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;
privateint
selectIndex = -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。

}
});