feat: Add link helper to open App Store for Nextcloud apps

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

Author: AndyScherzinger

core/src/main/java/com/nextcloud/android/common/core/utils/ecosystem/LinkHelper.kt

@@ -0,0 +1,43 @@
+/*
+ * Nextcloud Android Common Library
+ *
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: MIT
+ */
+
+package com.nextcloud.android.common.core.utils.ecosystem
+
+import android.content.ActivityNotFoundException
+import android.content.Context
+import android.content.Intent
+import androidx.core.net.toUri
+
+/**
+ * Helper class for opening Nextcloud apps if present
+ * or falling back to opening the app store
+ * in case the app is not yet installed on the device.
+ */
+object LinkHelper {
+
+    /**
+     * Open app store page of specified app or search for specified string. Will attempt to open browser when no app
+     * store is available.
+     *
+     * @param string packageName or url-encoded search string
+     * @param search false -> show app corresponding to packageName; true -> open search for string
+     */
+    fun openAppStore(string: String, search: Boolean = false, context: Context) {
+        var suffix = (if (search) "search?q=" else "details?id=") + string
+        val intent = Intent(Intent.ACTION_VIEW, "market://$suffix".toUri())
+        try {
+            context.startActivity(intent)
+        } catch (_: ActivityNotFoundException) {
+            // all is lost: open Google play store web page for app
+            if (!search) {
+                suffix = "apps/$suffix"
+            }
+            intent.setData("https://play.google.com/store/$suffix".toUri())
+            context.startActivity(intent)
+        }
+    }
+}