自定义一个ArrayListAdapter

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 * Copyright (C) 2009 Teleca Poland Sp. z o.o. <[email protected]>
 *
 * 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 grimbo.android.demo.adapter;

import java.util.ArrayList;

import android.app.Activity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;

/**
 * Nice wrapper-abstraction around ArrayList
 * 
 * @author Lukasz Wisniewski
 *
 * @param <T>
 */
public abstract class ArrayListAdapter<T> extends BaseAdapter{
	
	protected ArrayList<T> mList;
	protected Activity mContext;
	protected ListView mListView;
	
	public ArrayListAdapter(Activity context){
		this.mContext = context;
	}

	@Override
	public int getCount() {
		if(mList != null)
			return mList.size();
		else
			return 0;
	}

	@Override
	public Object getItem(int position) {
		return mList == null ? null : mList.get(position);
	}

	@Override
	public long getItemId(int position) {
		return position;
	}

	@Override
	abstract public View getView(int position, View convertView, ViewGroup parent);
	
	public void setList(ArrayList<T> list){
		this.mList = list;
		notifyDataSetChanged();
	}
	
	public ArrayList<T> getList(){
		return mList;
	}
	
	public void setList(T[] list){
		ArrayList<T> arrayList = new ArrayList<T>(list.length);  
		for (T t : list) {  
			arrayList.add(t);  
		}  
		setList(arrayList);
	}
	
	public ListView getListView(){
		return mListView;
	}
	
	public void setListView(ListView listView){
		mListView = listView;
	}

}

 使用方法

 1、自定义一个adapter

public class PurpleAdapter extends ArrayListAdapter<PurpleEntry>

 2、

//存入一个自定义泛型
private ArrayList<PurpleEntry> browseListEntry;

mBrowseJamendoPurpleAdapter.setList(browseListEntry);

3、在自定义PurpleAdapter 中使用

if(mList.get(position).getText() != null){
			holder.text.setText(mList.get(position).getText());