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[taler-wallet-android] 02/04: Make initial screen look nicer and clean u


From: gnunet
Subject: [taler-wallet-android] 02/04: Make initial screen look nicer and clean up its code
Date: Thu, 05 Mar 2020 16:49:37 +0100

This is an automated email from the git hooks/post-receive script.

torsten-grote pushed a commit to branch master
in repository wallet-android.

commit 8589d5cae8087acbf25e7251e341f99fd2c7f9e2
Author: Torsten Grote <address@hidden>
AuthorDate: Thu Mar 5 11:27:24 2020 -0300

    Make initial screen look nicer and clean up its code
---
 app/src/main/java/net/taler/wallet/MainActivity.kt |   4 +-
 app/src/main/java/net/taler/wallet/ShowBalance.kt  | 158 +++++++---------
 .../main/java/net/taler/wallet/WalletViewModel.kt  |  30 ++-
 .../net/taler/wallet/withdraw/WithdrawManager.kt   |   2 +-
 app/src/main/res/drawable/ic_scan_qr.xml           | 208 +--------------------
 app/src/main/res/layout/app_bar_main.xml           |   9 +-
 app/src/main/res/layout/fragment_show_balance.xml  | 112 ++++++-----
 app/src/main/res/values/strings.xml                |   2 +-
 8 files changed, 168 insertions(+), 357 deletions(-)

diff --git a/app/src/main/java/net/taler/wallet/MainActivity.kt 
b/app/src/main/java/net/taler/wallet/MainActivity.kt
index 5267056..1cdc9b3 100644
--- a/app/src/main/java/net/taler/wallet/MainActivity.kt
+++ b/app/src/main/java/net/taler/wallet/MainActivity.kt
@@ -24,7 +24,7 @@ import android.content.IntentFilter
 import android.os.Bundle
 import android.util.Log
 import android.view.MenuItem
-import android.view.View.GONE
+import android.view.View.INVISIBLE
 import android.view.View.VISIBLE
 import androidx.activity.viewModels
 import androidx.appcompat.app.AppCompatActivity
@@ -74,7 +74,7 @@ class MainActivity : AppCompatActivity(), 
OnNavigationItemSelectedListener,
         toolbar.setupWithNavController(nav, appBarConfiguration)
 
         model.showProgressBar.observe(this, Observer { show ->
-            progress_bar.visibility = if (show) VISIBLE else GONE
+            progress_bar.visibility = if (show) VISIBLE else INVISIBLE
         })
 
         if (intent.action == ACTION_VIEW) intent.dataString?.let { uri ->
diff --git a/app/src/main/java/net/taler/wallet/ShowBalance.kt 
b/app/src/main/java/net/taler/wallet/ShowBalance.kt
index fe1a109..5448638 100644
--- a/app/src/main/java/net/taler/wallet/ShowBalance.kt
+++ b/app/src/main/java/net/taler/wallet/ShowBalance.kt
@@ -18,6 +18,7 @@ package net.taler.wallet
 
 import android.annotation.SuppressLint
 import android.os.Bundle
+import android.transition.TransitionManager.beginDelayedTransition
 import android.util.Log
 import android.view.LayoutInflater
 import android.view.Menu
@@ -27,25 +28,26 @@ import android.view.View
 import android.view.View.GONE
 import android.view.View.VISIBLE
 import android.view.ViewGroup
-import android.widget.Button
 import android.widget.TextView
 import androidx.fragment.app.Fragment
 import androidx.fragment.app.activityViewModels
 import androidx.lifecycle.Observer
 import androidx.recyclerview.widget.DividerItemDecoration
 import androidx.recyclerview.widget.LinearLayoutManager
-import androidx.recyclerview.widget.RecyclerView
+import androidx.recyclerview.widget.LinearLayoutManager.VERTICAL
+import androidx.recyclerview.widget.RecyclerView.Adapter
+import androidx.recyclerview.widget.RecyclerView.ViewHolder
 import com.google.zxing.integration.android.IntentIntegrator
 import com.google.zxing.integration.android.IntentIntegrator.QR_CODE_TYPES
+import kotlinx.android.synthetic.main.fragment_show_balance.*
+import net.taler.wallet.BalanceAdapter.BalanceViewHolder
 
 class ShowBalance : Fragment() {
 
     private val model: WalletViewModel by activityViewModels()
     private val withdrawManager by lazy { model.withdrawManager }
 
-    private lateinit var balancesView: RecyclerView
-    private lateinit var balancesPlaceholderView: TextView
-    private lateinit var balancesAdapter: BalanceAdapter
+    private val balancesAdapter = BalanceAdapter()
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -53,68 +55,52 @@ class ShowBalance : Fragment() {
     }
 
     override fun onCreateView(
-        inflater: LayoutInflater, container: ViewGroup?,
+        inflater: LayoutInflater,
+        container: ViewGroup?,
         savedInstanceState: Bundle?
     ): View? {
-        // Inflate the layout for this fragment
-        val view = inflater.inflate(R.layout.fragment_show_balance, container, 
false)
-        val payQrButton = view.findViewById<Button>(R.id.button_pay_qr)
-        payQrButton.setOnClickListener {
-            IntentIntegrator(activity).apply {
-                setBeepEnabled(true)
-                setOrientationLocked(false)
-            }.initiateScan(QR_CODE_TYPES)
-        }
-
-        this.balancesView = view.findViewById(R.id.list_balances)
-        this.balancesPlaceholderView = 
view.findViewById(R.id.list_balances_placeholder)
-
-        val balances = model.balances.value!!
-
-        balancesAdapter = BalanceAdapter(balances)
+        return inflater.inflate(R.layout.fragment_show_balance, container, 
false)
+    }
 
-        view.findViewById<RecyclerView>(R.id.list_balances).apply {
-            val myLayoutManager = LinearLayoutManager(context)
-            val myItemDecoration = DividerItemDecoration(context, 
myLayoutManager.orientation)
-            layoutManager = myLayoutManager
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        balancesList.apply {
+            layoutManager = LinearLayoutManager(context)
             adapter = balancesAdapter
-            addItemDecoration(myItemDecoration)
+            addItemDecoration(DividerItemDecoration(context, VERTICAL))
         }
 
-        updateBalances(balances)
-
         model.balances.observe(viewLifecycleOwner, Observer {
-            triggerLoading()
-            updateBalances(it)
+            onBalancesChanged(it)
         })
 
-
-        val withdrawTestkudosButton = 
view.findViewById<Button>(R.id.button_withdraw_testkudos)
-        withdrawTestkudosButton.setOnClickListener {
+        testWithdrawButton.setOnClickListener {
             withdrawManager.withdrawTestkudos()
         }
 
         withdrawManager.testWithdrawalInProgress.observe(viewLifecycleOwner, 
Observer { loading ->
             Log.v("taler-wallet", "observing balance loading $loading in show 
balance")
-            withdrawTestkudosButton.isEnabled = !loading
-            triggerLoading()
+            testWithdrawButton.isEnabled = !loading
+            model.showProgressBar.value = loading
         })
 
-        return view
+        scanButton.setOnClickListener {
+            IntentIntegrator(activity).apply {
+                setPrompt("")
+                setBeepEnabled(true)
+                setOrientationLocked(false)
+            }.initiateScan(QR_CODE_TYPES)
+        }
     }
 
-    override fun onResume() {
-        super.onResume()
-        triggerLoading()
-        Log.v("taler-wallet", "called onResume on ShowBalance")
+    override fun onStart() {
+        super.onStart()
+        model.loadBalances()
     }
 
     override fun onOptionsItemSelected(item: MenuItem): Boolean {
         return when (item.itemId) {
             R.id.reload_balance -> {
-                triggerLoading()
-                model.balances.value = WalletBalances(false, listOf())
-                model.getBalances()
+                model.loadBalances()
                 true
             }
             else -> super.onOptionsItemSelected(item)
@@ -126,72 +112,64 @@ class ShowBalance : Fragment() {
         super.onCreateOptionsMenu(menu, inflater)
     }
 
-    private fun triggerLoading() {
-        val withdrawInProgress = 
withdrawManager.testWithdrawalInProgress.value == true
-        val balances = model.balances.value
-        val loading: Boolean = (withdrawInProgress) || (balances == null) || 
!balances.initialized
-        model.showProgressBar.value = loading
-    }
-
-    private fun updateBalances(balances: WalletBalances) {
-        if (!balances.initialized) {
-            balancesPlaceholderView.visibility = GONE
-            balancesView.visibility = GONE
-        } else if (balances.byCurrency.isEmpty()) {
-            balancesPlaceholderView.visibility = VISIBLE
-            balancesView.visibility = GONE
+    private fun onBalancesChanged(balances: List<BalanceItem>) {
+        beginDelayedTransition(view as ViewGroup)
+        if (balances.isEmpty()) {
+            balancesEmptyState.visibility = VISIBLE
+            balancesList.visibility = GONE
         } else {
-            balancesPlaceholderView.visibility = GONE
-            balancesView.visibility = VISIBLE
+            balancesAdapter.setItems(balances)
+            balancesEmptyState.visibility = GONE
+            balancesList.visibility = VISIBLE
         }
-        Log.v(TAG, "updating balances $balances")
-        balancesAdapter.update(balances)
     }
 
 }
 
-class BalanceAdapter(private var myDataset: WalletBalances) :
-    RecyclerView.Adapter<BalanceAdapter.BalanceViewHolder>() {
+class BalanceAdapter : Adapter<BalanceViewHolder>() {
+
+    private var items = emptyList<BalanceItem>()
 
     init {
         setHasStableIds(false)
     }
 
     override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): 
BalanceViewHolder {
-        val rowView =
-            LayoutInflater.from(parent.context).inflate(R.layout.balance_row, 
parent, false)
-        return BalanceViewHolder(rowView)
+        val v = 
LayoutInflater.from(parent.context).inflate(R.layout.balance_row, parent, false)
+        return BalanceViewHolder(v)
     }
 
-    override fun getItemCount(): Int {
-        return myDataset.byCurrency.size
-    }
+    override fun getItemCount() = items.size
 
     override fun onBindViewHolder(holder: BalanceViewHolder, position: Int) {
-        val amount = myDataset.byCurrency[position].available
-        val amountIncoming = myDataset.byCurrency[position].pendingIncoming
-        val currencyView = 
holder.rowView.findViewById<TextView>(R.id.balance_currency)
-        currencyView.text = amount.currency
-        val amountView = 
holder.rowView.findViewById<TextView>(R.id.balance_amount)
-        amountView.text = amount.amount
-
-        val amountIncomingRow = 
holder.rowView.findViewById<View>(R.id.balance_row_pending)
-
-        val amountIncomingView = 
holder.rowView.findViewById<TextView>(R.id.balance_pending)
-        if (amountIncoming.isZero()) {
-            amountIncomingRow.visibility = GONE
-        } else {
-            amountIncomingRow.visibility = VISIBLE
-            @SuppressLint("SetTextI18n")
-            amountIncomingView.text = "${amountIncoming.amount} 
${amountIncoming.currency}"
-        }
+        val item = items[position]
+        holder.bind(item)
     }
 
-    fun update(updatedBalances: WalletBalances) {
-        this.myDataset = updatedBalances
+    fun setItems(items: List<BalanceItem>) {
+        this.items = items
         this.notifyDataSetChanged()
     }
 
-    class BalanceViewHolder(val rowView: View) : 
RecyclerView.ViewHolder(rowView)
+    class BalanceViewHolder(v: View) : ViewHolder(v) {
+        private val currencyView: TextView = 
v.findViewById(R.id.balance_currency)
+        private val amountView: TextView = v.findViewById(R.id.balance_amount)
+        private val amountIncomingRow: View = 
v.findViewById(R.id.balance_row_pending)
+        private val amountIncomingView: TextView = 
v.findViewById(R.id.balance_pending)
+
+        fun bind(item: BalanceItem) {
+            currencyView.text = item.available.currency
+            amountView.text = item.available.amount
+
+            val amountIncoming = item.pendingIncoming
+            if (amountIncoming.isZero()) {
+                amountIncomingRow.visibility = GONE
+            } else {
+                amountIncomingRow.visibility = VISIBLE
+                @SuppressLint("SetTextI18n")
+                amountIncomingView.text = "${amountIncoming.amount} 
${amountIncoming.currency}"
+            }
+        }
+    }
 
 }
diff --git a/app/src/main/java/net/taler/wallet/WalletViewModel.kt 
b/app/src/main/java/net/taler/wallet/WalletViewModel.kt
index 2ec88af..7baedcf 100644
--- a/app/src/main/java/net/taler/wallet/WalletViewModel.kt
+++ b/app/src/main/java/net/taler/wallet/WalletViewModel.kt
@@ -23,6 +23,7 @@ import androidx.lifecycle.AndroidViewModel
 import androidx.lifecycle.LiveData
 import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.asLiveData
+import androidx.lifecycle.distinctUntilChanged
 import androidx.lifecycle.switchMap
 import 
com.fasterxml.jackson.databind.DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES
 import com.fasterxml.jackson.databind.ObjectMapper
@@ -43,19 +44,13 @@ import org.json.JSONObject
 
 const val TAG = "taler-wallet"
 
-
-data class BalanceEntry(val available: Amount, val pendingIncoming: Amount)
-
-
-data class WalletBalances(val initialized: Boolean, val byCurrency: 
List<BalanceEntry>)
-
+data class BalanceItem(val available: Amount, val pendingIncoming: Amount)
 
 @Suppress("EXPERIMENTAL_API_USAGE")
 class WalletViewModel(val app: Application) : AndroidViewModel(app) {
 
-    val balances = MutableLiveData<WalletBalances>().apply {
-        value = WalletBalances(false, listOf())
-    }
+    private val mBalances = MutableLiveData<List<BalanceItem>>()
+    val balances: LiveData<List<BalanceItem>> = 
mBalances.distinctUntilChanged()
 
     private val mHistoryProgress = MutableLiveData<Boolean>()
     val historyProgress: LiveData<Boolean> = mHistoryProgress
@@ -75,11 +70,11 @@ class WalletViewModel(val app: Application) : 
AndroidViewModel(app) {
 
     private val walletBackendApi = WalletBackendApi(app, {
         activeGetBalance = 0
-        getBalances()
+        loadBalances()
         pendingOperationsManager.getPending()
     }) {
         Log.i(TAG, "Received notification from wallet-core")
-        getBalances()
+        loadBalances()
         pendingOperationsManager.getPending()
     }
 
@@ -92,17 +87,19 @@ class WalletViewModel(val app: Application) : 
AndroidViewModel(app) {
     val pendingOperationsManager: PendingOperationsManager =
         PendingOperationsManager(walletBackendApi)
 
-    fun getBalances() {
+    @UiThread
+    fun loadBalances() {
         if (activeGetBalance > 0) {
             return
         }
         activeGetBalance++
+        showProgressBar.value = true
         walletBackendApi.sendRequest("getBalances", null) { isError, result ->
             activeGetBalance--
             if (isError) {
                 return@sendRequest
             }
-            val balanceList = mutableListOf<BalanceEntry>()
+            val balanceList = mutableListOf<BalanceItem>()
             val byCurrency = result.getJSONObject("byCurrency")
             val currencyList = byCurrency.keys().asSequence().toList().sorted()
             for (currency in currencyList) {
@@ -112,9 +109,10 @@ class WalletViewModel(val app: Application) : 
AndroidViewModel(app) {
                 val jsonAmountIncoming = byCurrency.getJSONObject(currency)
                     .getJSONObject("pendingIncoming")
                 val amountIncoming = Amount.fromJson(jsonAmountIncoming)
-                balanceList.add(BalanceEntry(amount, amountIncoming))
+                balanceList.add(BalanceItem(amount, amountIncoming))
             }
-            balances.postValue(WalletBalances(true, balanceList))
+            mBalances.postValue(balanceList)
+            showProgressBar.postValue(false)
         }
     }
 
@@ -145,7 +143,7 @@ class WalletViewModel(val app: Application) : 
AndroidViewModel(app) {
     fun dangerouslyReset() {
         walletBackendApi.sendRequest("reset", null)
         withdrawManager.testWithdrawalInProgress.value = false
-        balances.value = WalletBalances(false, listOf())
+        mBalances.value = emptyList()
     }
 
     fun startTunnel() {
diff --git a/app/src/main/java/net/taler/wallet/withdraw/WithdrawManager.kt 
b/app/src/main/java/net/taler/wallet/withdraw/WithdrawManager.kt
index fa20318..dec03af 100644
--- a/app/src/main/java/net/taler/wallet/withdraw/WithdrawManager.kt
+++ b/app/src/main/java/net/taler/wallet/withdraw/WithdrawManager.kt
@@ -46,7 +46,7 @@ sealed class WithdrawStatus {
 class WithdrawManager(private val walletBackendApi: WalletBackendApi) {
 
     val withdrawStatus = MutableLiveData<WithdrawStatus>(WithdrawStatus.None)
-    val testWithdrawalInProgress = MutableLiveData<Boolean>(false)
+    val testWithdrawalInProgress = MutableLiveData(false)
 
     private var currentWithdrawRequestId = 0
 
diff --git a/app/src/main/res/drawable/ic_scan_qr.xml 
b/app/src/main/res/drawable/ic_scan_qr.xml
index a6d1172..2ca8a69 100644
--- a/app/src/main/res/drawable/ic_scan_qr.xml
+++ b/app/src/main/res/drawable/ic_scan_qr.xml
@@ -1,202 +1,10 @@
-<!--
-  ~ 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/>
-  -->
-
 <vector xmlns:android="http://schemas.android.com/apk/res/android";
-        android:width="200dp"
-        android:height="200dp"
-        android:viewportWidth="278"
-        android:viewportHeight="278">
-    <path
-            android:fillColor="#FFFFFF"
-            android:fillType="nonZero"
-            android:pathData="M103,28l0,77 -76,0 0,-77 76,0zM93,38l-56,0 0,57 
56,0 0,-57z" />
-    <path
-            android:fillColor="#FFFFFF"
-            android:fillType="nonZero"
-            android:pathData="M251,28l0,77 -76,0 0,-77 76,0zM241,38l-56,0 0,57 
56,0 0,-57z" />
-    <path
-            android:fillColor="#FFFFFF"
-            android:fillType="nonZero"
-            android:pathData="M103,174l0,76 -76,0 0,-76 76,0zM93,184l-56,0 
0,56 56,0 0,-56z" />
-    <path
-            android:fillColor="#FFFFFF"
-            android:fillType="nonZero"
-            
android:pathData="M157,240l0,-12l-10,0l0,12l-12,0l0,-21l20,0l0,-10l-33,0l0,-9l-10,0l1,19l12,0l0,11l-13,0l0,10l13,0l0,10l42,0l0,-10z"
 />
-    <path
-            android:fillColor="#FFFFFF"
-            android:fillType="nonZero"
-            android:pathData="M38,123l-11,0l0,-10l11,0z" />
-    <path
-            android:fillColor="#FFFFFF"
-            android:fillType="nonZero"
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-            android:fillColor="#FFFFFF"
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-            android:fillColor="#FFFFFF"
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-            android:fillColor="#FFFFFF"
-            android:fillType="nonZero"
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android:pathData="M50,144l10,0l0,-10l-10,0l0,-10l-10,0l0,9l-12,0l0,24l12,0l0,8l31,0l0,-19l-11,0l0,9l-10,0z"
 />
-    <path
-            android:fillColor="#FFFFFF"
-            android:fillType="nonZero"
-            android:pathData="M242,113l0,10 9,0 0,10 -16,0 0,13 -29,0 0,9 16,0 
0,23 -11,0 0,-13 -23,0 0,-10 8,0 0,-9 -6,0 0,-10 33,0 0,-18 -13,0 0,-5c10,0 
21,0 32,0z" />
-    <path
-            android:fillColor="#FFFFFF"
-            android:fillType="nonZero"
-            
android:pathData="M121,123l-31,0l0,10l-21,0l0,-10l-11,0l0,-10l63,0z" />
-    <path
-            android:fillColor="#FFFFFF"
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/>
-    <path
-            android:fillColor="#FFFFFF"
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11,0c0,-9 0,-18 0,-27l-24,0 0,11 10,0 0,5z" />
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android:pathData="M172,196l-15,0l0,-10l-32,0l0,10l23,0l0,10l12,0l0,11l46,0l0,-11l-13,0l0,-10l-11,0l0,10l-10,0z"
 />
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-            android:fillColor="#FFFFFF"
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-31,0l0,-10 12,0 0,-20z" />
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/>
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0,10z" />
-    <path
-            android:fillColor="#FFFFFF"
-            android:fillType="nonZero"
-            android:pathData="M237,236l-11,0l0,-10l11,0z" />
-    <path
-            android:fillColor="#FFFFFF"
-            android:fillType="nonZero"
-            android:pathData="M82,82l-34,0l0,-32l34,0z" />
-    <path
-            android:fillColor="#FFFFFF"
-            android:fillType="nonZero"
-            android:pathData="M230,82l-34,0l0,-32l34,0z" />
-    <path
-            android:fillColor="#FFFFFF"
-            android:fillType="nonZero"
-            android:pathData="M82,228l-34,0l0,-32l34,0z" />
-    <path
-            android:fillColor="#FFFFFF"
-            android:fillType="nonZero"
-            android:pathData="M183,250l-11,0l0,-10l11,0z" />
-    <path
-            android:fillColor="#FFFFFF"
-            android:fillType="nonZero"
-            android:pathData="M140,162l-11,0l0,-10l11,0z" />
-    <path
-            android:fillColor="#FFFFFF"
-            android:fillType="nonZero"
-            android:pathData="M218,132l-10,0l0,-10l10,0z" />
-    <path
-            android:fillColor="#FFFFFF"
-            android:fillType="nonZero"
-            android:pathData="M193,123l-11,0l0,-10l11,0z" />
-    <path
-            android:fillColor="#FFFFFF"
-            android:fillType="nonZero"
-            android:pathData="M251,159l-10,0l0,-10l10,0z" />
-    <path
-            android:fillColor="#FFFFFF"
-            android:fillType="nonZero"
-            android:pathData="M0,53l0,-53l54,0l0,10l-44,0l0,43z" />
-    <path
-            android:fillColor="#FFFFFF"
-            android:fillType="nonZero"
-            android:pathData="M278,53l0,-53l-54,0l0,10l44,0l0,43z" />
-    <path
-            android:fillColor="#FFFFFF"
-            android:fillType="nonZero"
-            android:pathData="M0,225l0,53l54,0l0,-10l-44,0l0,-43z" />
-    <path
-            android:fillColor="#FFFFFF"
-            android:fillType="nonZero"
-            android:pathData="M278,225l0,53l-54,0l0,-10l44,0l0,-43z" />
+        android:width="24dp"
+        android:height="24dp"
+        android:tint="?attr/colorOnPrimarySurface"
+        android:viewportWidth="24"
+        android:viewportHeight="24">
+    <path
+            android:fillColor="#000"
+            
android:pathData="M4,4H10V10H4V4M20,4V10H14V4H20M14,15H16V13H14V11H16V13H18V11H20V13H18V15H20V18H18V20H16V18H13V20H11V16H14V15M16,15V18H18V15H16M4,20V14H10V20H4M6,6V8H8V6H6M16,6V8H18V6H16M6,16V18H8V16H6M4,11H6V13H4V11M9,11H13V15H11V13H9V11M11,6H13V10H11V6M2,2V6H0V2A2,2
 0 0,1 2,0H6V2H2M22,0A2,2 0 0,1 24,2V6H22V2H18V0H22M2,18V22H6V24H2A2,2 0 0,1 
0,22V18H2M22,22V18H24V22A2,2 0 0,1 22,24H18V22H22Z" />
 </vector>
diff --git a/app/src/main/res/layout/app_bar_main.xml 
b/app/src/main/res/layout/app_bar_main.xml
index e2fa71f..d976be8 100644
--- a/app/src/main/res/layout/app_bar_main.xml
+++ b/app/src/main/res/layout/app_bar_main.xml
@@ -43,13 +43,14 @@
             <me.zhanghai.android.materialprogressbar.MaterialProgressBar
                     android:id="@+id/progress_bar"
                     
style="@style/Widget.MaterialProgressBar.ProgressBar.Horizontal"
-                    android:layout_width="match_parent"
+                    android:layout_width="0dp"
                     android:layout_height="4dp"
+                    android:elevation="4dp"
                     android:indeterminate="true"
-                    android:visibility="gone"
-                    app:layout_constraintBottom_toBottomOf="parent"
+                    android:visibility="invisible"
+                    app:layout_constraintBottom_toBottomOf="@+id/toolbar"
+                    app:layout_constraintEnd_toEndOf="parent"
                     app:layout_constraintStart_toStartOf="parent"
-                    app:layout_constraintTop_toBottomOf="@+id/toolbar"
                     app:mpb_progressStyle="horizontal"
                     app:mpb_useIntrinsicPadding="false"
                     tools:visibility="visible" />
diff --git a/app/src/main/res/layout/fragment_show_balance.xml 
b/app/src/main/res/layout/fragment_show_balance.xml
index db50754..969201a 100644
--- a/app/src/main/res/layout/fragment_show_balance.xml
+++ b/app/src/main/res/layout/fragment_show_balance.xml
@@ -13,54 +13,80 @@
   ~ 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/>
   -->
-
-<androidx.core.widget.NestedScrollView 
xmlns:android="http://schemas.android.com/apk/res/android";
+<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:layout_margin="15dp">
-
-    <LinearLayout
-            android:layout_width="match_parent"
-            android:layout_height="match_parent"
-            android:orientation="vertical">
-
-        <View
-                android:id="@+id/header"
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content" />
-
-        <androidx.recyclerview.widget.RecyclerView
-                android:id="@+id/list_balances"
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                android:scrollbars="vertical"
-                tools:listitem="@layout/balance_row" />
+        android:layout_height="match_parent">
 
-        <TextView
-                android:id="@+id/list_balances_placeholder"
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:layout_gravity="center"
-                android:text="@string/balance_no_cash"
-                tools:visibility="gone" />
+    <androidx.recyclerview.widget.RecyclerView
+            android:id="@+id/balancesList"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_margin="16dp"
+            android:visibility="gone"
+            app:layout_constraintBottom_toTopOf="@+id/scanButton"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent"
+            app:layout_constraintVertical_bias="0.0"
+            app:layout_constraintVertical_chainStyle="packed"
+            tools:layout_height="200dp"
+            tools:listitem="@layout/balance_row"
+            tools:visibility="visible" />
 
-        <Space
-                android:layout_width="match_parent"
-                android:layout_height="20dp" />
+    <TextView
+            android:id="@+id/balancesEmptyState"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:autoLink="web"
+            android:gravity="center"
+            android:padding="16dp"
+            android:text="@string/balance_no_cash"
+            android:textSize="18sp"
+            android:visibility="gone"
+            app:layout_constraintBottom_toTopOf="@+id/scanButton"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent"
+            tools:visibility="visible" />
 
-        <Button
-                android:id="@+id/button_withdraw_testkudos"
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:text="@string/withdraw_button_testkudos" />
+    <androidx.constraintlayout.widget.Barrier
+            android:id="@+id/barrier"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            app:barrierAllowsGoneWidgets="false"
+            app:barrierDirection="bottom"
+            app:constraint_referenced_ids="balancesList, balancesEmptyState" />
 
-        <Button
-                android:id="@+id/button_pay_qr"
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:text="@string/button_scan_qr_code" />
+    <Button
+            android:id="@+id/scanButton"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_margin="16dp"
+            android:drawableLeft="@drawable/ic_scan_qr"
+            android:padding="16dp"
+            android:text="@string/button_scan_qr_code"
+            app:layout_constraintBottom_toTopOf="@+id/testWithdrawButton"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@+id/barrier"
+            app:layout_constraintVertical_chainStyle="packed"
+            tools:ignore="RtlHardcoded" />
 
-    </LinearLayout>
+    <Button
+            android:id="@+id/testWithdrawButton"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="16dp"
+            android:layout_marginTop="16dp"
+            android:layout_marginEnd="16dp"
+            android:padding="16dp"
+            android:text="@string/withdraw_button_testkudos"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@+id/scanButton"
+            tools:visibility="visible" />
 
-</androidx.core.widget.NestedScrollView>
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/app/src/main/res/values/strings.xml 
b/app/src/main/res/values/strings.xml
index 0b69c3c..ddf2246 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -79,7 +79,7 @@
     <string name="withdraw_button_confirm">Confirm Withdraw</string>
 
     <string name="balance_inbound">inbound</string>
-    <string name="balance_no_cash">There is no digital cash in your 
wallet.</string>
+    <string name="balance_no_cash">There is no digital cash in your 
wallet.\n\nYou can get test money from the demo 
bank:\n\nhttps://bank.demo.taler.net</string>
 
     <string name="pending_operations_label">Pending Operations:</string>
     <string name="pending_operations_refuse">Refuse Proposal</string>

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