1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
|
/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.example.android.expandingcells;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import java.util.List;
/**
* This is a custom array adapter used to populate the listview whose items will
* expand to display extra content in addition to the default display.
*/
public class CustomArrayAdapter extends ArrayAdapter<ExpandableListItem> {
private List<ExpandableListItem> mData;
private int mLayoutViewResourceId;
public CustomArrayAdapter(Context context, int layoutViewResourceId,
List<ExpandableListItem> data) {
super(context, layoutViewResourceId, data);
mData = data;
mLayoutViewResourceId = layoutViewResourceId;
}
/**
* Populates the item in the listview cell with the appropriate data. This method
* sets the thumbnail image, the title and the extra text. This method also updates
* the layout parameters of the item's view so that the image and title are centered
* in the bounds of the collapsed view, and such that the extra text is not displayed
* in the collapsed state of the cell.
*/
@Override
public View getView(int position, View convertView, ViewGroup parent) {
final ExpandableListItem object = mData.get(position);
if(convertView == null) {
LayoutInflater inflater = ((Activity) getContext()).getLayoutInflater();
convertView = inflater.inflate(mLayoutViewResourceId, parent, false);
}
LinearLayout linearLayout = (LinearLayout)(convertView.findViewById(
R.id.item_linear_layout));
LinearLayout.LayoutParams linearLayoutParams = new LinearLayout.LayoutParams
(AbsListView.LayoutParams.MATCH_PARENT, object.getCollapsedHeight());
linearLayout.setLayoutParams(linearLayoutParams);
ImageView imgView = (ImageView)convertView.findViewById(R.id.image_view);
TextView titleView = (TextView)convertView.findViewById(R.id.title_view);
TextView textView = (TextView)convertView.findViewById(R.id.text_view);
titleView.setText(object.getTitle());
imgView.setImageBitmap(getCroppedBitmap(BitmapFactory.decodeResource(getContext()
.getResources(), object.getImgResource(), null)));
textView.setText(object.getText());
convertView.setLayoutParams(new ListView.LayoutParams(AbsListView.LayoutParams.MATCH_PARENT,
AbsListView.LayoutParams.WRAP_CONTENT));
ExpandingLayout expandingLayout = (ExpandingLayout)convertView.findViewById(R.id
.expanding_layout);
expandingLayout.setExpandedHeight(object.getExpandedHeight());
expandingLayout.setSizeChangedListener(object);
if (!object.isExpanded()) {
expandingLayout.setVisibility(View.GONE);
} else {
expandingLayout.setVisibility(View.VISIBLE);
}
return convertView;
}
/**
* Crops a circle out of the thumbnail photo.
*/
public Bitmap getCroppedBitmap(Bitmap bitmap) {
Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(),
Config.ARGB_8888);
final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
Canvas canvas = new Canvas(output);
final Paint paint = new Paint();
paint.setAntiAlias(true);
int halfWidth = bitmap.getWidth()/2;
int halfHeight = bitmap.getHeight()/2;
canvas.drawCircle(halfWidth, halfHeight, Math.max(halfWidth, halfHeight), paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
return output;
}
}
|
