Use correct currency position for all locales.

app/src/main/java/org/thoughtcrime/securesms/payments/FiatMoneyUtil.java

@@ -16,13 +16,21 @@ import org.whispersystems.libsignal.util.guava.Optional;
 import org.whispersystems.signalservice.api.payments.Money;
 
 import java.io.IOException;
+import java.text.DecimalFormat;
+import java.text.DecimalFormatSymbols;
 import java.text.NumberFormat;
+import java.util.Currency;
 import java.util.Locale;
 
-public class FiatMoneyUtil {
+public final class FiatMoneyUtil {
 
   private static final String TAG = Log.tag(FiatMoneyUtil.class);
 
+  private static final char CURRENCY_SYMBOL_PLACE_HOLDER = '\u00A4';
+  private static final char NON_BREAKING_WHITESPACE      = '\u00A0';
+
+  private FiatMoneyUtil() {}
+
   public static @NonNull LiveData<Optional<FiatMoney>> getExchange(@NonNull LiveData<Money> amount) {
     return LiveDataUtil.mapAsync(amount, a -> {
       try {
@@ -61,6 +69,38 @@ public class FiatMoneyUtil {
     return formattedAmount;
   }
 
+  /**
+   * Prefixes or postfixes the currency symbol based on the formatter for the currency.
+   *
+   * @param value String so that you can force trailing zeros.
+   */
+  public static String manualFormat(@NonNull Currency currency, @NonNull String value) {
+    NumberFormat format = NumberFormat.getCurrencyInstance();
+    format.setCurrency(currency);
+
+    DecimalFormat        decimalFormat        = (DecimalFormat) format;
+    DecimalFormatSymbols decimalFormatSymbols = decimalFormat.getDecimalFormatSymbols();
+    String               symbol               = decimalFormatSymbols.getCurrencySymbol();
+    String               localizedPattern     = decimalFormat.toLocalizedPattern();
+    int                  currencySymbolIndex  = localizedPattern.indexOf(CURRENCY_SYMBOL_PLACE_HOLDER);
+    boolean              prefixSymbol         = currencySymbolIndex <= 0;
+
+    if (currencySymbolIndex == 0) {
+      char cAfterSymbol = localizedPattern.charAt(currencySymbolIndex + 1);
+      if (Character.isWhitespace(cAfterSymbol) || cAfterSymbol == NON_BREAKING_WHITESPACE) {
+        symbol = symbol + cAfterSymbol;
+      }
+    } else if (currencySymbolIndex > 0) {
+      char cBeforeSymbol = localizedPattern.charAt(currencySymbolIndex - 1);
+      if (Character.isWhitespace(cBeforeSymbol) || cBeforeSymbol == NON_BREAKING_WHITESPACE) {
+        symbol = cBeforeSymbol + symbol;
+      }
+    }
+
+    return prefixSymbol ? symbol + value
+                        : value + symbol;
+  }
+
   public static FormatOptions formatOptions() {
     return new FormatOptions();
   }

app/src/main/java/org/thoughtcrime/securesms/payments/create/CreatePaymentFragment.java

@@ -2,7 +2,6 @@ package org.thoughtcrime.securesms.payments.create;
 
 import android.app.AlertDialog;
 import android.graphics.drawable.Drawable;
-import android.graphics.drawable.LayerDrawable;
 import android.os.Bundle;
 import android.text.SpannableStringBuilder;
 import android.text.TextUtils;
@@ -148,12 +147,12 @@ public class CreatePaymentFragment extends LoggingFragment {
   }
 
   private void initializeInfoIcon() {
-    spacer  = Objects.requireNonNull(AppCompatResources.getDrawable(requireContext(), R.drawable.payment_info_pad));
+    spacer   = Objects.requireNonNull(AppCompatResources.getDrawable(requireContext(), R.drawable.payment_info_pad));
     infoIcon = Objects.requireNonNull(AppCompatResources.getDrawable(requireContext(), R.drawable.ic_update_info_16));
 
     DrawableCompat.setTint(infoIcon, exchange.getCurrentTextColor());
 
-    spacer.setBounds(0, 0, ViewUtil.dpToPx(13), ViewUtil.dpToPx(16));
+    spacer.setBounds(0, 0, ViewUtil.dpToPx(8), ViewUtil.dpToPx(16));
     infoIcon.setBounds(0, 0, ViewUtil.dpToPx(16), ViewUtil.dpToPx(16));
   }
 
@@ -182,6 +181,7 @@ public class CreatePaymentFragment extends LoggingFragment {
         break;
       case FIAT_MONEY:
         amount.setMoney(inputState.getMoney(), false, inputState.getExchangeRate().get().getTimestamp());
+        amount.append(SpanUtil.buildImageSpan(spacer));
         amount.append(SpanUtil.buildImageSpan(infoIcon));
         break;
     }
@@ -205,8 +205,7 @@ public class CreatePaymentFragment extends LoggingFragment {
         break;
       case FIAT_MONEY:
         Currency currency = inputState.getFiatMoney().get().getCurrency();
-        exchange.setText(new SpannableStringBuilder().append(currency.getSymbol())
-                                                     .append(inputState.getFiatAmount()));
+        exchange.setText(FiatMoneyUtil.manualFormat(currency, inputState.getFiatAmount()));
         break;
     }
   }

app/src/test/java/org/thoughtcrime/securesms/payments/FiatMoneyUtil_manualFormat_Test.java

@@ -0,0 +1,65 @@
+package org.thoughtcrime.securesms.payments;
+
+import org.junit.Test;
+
+import java.util.Currency;
+import java.util.Locale;
+
+import static org.junit.Assert.assertEquals;
+
+public final class FiatMoneyUtil_manualFormat_Test {
+
+  @Test
+  public void gbp_UK() {
+    Locale.setDefault(Locale.UK);
+
+    String format = FiatMoneyUtil.manualFormat(Currency.getInstance("GBP"), "1.20");
+
+    assertEquals("£1.20", format);
+  }
+
+  @Test
+  public void eur_France() {
+    Locale.setDefault(Locale.FRANCE);
+
+    String format = FiatMoneyUtil.manualFormat(Currency.getInstance("EUR"), "2");
+
+    assertEquals("2 €", format);
+  }
+
+  @Test
+  public void aud_France() {
+    Locale.setDefault(Locale.FRANCE);
+
+    String format = FiatMoneyUtil.manualFormat(Currency.getInstance("AUD"), "1");
+
+    assertEquals("1 AUD", format);
+  }
+
+  @Test
+  public void usd_US() {
+    Locale.setDefault(Locale.US);
+
+    String format = FiatMoneyUtil.manualFormat(Currency.getInstance("USD"), "4.0");
+
+    assertEquals("$4.0", format);
+  }
+
+  @Test
+  public void cad_US() {
+    Locale.setDefault(Locale.US);
+
+    String format = FiatMoneyUtil.manualFormat(Currency.getInstance("CAD"), "5.00");
+
+    assertEquals("CAD5.00", format);
+  }
+
+  @Test
+  public void cad_Canada() {
+    Locale.setDefault(Locale.CANADA);
+
+    String format = FiatMoneyUtil.manualFormat(Currency.getInstance("CAD"), "5.12");
+
+    assertEquals("$5.12", format);
+  }
+}