Home | History | Annotate | Download | only in gridview 
      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
     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
     47     protected ListAdapter createAdapter() {
     48         return new DeleteAdapter(getInitialNumItems());
     49     }
     50 
     51 
     52 
     53 
     54     @Override
     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 
     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 
     83         public void deletePosition(int selectedItemPosition) {
     84             if (selectedItemPosition >=0 && selectedItemPosition < mData.size()) {
     85                 mData.remove(selectedItemPosition);
     86                 notifyDataSetChanged();
     87             }
     88 
     89         }
     90 
     91         public int getCount() {
     92             return mData.size();
     93         }
     94 
     95         public Object getItem(int position) {
     96             return mData.get(position);
     97         }
     98 
     99         public long getItemId(int position) {
    100             return mData.get(position);
    101         }
    102 
    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