Allow the framework to recycle ApnPreference views

BUG: 10079104
Change-Id: Iaa4f155da12a141f16300076cc820d47e0c5779a

res/values/styles.xml

@@ -241,4 +241,8 @@
 
     <!-- Scrollbar style OUTSIDE_OVERLAY -->
     <integer name="preference_scrollbar_style">33554432</integer>
+
+    <style name="ApnPreference">
+        <item name="android:layout">@layout/apn_preference_layout</item>
+    </style>
 </resources>

src/com/android/settings/ApnPreference.java

@@ -35,31 +35,16 @@ public class ApnPreference extends Preference implements
         CompoundButton.OnCheckedChangeListener, OnClickListener {
     final static String TAG = "ApnPreference";
 
-    /**
-     * @param context
-     * @param attrs
-     * @param defStyle
-     */
     public ApnPreference(Context context, AttributeSet attrs, int defStyle) {
         super(context, attrs, defStyle);
-        init();
     }
 
-    /**
-     * @param context
-     * @param attrs
-     */
     public ApnPreference(Context context, AttributeSet attrs) {
-        super(context, attrs);
-        init();
+        this(context, attrs, R.style.ApnPreference);
     }
 
-    /**
-     * @param context
-     */
     public ApnPreference(Context context) {
-        super(context);
-        init();
+        this(context, null);
     }
 
     private static String mSelectedKey = null;
@@ -99,10 +84,6 @@ public class ApnPreference extends Preference implements
         return view;
     }
 
-    private void init() {
-        setLayoutResource(R.layout.apn_preference_layout);
-    }
-
     public boolean isChecked() {
         return getKey().equals(mSelectedKey);
     }