activity embedding (android 12L)

vector-app/src/main/AndroidManifest.xml

@@ -18,6 +18,9 @@
         android:theme="@style/AppTheme.SC.Light"
         tools:ignore="UnusedAttribute"
         tools:replace="android:allowBackup">
+        <property
+            android:name="android.window.PROPERTY_ACTIVITY_EMBEDDING_SPLITS_ENABLED"
+            android:value="true" />
 
         <!-- Activity alias for the launcher Activity (must be declared after the Activity it targets) -->
         <!-- exported="true" is required to launch application -->
@@ -53,6 +56,9 @@
             <meta-data
                 android:name="androidx.emoji2.text.EmojiCompatInitializer"
                 tools:node="remove" />
+            <meta-data
+                android:name="im.vector.app.features.ui.SplitInitializer"
+                android:value="androidx.startup" />
         </provider>
 
         <provider

vector/build.gradle

@@ -199,6 +199,8 @@ dependencies {
     implementation libs.androidx.autoFill
     implementation 'jp.wasabeef:glide-transformations:4.3.0'
     implementation 'com.github.hyuwah:DraggableView:1.0.0'
+    implementation 'androidx.window:window:1.1.0-alpha04'
+    implementation 'androidx.startup:startup-runtime:1.1.1'
 
     // Custom Tab
     implementation 'androidx.browser:browser:1.4.0'

vector/src/main/AndroidManifest.xml

@@ -71,6 +71,10 @@
 
     <application android:supportsRtl="true">
 
+        <activity
+            android:name=".features.home.PlaceholderActivity"
+            android:exported="false" />
+
         <!-- Sentry auto-initialization disable -->
         <meta-data
             android:name="io.sentry.auto-init"

vector/src/main/java/im/vector/app/features/home/PlaceholderActivity.kt

@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2023 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.app.features.home
+
+import android.annotation.SuppressLint
+import android.graphics.Color
+import android.os.Bundle
+import androidx.core.view.WindowCompat
+import dagger.hilt.android.AndroidEntryPoint
+import im.vector.app.R
+import im.vector.app.core.platform.VectorBaseActivity
+import im.vector.app.databinding.ActivityPlaceholderBinding
+@AndroidEntryPoint
+class PlaceholderActivity :
+        VectorBaseActivity<ActivityPlaceholderBinding>(){
+    override fun getBinding() = ActivityPlaceholderBinding.inflate(layoutInflater)
+    @SuppressLint("ResourceAsColor")
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        WindowCompat.setDecorFitsSystemWindows(window, false)
+        window.statusBarColor = Color.TRANSPARENT
+        setContentView(R.layout.activity_placeholder)
+    }
+}

vector/src/main/java/im/vector/app/features/ui/SplitInitializer.kt

@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2023 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.app.features.ui
+
+import android.content.Context
+import androidx.startup.Initializer
+import androidx.window.embedding.SplitController
+import im.vector.app.R
+class SplitInitializer : Initializer<SplitController> {
+
+    override fun create(context: Context): SplitController {
+        SplitController.initialize(context, R.xml.split_configuration)
+        return SplitController.getInstance()
+    }
+
+    override fun dependencies(): List<Class<out Initializer<*>>> {
+        return emptyList()
+    }
+}

vector/src/main/res/layout/activity_placeholder.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:id="@+id/placeholder">
+</androidx.constraintlayout.widget.ConstraintLayout>

vector/src/main/res/xml/split_configuration.xml

@@ -0,0 +1,34 @@
+<resources
+    xmlns:window="http://schemas.android.com/apk/res-auto">
+
+    <!-- Define a split for the named activity pair. -->
+    <SplitPairRule
+        window:splitRatio="0.4"
+        window:splitMinWidth="600dp"
+        window:finishPrimaryWithSecondary="never"
+        window:finishSecondaryWithPrimary="always">
+        <SplitPairFilter
+            window:primaryActivityName="im.vector.app.features.home.HomeActivity"
+            window:secondaryActivityName="im.vector.app.features.home.room.detail.RoomDetailActivity"/>
+    </SplitPairRule>
+
+
+    <!-- Automatically launch a placeholder for the list activity. -->
+    <SplitPlaceholderRule
+        window:placeholderActivityName="im.vector.app.features.home.PlaceholderActivity"
+        window:splitRatio="0.4"
+        window:splitMinWidth="600dp">
+        <ActivityFilter
+            window:activityName="im.vector.app.features.home.HomeActivity"/>
+    </SplitPlaceholderRule>
+
+    <!-- Define activities that should never enter a split. Note: Takes
+         precedence over other split rules. -->
+    <ActivityRule
+        window:alwaysExpand="true">
+        <ActivityFilter window:activityName="im.vector.app.features.media.VectorAttachmentViewerActivity"/>
+        <ActivityFilter window:activityName="im.vector.app.features.media.BigImageViewerActivity"/>
+
+    </ActivityRule>
+
+</resources>