Revert usage of AndroidX Webkit library (closes #2611)

app/build.gradle

@@ -116,7 +116,6 @@ dependencies {
     implementation 'androidx.annotation:annotation:1.1.0'
     implementation 'androidx.browser:browser:1.2.0'
     implementation 'androidx.multidex:multidex:2.0.1'
-    implementation 'androidx.webkit:webkit:1.1.0'
 
     // UI library
     implementation 'com.google.android.material:material:1.1.0'

app/src/main/java/eu/kanade/tachiyomi/network/CloudflareInterceptor.kt

@@ -2,17 +2,14 @@ package eu.kanade.tachiyomi.network
 
 import android.annotation.SuppressLint
 import android.content.Context
+import android.os.Build
 import android.os.Handler
 import android.os.Looper
-import android.webkit.WebResourceRequest
-import android.webkit.WebResourceResponse
 import android.webkit.WebSettings
 import android.webkit.WebView
 import android.widget.Toast
-import androidx.webkit.WebResourceErrorCompat
-import androidx.webkit.WebViewClientCompat
-import androidx.webkit.WebViewFeature
 import eu.kanade.tachiyomi.R
+import eu.kanade.tachiyomi.util.system.WebViewClientCompat
 import eu.kanade.tachiyomi.util.system.isOutdated
 import eu.kanade.tachiyomi.util.system.toast
 import okhttp3.Cookie
@@ -102,39 +99,24 @@ class CloudflareInterceptor(private val context: Context) : Interceptor {
                     }
 
                     // HTTP error codes are only received since M
-                    if (WebViewFeature.isFeatureSupported(WebViewFeature.RECEIVE_WEB_RESOURCE_ERROR) &&
-                            url == origRequestUrl && !challengeFound
+                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M &&
+                        url == origRequestUrl && !challengeFound
                     ) {
                         // The first request didn't return the challenge, abort.
                         latch.countDown()
                     }
                 }
 
-                override fun onReceivedHttpError(
+                override fun onReceivedErrorCompat(
                         view: WebView,
-                        request: WebResourceRequest,
-                        errorResponse: WebResourceResponse
+                        errorCode: Int,
+                        description: String?,
+                        failingUrl: String,
+                        isMainFrame: Boolean
                 ) {
-                    if (request.isForMainFrame) {
-                        if (errorResponse.statusCode == 503) {
-                            // Found the Cloudflare challenge page.
-                            challengeFound = true
-                        } else {
-                            // Unlock thread, the challenge wasn't found.
-                            latch.countDown()
-                        }
-                    }
-                }
-
-                @SuppressLint("RequiresFeature")
-                override fun onReceivedError(
-                        view: WebView,
-                        request: WebResourceRequest,
-                        error: WebResourceErrorCompat
-                ) {
-                    if (request.isForMainFrame) {
-                        if (error.errorCode == 503) {
-                            // Found the Cloudflare challenge page.
+                    if (isMainFrame) {
+                        if (errorCode == 503) {
+                            // Found the cloudflare challenge page.
                             challengeFound = true
                         } else {
                             // Unlock thread, the challenge wasn't found.

app/src/main/java/eu/kanade/tachiyomi/ui/webview/WebViewActivity.kt

@@ -9,14 +9,13 @@ import android.os.Bundle
 import android.view.Menu
 import android.view.MenuItem
 import android.webkit.WebChromeClient
-import android.webkit.WebResourceRequest
 import android.webkit.WebView
 import androidx.core.graphics.ColorUtils
-import androidx.webkit.WebViewClientCompat
 import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.source.SourceManager
 import eu.kanade.tachiyomi.source.online.HttpSource
 import eu.kanade.tachiyomi.ui.base.activity.BaseActivity
+import eu.kanade.tachiyomi.util.system.WebViewClientCompat
 import eu.kanade.tachiyomi.util.system.getResourceColor
 import eu.kanade.tachiyomi.util.system.openInBrowser
 import eu.kanade.tachiyomi.util.system.toast
@@ -75,8 +74,8 @@ class WebViewActivity : BaseActivity() {
             }
 
             webview.webViewClient = object : WebViewClientCompat() {
-                override fun shouldOverrideUrlLoading(view: WebView, request: WebResourceRequest): Boolean {
-                    view.loadUrl(request.url.toString())
+                override fun shouldOverrideUrlCompat(view: WebView, url: String): Boolean {
+                    view.loadUrl(url)
                     return true
                 }
 
@@ -94,7 +93,7 @@ class WebViewActivity : BaseActivity() {
                     invalidateOptionsMenu()
                 }
 
-                override fun onPageCommitVisible(view: WebView, url: String) {
+                override fun onPageCommitVisible(view: WebView?, url: String?) {
                     super.onPageCommitVisible(view, url)
 
                     // Reset to top when page refreshes

app/src/main/java/eu/kanade/tachiyomi/util/system/WebViewClientCompat.kt

@@ -0,0 +1,82 @@
+package eu.kanade.tachiyomi.util.system
+
+import android.annotation.TargetApi
+import android.os.Build
+import android.webkit.*
+
+@Suppress("OverridingDeprecatedMember")
+abstract class WebViewClientCompat : WebViewClient() {
+
+    open fun shouldOverrideUrlCompat(view: WebView, url: String): Boolean {
+        return false
+    }
+
+    open fun shouldInterceptRequestCompat(view: WebView, url: String): WebResourceResponse? {
+        return null
+    }
+
+    open fun onReceivedErrorCompat(
+            view: WebView,
+            errorCode: Int,
+            description: String?,
+            failingUrl: String,
+            isMainFrame: Boolean) {
+
+    }
+
+    @TargetApi(Build.VERSION_CODES.N)
+    final override fun shouldOverrideUrlLoading(
+            view: WebView,
+            request: WebResourceRequest
+    ): Boolean {
+        return shouldOverrideUrlCompat(view, request.url.toString())
+    }
+
+    final override fun shouldOverrideUrlLoading(view: WebView, url: String): Boolean {
+        return shouldOverrideUrlCompat(view, url)
+    }
+
+    final override fun shouldInterceptRequest(
+            view: WebView,
+            request: WebResourceRequest
+    ): WebResourceResponse? {
+        return shouldInterceptRequestCompat(view, request.url.toString())
+    }
+
+    final override fun shouldInterceptRequest(
+            view: WebView,
+            url: String
+    ): WebResourceResponse? {
+        return shouldInterceptRequestCompat(view, url)
+    }
+
+    @TargetApi(Build.VERSION_CODES.M)
+    final override fun onReceivedError(
+            view: WebView,
+            request: WebResourceRequest,
+            error: WebResourceError
+    ) {
+        onReceivedErrorCompat(view, error.errorCode, error.description?.toString(),
+                request.url.toString(), request.isForMainFrame)
+    }
+
+    final override fun onReceivedError(
+            view: WebView,
+            errorCode: Int,
+            description: String?,
+            failingUrl: String
+    ) {
+        onReceivedErrorCompat(view, errorCode, description, failingUrl, failingUrl == view.url)
+    }
+
+    @TargetApi(Build.VERSION_CODES.M)
+    final override fun onReceivedHttpError(
+            view: WebView,
+            request: WebResourceRequest,
+            error: WebResourceResponse
+    ) {
+        onReceivedErrorCompat(view, error.statusCode, error.reasonPhrase, request.url
+            .toString(), request.isForMainFrame)
+    }
+
+}