尝试突出显示GridView中的选定项目 [英] Trying to highlight a selected item from a GridView
问题描述
我有一个Gridview，当我按某个元素时，我想绘制背景。
我有一个适配器来加载gridview元素。我在该适配器上有一个监听器。
在那个监听器上，我把背景放在我想要的颜色上，但是它也画了列表中的另一个元素（我认为在重新加载视图之后，具有相同位置的元素）。
重要提示：我的最小API为9，我无法改变它。
以下是我的getView方法（从适配器）：
@Override
public View getView（int position，View convertView，ViewGroup parent） {
viewHolder = null;
if（convertView == null）{
viewHolder = new ViewHolder（）;
LayoutInflater layoutInflater =（LayoutInflater）activity.getSystemService（Context.LAYOUT_INFLATER_SERVICE）;
view = layoutInflater.inflate（R.layout.highwayappselectionitem，parent，false）;
viewHolder.appImageIcon =（ImageView）view.findViewById（R.id.highwayGridViewItemIcon）;
viewHolder.appNameLabel =（TextView）view.findViewById（R.id.highwayGridViewItemName）;
viewHolder.appInfoButton =（ImageView）view.findViewById（R.id.highwayGridViewItemInfoButton）;
viewHolder.linearLayout =（LinearLayout）view.findViewById（R.id.HighwayGridViewItem）;
} else {
view = convertView;
viewHolder =（ViewHolder）convertView.getTag（）;
}
viewHolder.appNameLabel.setText（appsList.get（position）.getAppName（））;
viewHolder.appImageIcon.setImageDrawable（appsList.get（position）.getImageIcon（））;
view.setTag（viewHolder）;
viewHolder.linearLayout.setOnClickListener（new MyOnClickListener（position，0））;
返回视图;
}
这里是linearlayout的监听器（代表每个项目）：
public void onClick（View v）{
if（selectedView == 0 || selectedView == 1）{
appName = appsList.get（position）.getAppName（）;
filePath = appsList.get（position）.getFilePath（）;
appLogo = appsList.get（position）.getImageIcon（）;
v.setBackgroundColor（activity.getResources（）。getColor（R.color.light_grey））;
System.out.println（刚按下应用程序...+ appName）;
System.out.println（他的filePath是...+ filePath）;
HighwayGridViewAppItem tmpSelectedItem = new HighwayGridViewAppItem（appLogo，appName，filePath）;
selectedAppsList.add（tmpSelectedItem）;
System.out.println（AppSelectionCUstomAdapter：添加了一个新的应用程序到选定的应用程序列表。!!!!!!!!!!!!!!! ....... ..）;
System.out.println（AppselectioncustomAdaptaer：selectedAppsList的大小现在是：+ selectedAppsList.size（））;
} else {
//按下信息按钮
System.out.println（稍后将实现，需要访问web服务）;
忽略if（选择的视图== 0或== 1它不再被使用，我可以删除它......）。
另外，appsLIst是我自定义类项目的列表。我有一个布尔属性来表示它是否被选中。
发生什么是，想象这个gridview：
ABC
DEF
GHI p>
JKL
灰线表示滚动条...如果滚动显示那些新元素。
如果我按B，它会选择B，但它也会选择H。
我试图做研究，但是我发现的问题并不相同。
有些东西可能会帮助.. gridview用于添加重复elemetns，所以当我添加元素到gridview我检查元素列表是否已经有类似元素，如果是的话，我不添加它。
解决方案
在你选择一些gridview项目后，你需要添加这行。
$ b （（BaseAdapter）gridView.getAdapter（））。notifyDataSetChanged（）;
编辑我认为getView方法存在问题，重复值：
public View getView（int position，View convertView，ViewGroup parent）{
View view = convertView;
if（view == null）{//如果它没有被回收，则初始化一些属性
LayoutInflater inflater =（LayoutInflater）mContext.getSystemService（Context.LAYOUT_INFLATER_SERVICE）;
view = inflater.inflate（R.layout.highwayappselectionitem，parent，false）;
}
}
I have a Gridview and when i press a certain element, i want paint the background.
I have an adapter to load the gridview elements dinamically. And i have a listener on that adapter.
On that listener, i put the background with the color that i want, but then it also paints another element down the list (i guess the one with the same position, after the view is reloaded).
Important : My minimum API is 9, and i can't really change it.
Here is the code for my getView method (from the adapter) :
@Override
public View getView(int position, View convertView, ViewGroup parent) {
viewHolder = null;
if (convertView == null) {
viewHolder=new ViewHolder();
LayoutInflater layoutInflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view=layoutInflater.inflate(R.layout.highwayappselectionitem,parent, false);
viewHolder.appImageIcon=(ImageView) view.findViewById(R.id.highwayGridViewItemIcon);
viewHolder.appNameLabel=(TextView) view.findViewById(R.id.highwayGridViewItemName);
viewHolder.appInfoButton = (ImageView) view.findViewById(R.id.highwayGridViewItemInfoButton);
viewHolder.linearLayout = (LinearLayout) view.findViewById(R.id.HighwayGridViewItem);
}else{
view= convertView;
viewHolder = (ViewHolder) convertView.getTag();
}
viewHolder.appNameLabel.setText(appsList.get(position).getAppName());
viewHolder.appImageIcon.setImageDrawable(appsList.get(position).getImageIcon());
view.setTag(viewHolder);
viewHolder.linearLayout.setOnClickListener(new MyOnClickListener(position,0));
return view;
}
and here is the listener for the linearlayout (that represents each item):
public void onClick(View v) {
if(selectedView==0 || selectedView==1){
appName=appsList.get(position).getAppName();
filePath=appsList.get(position).getFilePath();
appLogo=appsList.get(position).getImageIcon();
v.setBackgroundColor(activity.getResources().getColor(R.color.light_grey));
System.out.println("Just pressed the app ... "+appName);
System.out.println("His filePath is ... "+filePath);
HighwayGridViewAppItem tmpSelectedItem= new HighwayGridViewAppItem(appLogo, appName, filePath);
selectedAppsList.add(tmpSelectedItem);
System.out.println("AppSelectionCUstomAdapter : Added a new application to the list of selected apps .!!!!!!!!!!!!!!!.........");
System.out.println("AppselectioncustomAdaptaer : The size of the selectedAppsList is now : "+selectedAppsList.size());
}else{
//pressed the info button
System.out.println("This will be implemented later, need access to the webservices");
}
}
}
ignore the if(selected view ==0 or ==1 it is not being used anymore, i can delete it... ).
Also, appsLIst is a list my custom class of items. There i have a boolean attribute to represent if it is selected or not.
WHat is happening is , imagine this gridview:
A B C
D E F
G H I
J K L
The grey line represents the scroll... if scroll those new elements show up.
If i press B, it selects B, but it also selects H.
I tried to do research but the problems that I found weren't the same.
Something that might help.. the gridview used to add repeated elemetns, so when i add the elements to the gridview i check if the list of elements already has a similar element, if so i dont add it.
解决方案 You need to add this line when you want to keep selected some item of gridview after selection.
((BaseAdapter) gridView.getAdapter()).notifyDataSetChanged();
Edit I think there is problem in getView method that's why you are getting duplicate values:
public View getView(int position, View convertView, ViewGroup parent) {
View view = convertView;
if (view== null) { // if it's not recycled, initialize some attributes
LayoutInflater inflater = (LayoutInflater) mContext.getSystemService( Context.LAYOUT_INFLATER_SERVICE );
view = inflater.inflate(R.layout.highwayappselectionitem, parent, false);
}
}
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