add split screen support

library/ui-strings/src/main/res/values/strings.xml

@@ -3417,6 +3417,10 @@
     <string name="labs_enable_client_info_recording_summary">Record the client name, version, and url to recognise sessions more easily in session manager.</string>
     <string name="labs_enable_voice_broadcast_title">Enable voice broadcast (under active development)</string>
     <string name="labs_enable_voice_broadcast_summary">Be able to record and send voice broadcast in room timeline.</string>
+    <string name="labs_enable_tablet_mode_title">Enable tablet mode (split screen)</string>
+    <string name="labs_enable_tablet_mode_summary">Allow Chats to be opened in split window.</string>
+    <string name="labs_enable_multichat_title">Enable multiwindow chats</string>
+    <string name="labs_enable_multichat_summary">Allow Multiple Chats to be opened in split windows (need tablet mode enabled).</string>
 
     <!-- Note to translators: %s will be replaces with selected space name -->
     <string name="home_empty_space_no_rooms_title">%s\nis looking a little empty.</string>

vector/src/main/java/im/vector/app/features/navigation/DefaultNavigator.kt

@@ -177,6 +177,14 @@ class DefaultNavigator @Inject constructor(
 
         val args = TimelineArgs(roomId = roomId, eventId = eventId, isInviteAlreadyAccepted = isInviteAlreadyAccepted, openAtFirstUnread = openAtFirstUnread, openAnonymously = openAnonymously)
         val intent = RoomDetailActivity.newIntent(context, args, false)
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N && vectorPreferences.isTabletModeEnabled()) {
+            intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
+            if (vectorPreferences.isMultiChatEnabled()){
+                intent.flags = intent.flags or Intent.FLAG_ACTIVITY_MULTIPLE_TASK
+            } else {
+                intent.flags = intent.flags or Intent.FLAG_ACTIVITY_LAUNCH_ADJACENT or Intent.FLAG_ACTIVITY_CLEAR_TASK
+            }
+        }
         startActivity(context, intent, buildTask)
     }
 

vector/src/main/java/im/vector/app/features/settings/VectorPreferences.kt

@@ -289,6 +289,9 @@ class VectorPreferences @Inject constructor(
         const val SETTINGS_UNVERIFIED_SESSIONS_ALERT_LAST_SHOWN_MILLIS = "SETTINGS_UNVERIFIED_SESSIONS_ALERT_LAST_SHOWN_MILLIS_"
         const val SETTINGS_NEW_LOGIN_ALERT_SHOWN_FOR_DEVICE = "SETTINGS_NEW_LOGIN_ALERT_SHOWN_FOR_DEVICE_"
 
+        const val SETTINGS_LABS_ENABLE_TABLET_MODE = "SETTINGS_LABS_ENABLE_TABLET_MODE"
+        const val SETTINGS_LABS_ENABLE_MULTICHAT = "SETTINGS_LABS_ENABLE_MULTICHAT"
+
         // Possible values for TAKE_PHOTO_VIDEO_MODE
         const val TAKE_PHOTO_VIDEO_MODE_ALWAYS_ASK = 0
         const val TAKE_PHOTO_VIDEO_MODE_PHOTO = 1
@@ -1558,4 +1561,13 @@ class VectorPreferences @Inject constructor(
             putBoolean(SETTINGS_NEW_LOGIN_ALERT_SHOWN_FOR_DEVICE + deviceId, true)
         }
     }
+
+    fun isTabletModeEnabled(): Boolean {
+        return defaultPrefs.getBoolean(SETTINGS_LABS_ENABLE_TABLET_MODE, false)
+    }
+
+
+    fun isMultiChatEnabled(): Boolean {
+        return defaultPrefs.getBoolean(SETTINGS_LABS_ENABLE_MULTICHAT, false)
+    }
 }

vector/src/main/java/im/vector/app/features/settings/labs/VectorSettingsLabsFragment.kt

@@ -121,8 +121,17 @@ class VectorSettingsLabsFragment :
             pref.isVisible = Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q && vectorFeatures.isVoiceBroadcastEnabled()
         }
 
+        findPreference<VectorSwitchPreference>(VectorPreferences.SETTINGS_LABS_ENABLE_TABLET_MODE)?.let { pref ->
+            pref.isVisible = Build.VERSION.SDK_INT >= Build.VERSION_CODES.N
+            pref.onPreferenceClickListener = Preference.OnPreferenceClickListener {
+                onTabletModePreferenceClicked()
+                true
+            }
+        }
+
         configureUnreadNotificationsAsTabPreference()
         configureEnableClientInfoRecordingPreference()
+        configureMultiChatPreference()
     }
 
     private fun configureUnreadNotificationsAsTabPreference() {
@@ -132,6 +141,12 @@ class VectorSettingsLabsFragment :
         }
     }
 
+    private fun configureMultiChatPreference() {
+        findPreference<VectorSwitchPreference>(VectorPreferences.SETTINGS_LABS_ENABLE_MULTICHAT)?.let { pref ->
+            pref.isEnabled = vectorPreferences.isTabletModeEnabled()
+        }
+    }
+
     /**
      * Intercept the click to display a user friendly dialog when their homeserver do not support threads.
      */
@@ -180,6 +195,10 @@ class VectorSettingsLabsFragment :
         configureUnreadNotificationsAsTabPreference()
     }
 
+    private fun onTabletModePreferenceClicked() {
+        configureMultiChatPreference()
+    }
+
     private fun configureEnableClientInfoRecordingPreference() {
         findPreference<VectorSwitchPreference>(VectorPreferences.SETTINGS_LABS_CLIENT_INFO_RECORDING_KEY)?.onPreferenceChangeListener =
                 OnPreferenceChangeListener { _, newValue ->

vector/src/main/res/xml/vector_settings_labs.xml

@@ -43,6 +43,18 @@
             android:title="@string/url_previews_in_encrypted_rooms"
             android:summary="@string/url_previews_in_encrypted_rooms_summary" />
 
+        <im.vector.app.core.preference.VectorSwitchPreference
+            android:defaultValue="false"
+            android:key="SETTINGS_LABS_ENABLE_TABLET_MODE"
+            android:summary="@string/labs_enable_tablet_mode_summary"
+            android:title="@string/labs_enable_tablet_mode_title" />
+
+        <im.vector.app.core.preference.VectorSwitchPreference
+            android:defaultValue="false"
+            android:key="SETTINGS_LABS_ENABLE_MULTICHAT"
+            android:summary="@string/labs_enable_multichat_summary"
+            android:title="@string/labs_enable_multichat_title" />
+
     </im.vector.app.core.preference.VectorPreferenceCategory>
 
     <im.vector.app.core.preference.VectorPreferenceCategory