Route popup window navigation to main WebView internally

Author: sakusaku3939

app/src/main/java/com/example/deeplviewer/activity/MainActivity.kt

@@ -16,6 +16,8 @@ import com.example.deeplviewer.R
 import com.example.deeplviewer.config.WebViewConfig
 import com.example.deeplviewer.helper.CookieManagerHelper
 import com.example.deeplviewer.helper.UrlHelper
+import com.example.deeplviewer.webview.MyWebChromeClient
+import com.example.deeplviewer.webview.MyWebChromeClient.Companion.DEEPL_INTERNAL_REGEX
 import com.example.deeplviewer.webview.MyWebViewClient
 import com.example.deeplviewer.webview.WebAppInterface
 
@@ -118,6 +120,7 @@ class MainActivity : AppCompatActivity() {
     private fun setupWebViewClient() {
         webViewClient = MyWebViewClient(this)
         webView.webViewClient = webViewClient
+        webView.webChromeClient = MyWebChromeClient(webView)
     }
 
     /**
@@ -173,9 +176,7 @@ class MainActivity : AppCompatActivity() {
         val webView: WebView = findViewById(R.id.webview)
         val url = webView.url ?: ""
 
-        // Extract the page type 'translator' or 'write' from the URL
-        val pageTypeRegex = Regex("^https://www\\.deepl\\.com/.*/(translator|write).*$")
-        val pageTypeMatch = pageTypeRegex.find(url)
+        val pageTypeMatch = DEEPL_INTERNAL_REGEX.find(url)
         val pageType = pageTypeMatch?.groupValues?.get(1)
 
         pageType?.let {

app/src/main/java/com/example/deeplviewer/config/WebViewConfig.kt

@@ -10,6 +10,7 @@ object WebViewConfig {
         webView.settings.apply {
             javaScriptEnabled = true
             domStorageEnabled = true
+            setSupportMultipleWindows(true)
 
             // cache settings
             cacheMode = WebSettings.LOAD_DEFAULT

app/src/main/java/com/example/deeplviewer/webview/MyWebChromeClient.kt

@@ -0,0 +1,51 @@
+package com.example.deeplviewer.webview
+
+import android.graphics.Bitmap
+import android.os.Message
+import android.webkit.WebChromeClient
+import android.webkit.WebResourceRequest
+import android.webkit.WebView
+import android.webkit.WebViewClient
+
+class MyWebChromeClient(
+    private val mainWebView: WebView,
+) : WebChromeClient() {
+    override fun onCreateWindow(
+        view: WebView,
+        isDialog: Boolean,
+        isUserGesture: Boolean,
+        resultMsg: Message
+    ): Boolean {
+        val tempWebView = WebView(view.context)
+        tempWebView.webViewClient = object : WebViewClient() {
+            private var handled = false
+
+            private fun handleUrl(url: String) {
+                if (handled || url.isEmpty() || url == "about:blank") return
+                handled = true
+                mainWebView.loadUrl(url)
+                mainWebView.post { tempWebView.destroy() }
+            }
+
+            override fun shouldOverrideUrlLoading(
+                view: WebView,
+                request: WebResourceRequest
+            ): Boolean {
+                handleUrl(request.url.toString())
+                return true
+            }
+
+            override fun onPageStarted(view: WebView, url: String, favicon: Bitmap?) {
+                handleUrl(url)
+            }
+        }
+        val transport = resultMsg.obj as WebView.WebViewTransport
+        transport.webView = tempWebView
+        resultMsg.sendToTarget()
+        return true
+    }
+
+    companion object {
+        val DEEPL_INTERNAL_REGEX = Regex("^https://www\\.deepl\\.com/.*/(translator|write).*$")
+    }
+}

app/src/main/java/com/example/deeplviewer/webview/MyWebViewClient.kt

@@ -20,6 +20,7 @@ import androidx.webkit.WebViewFeature
 import com.example.deeplviewer.R
 import com.example.deeplviewer.activity.MainActivity
 import androidx.core.content.edit
+import com.example.deeplviewer.webview.MyWebChromeClient.Companion.DEEPL_INTERNAL_REGEX
 
 class MyWebViewClient(
     private val activity: Activity,
@@ -31,10 +32,7 @@ class MyWebViewClient(
 
     override fun shouldOverrideUrlLoading(view: WebView?, request: WebResourceRequest?): Boolean {
         val url = request?.url.toString()
-        val regex = Regex("^https://www\\.deepl\\.com/.*/(translator|write).*$")
-        val isDeepLTranslatorUrl = regex.matches(url)
-
-        return !isDeepLTranslatorUrl
+        return !DEEPL_INTERNAL_REGEX.matches(url)
     }
 
     override fun onPageStarted(view: WebView, url: String, favicon: Bitmap?) {