Fixing keyboard theme selection

Bug: 17937287
Change-Id: I476045980843c5897820cd544daea06fa991acb5
diff --git a/java/src/com/android/inputmethod/keyboard/KeyboardTheme.java b/java/src/com/android/inputmethod/keyboard/KeyboardTheme.java
index 6d8c8b7..8a9688a 100644
--- a/java/src/com/android/inputmethod/keyboard/KeyboardTheme.java
+++ b/java/src/com/android/inputmethod/keyboard/KeyboardTheme.java
@@ -22,7 +22,6 @@
 import android.preference.PreferenceManager;
 import android.util.Log;
 
-import com.android.inputmethod.annotations.UsedForTesting;
 import com.android.inputmethod.compat.BuildCompatUtils;
 import com.android.inputmethod.latin.R;
 
@@ -45,7 +44,7 @@
 
     private static KeyboardTheme[] AVAILABLE_KEYBOARD_THEMES;
 
-    @UsedForTesting
+    /* package private for testing */
     static final KeyboardTheme[] KEYBOARD_THEMES = {
         new KeyboardTheme(THEME_ID_ICS, "ICS", R.style.KeyboardTheme_ICS,
                 // This has never been selected because we support ICS or later.
@@ -57,6 +56,7 @@
                 // Default theme for LXX.
                 BuildCompatUtils.VERSION_CODES_LXX),
         new KeyboardTheme(THEME_ID_LXX_DARK, "LXXDark", R.style.KeyboardTheme_LXX_Dark,
+                // This has never been selected as default theme.
                 VERSION_CODES.BASE),
     };
 
@@ -68,7 +68,7 @@
     public final int mThemeId;
     public final int mStyleId;
     public final String mThemeName;
-    private final int mMinApiVersion;
+    public final int mMinApiVersion;
 
     // Note: The themeId should be aligned with "themeId" attribute of Keyboard style
     // in values/themes-<style>.xml.
@@ -98,7 +98,7 @@
         return mThemeId;
     }
 
-    @UsedForTesting
+    /* package private for testing */
     static KeyboardTheme searchKeyboardThemeById(final int themeId,
             final KeyboardTheme[] availableThemeIds) {
         // TODO: This search algorithm isn't optimal if there are many themes.
@@ -110,7 +110,7 @@
         return null;
     }
 
-    @UsedForTesting
+    /* package private for testing */
     static KeyboardTheme getDefaultKeyboardTheme(final SharedPreferences prefs,
             final int sdkVersion, final KeyboardTheme[] availableThemeArray) {
         final String klpThemeIdString = prefs.getString(KLP_KEYBOARD_THEME_KEY, null);
@@ -150,7 +150,7 @@
         saveKeyboardThemeId(themeId, prefs, BuildCompatUtils.EFFECTIVE_SDK_INT);
     }
 
-    @UsedForTesting
+    /* package private for testing */
     static String getPreferenceKey(final int sdkVersion) {
         if (sdkVersion <= VERSION_CODES.KITKAT) {
             return KLP_KEYBOARD_THEME_KEY;
@@ -158,7 +158,7 @@
         return LXX_KEYBOARD_THEME_KEY;
     }
 
-    @UsedForTesting
+    /* package private for testing */
     static void saveKeyboardThemeId(final int themeId, final SharedPreferences prefs,
             final int sdkVersion) {
         final String prefKey = getPreferenceKey(sdkVersion);
@@ -171,6 +171,7 @@
         return getKeyboardTheme(prefs, BuildCompatUtils.EFFECTIVE_SDK_INT, availableThemeArray);
     }
 
+    /* package private for testing */
     static KeyboardTheme[] getAvailableThemeArray(final Context context) {
         if (AVAILABLE_KEYBOARD_THEMES == null) {
             final int[] availableThemeIdStringArray = context.getResources().getIntArray(
@@ -184,11 +185,12 @@
             }
             AVAILABLE_KEYBOARD_THEMES = availableThemeList.toArray(
                     new KeyboardTheme[availableThemeList.size()]);
+            Arrays.sort(AVAILABLE_KEYBOARD_THEMES);
         }
         return AVAILABLE_KEYBOARD_THEMES;
     }
 
-    @UsedForTesting
+    /* package private for testing */
     static KeyboardTheme getKeyboardTheme(final SharedPreferences prefs, final int sdkVersion,
             final KeyboardTheme[] availableThemeArray) {
         final String lxxThemeIdString = prefs.getString(LXX_KEYBOARD_THEME_KEY, null);
diff --git a/tests/src/com/android/inputmethod/keyboard/KeyboardThemeTests.java b/tests/src/com/android/inputmethod/keyboard/KeyboardThemeTests.java
index 34cf407..d642a10 100644
--- a/tests/src/com/android/inputmethod/keyboard/KeyboardThemeTests.java
+++ b/tests/src/com/android/inputmethod/keyboard/KeyboardThemeTests.java
@@ -348,6 +348,31 @@
     }
 
     /*
+     * Test that KeyboardTheme array should be sorted by descending order of
+     * {@link KeyboardTheme#mMinApiVersion}.
+     */
+    private static void assertSortedKeyboardThemeArray(final KeyboardTheme[] array) {
+        assertNotNull(array);
+        final int length = array.length;
+        assertTrue("array length=" + length, length > 0);
+        for (int index = 0; index < length - 1; index++) {
+            final KeyboardTheme theme = array[index];
+            final KeyboardTheme nextTheme = array[index + 1];
+            assertTrue("sorted MinApiVersion: "
+                    + theme.mThemeName + ": minApiVersion=" + theme.mMinApiVersion,
+                    theme.mMinApiVersion >= nextTheme.mMinApiVersion);
+        }
+    }
+
+    public void testSortedKeyboardTheme() {
+        assertSortedKeyboardThemeArray(KeyboardTheme.KEYBOARD_THEMES);
+    }
+
+    public void testSortedAvailableKeyboardTheme() {
+        assertSortedKeyboardThemeArray(KeyboardTheme.getAvailableThemeArray(getContext()));
+    }
+
+    /*
      * Test for missing selected theme.
      */
     private static KeyboardTheme[] LIMITED_THEMES = {
@@ -356,6 +381,7 @@
     };
     static {
         Arrays.sort(LIMITED_THEMES);
+        assertSortedKeyboardThemeArray(LIMITED_THEMES);
     }
 
     public void testMissingSelectedThemeIcs() {