关于在Android中如何点击GridView或者ListView中item子项达到修改子项背景的问题解决方案

曾经在项目中遇到过类似的问题。需要修改item子项的背景，达到互斥效果。

首先，写出自己的适配器。Adapter

这里以GridView为目标

1.适配器，每个人的适配器不尽相同，此为我自己写的。

关键代码。

为：

此处就是处理更换背景的代码。在Adapter中的getView方法中可以找到

if( getSelectIndex() == position ){

    viewHolder.item_imageView.setVisibility(View.VISIBLE);

}else{

viewHolder.item_imageView.setVisibility(View.GONE);

}

********************************************************************************************

public class FamousteacherAdapterextends BaseAdapter {

private ArrayList<HashMap<String, Object>>dataList;

private Context context;

private LayoutInflater lf;

private ViewHolder viewHolder = null;

privateintselectIndex = -1;

public int getSelectIndex() {

returnselectIndex;

}

public void setSelectIndex(int selectIndex) {

this.selectIndex = selectIndex;

}

public FamousteacherAdapter(Context context,

ArrayList<HashMap<String, Object>> dataList) {

this.context = context;

this.dataList = dataList;

lf = LayoutInflater.from(context);

}

@Override

public int getCount() {

return dataList.size();

}

@Override

public Object getItem(int arg0) {

return dataList.get(arg0);

}

@Override

public long getItemId(int arg0) {

return arg0;

}

@Override

public View getView(finalint position, View convertView, ViewGroup parent) {

if (null == convertView) {

viewHolder =new ViewHolder();

convertView = lf.inflate(R.layout.settingtopic_list, null);

viewHolder.item_textview = (TextView) convertView

.findViewById(R.id.item_textview);

viewHolder.item_imageView = (ImageView) convertView

.findViewById(R.id.item_imageView);

convertView.setTag(viewHolder);

} else {

viewHolder = (ViewHolder) convertView.getTag();

}

if( getSelectIndex() == position ){

    viewHolder.item_imageView.setVisibility(View.VISIBLE);

}else{

viewHolder.item_imageView.setVisibility(View.GONE);

}

Map map = dataList.get(position);

viewHolder.item_textview.setText( (CharSequence) map.get("itemText"));

return convertView;

}

class ViewHolder {

TextView item_textview;

ImageView item_imageView;

}

}

2.第二步，在你的Activity中，你要实现点击事件。

在点击事件中将点击item的Position传回适配器中。然后通知适配器数据有变化。然后效果就达到了。

famous_course_gridView.setOnItemClickListener(new OnItemClickListener() {

@Override

publicvoid onItemClick(AdapterView<?> arg0, View view,int arg2,

long arg3) {

if(famousteacherAdapter.getSelectIndex()==-1)

{

famousteacherAdapter.setSelectIndex(arg2);

}

else

{

famousteacherAdapter.setSelectIndex(arg2);

}

famousteacherAdapter.notifyDataSetInvalidated();//一定别忘了写这句。

}

});