From f21ec109af9639f40690ec6865a42162cec7f3f4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?David=20Strau=C3=9F?= <mail@davidstrauss.at>
Date: Sun, 15 Dec 2024 20:42:22 +0100
Subject: [PATCH] feat(browser): add support check for custom tabs and fallback
 to default browser

---
 .../capacitorjs/plugins/browser/Browser.java  | 24 ++++++++++
 .../plugins/browser/BrowserPlugin.java        | 47 ++++++++++++-------
 2 files changed, 53 insertions(+), 18 deletions(-)

diff --git a/browser/android/src/main/java/com/capacitorjs/plugins/browser/Browser.java b/browser/android/src/main/java/com/capacitorjs/plugins/browser/Browser.java
index 060a4b956..02f910f04 100644
--- a/browser/android/src/main/java/com/capacitorjs/plugins/browser/Browser.java
+++ b/browser/android/src/main/java/com/capacitorjs/plugins/browser/Browser.java
@@ -5,12 +5,18 @@
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.content.pm.ResolveInfo;
 import android.net.Uri;
 import android.os.Bundle;
+
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.browser.customtabs.*;
 
+import java.util.ArrayList;
+import java.util.List;
+
 /**
  * The Browser class implements Custom Chrome Tabs. See
  * https://developer.chrome.com/multidevice/android/customtabs for background
@@ -81,6 +87,24 @@ public BrowserEventListener getBrowserEventListenerListener() {
         return browserEventListener;
     }
 
+    /**
+     * Check if custom tabs are supported.
+     * @return boolean
+     */
+    public boolean areCustomTabsSupported() {
+        PackageManager packageManager = context.getPackageManager();
+        Intent activityIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.example.com"));
+        List<ResolveInfo> resolveInfos = packageManager.queryIntentActivities(activityIntent, PackageManager.MATCH_ALL);
+
+        List<String> packageNames = new ArrayList<>();
+        for (ResolveInfo info : resolveInfos) {
+            packageNames.add(info.activityInfo.packageName);
+        }
+
+        String packageName = CustomTabsClient.getPackageName(context, packageNames, true);
+        return packageName != null;
+    }
+
     /**
      * Open the browser to the specified URL.
      * @param url
diff --git a/browser/android/src/main/java/com/capacitorjs/plugins/browser/BrowserPlugin.java b/browser/android/src/main/java/com/capacitorjs/plugins/browser/BrowserPlugin.java
index 1fbc16852..d2a08e35b 100644
--- a/browser/android/src/main/java/com/capacitorjs/plugins/browser/BrowserPlugin.java
+++ b/browser/android/src/main/java/com/capacitorjs/plugins/browser/BrowserPlugin.java
@@ -59,25 +59,36 @@ public void open(PluginCall call) {
             Logger.error(getLogTag(), "Invalid color provided for toolbarColor. Using default", null);
         }
 
-        // open the browser and finish
-        try {
-            Intent intent = new Intent(getContext(), BrowserControllerActivity.class);
-            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
-            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
-            getContext().startActivity(intent);
+        if (implementation.areCustomTabsSupported()) {
+            // open the browser and finish
+            try {
+                Intent intent = new Intent(getContext(), BrowserControllerActivity.class);
+                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
+                intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+                getContext().startActivity(intent);
 
-            Integer finalToolbarColor = toolbarColor;
-            setBrowserControllerListener(
-                activity -> {
-                    activity.open(implementation, url, finalToolbarColor);
-                    browserControllerActivityInstance = activity;
-                    call.resolve();
-                }
-            );
-        } catch (ActivityNotFoundException ex) {
-            Logger.error(getLogTag(), ex.getLocalizedMessage(), null);
-            call.reject("Unable to display URL");
-            return;
+                Integer finalToolbarColor = toolbarColor;
+                setBrowserControllerListener(
+                    activity -> {
+                        activity.open(implementation, url, finalToolbarColor);
+                        browserControllerActivityInstance = activity;
+                        call.resolve();
+                    }
+                );
+            } catch (ActivityNotFoundException ex) {
+                Logger.error(getLogTag(), ex.getLocalizedMessage(), null);
+                call.reject("Unable to display URL");
+            }
+        } else {
+            // fallback to opening the URL in the default browser
+            Intent browserIntent = new Intent(Intent.ACTION_VIEW, url);
+            browserIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+            if (browserIntent.resolveActivity(getContext().getPackageManager()) != null) {
+                getContext().startActivity(browserIntent);
+                call.resolve();
+            } else {
+                call.reject("No application can handle the URL");
+            }
         }
     }