[英]How can i inflate three layouts in ListView?
我有一个自定义listView,我想在其中充气三种不同的布局。
我看过很多问题,但是它们都是奇数和偶数位置,但是在我的listView中,应该夸大到listView的布局取决于其他条件及其动态变化,例如
如果(i == 0)我得到第一个要放大的布局,如果(i == 1)我得到了第二个,依此类推,
变量“ i”等于我将从主活动获得的值。
public class SocialListAdapter extends ArrayAdapter<Item> {
private Activity activity;
private List<Item> items;
private Item objBean;
private int row;
private int i;
public SocialListAdapter(Activity act, int resource, List<Item> arrayList) {
super(act, resource, arrayList);
// TODO Auto-generated constructor stub
this.activity= act;
this.items = arrayList;
this.row = resource;
}
@Override
public int getViewTypeCount() {
return 2;
}
@Override
public int getItemViewType(int position) {
return position;
}
@Override
public int getCount() {
return items.size();
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
View view = convertView;
ViewHolder holder;
objBean = items.get(position);
i = objBean.getI();
if (view == null) {
LayoutInflater inflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if(i == 0){
view = inflater.inflate(R.layout.list, null);
} else if (i == 1){
view = inflater.inflate(R.layout.row1, null);
}
holder = new ViewHolder();
view.setTag(holder);
} else {
holder = (ViewHolder) view.getTag();
}
我尝试了此代码,但工作正常……
滚动listView arrayoutofbondexception时出现错误
getItemViewType
必须返回从0到getViewTypeCount
。
尝试这个 :
public class CustomAdapter extends BaseAdapter {
private ArrayList<String> comments;
Context mContext;
public CustomAdapter(Context context, ArrayList<String> comments) {
this.mContext = context;
this.comments = comments;
}
public View getView(final int position, View convertView, ViewGroup parent){
String item = comments.get(position);
if (getItemViewType(position) == 0) {
View v = convertView;
if (v == null) {
//GET View 1
LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
ViewGroup viewGroup = (ViewGroup)inflater.inflate(R.layout.item_comment2, null);
v = viewGroup;
}
//Fill Data for Ist view
TextView comm = (TextView) v.findViewById(R.id.comment);
comm.setText(item);
return v;
} else if (getItemViewType(position) == 1) {
View v = convertView;
if (v == null) {
//GET View 2
LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
ViewGroup viewGroup = (ViewGroup)inflater.inflate(R.layout.item_comment1, null);
v = viewGroup;
}
//Fill Data for IInd view
TextView comm = (TextView) v.findViewById(R.id.comment);
comm.setText(item);
return v;
} else {
//GET View 3
View v = convertView;
if (v == null) {
LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
ViewGroup viewGroup = (ViewGroup)inflater.inflate(R.layout.item_comment3, null);
v = viewGroup;
}
//Fill Data for IInd view
TextView comm = (TextView) v.findViewById(R.id.comment);
comm.setText(item);
return v;
}
}
@Override
public int getCount() {
return comments.size();
}
@Override
public Object getItem(int position) {
return comments.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public int getViewTypeCount() {
return 2;
}
@Override
public int getItemViewType(int position) {
if(position == 0)
return 0;
else if (position == 1)
return 1;
else
return 2;
}
}
您可以优化,使您的滚动顺利通过定义视图持有人:尝试这也
在getItemViewType中,您可以设置要在哪里显示哪种视图类型的条件。
在getView方法中使用“ if(position == 0)”
您可以检查条件并为所需的布局充气。 这是例子。 我根据它分为三个类别,分别为不同的布局充气。
public class ApplicationAdapter extends BaseAdapter
{
private Context cntx;
/**
* 0 - featured 1- Top rated 2- other
*/
private int whichCategory;
/**
* Constructor
*
* @param context
* @param iwhichCategory
* 0 - featured 1- Top rated 2- other
*/
public ApplicationAdapter(Context context, int iwhichCategory)
{
cntx = context;
whichCategory = iwhichCategory;
}
@Override
public int getCount()
{
return entApplications.size();
}
@Override
public Object getItem(int position)
{
return null;
}
@Override
public long getItemId(int position)
{
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent)
{
if (convertView == null)
{
// This a new view we inflate the new layout
LayoutInflater inflater = (LayoutInflater) cntx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (whichCategory == 0)
convertView = inflater.inflate(R.layout.featured_app_grid_item, parent, false);
if (whichCategory == 1)
convertView = inflater.inflate(R.layout.other_app_grid_item, parent, false);
if (whichCategory == 2)
convertView = inflater.inflate(R.layout.other_app_grid_item1, parent, false);
}
}
}
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