1 /*
2  * Copyright (C) 2016 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
5  * except in compliance with the License. You may obtain a copy of the License at
6  *
7  *      http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software distributed under the
10  * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
11  * KIND, either express or implied. See the License for the specific language governing
12  * permissions and limitations under the License.
13  */
14 package com.android.systemui;
15 
16 import android.annotation.Nullable;
17 import android.content.Context;
18 import android.content.res.TypedArray;
19 import android.util.AttributeSet;
20 import android.util.Log;
21 import android.view.View;
22 
23 import com.android.systemui.plugins.PluginListener;
24 import com.android.systemui.plugins.PluginManager;
25 import com.android.systemui.plugins.ViewProvider;
26 import com.android.systemui.res.R;
27 
28 /**
29  * Define an interface or abstract class as follows that includes the
30  * version and action.
31  *
32  * public interface MyInterface {
33  *     public static final String ACTION =
34  *             "com.android.systemui.action.PLUGIN_MYINTERFACE";
35  *
36  *     public static final int VERSION = 1;
37  *
38  *     void myImportantInterface();
39  * }
40  *
41  * Then put in a PluginInflateContainer to use and specify the interface
42  * or class that will be implemented as viewType.  The layout specified
43  * will be used by default and whenever a plugin is not present.
44  *
45  * <com.android.systemui.PluginInflateContainer
46  *     android:id="@+id/some_id"
47  *     android:layout_width="match_parent"
48  *     android:layout_height="match_parent"
49  *     android:layout="@layout/my_default_component"
50  *     systemui:viewType="com.android.systemui.plugins.MyInterface" />
51  */
52 public class PluginInflateContainer extends AutoReinflateContainer
53         implements PluginListener<ViewProvider> {
54 
55     private static final String TAG = "PluginInflateContainer";
56 
57     private Class<ViewProvider> mClass;
58     private View mPluginView;
59 
PluginInflateContainer(Context context, @Nullable AttributeSet attrs)60     public PluginInflateContainer(Context context, @Nullable AttributeSet attrs) {
61         super(context, attrs);
62         TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.PluginInflateContainer);
63         String viewType = a.getString(R.styleable.PluginInflateContainer_viewType);
64         a.recycle();
65         try {
66             mClass = (Class<ViewProvider>) Class.forName(viewType);
67         } catch (Exception e) {
68             Log.d(TAG, "Problem getting class info " + viewType, e);
69             mClass = null;
70         }
71     }
72 
73     @Override
onAttachedToWindow()74     protected void onAttachedToWindow() {
75         super.onAttachedToWindow();
76         if (mClass != null) {
77             Dependency.get(PluginManager.class).addPluginListener(this, mClass);
78         }
79     }
80 
81     @Override
onDetachedFromWindow()82     protected void onDetachedFromWindow() {
83         super.onDetachedFromWindow();
84         if (mClass != null) {
85             Dependency.get(PluginManager.class).removePluginListener(this);
86         }
87     }
88 
89     @Override
inflateLayoutImpl()90     protected void inflateLayoutImpl() {
91         if (mPluginView != null) {
92             addView(mPluginView);
93         } else {
94             super.inflateLayoutImpl();
95         }
96     }
97 
98     @Override
onPluginConnected(ViewProvider plugin, Context context)99     public void onPluginConnected(ViewProvider plugin, Context context) {
100         mPluginView = plugin.getView();
101         inflateLayout();
102     }
103 
104     @Override
onPluginDisconnected(ViewProvider plugin)105     public void onPluginDisconnected(ViewProvider plugin) {
106         mPluginView = null;
107         inflateLayout();
108     }
109 }
110