1 /*
2  * Copyright (C) 2007 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 android.widget.gridview;
18 
19 import android.view.KeyEvent;
20 import android.view.View;
21 import android.view.ViewGroup;
22 import android.widget.BaseAdapter;
23 import android.widget.GridView;
24 import android.widget.ListAdapter;
25 
26 import android.util.GridScenario;
27 
28 import java.util.ArrayList;
29 
30 /**
31  * A grid with vertical spacing between rows
32  */
33 public class GridDelete extends GridScenario {
34     @Override
init(Params params)35     protected void init(Params params) {
36         params.setStartingSelectionPosition(-1)
37                 .setMustFillScreen(false)
38                 .setNumItems(1001)
39                 .setNumColumns(4)
40                 .setItemScreenSizeFactor(0.20)
41                 .setVerticalSpacing(20);
42     }
43 
44 
45 
46     @Override
createAdapter()47     protected ListAdapter createAdapter() {
48         return new DeleteAdapter(getInitialNumItems());
49     }
50 
51 
52 
53 
54     @Override
onKeyDown(int keyCode, KeyEvent event)55     public boolean onKeyDown(int keyCode, KeyEvent event) {
56         if (keyCode == KeyEvent.KEYCODE_DEL) {
57             GridView g = getGridView();
58             ((DeleteAdapter)g.getAdapter()).deletePosition(g.getSelectedItemPosition());
59             return true;
60         } else {
61             return super.onKeyDown(keyCode, event);
62         }
63     }
64 
65 
66 
67 
68     private class DeleteAdapter extends BaseAdapter {
69 
70         private ArrayList<Integer> mData;
71 
DeleteAdapter(int initialNumItems)72         public DeleteAdapter(int initialNumItems) {
73             super();
74             mData = new ArrayList<Integer>(initialNumItems);
75 
76             int i;
77             for (i=0; i<initialNumItems; ++i) {
78                 mData.add(new Integer(10000 + i));
79             }
80 
81         }
82 
deletePosition(int selectedItemPosition)83         public void deletePosition(int selectedItemPosition) {
84             if (selectedItemPosition >=0 && selectedItemPosition < mData.size()) {
85                 mData.remove(selectedItemPosition);
86                 notifyDataSetChanged();
87             }
88 
89         }
90 
getCount()91         public int getCount() {
92             return mData.size();
93         }
94 
getItem(int position)95         public Object getItem(int position) {
96             return mData.get(position);
97         }
98 
getItemId(int position)99         public long getItemId(int position) {
100             return mData.get(position);
101         }
102 
getView(int position, View convertView, ViewGroup parent)103         public View getView(int position, View convertView, ViewGroup parent) {
104             int desiredHeight = getDesiredItemHeight();
105             return createView(mData.get(position), parent, desiredHeight);
106         }
107     }
108 }
109