No longer use reflection to implement search functionality

FIX: 76211248

Change-Id: I91a99036e9b01cddb49e9a506a0cdfe978d348c6

Author: tony-mak

app/src/main/java/com/afwsamples/testdpc/search/PreferenceXmlUtil.java

@@ -5,38 +5,29 @@
 import android.util.AttributeSet;
 import android.util.TypedValue;
 
-import java.lang.reflect.Field;
-
 /**
  * Util class to retrieve some values of attributes in preference xml.
  * To achieve this, we need to:
- * 1. Obtain the array android.R$styleable.Preference through reflection.
- *    Cache is introduced to reduce the performance overhead introduced by reflection.
- * 2. Obtain the resource id of certain attributes that we care such as title and key using
- *    reflection. Again, cache is introduced.
- * 3. Obtain the value of those attribute {@link TypedArray#peekValue(int)}.
+ * 1. Obtain the resource id of certain attributes that we care such as title and key.
+ * 2. Obtain the value of those attribute {@link TypedArray#peekValue(int)}.
  */
 public class PreferenceXmlUtil {
-    private static Integer sPreferenceTitleId;
-    private static Integer sPreferenceKeyId;
-    private static int[] sPreferenceStyleArray;
 
     public static String getDataTitle(Context context, AttributeSet attrs)
             throws ReflectiveOperationException {
-        return getData(context, attrs, getPreferenceTitleId());
+        return getData(context, attrs, android.R.attr.title);
     }
 
     public static String getDataKey(Context context, AttributeSet attrs)
             throws ReflectiveOperationException {
-        return getData(context, attrs, getPreferenceKeyId());
+        return getData(context, attrs, android.R.attr.key);
     }
 
-    private static String getData(Context context, AttributeSet set, int resId)
+    private static String getData(Context context, AttributeSet set, int attribute)
             throws ReflectiveOperationException {
-        int[] attrs = getPreferenceStyleArray();
-        final TypedArray sa = context.obtainStyledAttributes(set, attrs);
+        final TypedArray sa = context.obtainStyledAttributes(set, new int[] {attribute});
         try {
-            final TypedValue tv = sa.peekValue(resId);
+            final TypedValue tv = sa.peekValue(0);
             CharSequence data = null;
             if (tv != null && tv.type == TypedValue.TYPE_STRING) {
                 if (tv.resourceId != 0) {
@@ -50,35 +41,4 @@ private static String getData(Context context, AttributeSet set, int resId)
             sa.recycle();
         }
     }
-
-    private static int getPreferenceTitleId() throws ReflectiveOperationException {
-        if (sPreferenceTitleId == null) {
-            sPreferenceTitleId = getStyleableId("Preference_title");
-        }
-        return sPreferenceTitleId;
-    }
-
-    private static int getPreferenceKeyId() throws ReflectiveOperationException {
-        if (sPreferenceKeyId == null) {
-            sPreferenceKeyId = getStyleableId("Preference_key");
-        }
-        return sPreferenceKeyId;
-    }
-
-    private static int[] getPreferenceStyleArray() throws ReflectiveOperationException {
-        if (sPreferenceStyleArray == null) {
-            sPreferenceStyleArray = getStyleableArray("Preference");
-        }
-        return sPreferenceStyleArray;
-    }
-
-    private static int getStyleableId(String name) throws ReflectiveOperationException {
-        Field field = Class.forName("android.R$styleable").getDeclaredField(name);
-        return (int) field.get(null);
-    }
-
-    private static final int[] getStyleableArray(String name) throws ReflectiveOperationException {
-        Field field = Class.forName("android.R$styleable").getDeclaredField(name);
-        return (int[]) field.get(null);
-    }
 }