implement img extraction using js evaluating on webview

app/src/main/java/com/mykola2312/outagefetch/MainActivity.kt

@@ -1,7 +1,10 @@
 package com.mykola2312.outagefetch
 
+import android.annotation.SuppressLint
 import android.os.Bundle
+import android.util.Log
 import android.view.ViewGroup
+import android.webkit.ValueCallback
 import android.webkit.WebResourceRequest
 import android.webkit.WebView
 import android.webkit.WebViewClient
@@ -14,6 +17,7 @@ import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.viewinterop.AndroidView
 import com.mykola2312.outagefetch.ui.theme.OutageFetchTheme
@@ -35,9 +39,10 @@ class MainActivity : ComponentActivity() {
     }
 }
 
+@SuppressLint("SetJavaScriptEnabled")
 @Composable
 fun ExtractWebView() {
-    val url = "https://2ip.ua"
+    val url = stringResource(id = R.string.fetch_url)
 
     AndroidView(factory = {
         WebView(it).apply {
@@ -45,17 +50,34 @@ fun ExtractWebView() {
                 ViewGroup.LayoutParams.MATCH_PARENT,
                 ViewGroup.LayoutParams.MATCH_PARENT
             )
+
             this.webViewClient = ExtractorClient()
         }
     }, update = {
+        it.settings.javaScriptEnabled = true
         it.loadUrl(url);
     })
 }
 
 class ExtractorClient : WebViewClient() {
+    companion object ExtractConstants {
+        const val JS_EXTRACT = "document.getElementsByClassName(\"aos-init aos-animate\").item(0).children[4].lastChild.src";
+    }
+
     override fun shouldOverrideUrlLoading(view: WebView?, request: WebResourceRequest?): Boolean {
         return false
     }
+
+    override fun onPageFinished(view: WebView?, url: String?) {
+        super.onPageFinished(view, url)
+
+        view?.evaluateJavascript(JS_EXTRACT, ValueCallback<String> {
+            if (it != null) {
+                val scheduleImgUrl = it.removeSurrounding("\"")
+                Log.i("extract", scheduleImgUrl)
+            }
+        })
+    }
 }
 
 @Composable

app/src/main/res/values/strings.xml

@@ -1,3 +1,4 @@
 <resources>
     <string name="app_name">OutageFetch</string>
+    <string name="fetch_url">https://poweron.loe.lviv.ua/</string>
 </resources>