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 
27 /**
28  * Define an interface or abstract class as follows that includes the
29  * version and action.
30  *
31  * public interface MyInterface {
32  *     public static final String ACTION =
33  *             "com.android.systemui.action.PLUGIN_MYINTERFACE";
34  *
35  *     public static final int VERSION = 1;
36  *
37  *     void myImportantInterface();
38  * }
39  *
40  * Then put in a PluginInflateContainer to use and specify the interface
41  * or class that will be implemented as viewType.  The layout specified
42  * will be used by default and whenever a plugin is not present.
43  *
44  * <com.android.systemui.PluginInflateContainer
45  *     android:id="@+id/some_id"
46  *     android:layout_width="match_parent"
47  *     android:layout_height="match_parent"
48  *     android:layout="@layout/my_default_component"
49  *     systemui:viewType="com.android.systemui.plugins.MyInterface" />
50  */
51 public class PluginInflateContainer extends AutoReinflateContainer
52         implements PluginListener<ViewProvider> {
53 
54     private static final String TAG = "PluginInflateContainer";
55 
56     private Class<?> mClass;
57     private View mPluginView;
58 
PluginInflateContainer(Context context, @Nullable AttributeSet attrs)59     public PluginInflateContainer(Context context, @Nullable AttributeSet attrs) {
60         super(context, attrs);
61         TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.PluginInflateContainer);
62         String viewType = a.getString(R.styleable.PluginInflateContainer_viewType);
63         try {
64             mClass = Class.forName(viewType);
65         } catch (Exception e) {
66             Log.d(TAG, "Problem getting class info " + viewType, e);
67             mClass = null;
68         }
69     }
70 
71     @Override
onAttachedToWindow()72     protected void onAttachedToWindow() {
73         super.onAttachedToWindow();
74         if (mClass != null) {
75             Dependency.get(PluginManager.class).addPluginListener(this, mClass);
76         }
77     }
78 
79     @Override
onDetachedFromWindow()80     protected void onDetachedFromWindow() {
81         super.onDetachedFromWindow();
82         if (mClass != null) {
83             Dependency.get(PluginManager.class).removePluginListener(this);
84         }
85     }
86 
87     @Override
inflateLayoutImpl()88     protected void inflateLayoutImpl() {
89         if (mPluginView != null) {
90             addView(mPluginView);
91         } else {
92             super.inflateLayoutImpl();
93         }
94     }
95 
96     @Override
onPluginConnected(ViewProvider plugin, Context context)97     public void onPluginConnected(ViewProvider plugin, Context context) {
98         mPluginView = plugin.getView();
99         inflateLayout();
100     }
101 
102     @Override
onPluginDisconnected(ViewProvider plugin)103     public void onPluginDisconnected(ViewProvider plugin) {
104         mPluginView = null;
105         inflateLayout();
106     }
107 }
108