EaseTheWorld

var AndroidPromise = {
    callbacks: {},
    requestId: 0,
    request: function (work, params={}) {
        return new Promise((resolve, reject) => {
            let requestId = this.requestId++
            this.callbacks[requestId] = {
                'resolve': resolve,
                'reject': reject
            }

pathnirvana

// Allows to call a Android java function asynchronously
// spawn long running computations/io on the Java/Android without blocking the JS/Website running inside the WebView
// Eg. const result = await callAndroidAsync('javaFunction', { param1: 'value1', param2: 'value2' })
// Please give a star if you find this useful

export async function callAndroidAsync(javaFuncName, params) {
	const rand = 'asyncJava_' + Math.floor(Math.random() * 1000000)
	window[rand] = {}
	
	// func called from android

timfreiheit

import android.os.Build;
import android.webkit.JavascriptInterface;
import android.webkit.WebView;

import com.google.gson.Gson;

import java.util.concurrent.Callable;
import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;