Improve extensions

app/src/main/java/net/pokeranalytics/android/util/Extensions.kt

@@ -1,12 +1,12 @@
 package net.pokeranalytics.android.util
 
-import android.content.Context
 import android.content.res.Resources
 import android.widget.Toast
 import net.pokeranalytics.android.ui.activity.components.PokerAnalyticsActivity
 import net.pokeranalytics.android.ui.fragment.components.PokerAnalyticsFragment
 import java.text.DateFormat
 import java.text.DecimalFormat
+import java.text.NumberFormat
 import java.text.SimpleDateFormat
 import java.util.*
 
@@ -31,8 +31,10 @@ fun Double.round(): String {
 }
 
 fun Double.toCurrency(): String {
-	val formatter = DecimalFormat("##.##")
-	return "$ ${formatter.format(this)}"
+	val format = NumberFormat.getCurrencyInstance()
+	format.maximumFractionDigits = 2
+	format.minimumFractionDigits = 0
+	return format.format(this)
 }
 
 // Calendar
@@ -99,7 +101,7 @@ fun Date.getMonthAndYear(): String {
 }
 
 // Return the duration between two dates
-fun Date.getDuration(context: Context, toDate: Date) : String {
+fun Date.getDuration(toDate: Date) : String {
 	val difference = (toDate.time - this.time).toInt()
 	val numOfDays = (difference / (1000 * 60 * 60 * 24))
 	val hours = (difference / (1000 * 60 * 60))
@@ -111,7 +113,6 @@ fun Date.getDuration(context: Context, toDate: Date) : String {
 	return "$hoursStr:$minutesStr"
 }
 
-
 // Toast
 
 fun PokerAnalyticsActivity.toast(message: String) {