[wallet] change main screen if there is only one currency

If there is more than one currency, the screen shows a list of balances
per currency like it used to.
If there is only one currency, the main screen directly shows the list
of transactions with the balance in the toolbar.

3 files changed, 52 insertions, 20 deletions

diff --git a/wallet/src/main/res/layout/fragment_balances.xml b/wallet/src/main/res/layout/fragment_balances.xml
new file mode 100644
index 0000000..84c7bca
--- /dev/null
+++ b/wallet/src/main/res/layout/fragment_balances.xml
@@ -0,0 +1,43 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ This file is part of GNU Taler
+  ~ (C) 2020 Taler Systems S.A.
+  ~
+  ~ GNU Taler is free software; you can redistribute it and/or modify it under the
+  ~ terms of the GNU General Public License as published by the Free Software
+  ~ Foundation; either version 3, or (at your option) any later version.
+  ~
+  ~ GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+  ~ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+  ~ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with
+  ~ GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+  -->
+<FrameLayout 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">
+
+    <androidx.recyclerview.widget.RecyclerView
+        android:id="@+id/mainList"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:visibility="invisible"
+        app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
+        tools:listitem="@layout/list_item_balance"
+        tools:visibility="visible" />
+
+    <TextView
+        android:id="@+id/mainEmptyState"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:autoLink="web"
+        android:gravity="center"
+        android:padding="16dp"
+        android:text="@string/balances_empty_state"
+        android:textSize="18sp"
+        android:visibility="invisible"
+        tools:visibility="visible" />
+
+</FrameLayout>
diff --git a/wallet/src/main/res/layout/fragment_main.xml b/wallet/src/main/res/layout/fragment_main.xml
index 57fe73e..81121b5 100644
--- a/wallet/src/main/res/layout/fragment_main.xml
+++ b/wallet/src/main/res/layout/fragment_main.xml
@@ -15,29 +15,13 @@
   -->
 <androidx.coordinatorlayout.widget.CoordinatorLayout 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">
 
-    <androidx.recyclerview.widget.RecyclerView
-        android:id="@+id/mainList"
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/mainFragmentContainer"
         android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        android:visibility="gone"
-        tools:listitem="@layout/list_item_balance"
-        tools:visibility="visible" />
-
-    <TextView
-        android:id="@+id/mainEmptyState"
-        android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        android:autoLink="web"
-        android:gravity="center"
-        android:padding="16dp"
-        android:text="@string/balances_empty_state"
-        android:textSize="18sp"
-        android:visibility="gone"
-        tools:visibility="visible" />
+        android:layout_height="match_parent" />
 
     <com.google.android.material.floatingactionbutton.FloatingActionButton
         android:id="@+id/mainFab"
diff --git a/wallet/src/main/res/layout/fragment_transactions.xml b/wallet/src/main/res/layout/fragment_transactions.xml
index a2aebcd..aaf638c 100644
--- a/wallet/src/main/res/layout/fragment_transactions.xml
+++ b/wallet/src/main/res/layout/fragment_transactions.xml
@@ -15,6 +15,7 @@
   -->
 
 <FrameLayout 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">
@@ -23,7 +24,11 @@
         android:id="@+id/list"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        android:scrollbars="vertical" />
+        android:scrollbars="vertical"
+        android:visibility="invisible"
+        app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
+        tools:listitem="@layout/list_item_transaction"
+        tools:visibility="visible" />
 
     <TextView
         android:id="@+id/emptyState"