android listview动态添加item,Android ListView动态刷新某项Item

最新推荐文章于 2024-03-27 19:00:48 发布

转载最新推荐文章于 2024-03-27 19:00:48 发布 · 257 阅读

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这个博客介绍了如何创建一个名为TestListAdapter的自定义适配器，该适配器继承自BaseAdapter，并与List数据集关联。适配器实现了getView方法来填充每个列表项，并通过ViewHolder优化了性能。此外，博客还展示了如何在列表视图中局部更新特定位置的数据，避免了不必要的视图重绘。

public classTestListAdapter extends BaseAdapter {privateContext mContext;private ListstrList;public TestListAdapter(Context context, Listlist) {

super();this.mContext =context;this.strList =list;

}

@Overridepublic intgetCount() {//TODO Auto-generated method stub

returnstrList.size();

}

@Overridepublic Object getItem(intposition) {//TODO Auto-generated method stub

returnposition;

}

@Overridepublic long getItemId(intposition) {//TODO Auto-generated method stub

returnposition;

}

@Overridepublic View getView(intposition, View convertView, ViewGroup parent) {//TODO Auto-generated method stub

ViewHolder holder = null;if (null ==convertView) {

convertView= LayoutInflater.from(mContext).inflate(R.layout.line, null);

holder= newViewHolder();

holder.iDText=(TextView) convertView.findViewById(R.id.textView_id);

holder.strText=(TextView) convertView.findViewById(R.id.textView_str);

convertView.setTag(holder);

}else{

holder=(ViewHolder) convertView.getTag();

}

holder.iDText.setText(position+ "");

String str= strList.get(position);

holder.strText.setText(str);returnconvertView;

}private static classViewHolder {privateTextView iDText;privateTextView strText;

}public void updataView(intposi, ListView listView) {int visibleFirstPosi =listView.getFirstVisiblePosition();int visibleLastPosi =listView.getLastVisiblePosition();if (posi >= visibleFirstPosi && posi <=visibleLastPosi) {

View view= listView.getChildAt(posi -visibleFirstPosi);

ViewHolder holder=(ViewHolder) view.getTag();

String txt=holder.strText.getText().toString();

txt= txt + "++;";

holder.strText.setText(txt);

strList.set(posi, txt);

}else{

String txt= strList.get(posi);

txt= txt + "++;";

strList.set(posi, txt);

}