Android example source code file (GridDelete.java)

This example Android source code file (GridDelete.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

android, arraylist, baseadapter, deleteadapter, griddelete, gridscenario, gridview, integer, keyevent, listadapter, object, override, ui, util, utilities, utils, view, viewgroup, widget

The GridDelete.java Android example source code

/*
 * Copyright (C) 2007 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 android.widget.gridview;

import android.view.KeyEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ListAdapter;

import android.util.GridScenario;

import java.util.ArrayList;

/**
 * A grid with vertical spacing between rows
 */
public class GridDelete extends GridScenario {
    @Override
    protected void init(Params params) {
        params.setStartingSelectionPosition(-1)
                .setMustFillScreen(false)
                .setNumItems(1001)
                .setNumColumns(4)
                .setItemScreenSizeFactor(0.20)
                .setVerticalSpacing(20);
    }
    
    
    
    @Override
    protected ListAdapter createAdapter() {
        return new DeleteAdapter(getInitialNumItems());
    }

    
    
    
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_DEL) {
            GridView g = getGridView();
            ((DeleteAdapter)g.getAdapter()).deletePosition(g.getSelectedItemPosition());
            return true;
        } else {
            return super.onKeyDown(keyCode, event);
        }
    }




    private class DeleteAdapter extends BaseAdapter {
        
        private ArrayList<Integer> mData;
        
        public DeleteAdapter(int initialNumItems) {
            super();
            mData = new ArrayList<Integer>(initialNumItems);
            
            int i;
            for (i=0; i<initialNumItems; ++i) {
                mData.add(new Integer(10000 + i));
            }
            
        }

        public void deletePosition(int selectedItemPosition) {
            if (selectedItemPosition >=0 && selectedItemPosition < mData.size()) {
                mData.remove(selectedItemPosition);
                notifyDataSetChanged();
            }
            
        }

        public int getCount() {
            return mData.size();
        }

        public Object getItem(int position) {
            return mData.get(position);
        }

        public long getItemId(int position) {
            return mData.get(position);
        }

        public View getView(int position, View convertView, ViewGroup parent) {
            int desiredHeight = getDesiredItemHeight();
            return createView(mData.get(position), parent, desiredHeight);
        }
    }
}