Handle WebView unavailability

app/src/main/java/org/koitharu/kotatsu/browser/BrowserActivity.kt

@@ -15,6 +15,7 @@ import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.base.ui.BaseActivity
 import org.koitharu.kotatsu.core.network.CommonHeadersInterceptor
 import org.koitharu.kotatsu.databinding.ActivityBrowserBinding
+import org.koitharu.kotatsu.utils.ext.catchingWebViewUnavailability
 import com.google.android.material.R as materialR
 
 @SuppressLint("SetJavaScriptEnabled")
@@ -24,7 +25,9 @@ class BrowserActivity : BaseActivity<ActivityBrowserBinding>(), BrowserCallback
 
 	override fun onCreate(savedInstanceState: Bundle?) {
 		super.onCreate(savedInstanceState)
-		setContentView(ActivityBrowserBinding.inflate(layoutInflater))
+		if (!catchingWebViewUnavailability { setContentView(ActivityBrowserBinding.inflate(layoutInflater)) }) {
+			return
+		}
 		supportActionBar?.run {
 			setDisplayHomeAsUpEnabled(true)
 			setHomeAsUpIndicator(materialR.drawable.abc_ic_clear_material)

app/src/main/java/org/koitharu/kotatsu/settings/sources/auth/SourceAuthActivity.kt

@@ -25,6 +25,7 @@ import org.koitharu.kotatsu.databinding.ActivityBrowserBinding
 import org.koitharu.kotatsu.parsers.MangaParserAuthProvider
 import org.koitharu.kotatsu.parsers.model.MangaSource
 import org.koitharu.kotatsu.utils.TaggedActivityResult
+import org.koitharu.kotatsu.utils.ext.catchingWebViewUnavailability
 import org.koitharu.kotatsu.utils.ext.getSerializableExtraCompat
 import javax.inject.Inject
 import com.google.android.material.R as materialR
@@ -41,7 +42,9 @@ class SourceAuthActivity : BaseActivity<ActivityBrowserBinding>(), BrowserCallba
 	@SuppressLint("SetJavaScriptEnabled")
 	override fun onCreate(savedInstanceState: Bundle?) {
 		super.onCreate(savedInstanceState)
-		setContentView(ActivityBrowserBinding.inflate(layoutInflater))
+		if (!catchingWebViewUnavailability { setContentView(ActivityBrowserBinding.inflate(layoutInflater)) }) {
+			return
+		}
 		val source = intent?.getSerializableExtraCompat(EXTRA_SOURCE) as? MangaSource
 		if (source == null) {
 			finishAfterTransition()

app/src/main/java/org/koitharu/kotatsu/utils/ext/AndroidExt.kt

@@ -19,6 +19,7 @@ import android.provider.Settings
 import android.view.View
 import android.view.ViewPropertyAnimator
 import android.view.Window
+import android.widget.Toast
 import androidx.activity.result.ActivityResultLauncher
 import androidx.annotation.IntegerRes
 import androidx.core.app.ActivityOptionsCompat
@@ -170,3 +171,18 @@ fun Context.findActivity(): Activity? = when (this) {
 	is ContextWrapper -> baseContext.findActivity()
 	else -> null
 }
+
+inline fun Activity.catchingWebViewUnavailability(block: () -> Unit): Boolean {
+	return try {
+		block()
+		true
+	} catch (e: Exception) {
+		if (e.isWebViewUnavailable()) {
+			Toast.makeText(this, R.string.web_view_unavailable, Toast.LENGTH_LONG).show()
+			finishAfterTransition()
+			false
+		} else {
+			throw e
+		}
+	}
+}

app/src/main/java/org/koitharu/kotatsu/utils/ext/ThrowableExt.kt

@@ -2,6 +2,7 @@ package org.koitharu.kotatsu.utils.ext
 
 import android.content.ActivityNotFoundException
 import android.content.res.Resources
+import android.util.AndroidRuntimeException
 import androidx.collection.arraySetOf
 import kotlinx.coroutines.CancellationException
 import okio.FileNotFoundException
@@ -94,3 +95,8 @@ inline fun <R> runCatchingCancellable(block: () -> R): Result<R> {
 		Result.failure(e)
 	}
 }
+
+fun Throwable.isWebViewUnavailable(): Boolean {
+	return (this is AndroidRuntimeException && message?.contains("WebView") == true) ||
+		cause?.isWebViewUnavailable() == true
+}

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

@@ -415,4 +415,5 @@
 	<string name="downloads_cancelled">Downloads have been cancelled</string>
 	<string name="suggestions_enable_prompt">Do you want to receive personalized manga suggestions?</string>
 	<string name="translations">Translations</string>
+	<string name="web_view_unavailable">WebView not available: check if WebView provider is installed</string>
 </resources>