public class AppManagerAdapter extends BaseAdapter {
	private static final String TAG = "AppManagerAdapter";
	private List<AppInfo> appinfos;
	private Context context;
	//把要创建的ImageView和TextView定义在外面成静态
	private static ImageView iv;
	private static TextView tv;

	public AppManagerAdapter(List<AppInfo> appinfos, Context context) {
		this.appinfos = appinfos;
		this.context = context;
	}

	public int getCount() {
		// TODO Auto-generated method stub
		return appinfos.size();
	}

	public Object getItem(int position) {
		// TODO Auto-generated method stub
		return appinfos.get(position);
	}

	public long getItemId(int position) {
		// TODO Auto-generated method stub
		return position;
	}

/**
 * View convertView (转化view对象 ,历史view对象的缓存) convertview 就是拖动的时候被回收掉的view对象
 */
	public View getView(int position, View convertView, ViewGroup parent) {
		AppInfo info = appinfos.get(position);
		View view;
		if (convertView == null) {
			 Log.i(TAG,"通过资源文件 创建view对象");
			view = View.inflate(context, R.layout.app_item, null);
		} else {
			 Log.i(TAG,"使用历史缓存view对象");
			view = convertView;
		}
		iv = (ImageView) view.findViewById(R.id.iv_app_icon);
		tv = (TextView) view.findViewById(R.id.tv_app_name);
		iv.setImageDrawable(info.getIcon());
		tv.setText(info.getAppname());
		return view;

	}
}

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android优化listview