use yadio for pricing "exotic" fiat (#921)

* yadio api

* add more currencies

* fix es typo

* bump version & fix cicleci build

.circleci/config.yml

@@ -3,7 +3,7 @@ jobs:
   build:
     working_directory: ~/code
     docker:
-      - image: cimg/android:2022.03-ndk
+      - image: cimg/android:2023.12-ndk
     environment:
       JVM_OPTS: -Xmx3200m
     steps:

app/build.gradle

@@ -1,15 +1,15 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 33
-    buildToolsVersion '33.0.2'
     ndkVersion '17.2.4988734'
     defaultConfig {
         applicationId "com.m2049r.xmrwallet"
+        buildToolsVersion = '34.0.0'
+        compileSdk 33
         minSdkVersion 21
-        targetSdkVersion 31
-        versionCode 3307
-        versionName "3.3.7 'Pocket Change'"
+        targetSdkVersion 33
+        versionCode 3310
+        versionName "3.3.10 'Argentina'"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         externalNativeBuild {
             cmake {
@@ -126,11 +126,11 @@ dependencies {
     implementation 'androidx.core:core:1.10.1'
     implementation 'androidx.appcompat:appcompat:1.6.1'
     implementation 'androidx.legacy:legacy-support-v4:1.0.0'
-    implementation 'androidx.recyclerview:recyclerview:1.3.0'
+    implementation 'androidx.recyclerview:recyclerview:1.3.1'
     implementation 'androidx.cardview:cardview:1.0.0'
     implementation 'androidx.swiperefreshlayout:swiperefreshlayout:1.1.0'
     implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
-    implementation 'androidx.preference:preference:1.2.0'
+    implementation 'androidx.preference:preference:1.2.1'
 
     implementation 'com.google.android.material:material:1.9.0'
 

app/src/main/AndroidManifest.xml

@@ -1,6 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
 
+    <uses-feature
+        android:name="android.hardware.camera"
+        android:required="false" />
+
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.USE_FINGERPRINT" />

app/src/main/java/com/m2049r/xmrwallet/WalletActivity.java

@@ -629,7 +629,6 @@ public class WalletActivity extends BaseActivity implements WalletFragment.Liste
 
     @Override
     public void onWalletStarted(final Wallet.Status walletStatus) {
-        loadPocketChangeSettings();
         runOnUiThread(() -> {
             dismissProgressDialog();
             if (walletStatus == null) {
@@ -648,6 +647,8 @@ public class WalletActivity extends BaseActivity implements WalletFragment.Liste
             haveWallet = true;
             invalidateOptionsMenu();
 
+            loadPocketChangeSettings();
+
             if (requestStreetMode) onEnableStreetMode();
 
             final WalletFragment walletFragment = getWalletFragment();

app/src/main/java/com/m2049r/xmrwallet/XmrWalletApplication.java

@@ -22,18 +22,24 @@ import android.content.res.Configuration;
 import android.os.Build;
 
 import androidx.annotation.NonNull;
+import androidx.annotation.OptIn;
 import androidx.fragment.app.FragmentManager;
+import androidx.fragment.app.FragmentStateManagerControl;
 
 import com.m2049r.xmrwallet.model.NetworkType;
 import com.m2049r.xmrwallet.util.LocaleHelper;
 import com.m2049r.xmrwallet.util.NetCipherHelper;
 import com.m2049r.xmrwallet.util.NightmodeHelper;
+import com.m2049r.xmrwallet.util.ServiceHelper;
+
+import java.util.Arrays;
 
 import timber.log.Timber;
 
 public class XmrWalletApplication extends Application {
 
     @Override
+    @OptIn(markerClass = FragmentStateManagerControl.class)
     public void onCreate() {
         super.onCreate();
         FragmentManager.enableNewStateManager(false);

app/src/main/java/com/m2049r/xmrwallet/data/TxData.java

@@ -26,6 +26,7 @@ import com.m2049r.xmrwallet.model.Wallet;
 import java.util.ArrayList;
 import java.util.HashSet;
 import java.util.List;
+import java.util.Random;
 import java.util.Set;
 
 import lombok.Data;
@@ -136,8 +137,9 @@ public class TxData implements Parcelable {
     //////////////////////////
 
     final static public int POCKETCHANGE_IDX = 1; // subaddress index of first pocketchange slot
-    final static public int POCKETCHANGE_SLOTS = 10; // number of pocketchange slots
-    final static public int POCKETCHANGE_IDX_MAX = POCKETCHANGE_IDX + POCKETCHANGE_SLOTS - 1;
+    final static public int POCKETCHANGE_SLOTS_MIN = 6;  // min number of pocketchange slots
+    final static public int POCKETCHANGE_SLOTS_MAX = 14; // max number of pocketchange slots
+    final static public int POCKETCHANGE_IDX_MAX = POCKETCHANGE_IDX + POCKETCHANGE_SLOTS_MAX - 1;
 
     @Data
     static private class PocketChangeSlot {
@@ -171,8 +173,8 @@ public class TxData implements Parcelable {
         List<CoinsInfo> coins = wallet.getCoinsInfos(true);
         Set<Integer> spendableSubaddressIdx = new HashSet<>();
         PocketChangeSlot reserves = new PocketChangeSlot(); // everything not in a slot spendable
-        PocketChangeSlot[] slots = new PocketChangeSlot[POCKETCHANGE_SLOTS];
-        for (int i = 0; i < POCKETCHANGE_SLOTS; i++) {
+        PocketChangeSlot[] slots = new PocketChangeSlot[POCKETCHANGE_SLOTS_MAX];
+        for (int i = 0; i < POCKETCHANGE_SLOTS_MAX; i++) {
             slots[i] = new PocketChangeSlot();
         }
         for (CoinsInfo coin : coins) {
@@ -205,7 +207,8 @@ public class TxData implements Parcelable {
         // find any slots to fill if possible:
         List<Integer> slotsToFill = new ArrayList<>();
         List<Long> slotToFillAmounts = new ArrayList<>();
-        for (int i = 0; i < POCKETCHANGE_SLOTS; i++) {
+        final int randomSlotCount = new Random().nextInt(POCKETCHANGE_SLOTS_MAX - POCKETCHANGE_SLOTS_MIN + 1) + POCKETCHANGE_SLOTS_MIN;
+        for (int i = 0; i < randomSlotCount; i++) {
             if (slots[i].getAmount() < pocketChangeAmount) {
                 final long topupAmount = pocketChangeAmount - slots[i].getAmount();
                 if (topupAmount <= spendableAmount) {

app/src/main/java/com/m2049r/xmrwallet/fragment/send/SendBtcConfirmWizardFragment.java

@@ -74,6 +74,9 @@ public class SendBtcConfirmWizardFragment extends SendWizardFragment implements
     private View llConfirmSend;
     private Button bSend;
     private View pbProgressSend;
+    private TextView tvTxChange;
+    private View llPocketChange;
+
 
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
@@ -92,6 +95,8 @@ public class SendBtcConfirmWizardFragment extends SendWizardFragment implements
 
         tvTxFee = view.findViewById(R.id.tvTxFee);
         tvTxTotal = view.findViewById(R.id.tvTxTotal);
+        tvTxChange = view.findViewById(R.id.tvTxChange);
+        llPocketChange = view.findViewById(R.id.llPocketChange);
 
         llStageA = view.findViewById(R.id.llStageA);
         evStageA = view.findViewById(R.id.evStageA);
@@ -217,6 +222,13 @@ public class SendBtcConfirmWizardFragment extends SendWizardFragment implements
                 tvTxFee.setText(Wallet.getDisplayAmount(pendingTransaction.getFee()));
                 tvTxTotal.setText(Wallet.getDisplayAmount(
                         pendingTransaction.getFee() + pendingTransaction.getAmount()));
+                final long change = pendingTransaction.getPocketChange();
+                if (change > 0) {
+                    llPocketChange.setVisibility(View.VISIBLE);
+                    tvTxChange.setText(Wallet.getDisplayAmount(change));
+                } else {
+                    llPocketChange.setVisibility(View.GONE);
+                }
                 updateSendButton();
             });
         } else {

app/src/main/java/com/m2049r/xmrwallet/service/exchange/api/ExchangeApi.java

@@ -33,5 +33,6 @@ public interface ExchangeApi {
     void queryExchangeRate(@NonNull final String baseCurrency, @NonNull final String quoteCurrency,
                            @NonNull final ExchangeCallback callback);
 
+    String getName();
 }
 

app/src/main/java/com/m2049r/xmrwallet/service/exchange/ecb/ExchangeApiImpl.java

@@ -67,9 +67,9 @@ public class ExchangeApiImpl implements ExchangeApi {
         // data is daily and is refreshed around 16:00 CET every working day
     }
 
-    public static boolean isSameDay(Calendar calendar, Calendar anotherCalendar) {
-        return (calendar.get(Calendar.YEAR) == anotherCalendar.get(Calendar.YEAR)) &&
-                (calendar.get(Calendar.DAY_OF_YEAR) == anotherCalendar.get(Calendar.DAY_OF_YEAR));
+    @Override
+    public String getName() {
+        return "ecb";
     }
 
     @Override
@@ -121,12 +121,12 @@ public class ExchangeApiImpl implements ExchangeApi {
         final NetCipherHelper.Request httpRequest = new NetCipherHelper.Request(baseUrl);
         httpRequest.enqueue(new okhttp3.Callback() {
             @Override
-            public void onFailure(final Call call, final IOException ex) {
+            public void onFailure(@NonNull final Call call, @NonNull final IOException ex) {
                 callback.onError(ex);
             }
 
             @Override
-            public void onResponse(final Call call, final Response response) throws IOException {
+            public void onResponse(@NonNull final Call call, @NonNull final Response response) throws IOException {
                 if (response.isSuccessful()) {
                     try {
                         DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
@@ -178,11 +178,12 @@ public class ExchangeApiImpl implements ExchangeApi {
                     Element cube = (Element) node;
                     if (cube.hasAttribute("time")) { // a time Cube
                         final Date time = DATE_FORMAT.parse(cube.getAttribute("time"));
+                        assert time != null;
                         date.setTime(time);
                     } else if (cube.hasAttribute("currency")
                             && cube.hasAttribute("rate")) { // a rate Cube
                         String currency = cube.getAttribute("currency");
-                        double rate = Double.valueOf(cube.getAttribute("rate"));
+                        double rate = Double.parseDouble(cube.getAttribute("rate"));
                         entries.put(currency, rate);
                     } // else an empty Cube - ignore
                 }
@@ -191,13 +192,10 @@ public class ExchangeApiImpl implements ExchangeApi {
             Timber.d(ex);
         }
         synchronized (this) {
-            if (date != null) {
-                fetchDate = Calendar.getInstance(TimeZone.getTimeZone("CET"));
-                fxDate = date;
-                fxEntries.clear();
-                fxEntries.putAll(entries);
-            }
-            // else don't change what we have
+            fetchDate = Calendar.getInstance(TimeZone.getTimeZone("CET"));
+            fxDate = date;
+            fxEntries.clear();
+            fxEntries.putAll(entries);
         }
     }
 }

app/src/main/java/com/m2049r/xmrwallet/service/exchange/kraken/ExchangeApiImpl.java

@@ -51,6 +51,11 @@ public class ExchangeApiImpl implements ExchangeApi {
         this(HttpUrl.parse("https://api.kraken.com/0/public/Ticker"));
     }
 
+    @Override
+    public String getName() {
+        return "kraken";
+    }
+
     @Override
     public void queryExchangeRate(@NonNull final String baseCurrency, @NonNull final String quoteCurrency,
                                   @NonNull final ExchangeCallback callback) {

app/src/main/java/com/m2049r/xmrwallet/service/exchange/krakenFiat/ExchangeApiImpl.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019 m2049r@monerujo.io
+ * Copyright (c) 2019-2023 m2049r@monerujo.io
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,7 +16,7 @@
 
 // https://developer.android.com/training/basics/network-ops/xml
 
-package com.m2049r.xmrwallet.service.exchange.krakenEcb;
+package com.m2049r.xmrwallet.service.exchange.krakenFiat;
 
 import androidx.annotation.NonNull;
 
@@ -24,23 +24,39 @@ import com.m2049r.xmrwallet.service.exchange.api.ExchangeApi;
 import com.m2049r.xmrwallet.service.exchange.api.ExchangeCallback;
 import com.m2049r.xmrwallet.service.exchange.api.ExchangeRate;
 import com.m2049r.xmrwallet.util.Helper;
+import com.m2049r.xmrwallet.util.ServiceHelper;
 
 import timber.log.Timber;
 
 /*
-    Gets the XMR/EUR rate from kraken and then gets the EUR/fiat rate from the ECB
+    Gets the XMR/EUR rate from kraken and then gets the EUR/fiat rate from the yadio
  */
 
 public class ExchangeApiImpl implements ExchangeApi {
     static public final String BASE_FIAT = "EUR";
 
+    final ExchangeApi krakenApi = new com.m2049r.xmrwallet.service.exchange.kraken.ExchangeApiImpl();
+
+    private ExchangeApi getFiatApi(String symbol) {
+        return ServiceHelper.getFiatApi(symbol);
+    }
+
+    @Override
+    public String getName() {
+        return krakenApi.getName() + "+";
+    }
+
+    public String getRealName(String fiatService) {
+        return getName() + fiatService;
+    }
+
     @Override
     public void queryExchangeRate(@NonNull final String baseCurrency, @NonNull final String quoteCurrency,
                                   @NonNull final ExchangeCallback callback) {
         Timber.d("B=%s Q=%s", baseCurrency, quoteCurrency);
         if (baseCurrency.equals(quoteCurrency)) {
             Timber.d("BASE=QUOTE=1");
-            callback.onSuccess(new ExchangeRateImpl(baseCurrency, quoteCurrency, 1.0));
+            callback.onSuccess(new ExchangeRateImpl(getName(), baseCurrency, quoteCurrency, 1.0));
             return;
         }
 
@@ -52,24 +68,21 @@ public class ExchangeApiImpl implements ExchangeApi {
 
         final String quote = Helper.BASE_CRYPTO.equals(baseCurrency) ? quoteCurrency : baseCurrency;
 
-        final ExchangeApi krakenApi =
-                new com.m2049r.xmrwallet.service.exchange.kraken.ExchangeApiImpl();
         krakenApi.queryExchangeRate(Helper.BASE_CRYPTO, BASE_FIAT, new ExchangeCallback() {
             @Override
             public void onSuccess(final ExchangeRate krakenRate) {
                 Timber.d("kraken = %f", krakenRate.getRate());
-                final ExchangeApi ecbApi =
-                        new com.m2049r.xmrwallet.service.exchange.ecb.ExchangeApiImpl();
-                ecbApi.queryExchangeRate(BASE_FIAT, quote, new ExchangeCallback() {
+                final ExchangeApi fiatApi = getFiatApi(quote);
+                fiatApi.queryExchangeRate(BASE_FIAT, quote, new ExchangeCallback() {
                     @Override
-                    public void onSuccess(final ExchangeRate ecbRate) {
-                        Timber.d("ECB = %f", ecbRate.getRate());
-                        double rate = ecbRate.getRate() * krakenRate.getRate();
+                    public void onSuccess(final ExchangeRate fiatRate) {
+                        Timber.d("FIAT = %f", fiatRate.getRate());
+                        double rate = fiatRate.getRate() * krakenRate.getRate();
                         Timber.d("Q=%s QC=%s", quote, quoteCurrency);
                         if (!quote.equals(quoteCurrency)) rate = 1.0d / rate;
                         Timber.d("rate = %f", rate);
                         final ExchangeRate exchangeRate =
-                                new ExchangeRateImpl(baseCurrency, quoteCurrency, rate);
+                                new ExchangeRateImpl(getRealName(fiatApi.getName()), baseCurrency, quoteCurrency, rate);
                         callback.onSuccess(exchangeRate);
                     }
 

app/src/main/java/com/m2049r/xmrwallet/service/exchange/krakenFiat/ExchangeRateImpl.java

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2019-2023 m2049r et al.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.service.exchange.krakenFiat;
+
+import androidx.annotation.NonNull;
+
+import com.m2049r.xmrwallet.service.exchange.api.ExchangeApi;
+import com.m2049r.xmrwallet.service.exchange.api.ExchangeRate;
+
+import lombok.Getter;
+
+class ExchangeRateImpl implements ExchangeRate {
+    @Getter
+    private final String serviceName;
+    @Getter
+    private final String baseCurrency;
+    @Getter
+    private final String quoteCurrency;
+    @Getter
+    private final double rate;
+
+    ExchangeRateImpl(@NonNull final String serviceName, @NonNull final String baseCurrency, @NonNull final String quoteCurrency, double rate) {
+        super();
+        this.serviceName = serviceName;
+        this.baseCurrency = baseCurrency;
+        this.quoteCurrency = quoteCurrency;
+        this.rate = rate;
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/service/exchange/yadio/ExchangeApiImpl.java

@@ -0,0 +1,105 @@
+/*
+ * Copyright (c) 2019 m2049r@monerujo.io
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// https://developer.android.com/training/basics/network-ops/xml
+
+package com.m2049r.xmrwallet.service.exchange.yadio;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.VisibleForTesting;
+
+import com.m2049r.xmrwallet.service.exchange.api.ExchangeApi;
+import com.m2049r.xmrwallet.service.exchange.api.ExchangeCallback;
+import com.m2049r.xmrwallet.service.exchange.api.ExchangeException;
+import com.m2049r.xmrwallet.util.NetCipherHelper;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.io.IOException;
+
+import okhttp3.Call;
+import okhttp3.HttpUrl;
+import okhttp3.Response;
+import timber.log.Timber;
+
+public class ExchangeApiImpl implements ExchangeApi {
+    @NonNull
+    private final HttpUrl baseUrl;
+
+    //so we can inject the mockserver url
+    @VisibleForTesting
+    public ExchangeApiImpl(@NonNull final HttpUrl baseUrl) {
+        this.baseUrl = baseUrl;
+    }
+
+    public ExchangeApiImpl() {
+        this(HttpUrl.parse("https://api.yadio.io/convert/1/eur"));
+    }
+
+    @Override
+    public String getName() {
+        return "yadio";
+    }
+
+    @Override
+    public void queryExchangeRate(@NonNull final String baseCurrency, @NonNull final String quoteCurrency,
+                                  @NonNull final ExchangeCallback callback) {
+        if (!baseCurrency.equals("EUR")) {
+            callback.onError(new IllegalArgumentException("Only EUR supported as base"));
+            return;
+        }
+
+        if (baseCurrency.equals(quoteCurrency)) {
+            callback.onSuccess(new ExchangeRateImpl(quoteCurrency, 1.0, 0));
+            return;
+        }
+
+        final HttpUrl url = baseUrl.newBuilder()
+                .addPathSegments(quoteCurrency.substring(0, 3))
+                .build();
+        final NetCipherHelper.Request httpRequest = new NetCipherHelper.Request(url);
+
+        httpRequest.enqueue(new okhttp3.Callback() {
+            @Override
+            public void onFailure(@NonNull final Call call, @NonNull final IOException ex) {
+                callback.onError(ex);
+            }
+
+            @Override
+            public void onResponse(@NonNull final Call call, @NonNull final Response response) throws IOException {
+                if (response.isSuccessful()) {
+                    try {
+                        assert response.body() != null;
+                        final JSONObject json = new JSONObject(response.body().string());
+                        if (json.has("error")) {
+                            Timber.d("%d: %s", response.code(), json.getString("error"));
+                            callback.onError(new ExchangeException(response.code(), json.getString("error")));
+                            return;
+                        }
+                        double rate = json.getDouble("rate");
+                        long timestamp = json.getLong("timestamp");
+                        callback.onSuccess(new ExchangeRateImpl(quoteCurrency, rate, timestamp));
+                    } catch (JSONException ex) {
+                        callback.onError(ex);
+                    }
+                } else {
+                    callback.onError(new ExchangeException(response.code(), response.message()));
+                }
+            }
+        });
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/service/exchange/yadio/ExchangeRateImpl.java

@@ -14,41 +14,34 @@
  * limitations under the License.
  */
 
-package com.m2049r.xmrwallet.service.exchange.krakenEcb;
+package com.m2049r.xmrwallet.service.exchange.yadio;
 
 import androidx.annotation.NonNull;
 
 import com.m2049r.xmrwallet.service.exchange.api.ExchangeRate;
 
+import java.util.Date;
+
+import lombok.Getter;
+
 class ExchangeRateImpl implements ExchangeRate {
-    private final String baseCurrency;
+    @Getter
+    private final String baseCurrency = "EUR";
+    @Getter
     private final String quoteCurrency;
+    @Getter
     private final double rate;
+    private final Date date;
 
     @Override
     public String getServiceName() {
-        return "kraken+ecb";
+        return "yadio.io";
     }
 
-    @Override
-    public String getBaseCurrency() {
-        return baseCurrency;
-    }
-
-    @Override
-    public String getQuoteCurrency() {
-        return quoteCurrency;
-    }
-
-    @Override
-    public double getRate() {
-        return rate;
-    }
-
-    ExchangeRateImpl(@NonNull final String baseCurrency, @NonNull final String quoteCurrency, double rate) {
+    ExchangeRateImpl(@NonNull final String quoteCurrency, double rate, final long timestamp) {
         super();
-        this.baseCurrency = baseCurrency;
         this.quoteCurrency = quoteCurrency;
         this.rate = rate;
+        this.date = timestamp > 0 ? new Date(timestamp) : new Date();
     }
 }

app/src/main/java/com/m2049r/xmrwallet/util/ServiceHelper.java

@@ -1,9 +1,16 @@
 package com.m2049r.xmrwallet.util;
 
+import com.m2049r.xmrwallet.R;
 import com.m2049r.xmrwallet.model.NetworkType;
 import com.m2049r.xmrwallet.model.WalletManager;
 import com.m2049r.xmrwallet.service.exchange.api.ExchangeApi;
 
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import lombok.Getter;
+import lombok.NonNull;
 import okhttp3.HttpUrl;
 
 public class ServiceHelper {
@@ -19,6 +26,14 @@ public class ServiceHelper {
     }
 
     static public ExchangeApi getExchangeApi() {
-        return new com.m2049r.xmrwallet.service.exchange.krakenEcb.ExchangeApiImpl();
+        return new com.m2049r.xmrwallet.service.exchange.krakenFiat.ExchangeApiImpl();
+    }
+
+    static private final ExchangeApi[] fiatApis = new ExchangeApi[]{
+            new com.m2049r.xmrwallet.service.exchange.ecb.ExchangeApiImpl(),
+            new com.m2049r.xmrwallet.service.exchange.yadio.ExchangeApiImpl()};
+
+    static public ExchangeApi getFiatApi(String symbol) {
+        return (symbol.length() == 3) ? fiatApis[0] : fiatApis[1];
     }
 }

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

@@ -169,6 +169,31 @@
                 android:orientation="vertical"
                 android:visibility="invisible">
 
+                <LinearLayout
+                    android:id="@+id/llPocketChange"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:orientation="horizontal"
+                    android:visibility="gone">
+
+                    <TextView
+                        style="@style/MoneroLabel.Gray"
+                        android:layout_width="0dp"
+                        android:layout_height="wrap_content"
+                        android:layout_weight="1"
+                        android:text="@string/pocketchange_title"
+                        android:textAlignment="textStart" />
+
+                    <TextView
+                        android:id="@+id/tvTxChange"
+                        style="@style/MoneroText.Gray"
+                        android:layout_width="0dp"
+                        android:layout_height="wrap_content"
+                        android:layout_weight="2"
+                        android:textAlignment="textEnd"
+                        tools:text="143.008000000000" />
+                </LinearLayout>
+
                 <LinearLayout
                     android:layout_width="match_parent"
                     android:layout_height="wrap_content"
@@ -182,8 +207,7 @@
                         android:layout_height="wrap_content"
                         android:layout_weight="1"
                         android:text="@string/send_fee_btc_label"
-                        android:textAlignment="textStart"
-                        android:textSize="16sp" />
+                        android:textAlignment="textStart" />
 
                     <TextView
                         android:id="@+id/tvTxFee"
@@ -192,7 +216,6 @@
                         android:layout_height="wrap_content"
                         android:layout_weight="2"
                         android:textAlignment="textEnd"
-                        android:textSize="16sp"
                         tools:text="0.006817000000" />
                 </LinearLayout>
 
@@ -209,8 +232,7 @@
                         android:layout_height="wrap_content"
                         android:layout_weight="1"
                         android:text="@string/send_total_btc_label"
-                        android:textAlignment="textStart"
-                        android:textSize="16sp" />
+                        android:textAlignment="textStart" />
 
                     <TextView
                         android:id="@+id/tvTxTotal"
@@ -219,7 +241,6 @@
                         android:layout_height="wrap_content"
                         android:layout_weight="2"
                         android:textAlignment="textEnd"
-                        android:textSize="16sp"
                         tools:text="143.014817000000" />
                 </LinearLayout>
             </LinearLayout>

app/src/main/res/values-cat/strings.xml

@@ -443,7 +443,7 @@
 
     <string name="label_streetmode">Street Mode enabled\nOnly new transactions will be shown</string>
 
-    <string name="pocketchange_info">To reduce waiting time on repeated spending, Monerujo can create spare change at the expense of higher fees. It\'ll try to create and maintain 10 coins of the selected amount.</string>
+    <string name="pocketchange_info">To reduce waiting time on repeated spending, Monerujo can create spare change at the expense of higher fees. It\'ll try to create and maintain at least 6 coins of the selected amount.</string>
     <string name="pocketchange_create_title">Create Change</string>
 
     <string name="label_apply">APPLY</string>

app/src/main/res/values-de/strings.xml

@@ -444,7 +444,7 @@
 
     <string name="label_streetmode">Street Mode enabled\nOnly new transactions will be shown</string>
 
-    <string name="pocketchange_info">To reduce waiting time on repeated spending, Monerujo can create spare change at the expense of higher fees. It\'ll try to create and maintain 10 coins of the selected amount.</string>
+    <string name="pocketchange_info">To reduce waiting time on repeated spending, Monerujo can create spare change at the expense of higher fees. It\'ll try to create and maintain at least 6 coins of the selected amount.</string>
     <string name="pocketchange_create_title">Create Change</string>
 
     <string name="label_apply">APPLY</string>

app/src/main/res/values-el/strings.xml

@@ -445,7 +445,7 @@
 
     <string name="label_streetmode">Street Mode enabled\nOnly new transactions will be shown</string>
 
-    <string name="pocketchange_info">To reduce waiting time on repeated spending, Monerujo can create spare change at the expense of higher fees. It\'ll try to create and maintain 10 coins of the selected amount.</string>
+    <string name="pocketchange_info">To reduce waiting time on repeated spending, Monerujo can create spare change at the expense of higher fees. It\'ll try to create and maintain at least 6 coins of the selected amount.</string>
     <string name="pocketchange_create_title">Create Change</string>
 
     <string name="label_apply">APPLY</string>

app/src/main/res/values-eo/strings.xml

@@ -443,7 +443,7 @@
 
     <string name="label_streetmode">Street Mode enabled\nOnly new transactions will be shown</string>
 
-    <string name="pocketchange_info">To reduce waiting time on repeated spending, Monerujo can create spare change at the expense of higher fees. It\'ll try to create and maintain 10 coins of the selected amount.</string>
+    <string name="pocketchange_info">To reduce waiting time on repeated spending, Monerujo can create spare change at the expense of higher fees. It\'ll try to create and maintain at least 6 coins of the selected amount.</string>
     <string name="pocketchange_create_title">Create Change</string>
 
     <string name="label_apply">APPLY</string>

app/src/main/res/values-es/strings.xml

@@ -433,9 +433,9 @@
 
     <string name="tx_locked">Monto trabado hasta el bloque %1$d (faltan %2$d bloques ≈ %3$,.2f días)</string>
 
-    <string name="label_streetmode">Modo calle activado\nSólo se ºmostrarán transacciones nuevas</string>
+    <string name="label_streetmode">Modo calle activado\nSólo se mostrarán transacciones nuevas</string>
 
-    <string name="pocketchange_info">To reduce waiting time on repeated spending, Monerujo can create spare change at the expense of higher fees. It\'ll try to create and maintain 10 coins of the selected amount.</string>
+    <string name="pocketchange_info">To reduce waiting time on repeated spending, Monerujo can create spare change at the expense of higher fees. It\'ll try to create and maintain at least 6 coins of the selected amount.</string>
     <string name="pocketchange_create_title">Create Change</string>
 
     <string name="label_apply">APPLY</string>

app/src/main/res/values-et/strings.xml

@@ -443,7 +443,7 @@
 
     <string name="label_streetmode">Street Mode enabled\nOnly new transactions will be shown</string>
 
-    <string name="pocketchange_info">To reduce waiting time on repeated spending, Monerujo can create spare change at the expense of higher fees. It\'ll try to create and maintain 10 coins of the selected amount.</string>
+    <string name="pocketchange_info">To reduce waiting time on repeated spending, Monerujo can create spare change at the expense of higher fees. It\'ll try to create and maintain at least 6 coins of the selected amount.</string>
     <string name="pocketchange_create_title">Create Change</string>
 
     <string name="label_apply">APPLY</string>

app/src/main/res/values-fa/strings.xml

@@ -683,7 +683,7 @@
 
     <string name="label_streetmode">Street Mode enabled\nOnly new transactions will be shown</string>
 
-    <string name="pocketchange_info">To reduce waiting time on repeated spending, Monerujo can create spare change at the expense of higher fees. It\'ll try to create and maintain 10 coins of the selected amount.</string>
+    <string name="pocketchange_info">To reduce waiting time on repeated spending, Monerujo can create spare change at the expense of higher fees. It\'ll try to create and maintain at least 6 coins of the selected amount.</string>
     <string name="pocketchange_create_title">Create Change</string>
 
     <string name="label_apply">APPLY</string>

app/src/main/res/values-fr/strings.xml

@@ -449,7 +449,7 @@
 
     <string name="label_streetmode">Street Mode enabled\nOnly new transactions will be shown</string>
 
-    <string name="pocketchange_info">To reduce waiting time on repeated spending, Monerujo can create spare change at the expense of higher fees. It\'ll try to create and maintain 10 coins of the selected amount.</string>
+    <string name="pocketchange_info">To reduce waiting time on repeated spending, Monerujo can create spare change at the expense of higher fees. It\'ll try to create and maintain at least 6 coins of the selected amount.</string>
     <string name="pocketchange_create_title">Create Change</string>
 
     <string name="label_apply">APPLY</string>

app/src/main/res/values-hu/strings.xml

@@ -447,7 +447,7 @@
 
     <string name="label_streetmode">Street Mode enabled\nOnly new transactions will be shown</string>
 
-    <string name="pocketchange_info">To reduce waiting time on repeated spending, Monerujo can create spare change at the expense of higher fees. It\'ll try to create and maintain 10 coins of the selected amount.</string>
+    <string name="pocketchange_info">To reduce waiting time on repeated spending, Monerujo can create spare change at the expense of higher fees. It\'ll try to create and maintain at least 6 coins of the selected amount.</string>
     <string name="pocketchange_create_title">Create Change</string>
 
     <string name="label_apply">APPLY</string>

app/src/main/res/values-it/strings.xml

@@ -448,7 +448,7 @@
 
     <string name="label_streetmode">Street Mode enabled\nOnly new transactions will be shown</string>
 
-    <string name="pocketchange_info">To reduce waiting time on repeated spending, Monerujo can create spare change at the expense of higher fees. It\'ll try to create and maintain 10 coins of the selected amount.</string>
+    <string name="pocketchange_info">To reduce waiting time on repeated spending, Monerujo can create spare change at the expense of higher fees. It\'ll try to create and maintain at least 6 coins of the selected amount.</string>
     <string name="pocketchange_create_title">Create Change</string>
 
     <string name="label_apply">APPLY</string>

app/src/main/res/values-ja/strings.xml

@@ -448,7 +448,7 @@
 
     <string name="label_streetmode">Street Mode enabled\nOnly new transactions will be shown</string>
 
-    <string name="pocketchange_info">To reduce waiting time on repeated spending, Monerujo can create spare change at the expense of higher fees. It\'ll try to create and maintain 10 coins of the selected amount.</string>
+    <string name="pocketchange_info">To reduce waiting time on repeated spending, Monerujo can create spare change at the expense of higher fees. It\'ll try to create and maintain at least 6 coins of the selected amount.</string>
     <string name="pocketchange_create_title">Create Change</string>
 
     <string name="label_apply">APPLY</string>

app/src/main/res/values-nb/strings.xml

@@ -445,7 +445,7 @@
 
     <string name="label_streetmode">Street Mode enabled\nOnly new transactions will be shown</string>
 
-    <string name="pocketchange_info">To reduce waiting time on repeated spending, Monerujo can create spare change at the expense of higher fees. It\'ll try to create and maintain 10 coins of the selected amount.</string>
+    <string name="pocketchange_info">To reduce waiting time on repeated spending, Monerujo can create spare change at the expense of higher fees. It\'ll try to create and maintain at least 6 coins of the selected amount.</string>
     <string name="pocketchange_create_title">Create Change</string>
 
     <string name="label_apply">APPLY</string>

app/src/main/res/values-nl/strings.xml

@@ -445,7 +445,7 @@
 
     <string name="label_streetmode">Street Mode enabled\nOnly new transactions will be shown</string>
 
-    <string name="pocketchange_info">To reduce waiting time on repeated spending, Monerujo can create spare change at the expense of higher fees. It\'ll try to create and maintain 10 coins of the selected amount.</string>
+    <string name="pocketchange_info">To reduce waiting time on repeated spending, Monerujo can create spare change at the expense of higher fees. It\'ll try to create and maintain at least 6 coins of the selected amount.</string>
     <string name="pocketchange_create_title">Create Change</string>
 
     <string name="label_apply">APPLY</string>

app/src/main/res/values-pt-rBR/strings.xml

@@ -438,7 +438,7 @@ aqui.</string>
 
     <string name="label_streetmode">Street Mode enabled\nOnly new transactions will be shown</string>
 
-    <string name="pocketchange_info">To reduce waiting time on repeated spending, Monerujo can create spare change at the expense of higher fees. It\'ll try to create and maintain 10 coins of the selected amount.</string>
+    <string name="pocketchange_info">To reduce waiting time on repeated spending, Monerujo can create spare change at the expense of higher fees. It\'ll try to create and maintain at least 6 coins of the selected amount.</string>
     <string name="pocketchange_create_title">Create Change</string>
 
     <string name="label_apply">APPLY</string>

app/src/main/res/values-pt/strings.xml

@@ -449,8 +449,8 @@
 
     <string name="label_streetmode">Street Mode enabled\nOnly new transactions will be shown</string>
 
-    <string name="pocketchange_amount">10 × %1$3.1f XMR</string>
-    <string name="pocketchange_info">To reduce waiting time on repeated spending, Monerujo can create spare change at the expense of higher fees. It\'ll try to create and maintain 10 coins of the selected amount.</string>
+    <string name="pocketchange_info">To reduce waiting time on repeated spending, Monerujo can create spare change at the expense of higher fees. It\'ll try to create and maintain at least 6 coins of the selected amount.</string>
+    <string name="pocketchange_create_title">Create Change</string>
 
     <string name="label_apply">APPLY</string>
 </resources>

app/src/main/res/values-ro/strings.xml

@@ -445,7 +445,7 @@
 
     <string name="label_streetmode">Street Mode enabled\nOnly new transactions will be shown</string>
 
-    <string name="pocketchange_info">To reduce waiting time on repeated spending, Monerujo can create spare change at the expense of higher fees. It\'ll try to create and maintain 10 coins of the selected amount.</string>
+    <string name="pocketchange_info">To reduce waiting time on repeated spending, Monerujo can create spare change at the expense of higher fees. It\'ll try to create and maintain at least 6 coins of the selected amount.</string>
     <string name="pocketchange_create_title">Create Change</string>
 
     <string name="label_apply">APPLY</string>