Switch from SI to IEC unit when formatting data usage bytes

- Created a new helper method DataUsageUtils.formatDataUsage() to
  format data usage bytes using IEC formatting.
- Switch from Formatter.formatFileSize() to DataUsageUtils.formatDataUsage()
  everywhere in datausage package.

Change-Id: I9323beed8bf5126b153fc9a3cdd9591c97ca6fd2
Bug: 76159924
Test: robotests

src/com/android/settings/datausage/DataUsageUtils.java

@@ -14,7 +14,6 @@
 
 package com.android.settings.datausage;
 
-import static android.net.ConnectivityManager.TYPE_ETHERNET;
 import static android.net.ConnectivityManager.TYPE_WIFI;
 
 import android.content.Context;
@@ -29,6 +28,10 @@ import android.os.SystemProperties;
 import android.telephony.SubscriptionInfo;
 import android.telephony.SubscriptionManager;
 import android.telephony.TelephonyManager;
+import android.text.BidiFormatter;
+import android.text.format.Formatter;
+import android.text.format.Formatter.BytesResult;
+
 import java.util.List;
 
 /**
@@ -42,6 +45,16 @@ public final class DataUsageUtils {
     private DataUsageUtils() {
     }
 
+    /**
+     * Format byte value to readable string using IEC units.
+     */
+    public static CharSequence formatDataUsage(Context context, long byteValue) {
+        final BytesResult res = Formatter.formatBytes(context.getResources(), byteValue,
+                Formatter.FLAG_IEC_UNITS);
+        return BidiFormatter.getInstance().unicodeWrap(context.getString(
+                com.android.internal.R.string.fileSizeSuffix, res.value, res.units));
+    }
+
     /**
      * Test if device has an ethernet network connection.
      */