Add invisible FragmentHostActivity to support custom HTML in-app messages on NativeActivity

clevertap-core/src/main/AndroidManifest.xml

@@ -15,6 +15,13 @@
             android:configChanges="keyboardHidden"
             android:theme="@style/Theme.AppCompat.DayNight.DarkActionBar" />
 
+        <activity
+            android:name="com.clevertap.android.sdk.FragmentHostActivity"
+            android:theme="@style/CleverTapFragmentHostTheme"
+            android:noHistory="true"
+            android:launchMode="singleTop"
+            android:exported="false" />
+
         <receiver
             android:name=".pushnotification.CTPushNotificationReceiver"
             android:enabled="true"

clevertap-core/src/main/java/com/clevertap/android/sdk/FragmentHostActivity.java

@@ -0,0 +1,58 @@
+package com.clevertap.android.sdk;
+
+import android.app.Activity;
+import android.content.Context;
+import android.content.Intent;
+import android.os.Bundle;
+import androidx.annotation.NonNull;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentActivity;
+import androidx.fragment.app.FragmentManager;
+
+public class FragmentHostActivity extends AppCompatActivity {
+
+    private static boolean hosting = false;
+    public static boolean isHosting() { return hosting; }
+
+    public static void launch(Activity current) {
+        Intent intent = new Intent(current, FragmentHostActivity.class);
+        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+        current.startActivity(intent);
+
+        // try to supress any transitions
+        current.overridePendingTransition(0, 0);
+    }
+
+    @Override protected void onCreate(Bundle b) {
+        super.onCreate(b);
+        hosting = true;
+
+        // try to supress any transitions
+        overridePendingTransition(0, 0); 
+    }
+
+    @Override protected void onResume() {
+        super.onResume();
+
+        // try to supress any transitions
+        getSupportFragmentManager()
+            .registerFragmentLifecycleCallbacks(new FragmentManager.FragmentLifecycleCallbacks() {
+                @Override
+                public void onFragmentPreAttached(@NonNull FragmentManager fm, @NonNull Fragment f, @NonNull Context context) {
+                    f.setEnterTransition(null);
+                    f.setExitTransition(null);
+                    f.setReenterTransition(null);
+                    f.setReturnTransition(null);
+                }
+            }, true);
+    }
+
+    @Override protected void onDestroy() {
+        super.onDestroy();
+        hosting = false;
+
+        // try to supress any transitions
+        overridePendingTransition(0, 0);
+    }
+}

clevertap-core/src/main/java/com/clevertap/android/sdk/inapp/InAppController.java

@@ -24,6 +24,7 @@
 import com.clevertap.android.sdk.ControllerManager;
 import com.clevertap.android.sdk.CoreMetaData;
 import com.clevertap.android.sdk.DeviceInfo;
+import com.clevertap.android.sdk.FragmentHostActivity;
 import com.clevertap.android.sdk.InAppNotificationActivity;
 import com.clevertap.android.sdk.InAppNotificationListener;
 import com.clevertap.android.sdk.Logger;
@@ -792,6 +793,27 @@ private void showInApp(
             return;
         }
 
+        // if this inAppNotification requires a FragmentActivity and the current
+        // activity isn't one,
+        // - insert this notification at the head of the pendingNotifications queue,
+        // - launch the FragmentHostActivity,
+        // - when the fragment activity has launched it'll trigger checking
+        // pendingNotifications again and we can safely render
+        if (requiresFragmentHost(inAppNotification.getInAppType())) {
+            Activity act = CoreMetaData.getCurrentActivity();
+            if (!(act instanceof FragmentActivity)) {
+                Logger.d(config.getAccountId(),
+                        "Current activity is not a FragmentActivity — deferring in-app & launching FragmentHostActivity");
+                if (!pendingNotifications.contains(inAppNotification)) {
+                    pendingNotifications.addFirst(inAppNotification);
+                }
+                if (!FragmentHostActivity.isHosting()) {
+                    FragmentHostActivity.launch(act);
+                }
+                return;
+            }
+        }
+
         currentlyDisplayingInApp = inAppNotification;
 
         CTInAppBaseFragment inAppFragment = null;
@@ -872,6 +894,19 @@ private void showInApp(
         }
     }
 
+    private static boolean requiresFragmentHost(CTInAppType type) {
+        switch (type) {
+            case CTInAppTypeFooterHTML:
+            case CTInAppTypeHeaderHTML:
+            case CTInAppTypeFooter:
+            case CTInAppTypeHeader:
+                return true;
+
+            default:
+                return false;
+        }
+    }
+
     @WorkerThread
     public void onQueueEvent(final String eventName, Map<String, Object> eventProperties, Location userLocation) {
         final Map<String, Object> appFieldsWithEventProperties = JsonUtil.mapFromJson(

clevertap-core/src/main/res/values/styles.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <style name="CleverTapFragmentHostTheme" parent="Theme.AppCompat.Light.NoActionBar">
+        <item name="android:windowIsTranslucent">true</item>
+        <item name="android:windowBackground">@android:color/transparent</item>
+        <item name="android:windowNoTitle">true</item>
+        <item name="android:windowFullscreen">true</item>
+    </style>
+</resources>