add usd equivalent balance to overview page

app/src/main/java/com/dcrandroid/HomeActivity.kt

@@ -282,6 +282,11 @@ class HomeActivity : BaseActivity(), SyncProgressListener, TxAndBlockNotificatio
 
         showOrHideFab(position)
 
+        // Hide title bar usd balance if not OverviewFragment
+        if (position > 0) {
+            toolbar_subtitle.visibility = View.GONE
+        }
+
         adapter.changeActiveTab(position)
     }
 
@@ -294,6 +299,15 @@ class HomeActivity : BaseActivity(), SyncProgressListener, TxAndBlockNotificatio
         }
     }
 
+    fun setToolbarSubTitle(subtitle: CharSequence) {
+        if (subtitle == "") {
+            toolbar_subtitle.visibility = View.GONE
+        } else {
+            toolbar_subtitle.visibility = View.VISIBLE
+            toolbar_subtitle.text = subtitle
+        }
+    }
+
     fun checkWifiSync() {
         if (!multiWallet!!.readBoolConfigValueForKey(Dcrlibwallet.SyncOnCellularConfigKey, Constants.DEF_SYNC_ON_CELLULAR)) {
             // Check if wifi is connected

app/src/main/java/com/dcrandroid/dialog/send/AmountInputHelper.kt

@@ -20,6 +20,7 @@ import com.dcrandroid.extensions.hide
 import com.dcrandroid.extensions.show
 import com.dcrandroid.extensions.toggleVisibility
 import com.dcrandroid.util.CoinFormat
+import com.dcrandroid.util.CurrencyUtil
 import com.dcrandroid.util.GetExchangeRate
 import com.dcrandroid.util.WalletData
 import dcrlibwallet.Dcrlibwallet
@@ -29,12 +30,10 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.launch
 import java.math.BigDecimal
-import java.math.RoundingMode
 import java.text.DecimalFormat
 
 
 const val AmountRelativeSize = 0.625f
-val usdAmountFormat: DecimalFormat = DecimalFormat("0.0000")
 val usdAmountFormat2: DecimalFormat = DecimalFormat("0.00")
 val dcrFormat = DecimalFormat("#.########")
 
@@ -194,7 +193,7 @@ class AmountInputHelper(private val layout: LinearLayout, private val scrollToBo
             layout.send_amount.removeTextChangedListener(this)
 
             dcrAmount = BigDecimal(coin)
-            usdAmount = dcrToUSD(exchangeDecimal, dcrAmount!!.toDouble())
+            usdAmount = CurrencyUtil.dcrToUSD(exchangeDecimal, dcrAmount!!.toDouble())
 
             if (currencyIsDCR) {
                 val dcr = Dcrlibwallet.amountAtom(coin)
@@ -252,10 +251,10 @@ class AmountInputHelper(private val layout: LinearLayout, private val scrollToBo
         if (enteredAmount != null) {
             if (currencyIsDCR) {
                 dcrAmount = enteredAmount!!
-                usdAmount = dcrToUSD(exchangeDecimal, dcrAmount!!.toDouble())
+                usdAmount = CurrencyUtil.dcrToUSD(exchangeDecimal, dcrAmount!!.toDouble())
             } else {
                 usdAmount = enteredAmount!!
-                dcrAmount = usdToDCR(exchangeDecimal, usdAmount!!.toDouble())
+                dcrAmount = CurrencyUtil.usdToDCR(exchangeDecimal, usdAmount!!.toDouble())
             }
         } else {
             dcrAmount = null
@@ -312,7 +311,7 @@ class AmountInputHelper(private val layout: LinearLayout, private val scrollToBo
         }
 
         if (dcrAmount != null) {
-            usdAmount = dcrToUSD(exchangeDecimal, dcrAmount!!.toDouble())
+            usdAmount = CurrencyUtil.dcrToUSD(exchangeDecimal, dcrAmount!!.toDouble())
         }
 
         displayEquivalentValue()
@@ -329,29 +328,4 @@ class AmountInputHelper(private val layout: LinearLayout, private val scrollToBo
             layout.exchange_layout.show()
         }
     }
-}
-
-fun dcrToFormattedUSD(exchangeDecimal: BigDecimal?, dcr: Double, scale: Int = 4): String {
-    if (scale == 4) {
-        return usdAmountFormat.format(
-                dcrToUSD(exchangeDecimal, dcr)!!.setScale(scale, BigDecimal.ROUND_HALF_EVEN).toDouble())
-    }
-
-    return usdAmountFormat2.format(
-            dcrToUSD(exchangeDecimal, dcr)!!.setScale(scale, BigDecimal.ROUND_HALF_EVEN).toDouble())
-}
-
-fun dcrToUSD(exchangeDecimal: BigDecimal?, dcr: Double): BigDecimal? {
-    val dcrDecimal = BigDecimal(dcr)
-    return exchangeDecimal?.multiply(dcrDecimal)
-}
-
-fun usdToDCR(exchangeDecimal: BigDecimal?, usd: Double): BigDecimal? {
-    if (exchangeDecimal == null) {
-        return null
-    }
-
-    val usdDecimal = BigDecimal(usd)
-    // using 8 to be safe
-    return usdDecimal.divide(exchangeDecimal, 8, RoundingMode.HALF_EVEN)
 }

app/src/main/java/com/dcrandroid/dialog/send/ConfirmTransaction.kt

@@ -21,10 +21,7 @@ import com.dcrandroid.dialog.PasswordPromptDialog
 import com.dcrandroid.dialog.PinPromptDialog
 import com.dcrandroid.extensions.hide
 import com.dcrandroid.extensions.show
-import com.dcrandroid.util.CoinFormat
-import com.dcrandroid.util.PassPromptTitle
-import com.dcrandroid.util.PassPromptUtil
-import com.dcrandroid.util.Utils
+import com.dcrandroid.util.*
 import dcrlibwallet.Dcrlibwallet
 import dcrlibwallet.Wallet
 import kotlinx.android.synthetic.main.confirm_send_sheet.*
@@ -61,7 +58,7 @@ class ConfirmTransaction(private val fragmentActivity: FragmentActivity, val sen
 
         val dcrAmount = CoinFormat.formatDecred(Dcrlibwallet.amountAtom(transactionData.dcrAmount.toDouble()))
         val amountStr = if (transactionData.exchangeDecimal != null) {
-            val usdAmount = dcrToFormattedUSD(transactionData.exchangeDecimal, transactionData.dcrAmount.toDouble(), 2)
+            val usdAmount = CurrencyUtil.dcrToFormattedUSD(transactionData.exchangeDecimal, transactionData.dcrAmount.toDouble(), 2)
             HtmlCompat.fromHtml(getString(R.string.x_dcr_usd, dcrAmount, usdAmount), 0)
         } else {
             getString(R.string.x_dcr, dcrAmount)

app/src/main/java/com/dcrandroid/dialog/send/SendDialog.kt

@@ -30,6 +30,7 @@ import com.dcrandroid.dialog.InfoDialog
 import com.dcrandroid.extensions.hide
 import com.dcrandroid.extensions.show
 import com.dcrandroid.util.CoinFormat
+import com.dcrandroid.util.CurrencyUtil
 import com.dcrandroid.util.SnackBar
 import com.dcrandroid.util.Utils
 import com.dcrandroid.view.util.AccountCustomSpinner
@@ -405,8 +406,8 @@ class SendDialog(val fragmentActivity: FragmentActivity, dismissListener: Dialog
             val feeCoin = Dcrlibwallet.amountCoin(feeAtom)
             val totalCostCoin = Dcrlibwallet.amountCoin(totalCostAtom)
 
-            val feeUSD = dcrToFormattedUSD(amountHelper.exchangeDecimal, feeCoin)
-            val totalCostUSD = dcrToFormattedUSD(amountHelper.exchangeDecimal, totalCostCoin, 2)
+            val feeUSD = CurrencyUtil.dcrToFormattedUSD(amountHelper.exchangeDecimal, feeCoin)
+            val totalCostUSD = CurrencyUtil.dcrToFormattedUSD(amountHelper.exchangeDecimal, totalCostCoin, 2)
 
             feeSpanned = HtmlCompat.fromHtml(getString(R.string.x_dcr_usd, feeString, feeUSD), 0)
             totalCostSpanned = HtmlCompat.fromHtml(getString(R.string.x_dcr_usd, totalCostString, totalCostUSD), 0)

app/src/main/java/com/dcrandroid/fragments/BaseFragment.kt

@@ -66,6 +66,13 @@ open class BaseFragment : Fragment(), SyncProgressListener, TxAndBlockNotificati
         }
     }
 
+    fun setToolbarSubTitle(subtitle: CharSequence) {
+        if (activity is HomeActivity) {
+            val homeActivity = activity as HomeActivity
+            homeActivity.setToolbarSubTitle(subtitle)
+        }
+    }
+
     fun refreshNavigationTabs() {
         if (activity is HomeActivity) {
             val homeActivity = activity as HomeActivity

app/src/main/java/com/dcrandroid/fragments/OverviewFragment.kt

@@ -14,6 +14,7 @@ import android.view.ViewGroup
 import android.view.ViewTreeObserver
 import android.widget.LinearLayout
 import android.widget.TextView
+import androidx.core.text.HtmlCompat
 import androidx.core.widget.NestedScrollView
 import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
@@ -24,10 +25,7 @@ import com.dcrandroid.data.Constants
 import com.dcrandroid.data.Transaction
 import com.dcrandroid.dialog.InfoDialog
 import com.dcrandroid.extensions.*
-import com.dcrandroid.util.CoinFormat
-import com.dcrandroid.util.Deserializer
-import com.dcrandroid.util.SnackBar
-import com.dcrandroid.util.SyncLayoutUtil
+import com.dcrandroid.util.*
 import com.google.gson.GsonBuilder
 import dcrlibwallet.AccountMixerNotificationListener
 import dcrlibwallet.Dcrlibwallet
@@ -40,10 +38,11 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
+import java.math.BigDecimal
 
 const val MAX_TRANSACTIONS = 3
 
-class OverviewFragment : BaseFragment(), ViewTreeObserver.OnScrollChangedListener, AccountMixerNotificationListener {
+class OverviewFragment : BaseFragment(), ViewTreeObserver.OnScrollChangedListener, AccountMixerNotificationListener, GetExchangeRate.ExchangeRateCallback {
 
     companion object {
         private var closedBackupWarning = false
@@ -65,9 +64,12 @@ class OverviewFragment : BaseFragment(), ViewTreeObserver.OnScrollChangedListene
     private lateinit var recyclerView: RecyclerView
 
     private lateinit var balanceTextView: TextView
+    private lateinit var usdBalanceTextView: TextView
     internal lateinit var noTransactionsTextView: TextView
     internal lateinit var transactionsLayout: LinearLayout
 
+    var exchangeDecimal: BigDecimal? = null
+
     private lateinit var syncLayout: LinearLayout
     private var syncLayoutUtil: SyncLayoutUtil? = null
 
@@ -80,6 +82,7 @@ class OverviewFragment : BaseFragment(), ViewTreeObserver.OnScrollChangedListene
         recyclerView = view.findViewById(R.id.rv_transactions)
 
         balanceTextView = view.findViewById(R.id.tv_visible_wallet_balance)
+        usdBalanceTextView = view.findViewById(R.id.tv_visible_usd_wallet_balance)
         noTransactionsTextView = view.findViewById(R.id.tv_no_transactions)
         transactionsLayout = view.findViewById(R.id.transactions_view)
 
@@ -147,6 +150,8 @@ class OverviewFragment : BaseFragment(), ViewTreeObserver.OnScrollChangedListene
         mixer_status_rv.adapter = MixerStatusAdapter()
         setMixerStatus()
         multiWallet?.setAccountMixerNotification(this)
+
+        fetchExchangeRate()
     }
 
     private fun setMixerStatus() = GlobalScope.launch(Dispatchers.Main) {
@@ -206,17 +211,32 @@ class OverviewFragment : BaseFragment(), ViewTreeObserver.OnScrollChangedListene
     }
 
     override fun onScrollChanged() {
+        val totalBalanceAtom = multiWallet!!.totalWalletBalance()
+        val totalBalanceCoin = Dcrlibwallet.amountCoin(totalBalanceAtom)
+
         if (mainBalanceIsVisible()) {
             setToolbarTitle(CoinFormat.format(multiWallet!!.totalWalletBalance(), 0.7f), true)
+            if (exchangeDecimal != null) {
+                val formattedUSD = HtmlCompat.fromHtml(getString(R.string.usd_symbol_format, CurrencyUtil.dcrToFormattedUSD(exchangeDecimal, totalBalanceCoin, 2)), 0)
+                setToolbarSubTitle(formattedUSD)
+            }
         } else {
             setToolbarTitle(R.string.overview, false)
+            setToolbarSubTitle("")
         }
     }
 
     private fun loadBalance() = GlobalScope.launch(Dispatchers.Main) {
         balanceTextView.text = CoinFormat.format(multiWallet!!.totalWalletBalance(), 0.5f)
+        val totalBalanceAtom = multiWallet!!.totalWalletBalance()
+        val totalBalanceCoin = Dcrlibwallet.amountCoin(totalBalanceAtom)
+
         if (mainBalanceIsVisible()) {
             setToolbarTitle(CoinFormat.format(multiWallet!!.totalWalletBalance(), 0.7f), true)
+            if (exchangeDecimal != null) {
+                val formattedUSD = HtmlCompat.fromHtml(getString(R.string.usd_symbol_format, CurrencyUtil.dcrToFormattedUSD(exchangeDecimal, totalBalanceCoin, 2)), 0)
+                setToolbarSubTitle(formattedUSD)
+            }
         }
     }
 
@@ -323,6 +343,43 @@ class OverviewFragment : BaseFragment(), ViewTreeObserver.OnScrollChangedListene
     override fun onAccountMixerStarted(walletID: Long) {
         setMixerStatus()
     }
+
+    private fun isExchangeEnabled(): Boolean {
+        val currencyConversion = multiWallet!!.readInt32ConfigValueForKey(Dcrlibwallet.CurrencyConversionConfigKey, Constants.DEF_CURRENCY_CONVERSION)
+
+        return currencyConversion > 0
+    }
+
+    private fun fetchExchangeRate() {
+        if (!isExchangeEnabled()) {
+            return
+        }
+
+        println("Getting exchange rate")
+        val userAgent = multiWallet!!.readStringConfigValueForKey(Dcrlibwallet.UserAgentConfigKey)
+        GetExchangeRate(userAgent, this).execute()
+    }
+
+    override fun onExchangeRateSuccess(rate: GetExchangeRate.BittrexRateParser) {
+        exchangeDecimal = rate.usdRate
+
+        val totalBalanceAtom = multiWallet!!.totalWalletBalance()
+        val totalBalanceCoin = Dcrlibwallet.amountCoin(totalBalanceAtom)
+        val formattedUSD = HtmlCompat.fromHtml(getString(R.string.usd_symbol_format, CurrencyUtil.dcrToFormattedUSD(exchangeDecimal, totalBalanceCoin, 2)), 0)
+
+        GlobalScope.launch(Dispatchers.Main) {
+            usdBalanceTextView.text = formattedUSD
+            usdBalanceTextView.show()
+        }
+    }
+
+    override fun onExchangeRateError(e: Exception) {
+        e.printStackTrace()
+
+        GlobalScope.launch(Dispatchers.Main) {
+            usdBalanceTextView.hide()
+        }
+    }
 }
 
 fun OverviewFragment.showTransactionList() = GlobalScope.launch(Dispatchers.Main) {

app/src/main/java/com/dcrandroid/util/CurrencyUtil.kt

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2018-2019 The Decred developers
+ * Use of this source code is governed by an ISC
+ * license that can be found in the LICENSE file.
+ */
+
+package com.dcrandroid.util
+
+import java.math.BigDecimal
+import java.math.RoundingMode
+import java.text.DecimalFormat
+
+val usdAmountFormat: DecimalFormat = DecimalFormat("###,###,###,###,###.####")
+val usdAmountFormat2: DecimalFormat = DecimalFormat("###,###,###,###,###.##")
+
+object CurrencyUtil {
+    fun dcrToFormattedUSD(exchangeDecimal: BigDecimal?, dcr: Double, scale: Int = 4): String {
+        if (scale == 4) {
+            return usdAmountFormat.format(
+                    dcrToUSD(exchangeDecimal, dcr)!!.setScale(scale, BigDecimal.ROUND_HALF_EVEN).toDouble())
+        }
+        return usdAmountFormat2.format(
+                dcrToUSD(exchangeDecimal, dcr)!!.setScale(scale, BigDecimal.ROUND_HALF_EVEN).toDouble())
+    }
+
+    fun dcrToUSD(exchangeDecimal: BigDecimal?, dcr: Double): BigDecimal? {
+        val dcrDecimal = BigDecimal(dcr)
+        return exchangeDecimal?.multiply(dcrDecimal)
+    }
+
+    fun usdToDCR(exchangeDecimal: BigDecimal?, usd: Double): BigDecimal? {
+        if (exchangeDecimal == null) {
+            return null
+        }
+
+        val usdDecimal = BigDecimal(usd)
+        // using 8 to be safe
+        return usdDecimal.divide(exchangeDecimal, 8, RoundingMode.HALF_EVEN)
+    }
+}

app/src/main/res/drawable/light_grey_border_8dp.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle" >
+    <corners android:radius="8dp"/>
+    <stroke android:width="0.5dp" android:color="#C4CBD2"/>
+</shape>

app/src/main/res/layout/activity_tabs.xml

@@ -1,5 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
+<?xml version="1.0" encoding="utf-8"?><!--
   ~ Copyright (c) 2018-2019 The Decred developers
   ~ Use of this source code is governed by an ISC
   ~ license that can be found in the LICENSE file.
@@ -55,6 +54,22 @@
                     app:fontFamily="@font/source_sans_pro"
                     android:layout_marginStart="16dp" />
 
+                <TextView
+                    android:id="@+id/toolbar_subtitle"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:includeFontPadding="false"
+                    android:background="@drawable/light_grey_border_8dp"
+                    android:textColor="#3D5873"
+                    android:paddingTop="@dimen/margin_padding_size_4"
+                    android:paddingBottom="@dimen/margin_padding_size_4"
+                    android:paddingStart="@dimen/margin_padding_size_6"
+                    android:paddingEnd="@dimen/margin_padding_size_6"
+                    android:layout_marginStart="@dimen/margin_padding_size_8"
+                    android:textSize="@dimen/edit_text_size_14"
+                    android:visibility="gone"
+                    app:fontFamily="@font/source_sans_pro" />
+
             </LinearLayout>
 
         </androidx.appcompat.widget.Toolbar>