download

repositories {
  mavenCentral()
}
        
dependencies {
  implementation 'wang.harlon.quickjs:wrapper:latest.version'
}

See here for the latest version

Usage

Create QuickJSContext

QuickJSContext context = QuickJSContext.create();

Evaluating JavaScript

QuickJSContext context = QuickJSContext.create();
context.evaluate("var a = 1 + 2;");

Supported Java Types

Currently, the following Java types are supported with JavaScript:

• boolean
• int when calling JavaScript from Java.
• double
• String
• null
• JSObject represents a JavaScript object
• JSFunction represents a JavaScript function
• JSArray represents a JavaScript Array

Set Property

Java

JSObject globalObj = context.getGlobalObject();
JSObject obj1 = context.createNewJSObject();
obj1.setProperty("stringProperty", "hello");
obj1.setProperty("intProperty", 1);
obj1.setProperty("doubleProperty", 0.1);
obj1.setProperty("booleanProperty", true);
obj1.setProperty("functionProperty", (JSCallFunction) args -> {
    return args[0] + "Wang";
});
globalObj.setProperty("obj1", obj1);

JavaScript

obj1.stringProperty; // hello string
obj1.intProperty; // 1
obj1.doubleProperty; // 0.1
obj1.booleanProperty; // true
obj1.functionProperty('Harlon'); // HarlonWang

Get Property

JavaScript

var obj1 = {
	stringProperty: 'hello string',
	intProperety: 1,
	doubleProperty: 0.1,
	booleanProperty: true,
	functionProperty: (name) => { return name + 'Wang'; }
}

Java

JSObject globalObject = context.getGlobalObject();
JSObject obj1 = globalObject.getJSObjectProperty("obj1");
obj1.getProperty("stringProperty"); // hello
obj1.getProperty("intProperty"); // 1
obj1.getProperty("doubleProperty"); // 0.1
obj1.getProperty("booleanProperty"); // true
obj1.getJSFunctionProperty("functionProperty").call("Harlon"); // HarlonWang

Compile ByteCode

byte[] code = context.compile("'hello, world!'.toUpperCase();");
context.execute(code);

ESModule

Java

JSModule.setModuleLoader(new JSModule.Loader() {
    @Override
    public String getModuleScript(String moduleName) {
        return "export var name = 'Hello world';\n" +
                "export var age = 18;";
    }
});

JavaScript

import {name, age} from './a.js';

console.log('name：' + name); // Jack
console.log('age：' + age); // 18

Concurrency

JavaScript runtimes are single threaded. All execution in the JavaScript runtime is guaranteed thread safe, by way of Java synchronization.

Reference

• quickjs-java
• quack
• quickjs-android