Home | History | Annotate | Download | only in preference 
      1 /*
      2  * Copyright (C) 2014 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package android.preference;
     18 
     19 import com.android.internal.R;
     20 import com.android.layoutlib.bridge.android.BridgeContext;
     21 import com.android.tools.layoutlib.annotations.LayoutlibDelegate;
     22 
     23 import org.xmlpull.v1.XmlPullParser;
     24 
     25 import android.content.Context;
     26 import android.content.res.TypedArray;
     27 import android.view.LayoutInflater;
     28 import android.view.View;
     29 import android.view.ViewGroup;
     30 import android.widget.ListView;
     31 
     32 /**
     33  * Delegate that provides implementation for native methods in {@link Preference}
     34  * <p/>
     35  * Through the layoutlib_create tool, selected methods of Preference have been replaced by calls to
     36  * methods of the same name in this delegate class.
     37  */
     38 public class Preference_Delegate {
     39 
     40     @LayoutlibDelegate
     41     /*package*/ static View getView(Preference pref, View convertView, ViewGroup parent) {
     42         Context context = pref.getContext();
     43         BridgeContext bc = context instanceof BridgeContext ? ((BridgeContext) context) : null;
     44         convertView = pref.getView_Original(convertView, parent);
     45         if (bc != null) {
     46             Object cookie = bc.getCookie(pref);
     47             if (cookie != null) {
     48                 bc.addViewKey(convertView, cookie);
     49             }
     50         }
     51         return convertView;
     52     }
     53 
     54     /**
     55      * Inflates the parser and returns the ListView containing the Preferences.
     56      */
     57     public static View inflatePreference(Context context, XmlPullParser parser, ViewGroup root) {
     58         PreferenceManager pm = new PreferenceManager(context);
     59         PreferenceInflater inflater = new BridgePreferenceInflater(context, pm);
     60         PreferenceScreen ps = (PreferenceScreen) inflater.inflate(parser, null, true);
     61         pm.setPreferences(ps);
     62         ListView preferenceView = createContainerView(context, root);
     63         ps.bind(preferenceView);
     64         return preferenceView;
     65     }
     66 
     67     private static ListView createContainerView(Context context, ViewGroup root) {
     68         TypedArray a = context.obtainStyledAttributes(null, R.styleable.PreferenceFragment,
     69                 R.attr.preferenceFragmentStyle, 0);
     70         int mLayoutResId = a.getResourceId(R.styleable.PreferenceFragment_layout,
     71                         R.layout.preference_list_fragment);
     72         a.recycle();
     73 
     74         LayoutInflater inflater =
     75                 (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
     76         inflater.inflate(mLayoutResId, root, true);
     77 
     78         return (ListView) root.findViewById(android.R.id.list);
     79     }
     80 }
     81