[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.

6 files changed, 81 insertions, 61 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"
diff --git a/wallet/src/main/res/menu/fragment_main.xml b/wallet/src/main/res/menu/fragment_main.xml
deleted file mode 100644
index d4568d4..0000000
--- a/wallet/src/main/res/menu/fragment_main.xml
+++ /dev/null
@@ -1,19 +0,0 @@
-<?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/>
-  -->
-
-<menu xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto">
-</menu>
diff --git a/wallet/src/main/res/navigation/nav_graph.xml b/wallet/src/main/res/navigation/nav_graph.xml
index ef0f48b..f8d515e 100644
--- a/wallet/src/main/res/navigation/nav_graph.xml
+++ b/wallet/src/main/res/navigation/nav_graph.xml
@@ -18,21 +18,24 @@
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/nav_graph"
-    app:startDestination="@id/showBalance"
-    tools:ignore="UnusedNavigation">
+    app:startDestination="@id/nav_main">
 
     <fragment
-        android:id="@+id/showBalance"
+        android:id="@+id/nav_main"
         android:name="net.taler.wallet.MainFragment"
         android:label="@string/balances_title"
-        tools:layout="@layout/fragment_main">
+        tools:layout="@layout/fragment_balances">
         <action
-            android:id="@+id/action_showBalance_to_promptPayment"
+            android:id="@+id/action_nav_main_to_promptPayment"
             app:destination="@id/promptPayment" />
         <action
-            android:id="@+id/action_showBalance_to_promptWithdraw"
+            android:id="@+id/action_nav_main_to_promptWithdraw"
             app:destination="@id/promptWithdraw" />
+        <action
+            android:id="@+id/action_nav_main_to_nav_transactions"
+            app:destination="@id/nav_transactions" />
     </fragment>
+
     <fragment
         android:id="@+id/promptPayment"
         android:name="net.taler.wallet.payment.PromptPaymentFragment"
@@ -41,31 +44,28 @@
         <action
             android:id="@+id/action_promptPayment_to_paymentSuccessful"
             app:destination="@id/paymentSuccessful"
-            app:popUpTo="@id/showBalance" />
+            app:popUpTo="@id/nav_main" />
         <action
             android:id="@+id/action_promptPayment_to_alreadyPaid"
             app:destination="@id/alreadyPaid"
-            app:popUpTo="@id/showBalance" />
+            app:popUpTo="@id/nav_main" />
     </fragment>
     <fragment
         android:id="@+id/paymentSuccessful"
         android:name="net.taler.wallet.payment.PaymentSuccessfulFragment"
         android:label="Payment Successful"
         tools:layout="@layout/fragment_payment_successful" />
+
     <fragment
-        android:id="@+id/settings"
+        android:id="@+id/nav_settings"
         android:name="net.taler.wallet.SettingsFragment"
-        android:label="Settings" />
+        android:label="@string/menu_settings" />
 
     <fragment
         android:id="@+id/nav_transactions"
         android:name="net.taler.wallet.transactions.TransactionsFragment"
         android:label="@string/transactions_title"
-        tools:layout="@layout/fragment_transactions">
-        <action
-            android:id="@+id/action_nav_transactions_to_nav_transaction_detail"
-            app:destination="@id/nav_transactions_detail" />
-    </fragment>
+        tools:layout="@layout/fragment_transactions" />
 
     <fragment
         android:id="@+id/nav_transactions_detail"
@@ -76,7 +76,7 @@
     <fragment
         android:id="@+id/alreadyPaid"
         android:name="net.taler.wallet.payment.AlreadyPaidFragment"
-        android:label="Already Paid"
+        android:label="@string/payment_already_paid_title"
         tools:layout="@layout/fragment_already_paid" />
 
     <fragment
@@ -90,11 +90,11 @@
         <action
             android:id="@+id/action_promptWithdraw_to_withdrawSuccessful"
             app:destination="@id/withdrawSuccessful"
-            app:popUpTo="@id/showBalance" />
+            app:popUpTo="@id/nav_main" />
         <action
             android:id="@+id/action_promptWithdraw_to_errorFragment"
             app:destination="@id/errorFragment"
-            app:popUpTo="@id/showBalance" />
+            app:popUpTo="@id/nav_main" />
         <action
             android:id="@+id/action_promptWithdraw_to_selectExchangeFragment"
             app:destination="@id/selectExchangeFragment" />
@@ -103,8 +103,9 @@
     <fragment
         android:id="@+id/withdrawSuccessful"
         android:name="net.taler.wallet.withdraw.WithdrawSuccessfulFragment"
-        android:label="Withdrawal Confirmed"
+        android:label="@string/withdraw_accepted"
         tools:layout="@layout/fragment_withdraw_successful" />
+
     <fragment
         android:id="@+id/reviewExchangeTOS"
         android:name="net.taler.wallet.withdraw.ReviewExchangeTosFragment"
@@ -113,7 +114,7 @@
         <action
             android:id="@+id/action_reviewExchangeTOS_to_promptWithdraw"
             app:destination="@id/promptWithdraw"
-            app:popUpTo="@id/showBalance" />
+            app:popUpTo="@id/nav_main" />
     </fragment>
     <fragment
         android:id="@+id/selectExchangeFragment"
@@ -124,8 +125,9 @@
     <fragment
         android:id="@+id/nav_pending_operations"
         android:name="net.taler.wallet.pending.PendingOperationsFragment"
-        android:label="Pending Operations"
+        android:label="@string/pending_operations_title"
         tools:layout="@layout/fragment_pending_operations" />
+
     <fragment
         android:id="@+id/errorFragment"
         android:name="net.taler.wallet.withdraw.ErrorFragment"
@@ -140,4 +142,8 @@
         android:id="@+id/action_global_pending_operations"
         app:destination="@id/nav_pending_operations" />
 
-</navigation>
\ No newline at end of file
+    <action
+        android:id="@+id/action_nav_transaction_detail"
+        app:destination="@id/nav_transactions_detail" />
+
+</navigation>
diff --git a/wallet/src/main/res/values/strings.xml b/wallet/src/main/res/values/strings.xml
index e0b3183..b4af3b8 100644
--- a/wallet/src/main/res/values/strings.xml
+++ b/wallet/src/main/res/values/strings.xml
@@ -80,6 +80,7 @@
     <string name="payment_hide_details">Hide Details</string>
     <string name="payment_successful">Payment was successful</string>
     <string name="payment_back_button">OK</string>
+    <string name="payment_already_paid_title">Already paid</string>
     <string name="payment_already_paid">You\'ve already paid for this order.</string>
 
     <string name="withdraw_accepted">Withdrawal accepted</string>