Compose WebView Part 10 | Show Loader

How do i display Loader while loading url - Jetpack compose

In this jetpack compose tutorial series we will cover how to display loader screen while loading the webpage inside webview with jetpack compose. To handle the webpage loading status we will use WebViewClient class.

Ref this : to show animating loader while loading the web page in our app: https://www.boltuix.com/2022/07/compose-custom-animating-dialog.html

package com.blogspot.boltuix

import android.annotation.SuppressLint
import android.graphics.Bitmap
import android.os.Bundle
import android.view.ViewGroup
import android.webkit.WebView
import android.webkit.WebViewClient
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.Image
import androidx.compose.foundation.layout.*
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Surface
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.ui.Alignment
import androidx.compose.ui.ExperimentalComposeUiApi
import androidx.compose.ui.Modifier
import androidx.compose.ui.layout.ContentScale
import androidx.compose.ui.res.painterResource
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import androidx.compose.ui.viewinterop.AndroidView
import androidx.compose.ui.window.Dialog
import androidx.compose.ui.window.DialogProperties


class MainActivity : ComponentActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            WebViewPage("https://www.boltuix.com/")
        }
    }
}




@OptIn(ExperimentalComposeUiApi::class)
@SuppressLint("SetJavaScriptEnabled")
@Composable
fun WebViewPage(url: String){

    //..........................................................................custom full screen dialog
    val loaderDialogScreen = remember { mutableStateOf(false) }
    if (loaderDialogScreen.value) {

        // Dialog function
        Dialog(
            onDismissRequest = {
                loaderDialogScreen.value = false
            },
            properties = DialogProperties(
                usePlatformDefaultWidth = false // experimental
            )
        ) {
            Surface(modifier = Modifier.fillMaxSize()) {

                Column(
                    modifier = Modifier.fillMaxSize(),
                    verticalArrangement = Arrangement.Center,
                    horizontalAlignment = Alignment.CenterHorizontally
                ) {



                    Image(
                        painter = painterResource(id = R.drawable.logo),
                        contentDescription = null,
                        contentScale = ContentScale.Fit,
                        modifier = Modifier
                            .height(200.dp)
                            .fillMaxWidth(),

                        )

                    Spacer(modifier = Modifier.height(20.dp))
                    //.........................Text: title
                    Text(
                        text = "Loading...",
                        textAlign = TextAlign.Center,
                        modifier = Modifier
                            .padding(top = 20.dp)
                            .fillMaxWidth(),
                        letterSpacing = 2.sp,
                        fontWeight = FontWeight.Bold,
                        style = MaterialTheme.typography.titleLarge,
                        color = MaterialTheme.colorScheme.primary,
                    )
                    Spacer(modifier = Modifier.height(8.dp))

                    //.........................Text : description
                    Text(
                        text = "Please wait",
                        textAlign = TextAlign.Center,
                        modifier = Modifier
                            .padding(top = 10.dp, start = 25.dp, end = 25.dp)
                            .fillMaxWidth(),
                        letterSpacing = 3.sp,
                        style = MaterialTheme.typography.bodyLarge,
                        color = MaterialTheme.colorScheme.primary,
                    )
                    //.........................Spacer
                    Spacer(modifier = Modifier.height(24.dp))

                }

            }
        }

    }


    //..........................................................................
    AndroidView(
        factory = {
            WebView(it).apply {
                layoutParams = ViewGroup.LayoutParams(
                    ViewGroup.LayoutParams.MATCH_PARENT,
                    ViewGroup.LayoutParams.MATCH_PARENT
                )
                webViewClient = WebViewClient()

                // to play video on a web view
                settings.javaScriptEnabled = true

                webViewClient = object : WebViewClient() {

                    override fun onPageStarted(view: WebView?, url: String?, favicon: Bitmap?) {
                        super.onPageStarted(view, url, favicon)
                        // show dialog
                        loaderDialogScreen.value = true
                    }

                    override fun onPageFinished(view: WebView?, url: String?) {
                        super.onPageFinished(view, url)
                        // hide dialog
                        loaderDialogScreen.value = false
                    }
                }

                loadUrl(url)
            }
        }, update = {
            it.loadUrl(url)
        })
}

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GET source code on Github:

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