1 /*
2  * Copyright (C) 2013 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 com.example.android.insertingcells;
18 
19 import android.app.Activity;
20 import android.content.Context;
21 import android.graphics.Bitmap;
22 import android.graphics.Bitmap.Config;
23 import android.graphics.BitmapFactory;
24 import android.graphics.Canvas;
25 import android.graphics.Paint;
26 import android.graphics.PorterDuff.Mode;
27 import android.graphics.PorterDuffXfermode;
28 import android.graphics.Rect;
29 import android.view.LayoutInflater;
30 import android.view.View;
31 import android.view.ViewGroup;
32 import android.widget.ArrayAdapter;
33 import android.widget.ImageView;
34 import android.widget.ListView;
35 import android.widget.TextView;
36 
37 import java.util.HashMap;
38 import java.util.List;
39 
40 /**
41  * This custom array adapter is used to populate the ListView in this application.
42  * This adapter also maintains a map of unique stable ids for each object in the data set.
43  * Since this adapter has to support the addition of a new cell to the 1ist index, it also
44  * provides a mechanism to add a stable ID for new data that was recently inserted.
45  */
46 public class CustomArrayAdapter extends ArrayAdapter<ListItemObject> {
47 
48     HashMap<ListItemObject, Integer> mIdMap = new HashMap<ListItemObject, Integer>();
49     List<ListItemObject> mData;
50     Context mContext;
51     int mLayoutViewResourceId;
52     int mCounter;
53 
CustomArrayAdapter(Context context, int layoutViewResourceId, List <ListItemObject> data)54     public CustomArrayAdapter(Context context, int layoutViewResourceId,
55                               List <ListItemObject> data) {
56         super(context, layoutViewResourceId, data);
57         mData = data;
58         mContext = context;
59         mLayoutViewResourceId = layoutViewResourceId;
60         updateStableIds();
61     }
62 
getItemId(int position)63     public long getItemId(int position) {
64         ListItemObject item = getItem(position);
65         if (mIdMap.containsKey(item)) {
66             return mIdMap.get(item);
67         }
68         return -1;
69     }
70 
updateStableIds()71     public void updateStableIds() {
72         mIdMap.clear();
73         mCounter = 0;
74         for (int i = 0; i < mData.size(); ++i) {
75             mIdMap.put(mData.get(i), mCounter++);
76         }
77     }
78 
addStableIdForDataAtPosition(int position)79     public void addStableIdForDataAtPosition(int position) {
80         mIdMap.put(mData.get(position), ++mCounter);
81     }
82 
83     @Override
hasStableIds()84     public boolean hasStableIds() {
85         return true;
86     }
87 
88     @Override
getView(int position, View convertView, ViewGroup parent)89     public View getView(int position, View convertView, ViewGroup parent) {
90 
91         ListItemObject obj = mData.get(position);
92 
93         if(convertView == null) {
94             LayoutInflater inflater = ((Activity)mContext).getLayoutInflater();
95             convertView = inflater.inflate(mLayoutViewResourceId, parent, false);
96         }
97 
98         convertView.setLayoutParams(new ListView.LayoutParams(ListView.LayoutParams
99                 .MATCH_PARENT, obj.getHeight()));
100 
101         ImageView imgView = (ImageView)convertView.findViewById(R.id.image_view);
102         TextView textView = (TextView)convertView.findViewById(R.id.text_view);
103 
104         Bitmap bitmap = BitmapFactory.decodeResource(mContext.getResources(),
105                 obj.getImgResource(), null);
106 
107         textView.setText(obj.getTitle());
108         imgView.setImageBitmap(CustomArrayAdapter.getCroppedBitmap(bitmap));
109 
110         return convertView;
111     }
112 
113     /**
114      * Returns a circular cropped version of the bitmap passed in.
115      */
getCroppedBitmap(Bitmap bitmap)116     public static Bitmap getCroppedBitmap(Bitmap bitmap) {
117         Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(),
118                 Config.ARGB_8888);
119 
120         final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
121 
122         Canvas canvas = new Canvas(output);
123 
124         final Paint paint = new Paint();
125         paint.setAntiAlias(true);
126 
127         int halfWidth = bitmap.getWidth() / 2;
128         int halfHeight = bitmap.getHeight() / 2;
129 
130         canvas.drawCircle(halfWidth, halfHeight, Math.max(halfWidth, halfHeight), paint);
131 
132         paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
133 
134         canvas.drawBitmap(bitmap, rect, rect, paint);
135 
136         return output;
137     }
138 }