From 7504d9aa786877255256f05fa338b91507d9828a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Leonhard=20K=C3=BCnzler?= <leonhard@kuenzler.io>
Date: Sat, 9 Apr 2022 22:06:31 +0200
Subject: [PATCH] Use built-in tools for darkmode if supported

---
 app/build.gradle                              |  1 +
 .../whatsappwebtogo/WebviewActivity.java      | 28 ++++++++++++-------
 2 files changed, 19 insertions(+), 10 deletions(-)

diff --git a/app/build.gradle b/app/build.gradle
index 47adf62..ddafdbd 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -28,4 +28,5 @@ android {
 dependencies {
     implementation 'androidx.appcompat:appcompat:1.3.0'
     implementation 'com.google.android.material:material:1.3.0'
+    implementation 'androidx.webkit:webkit:1.4.0'
 }
diff --git a/app/src/main/java/io/kuenzler/whatsappwebtogo/WebviewActivity.java b/app/src/main/java/io/kuenzler/whatsappwebtogo/WebviewActivity.java
index 09923ed..e7dafd1 100644
--- a/app/src/main/java/io/kuenzler/whatsappwebtogo/WebviewActivity.java
+++ b/app/src/main/java/io/kuenzler/whatsappwebtogo/WebviewActivity.java
@@ -50,12 +50,15 @@
 import androidx.core.content.ContextCompat;
 import androidx.core.view.GravityCompat;
 import androidx.drawerlayout.widget.DrawerLayout;
+import androidx.webkit.WebSettingsCompat;
+import androidx.webkit.WebViewFeature;
 
 import com.google.android.material.navigation.NavigationView;
 import com.google.android.material.snackbar.Snackbar;
 
 import java.util.Arrays;
 import java.util.Locale;
+import java.util.Objects;
 
 public class WebviewActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
 
@@ -567,17 +570,22 @@ private void loadWhatsapp() {
     }
 
     public void addDarkMode(final WebView mWebView) {
-        if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
-            getWindow().setNavigationBarColor(Color.BLACK);
-            getWindow().setStatusBarColor(Color.BLACK);
-            try{ getSupportActionBar().setBackgroundDrawable(new ColorDrawable(Color.BLACK));
-            } catch (NullPointerException ignored) {}
-        }
+        getWindow().setNavigationBarColor(Color.BLACK);
+        getWindow().setStatusBarColor(Color.BLACK);
 
-        mWebView.loadUrl("javascript:(" +
-                "function(){ " +
-                "try {  document.body.classList.add('dark') } catch(err) { }" +
-                "})()");
+        Objects.requireNonNull(getSupportActionBar()).setBackgroundDrawable(new ColorDrawable(Color.BLACK));
+
+        if (WebViewFeature.isFeatureSupported(WebViewFeature.FORCE_DARK)) {
+            WebSettingsCompat.setForceDark(mWebView.getSettings(), WebSettingsCompat.FORCE_DARK_ON);
+            if (WebViewFeature.isFeatureSupported(WebViewFeature.FORCE_DARK_STRATEGY)) {
+                WebSettingsCompat.setForceDarkStrategy(mWebView.getSettings(), WebSettingsCompat.DARK_STRATEGY_PREFER_WEB_THEME_OVER_USER_AGENT_DARKENING);
+            }
+        } else {
+            mWebView.loadUrl("javascript:(" +
+                    "function(){ " +
+                    "try {  document.body.classList.add('dark') } catch(err) { }" +
+                    "})()");
+        }
     }
 
     public void setContentSize(final WebView mWebView){