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35  * Through the layoutlib_create tool, selected methods of Preference have been replaced by calls to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
getView(Preference pref, View convertView, ViewGroup parent)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      */
inflatePreference(Context context, XmlPullParser parser, ViewGroup root)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 
createContainerView(Context context, ViewGroup root)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