update the sample app and add methods to get the int value for purpos…

…es such as saving to shared preferences

yearclass-sample/src/main/java/com/facebook/device/yearclass/sample/MainActivity.java

@@ -32,29 +32,30 @@ protected void onCreate(Bundle savedInstanceState) {
     mYearClass = (TextView) findViewById(R.id.year_class);
   }
 
-  private class GetOrComputeYearClass extends AsyncTask<Void, Void, Integer> {
+  private class GetOrComputeYearClass extends AsyncTask<Void, Void, YearClass> {
 
     @Override
-    protected Integer doInBackground(Void... voids) {
-      int yearClass = YearClass.CLASS_UNKNOWN;
+    protected YearClass doInBackground(Void... voids) {
+      YearClass yearClass = YearClass.CLASS_UNKNOWN;
       SharedPreferences prefs = getSharedPreferences(PREF_FILE, 0);
       if (prefs.contains(PREF_NAME)) {
-        yearClass = prefs.getInt(PREF_NAME, YearClass.CLASS_UNKNOWN);
+        yearClass = YearClass.fromIntValue(prefs.getInt(PREF_NAME,
+                YearClass.CLASS_UNKNOWN.getIntValue()));
       }
       //Try again if device was previously unknown.
       if (yearClass == YearClass.CLASS_UNKNOWN) {
         yearClass = YearClass.get(getApplicationContext());
         SharedPreferences.Editor editor = prefs.edit();
-        editor.putInt(PREF_NAME, yearClass);
+        editor.putInt(PREF_NAME, yearClass.getIntValue());
         editor.apply();
       }
       return yearClass;
     }
 
     @Override
-    protected void onPostExecute(Integer yearClass) {
+    protected void onPostExecute(YearClass yearClass) {
       //update UI
-      mYearClass.setText(Integer.toString(yearClass));
+      mYearClass.setText(Integer.toString(yearClass.getIntValue()));
     }
   }
 }

yearclass/src/main/java/com/facebook/device/yearclass/YearClass.java

@@ -29,7 +29,7 @@ public enum YearClass {
   /**
    * @return a YearClass constructed from the integer value, or CLASS_UNKNOWN if not found.
    */
-  private static YearClass fromIntValue(int intValue) {
+  public static YearClass fromIntValue(int intValue) {
     for (YearClass yearClass : YearClass.values()) {
       if (intValue == yearClass.mIntValue) {
         return yearClass;
@@ -38,6 +38,13 @@ private static YearClass fromIntValue(int intValue) {
     return CLASS_UNKNOWN;
   }
 
+  /**
+   * @return a integer value associated with the YearClass.  For example, CLASS_2008 will return 2008.
+   */
+  public int getIntValue() {
+    return mIntValue;
+  }
+
   /**
    * Calculates the YearClass class by the number of processor cores the phone has.
    * Evaluations are based off the table below:
@@ -54,7 +61,7 @@ private static YearClass fromIntValue(int intValue) {
    *
    * @return the YearClass in which top-of-the-line phones had the same number of processors as this phone.
    */
-  public static YearClass fromNumberOfCores() {
+  private static YearClass fromNumberOfCores() {
     int cores = DeviceInfo.getNumberOfCPUCores();
     if (cores < 1) return CLASS_UNKNOWN;
     if (cores == 1) return CLASS_2008;