kotlin webview example

  

kotlin webview example

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Kotlin features highly simplify Android development not only by allowing you to have smaller structures of text, but maintaining semantically good functions in the app. That would allow you to think less about implementation information and more about the entire app system. Practical role of Kotlin can reduce side effects of the code and make it easier to check and see.

1.WebActivity.kt:

import android.annotation.SuppressLint

import android.content.Context

import android.content.Intent

import android.net.http.SslError

import android.os.Bundle

import android.view.KeyEvent

import android.webkit.SslErrorHandler

import android.webkit.WebChromeClient

import android.webkit.WebView

import android.webkit.WebViewClient

import android.widget.ProgressBar

import androidx.appcompat.app.AppCompatActivity

import kotlinx.android.synthetic.main.activity_web.*

class WebActivity : AppCompatActivity() {

    companion object {

        const val PAGE_URL = "pageUrl"

        const val MAX_PROGRESS = 100

        fun newIntent(context: Context, pageUrl: String): Intent {

            val intent = Intent(context, WebActivity::class.java)

            intent.putExtra(PAGE_URL, pageUrl)

            return intent

        }

    }

    private lateinit var pageUrl: String

    override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)

        setContentView(R.layout.activity_web)

        // get pageUrl from String

        pageUrl = intent.getStringExtra(PAGE_URL)

            ?: throw IllegalStateException("field $PAGE_URL missing in Intent")

        initWebView()

        setWebClient()

        handlePullToRefresh()

        loadUrl(pageUrl)

    }

    private fun handlePullToRefresh() {

    }

    @SuppressLint("SetJavaScriptEnabled")

    private fun initWebView() {

        webView.settings.javaScriptEnabled = true

        webView.settings.loadWithOverviewMode = true

        webView.settings.useWideViewPort = true

        webView.settings.domStorageEnabled = true

        webView.webViewClient = object : WebViewClient() {

            override

            fun onReceivedSslError(view: WebView?, handler: SslErrorHandler?, error: SslError?) {

                handler?.proceed()

            }

        }

    }

    private fun setWebClient() {

        webView.webChromeClient = object : WebChromeClient() {

            override fun onProgressChanged(

                view: WebView,

                newProgress: Int

            ) {

                super.onProgressChanged(view, newProgress)

                progressBar.progress = newProgress

                if (newProgress < MAX_PROGRESS && progressBar.visibility == ProgressBar.GONE) {

                    progressBar.visibility = ProgressBar.VISIBLE

                }

                if (newProgress == MAX_PROGRESS) {

                    progressBar.visibility = ProgressBar.GONE

                }

            }

        }

    }

    override fun onKeyDown(keyCode: Int, event: KeyEvent?): Boolean {

        // Check if the key event was the Back button and if there's history

        if (keyCode == KeyEvent.KEYCODE_BACK && webView.canGoBack()) {

            webView.goBack()

            return true

        }

        // If it wasn't the Back key or there's no web page history, exit the activity)

        return super.onKeyDown(keyCode, event)

    }

    private fun loadUrl(pageUrl: String) {

        webView.loadUrl(pageUrl)

    }

}

2.activity_web.xml:

<?xml version="1.0" encoding="utf-8"?>

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:app="http://schemas.android.com/apk/res-auto"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    tools:context=".MainActivity">

    <ProgressBar

        android:id="@+id/progressBar"

        style="?android:attr/progressBarStyleHorizontal"

        android:layout_width="0dp"

        android:layout_height="wrap_content"

        android:layout_margin="0dp"

        android:minHeight="4dp"

        android:padding="0dp"

        app:layout_constraintEnd_toEndOf="parent"

        app:layout_constraintStart_toStartOf="parent"

        app:layout_constraintTop_toTopOf="parent" />

    <WebView

        android:id="@+id/webView"

        android:layout_width="0dp"

        android:layout_height="0dp"

        app:layout_constraintBottom_toBottomOf="parent"

        app:layout_constraintEnd_toEndOf="parent"

        app:layout_constraintStart_toStartOf="parent"

        app:layout_constraintTop_toBottomOf="@+id/progressBar" />

</androidx.constraintlayout.widget.ConstraintLayout>