Koji integration in Android

WebviewActivity.kt

package chat.rocket.android.webview.ui

import android.annotation.SuppressLint
import android.content.Context
import android.content.Intent
import android.os.Bundle
import android.util.Log
import android.webkit.JavascriptInterface
import android.webkit.ValueCallback
import android.webkit.WebChromeClient
import androidx.appcompat.app.AppCompatActivity
import android.webkit.WebView
import android.webkit.WebViewClient
import android.widget.Toast
import chat.rocket.android.R
import kotlinx.android.synthetic.main.activity_web_view.*
import kotlinx.android.synthetic.main.app_bar.*
import org.json.JSONObject

fun Context.webViewIntent(webPageUrl: String, toolbarTitle: String? = null): Intent {
    return Intent(this, WebViewActivity::class.java).apply {
        putExtra(INTENT_WEB_PAGE_URL, webPageUrl)
        putExtra(TOOLBAR_TITLE, toolbarTitle)
    }
}

private const val INTENT_WEB_PAGE_URL = "web_page_url"
private const val TOOLBAR_TITLE = "toolbar_title"

// Simple WebView to load URL.
class WebViewActivity : AppCompatActivity() {
    private lateinit var webPageUrl: String
    private var toolbarTitle: String? = ""
    private val listenerScript: String
        get() = """(function(){window.addEventListener('message',function(event) {  MyJSInterface.handleMyEvent(JSON.stringify(event.data));});},false)();"""

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_web_view)

        webPageUrl = intent.getStringExtra(INTENT_WEB_PAGE_URL)
        requireNotNull(webPageUrl) { "no web_page_url provided in Intent extras" }
        toolbarTitle = intent.getStringExtra(TOOLBAR_TITLE)

        setupToolbar()
    }

    override fun onResume() {
        super.onResume()
        setupWebView()
    }

    override fun onBackPressed() {
        if (web_view.canGoBack()) {
            web_view.goBack()
        } else {
            finishActivity()
        }
    }

    private fun setupToolbar() {
        toolbar.title = if(toolbarTitle != null) toolbarTitle else webPageUrl.replace("https://","")
        toolbar.setNavigationIcon(R.drawable.ic_close_white_24dp)
        toolbar.setNavigationOnClickListener {
            finishActivity()
        }
    }

    @SuppressLint("SetJavaScriptEnabled")
    private fun setupWebView() {
        web_view.settings.javaScriptEnabled = true
        web_view.settings.domStorageEnabled = true
        web_view.settings.loadWithOverviewMode = true
        web_view.settings.useWideViewPort = true
        web_view.webChromeClient = WebChromeClient()
        web_view.addJavascriptInterface(WebAppInterface(), "MyJSInterface")

        web_view.webViewClient = object : WebViewClient() {
            override fun onPageFinished(view: WebView?, url: String?) {
                super.onPageFinished(view, url)
                view?.evaluateJavascript(listenerScript, ValueCallback {
                    Log.d("mess", "it")
                })
                view_loading.hide()
            }
        }
        web_view.loadUrl(webPageUrl)
    }

    private fun finishActivity() {
        super.onBackPressed()
        overridePendingTransition(R.anim.hold, R.anim.slide_down)
    }

    class WebAppInterface {
        @JavascriptInterface
        fun handleMyEvent(jsonString: String) {
//            val data: JSONObject = JSONObject(jsonString)
            Log.d("mess", jsonString)
        }
    }