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      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 
     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
     72     protected void onAttachedToWindow() {
     73         super.onAttachedToWindow();
     74         if (mClass != null) {
     75             Dependency.get(PluginManager.class).addPluginListener(this, mClass);
     76         }
     77     }
     78 
     79     @Override
     80     protected void onDetachedFromWindow() {
     81         super.onDetachedFromWindow();
     82         if (mClass != null) {
     83             Dependency.get(PluginManager.class).removePluginListener(this);
     84         }
     85     }
     86 
     87     @Override
     88     protected void inflateLayoutImpl() {
     89         if (mPluginView != null) {
     90             addView(mPluginView);
     91         } else {
     92             super.inflateLayoutImpl();
     93         }
     94     }
     95 
     96     @Override
     97     public void onPluginConnected(ViewProvider plugin, Context context) {
     98         mPluginView = plugin.getView();
     99         inflateLayout();
    100     }
    101 
    102     @Override
    103     public void onPluginDisconnected(ViewProvider plugin) {
    104         mPluginView = null;
    105         inflateLayout();
    106     }
    107 }
    108