[wallet] show simplified transactions per currency

8 files changed, 141 insertions, 151 deletions

diff --git a/wallet/src/main/java/net/taler/wallet/MainFragment.kt b/wallet/src/main/java/net/taler/wallet/MainFragment.kt
index 2145596..e0e6f51 100644
--- a/wallet/src/main/java/net/taler/wallet/MainFragment.kt
+++ b/wallet/src/main/java/net/taler/wallet/MainFragment.kt
@@ -35,7 +35,7 @@ import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.LinearLayoutManager.VERTICAL
 import com.google.zxing.integration.android.IntentIntegrator
 import com.google.zxing.integration.android.IntentIntegrator.QR_CODE
-import kotlinx.android.synthetic.main.fragment_show_balance.*
+import kotlinx.android.synthetic.main.fragment_main.*
 
 interface BalanceClickListener {
     fun onBalanceClick(currency: String)
@@ -57,7 +57,7 @@ class MainFragment : Fragment(), BalanceClickListener {
         container: ViewGroup?,
         savedInstanceState: Bundle?
     ): View? {
-        return inflater.inflate(R.layout.fragment_show_balance, container, false)
+        return inflater.inflate(R.layout.fragment_main, container, false)
     }
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
@@ -68,7 +68,7 @@ class MainFragment : Fragment(), BalanceClickListener {
         }
 
         model.balances.observe(viewLifecycleOwner, Observer {
-            onBalancesChanged(it)
+            onBalancesChanged(it.values.toList())
         })
 
         mainFab.setOnClickListener {
@@ -117,6 +117,7 @@ class MainFragment : Fragment(), BalanceClickListener {
     }
 
     override fun onBalanceClick(currency: String) {
+        model.transactionManager.selectedCurrency = currency
         findNavController().navigate(R.id.nav_transactions)
     }
 
diff --git a/wallet/src/main/java/net/taler/wallet/MainViewModel.kt b/wallet/src/main/java/net/taler/wallet/MainViewModel.kt
index c1662c8..907278c 100644
--- a/wallet/src/main/java/net/taler/wallet/MainViewModel.kt
+++ b/wallet/src/main/java/net/taler/wallet/MainViewModel.kt
@@ -28,10 +28,10 @@ import com.fasterxml.jackson.databind.ObjectMapper
 import com.fasterxml.jackson.module.kotlin.KotlinModule
 import net.taler.common.Amount
 import net.taler.wallet.backend.WalletBackendApi
-import net.taler.wallet.transactions.TransactionManager
 import net.taler.wallet.payment.PaymentManager
 import net.taler.wallet.pending.PendingOperationsManager
 import net.taler.wallet.refund.RefundManager
+import net.taler.wallet.transactions.TransactionManager
 import net.taler.wallet.withdraw.WithdrawManager
 import org.json.JSONObject
 
@@ -41,8 +41,8 @@ data class BalanceItem(val available: Amount, val pendingIncoming: Amount)
 
 class MainViewModel(val app: Application) : AndroidViewModel(app) {
 
-    private val mBalances = MutableLiveData<List<BalanceItem>>()
-    val balances: LiveData<List<BalanceItem>> = mBalances.distinctUntilChanged()
+    private val mBalances = MutableLiveData<Map<String, BalanceItem>>()
+    val balances: LiveData<Map<String, BalanceItem>> = mBalances.distinctUntilChanged()
 
     val devMode = MutableLiveData(BuildConfig.DEBUG)
     val showProgressBar = MutableLiveData<Boolean>()
@@ -82,7 +82,7 @@ class MainViewModel(val app: Application) : AndroidViewModel(app) {
                 Log.e(TAG, "Error retrieving balances: ${result.toString(2)}")
                 return@sendRequest
             }
-            val balanceList = mutableListOf<BalanceItem>()
+            val balanceMap = HashMap<String, BalanceItem>()
             val byCurrency = result.getJSONObject("byCurrency")
             val currencyList = byCurrency.keys().asSequence().toList().sorted()
             for (currency in currencyList) {
@@ -92,9 +92,9 @@ class MainViewModel(val app: Application) : AndroidViewModel(app) {
                 val jsonAmountIncoming = byCurrency.getJSONObject(currency)
                     .getJSONObject("pendingIncoming")
                 val amountIncoming = Amount.fromJsonObject(jsonAmountIncoming)
-                balanceList.add(BalanceItem(amount, amountIncoming))
+                balanceMap[currency] = BalanceItem(amount, amountIncoming)
             }
-            mBalances.postValue(balanceList)
+            mBalances.postValue(balanceMap)
             showProgressBar.postValue(false)
         }
     }
@@ -103,7 +103,7 @@ class MainViewModel(val app: Application) : AndroidViewModel(app) {
     fun dangerouslyReset() {
         walletBackendApi.sendRequest("reset", null)
         withdrawManager.testWithdrawalInProgress.value = false
-        mBalances.value = emptyList()
+        mBalances.value = emptyMap()
     }
 
     fun startTunnel() {
diff --git a/wallet/src/main/java/net/taler/wallet/pending/PendingOperationsFragment.kt b/wallet/src/main/java/net/taler/wallet/pending/PendingOperationsFragment.kt
index 1e776d4..2eb8721 100644
--- a/wallet/src/main/java/net/taler/wallet/pending/PendingOperationsFragment.kt
+++ b/wallet/src/main/java/net/taler/wallet/pending/PendingOperationsFragment.kt
@@ -139,7 +139,7 @@ class PendingOperationsAdapter(
 
     override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder {
         val rowView =
-            LayoutInflater.from(parent.context).inflate(R.layout.pending_row, parent, false)
+            LayoutInflater.from(parent.context).inflate(R.layout.list_item_pending_operation, parent, false)
         return MyViewHolder(rowView)
     }
 
diff --git a/wallet/src/main/java/net/taler/wallet/transactions/Transaction.kt b/wallet/src/main/java/net/taler/wallet/transactions/Transaction.kt
index 5fcabe7..c0142d5 100644
--- a/wallet/src/main/java/net/taler/wallet/transactions/Transaction.kt
+++ b/wallet/src/main/java/net/taler/wallet/transactions/Transaction.kt
@@ -18,7 +18,6 @@ package net.taler.wallet.transactions
 
 import androidx.annotation.DrawableRes
 import androidx.annotation.LayoutRes
-import androidx.annotation.StringRes
 import com.fasterxml.jackson.annotation.JsonIgnoreProperties
 import com.fasterxml.jackson.annotation.JsonInclude
 import com.fasterxml.jackson.annotation.JsonInclude.Include.NON_EMPTY
@@ -32,6 +31,7 @@ import com.fasterxml.jackson.annotation.JsonTypeName
 import net.taler.common.Amount
 import net.taler.common.Timestamp
 import net.taler.wallet.R
+import net.taler.wallet.cleanExchange
 import org.json.JSONObject
 
 enum class ReserveType {
@@ -93,6 +93,17 @@ class ReserveShortInfo(
     val reserveCreationDetail: ReserveCreationDetail
 )
 
+sealed class AmountType {
+    object Positive : AmountType()
+    object Negative : AmountType()
+    object Neutral : AmountType()
+}
+
+class DisplayAmount(
+    val amount: Amount,
+    val type: AmountType
+)
+
 typealias Transactions = ArrayList<Transaction>
 
 @JsonTypeInfo(
@@ -137,21 +148,20 @@ ReserveCreated = "reserve-created",
 abstract class Transaction(
     val timestamp: Timestamp,
     @get:LayoutRes
-    open val layout: Int = R.layout.transaction_row,
-    @get:LayoutRes
     open val detailPageLayout: Int = 0,
-    @get:StringRes
-    open val title: Int = 0,
     @get:DrawableRes
     open val icon: Int = R.drawable.ic_account_balance,
     open val showToUser: Boolean = false
 ) {
+    abstract val title: String?
     open lateinit var json: JSONObject
+    open val displayAmount: DisplayAmount? = null
+    open fun isCurrency(currency: String): Boolean = true
 }
 
 
 class UnknownTransaction(timestamp: Timestamp) : Transaction(timestamp) {
-    override val title = R.string.transaction_unknown
+    override val title: String? = null
 }
 
 @JsonTypeName("exchange-added")
@@ -160,7 +170,7 @@ class ExchangeAddedEvent(
     val exchangeBaseUrl: String,
     val builtIn: Boolean
 ) : Transaction(timestamp) {
-    override val title = R.string.history_event_exchange_added
+    override val title = cleanExchange(exchangeBaseUrl)
 }
 
 @JsonTypeName("exchange-updated")
@@ -168,7 +178,7 @@ class ExchangeUpdatedEvent(
     timestamp: Timestamp,
     val exchangeBaseUrl: String
 ) : Transaction(timestamp) {
-    override val title = R.string.history_event_exchange_updated
+    override val title = cleanExchange(exchangeBaseUrl)
 }
 
 
@@ -193,7 +203,9 @@ class ReserveBalanceUpdatedTransaction(
      */
     val reserveUnclaimedAmount: Amount
 ) : Transaction(timestamp) {
-    override val title = R.string.transaction_reserve_balance_updated
+    override val title: String? = null
+    override val displayAmount = DisplayAmount(reserveBalance, AmountType.Neutral)
+    override fun isCurrency(currency: String) = reserveBalance.currency == currency
 }
 
 @JsonTypeName("withdrawn")
@@ -219,11 +231,12 @@ class WithdrawTransaction(
      */
     val amountWithdrawnEffective: Amount
 ) : Transaction(timestamp) {
-    override val layout = R.layout.transaction_in
     override val detailPageLayout = R.layout.fragment_event_withdraw
-    override val title = R.string.transaction_withdrawal
+    override val title = cleanExchange(exchangeBaseUrl)
     override val icon = R.drawable.transaction_withdrawal
     override val showToUser = true
+    override val displayAmount = DisplayAmount(amountWithdrawnEffective, AmountType.Positive)
+    override fun isCurrency(currency: String) = amountWithdrawnRaw.currency == currency
 }
 
 @JsonTypeName("order-accepted")
@@ -235,7 +248,8 @@ class OrderAcceptedTransaction(
     val orderShortInfo: OrderShortInfo
 ) : Transaction(timestamp) {
     override val icon = R.drawable.ic_add_circle
-    override val title = R.string.transaction_order_accepted
+    override val title: String? = null
+    override fun isCurrency(currency: String) = orderShortInfo.amount.currency == currency
 }
 
 @JsonTypeName("order-refused")
@@ -247,7 +261,8 @@ class OrderRefusedTransaction(
     val orderShortInfo: OrderShortInfo
 ) : Transaction(timestamp) {
     override val icon = R.drawable.ic_cancel
-    override val title = R.string.transaction_order_refused
+    override val title: String? = null
+    override fun isCurrency(currency: String) = orderShortInfo.amount.currency == currency
 }
 
 @JsonTypeName("payment-sent")
@@ -275,11 +290,12 @@ class PaymentTransaction(
      */
     val sessionId: String?
 ) : Transaction(timestamp) {
-    override val layout = R.layout.transaction_out
     override val detailPageLayout = R.layout.fragment_event_paid
-    override val title = R.string.transaction_payment
+    override val title = orderShortInfo.summary
     override val icon = R.drawable.ic_cash_usd_outline
     override val showToUser = true
+    override val displayAmount = DisplayAmount(amountPaidWithFees, AmountType.Negative)
+    override fun isCurrency(currency: String) = orderShortInfo.amount.currency == currency
 }
 
 @JsonTypeName("payment-aborted")
@@ -294,10 +310,11 @@ class PaymentAbortedTransaction(
      */
     val amountLost: Amount
 ) : Transaction(timestamp) {
-    override val layout = R.layout.transaction_out
-    override val title = R.string.transaction_payment_aborted
+    override val title = orderShortInfo.summary
     override val icon = R.drawable.transaction_payment_aborted
     override val showToUser = true
+    override val displayAmount = DisplayAmount(amountLost, AmountType.Negative)
+    override fun isCurrency(currency: String) = orderShortInfo.amount.currency == currency
 }
 
 @JsonTypeName("refreshed")
@@ -325,10 +342,19 @@ class RefreshTransaction(
      */
     val refreshGroupId: String
 ) : Transaction(timestamp) {
-    override val layout = R.layout.transaction_out
     override val icon = R.drawable.transaction_refresh
-    override val title = R.string.transaction_refresh
+    override val title: String? = null
     override val showToUser = !(amountRefreshedRaw - amountRefreshedEffective).isZero()
+    override val displayAmount: DisplayAmount?
+        get() {
+            return if (showToUser) DisplayAmount(
+                amountRefreshedRaw - amountRefreshedEffective,
+                AmountType.Negative
+            )
+            else null
+        }
+
+    override fun isCurrency(currency: String) = amountRefreshedRaw.currency == currency
 }
 
 @JsonTypeName("order-redirected")
@@ -345,7 +371,8 @@ class OrderRedirectedTransaction(
     val alreadyPaidOrderShortInfo: OrderShortInfo
 ) : Transaction(timestamp) {
     override val icon = R.drawable.ic_directions
-    override val title = R.string.transaction_order_redirected
+    override val title = newOrderShortInfo.summary
+    override fun isCurrency(currency: String) = newOrderShortInfo.amount.currency == currency
 }
 
 @JsonTypeName("tip-accepted")
@@ -361,9 +388,10 @@ class TipAcceptedTransaction(
     val tipRaw: Amount
 ) : Transaction(timestamp) {
     override val icon = R.drawable.transaction_tip_accepted
-    override val title = R.string.transaction_tip_accepted
-    override val layout = R.layout.transaction_in
+    override val title: String? = null
     override val showToUser = true
+    override val displayAmount = DisplayAmount(tipRaw, AmountType.Positive)
+    override fun isCurrency(currency: String) = tipRaw.currency == currency
 }
 
 @JsonTypeName("tip-declined")
@@ -379,9 +407,10 @@ class TipDeclinedTransaction(
     val tipAmount: Amount
 ) : Transaction(timestamp) {
     override val icon = R.drawable.transaction_tip_declined
-    override val title = R.string.transaction_tip_declined
-    override val layout = R.layout.transaction_in
+    override val title: String? = null
     override val showToUser = true
+    override val displayAmount = DisplayAmount(tipAmount, AmountType.Neutral)
+    override fun isCurrency(currency: String) = tipAmount.currency == currency
 }
 
 @JsonTypeName("refund")
@@ -408,10 +437,11 @@ class RefundTransaction(
     val amountRefundedEffective: Amount
 ) : Transaction(timestamp) {
     override val icon = R.drawable.transaction_refund
-    override val title = R.string.transaction_refund
-    override val layout = R.layout.transaction_in
+    override val title = orderShortInfo.summary
     override val detailPageLayout = R.layout.fragment_event_paid
     override val showToUser = true
+    override val displayAmount = DisplayAmount(amountRefundedEffective, AmountType.Positive)
+    override fun isCurrency(currency: String) = amountRefundedRaw.currency == currency
 }
 
 @JsonTypeInfo(
diff --git a/wallet/src/main/java/net/taler/wallet/transactions/TransactionAdapter.kt b/wallet/src/main/java/net/taler/wallet/transactions/TransactionAdapter.kt
index beebcda..809f6a9 100644
--- a/wallet/src/main/java/net/taler/wallet/transactions/TransactionAdapter.kt
+++ b/wallet/src/main/java/net/taler/wallet/transactions/TransactionAdapter.kt
@@ -17,18 +17,19 @@
 package net.taler.wallet.transactions
 
 import android.content.Context
-import android.graphics.Paint.STRIKE_THRU_TEXT_FLAG
 import android.view.LayoutInflater
 import android.view.View
+import android.view.View.GONE
+import android.view.View.VISIBLE
 import android.view.ViewGroup
 import android.widget.ImageView
 import android.widget.TextView
 import androidx.annotation.CallSuper
 import androidx.recyclerview.widget.RecyclerView.Adapter
 import androidx.recyclerview.widget.RecyclerView.ViewHolder
+import net.taler.common.exhaustive
 import net.taler.common.toRelativeTime
 import net.taler.wallet.R
-import net.taler.wallet.cleanExchange
 import net.taler.wallet.transactions.TransactionAdapter.TransactionViewHolder
 
 
@@ -42,15 +43,10 @@ internal class TransactionAdapter(
         setHasStableIds(false)
     }
 
-    override fun getItemViewType(position: Int): Int = transactions[position].layout
-
     override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): TransactionViewHolder {
-        val view = LayoutInflater.from(parent.context).inflate(viewType, parent, false)
-        return when (viewType) {
-            R.layout.transaction_in -> TransactionInViewHolder(view)
-            R.layout.transaction_out -> TransactionOutViewHolder(view)
-            else -> GenericTransactionViewHolder(view)
-        }
+        val view = LayoutInflater.from(parent.context)
+            .inflate(R.layout.list_item_transaction, parent, false)
+        return TransactionViewHolder(view)
     }
 
     override fun getItemCount(): Int = transactions.size
@@ -65,122 +61,73 @@ internal class TransactionAdapter(
         this.notifyDataSetChanged()
     }
 
-    internal abstract inner class TransactionViewHolder(private val v: View) : ViewHolder(v) {
+    internal open inner class TransactionViewHolder(private val v: View) : ViewHolder(v) {
 
         protected val context: Context = v.context
+
         private val icon: ImageView = v.findViewById(R.id.icon)
         protected val title: TextView = v.findViewById(R.id.title)
         private val time: TextView = v.findViewById(R.id.time)
+        private val amount: TextView = v.findViewById(R.id.amount)
+
         private val selectableBackground = v.background
+        private val amountColor = amount.currentTextColor
 
         @CallSuper
-        open fun bind(event: Transaction) {
-            if (devMode || event.detailPageLayout != 0) {
+        open fun bind(transaction: Transaction) {
+            if (devMode || transaction.detailPageLayout != 0) {
                 v.background = selectableBackground
-                v.setOnClickListener { listener.onEventClicked(event) }
+                v.setOnClickListener { listener.onEventClicked(transaction) }
             } else {
                 v.background = null
                 v.setOnClickListener(null)
             }
-            icon.setImageResource(event.icon)
-            if (event.title == 0) title.text = event::class.java.simpleName
-            else title.setText(event.title)
-            time.text = event.timestamp.ms.toRelativeTime(context)
-        }
-
-    }
-
-    internal inner class GenericTransactionViewHolder(v: View) : TransactionViewHolder(v) {
-
-        private val info: TextView = v.findViewById(R.id.info)
-
-        override fun bind(transaction: Transaction) {
-            super.bind(transaction)
-            info.text = when (transaction) {
-                is ExchangeAddedEvent -> cleanExchange(transaction.exchangeBaseUrl)
-                is ExchangeUpdatedEvent -> cleanExchange(transaction.exchangeBaseUrl)
-                is ReserveBalanceUpdatedTransaction -> transaction.reserveBalance.toString()
-                is PaymentTransaction -> transaction.orderShortInfo.summary
-                is OrderAcceptedTransaction -> transaction.orderShortInfo.summary
-                is OrderRefusedTransaction -> transaction.orderShortInfo.summary
-                is OrderRedirectedTransaction -> transaction.newOrderShortInfo.summary
-                else -> ""
-            }
+            icon.setImageResource(transaction.icon)
+
+            title.text = if (transaction.title == null) {
+                when (transaction) {
+                    is RefreshTransaction -> getRefreshTitle(transaction)
+                    is OrderAcceptedTransaction -> context.getString(R.string.transaction_order_accepted)
+                    is OrderRefusedTransaction -> context.getString(R.string.transaction_order_refused)
+                    is TipAcceptedTransaction -> context.getString(R.string.transaction_tip_accepted)
+                    is TipDeclinedTransaction -> context.getString(R.string.transaction_tip_declined)
+                    is ReserveBalanceUpdatedTransaction -> context.getString(R.string.transaction_reserve_balance_updated)
+                    else -> transaction::class.java.simpleName
+                }
+            } else transaction.title
+
+            time.text = transaction.timestamp.ms.toRelativeTime(context)
+            bindAmount(transaction.displayAmount)
         }
 
-    }
-
-    internal inner class TransactionInViewHolder(v: View) : TransactionViewHolder(v) {
-
-        private val summary: TextView = v.findViewById(R.id.summary)
-        private val amountWithdrawn: TextView = v.findViewById(R.id.amountWithdrawn)
-        private val paintFlags = amountWithdrawn.paintFlags
-
-        override fun bind(event: Transaction) {
-            super.bind(event)
-            when (event) {
-                is WithdrawTransaction -> bind(event)
-                is RefundTransaction -> bind(event)
-                is TipAcceptedTransaction -> bind(event)
-                is TipDeclinedTransaction -> bind(event)
-            }
-        }
-
-        private fun bind(event: WithdrawTransaction) {
-            summary.text = cleanExchange(event.exchangeBaseUrl)
-            amountWithdrawn.text =
-                context.getString(R.string.amount_positive, event.amountWithdrawnEffective)
-            amountWithdrawn.paintFlags = paintFlags
-        }
-
-        private fun bind(event: RefundTransaction) {
-            summary.text = event.orderShortInfo.summary
-            amountWithdrawn.text =
-                context.getString(R.string.amount_positive, event.amountRefundedEffective)
-            amountWithdrawn.paintFlags = paintFlags
-        }
-
-        private fun bind(transaction: TipAcceptedTransaction) {
-            summary.text = null
-            amountWithdrawn.text = context.getString(R.string.amount_positive, transaction.tipRaw)
-            amountWithdrawn.paintFlags = paintFlags
-        }
-
-        private fun bind(transaction: TipDeclinedTransaction) {
-            summary.text = null
-            amountWithdrawn.text = context.getString(R.string.amount_positive, transaction.tipAmount)
-            amountWithdrawn.paintFlags = amountWithdrawn.paintFlags or STRIKE_THRU_TEXT_FLAG
-        }
-
-    }
-
-    internal inner class TransactionOutViewHolder(v: View) : TransactionViewHolder(v) {
-
-        private val summary: TextView = v.findViewById(R.id.summary)
-        private val amountPaidWithFees: TextView = v.findViewById(R.id.amountPaidWithFees)
-
-        override fun bind(event: Transaction) {
-            super.bind(event)
-            when (event) {
-                is PaymentTransaction -> bind(event)
-                is PaymentAbortedTransaction -> bind(event)
-                is RefreshTransaction -> bind(event)
+        private fun bindAmount(displayAmount: DisplayAmount?) {
+            if (displayAmount == null) {
+                amount.visibility = GONE
+            } else {
+                amount.visibility = VISIBLE
+                when (displayAmount.type) {
+                    AmountType.Positive -> {
+                        amount.text = context.getString(
+                            R.string.amount_positive, displayAmount.amount.amountStr
+                        )
+                        amount.setTextColor(context.getColor(R.color.green))
+                    }
+                    AmountType.Negative -> {
+                        amount.text = context.getString(
+                            R.string.amount_negative, displayAmount.amount.amountStr
+                        )
+                        amount.setTextColor(context.getColor(R.color.red))
+                    }
+                    AmountType.Neutral -> {
+                        amount.text = displayAmount.amount.amountStr
+                        amount.setTextColor(amountColor)
+                    }
+                }.exhaustive
             }
         }
 
-        private fun bind(event: PaymentTransaction) {
-            summary.text = event.orderShortInfo.summary
-            amountPaidWithFees.text =
-                context.getString(R.string.amount_negative, event.amountPaidWithFees)
-        }
-
-        private fun bind(transaction: PaymentAbortedTransaction) {
-            summary.text = transaction.orderShortInfo.summary
-            amountPaidWithFees.text = context.getString(R.string.amount_negative, transaction.amountLost)
-        }
-
-        private fun bind(event: RefreshTransaction) {
-            val res = when (event.refreshReason) {
+        private fun getRefreshTitle(transaction: RefreshTransaction): String {
+            val res = when (transaction.refreshReason) {
                 RefreshReason.MANUAL -> R.string.transaction_refresh_reason_manual
                 RefreshReason.PAY -> R.string.transaction_refresh_reason_pay
                 RefreshReason.REFUND -> R.string.transaction_refresh_reason_refund
@@ -188,10 +135,7 @@ internal class TransactionAdapter(
                 RefreshReason.RECOUP -> R.string.transaction_refresh_reason_recoup
                 RefreshReason.BACKUP_RESTORED -> R.string.transaction_refresh_reason_backup_restored
             }
-            summary.text = context.getString(res)
-            val fee = event.amountRefreshedRaw - event.amountRefreshedEffective
-            if (fee.isZero()) amountPaidWithFees.text = null
-            else amountPaidWithFees.text = context.getString(R.string.amount_negative, fee)
+            return context.getString(R.string.transaction_refresh) + " " + context.getString(res)
         }
 
     }
diff --git a/wallet/src/main/java/net/taler/wallet/transactions/TransactionDetailFragment.kt b/wallet/src/main/java/net/taler/wallet/transactions/TransactionDetailFragment.kt
index f198215..909a7bf 100644
--- a/wallet/src/main/java/net/taler/wallet/transactions/TransactionDetailFragment.kt
+++ b/wallet/src/main/java/net/taler/wallet/transactions/TransactionDetailFragment.kt
@@ -59,7 +59,7 @@ class TransactionDetailFragment : Fragment() {
     override fun onActivityCreated(savedInstanceState: Bundle?) {
         super.onActivityCreated(savedInstanceState)
         requireActivity().title =
-            getString(if (event.title != 0) event.title else R.string.transactions_detail_title)
+            if (event.title != null) event.title else getString(R.string.transactions_detail_title)
     }
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
diff --git a/wallet/src/main/java/net/taler/wallet/transactions/TransactionManager.kt b/wallet/src/main/java/net/taler/wallet/transactions/TransactionManager.kt
index c4ab785..549b2a8 100644
--- a/wallet/src/main/java/net/taler/wallet/transactions/TransactionManager.kt
+++ b/wallet/src/main/java/net/taler/wallet/transactions/TransactionManager.kt
@@ -46,6 +46,7 @@ class TransactionManager(
 
     val showAll = MutableLiveData<Boolean>()
 
+    var selectedCurrency: String? = null
     var selectedEvent: Transaction? = null
 
     val transactions: LiveData<TransactionsResult> = showAll.switchMap { showAll ->
@@ -65,10 +66,13 @@ class TransactionManager(
                 }
                 val transactions = Transactions()
                 val json = result.getJSONArray("history")
+                val currency = selectedCurrency
                 for (i in 0 until json.length()) {
                     val event: Transaction = mapper.readValue(json.getString(i))
                     event.json = json.getJSONObject(i)
-                    transactions.add(event)
+                    if (currency == null || event.isCurrency(currency)) {
+                        transactions.add(event)
+                    }
                 }
                 transactions.reverse()  // show latest first
                 val filtered =
diff --git a/wallet/src/main/java/net/taler/wallet/transactions/TransactionsFragment.kt b/wallet/src/main/java/net/taler/wallet/transactions/TransactionsFragment.kt
index 663a5aa..4f62547 100644
--- a/wallet/src/main/java/net/taler/wallet/transactions/TransactionsFragment.kt
+++ b/wallet/src/main/java/net/taler/wallet/transactions/TransactionsFragment.kt
@@ -47,6 +47,7 @@ class TransactionsFragment : Fragment(), OnEventClickListener {
     private val model: MainViewModel by activityViewModels()
     private val transactionManager by lazy { model.transactionManager }
     private val transactionAdapter by lazy { TransactionAdapter(model.devMode.value == true, this) }
+    private val currency by lazy { transactionManager.selectedCurrency!! }
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -78,6 +79,16 @@ class TransactionsFragment : Fragment(), OnEventClickListener {
         if (savedInstanceState == null) transactionManager.showAll.value = model.devMode.value
     }
 
+    override fun onActivityCreated(savedInstanceState: Bundle?) {
+        super.onActivityCreated(savedInstanceState)
+        model.balances.observe(viewLifecycleOwner, Observer { balances ->
+            balances[currency]?.available?.let { amount ->
+                requireActivity().title =
+                    getString(R.string.transactions_detail_title_balance, amount)
+            }
+        })
+    }
+
     override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
         inflater.inflate(R.menu.transactions, menu)
     }