在android系统xamarin ListView和评价吧 [英] listview and rating bar in android xamarin
问题描述
我有一个列表视图中，每个项目都有一个文本视图和评价吧。
项目布局是：
I have a list view , each item has a text view and a rating bar. the Item layout is :
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:minHeight="50dp"
android:orientation="horizontal">
<TextView
android:id="@+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:lineSpacingExtra="3dp"
android:paddingRight="10dp"
android:paddingTop="5dp"
android:textColor="#ffffff"
android:textStyle="bold"
android:textSize="15sp"
android:typeface="sans"
android:layout_alignParentRight="true"/>
<RatingBar android:id="@+id/ratingbar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/name"
android:numStars="5"
android:stepSize="1.0"
android:layout_alignParentLeft="true" />
</RelativeLayout>
这是我ListAdapter的GetView方法：
this is GetView method of my ListAdapter:
public override View GetView(int position, View convertView, ViewGroup parent)
{
View view = convertView;
RatingBar rate;
if (view == null)
view = context.LayoutInflater.Inflate(Resource.Layout.QuestionListViewItemLayout, parent, false);
// view = context.LayoutInflater.Inflate(Android.Resource.Layout.SimpleListItemActivated1, parent, false);
question item = this[position];
view.FindViewById<TextView>(Resource.Id.name).Text = item.text;
view.FindViewById<RatingBar>(Resource.Id.ratingbar).Rating = item.userrate;
RatingBar rb = view.FindViewById<RatingBar>(Resource.Id.ratingbar);
rb.RatingBarChange += (o, e) =>
{
item.userrate = System.Convert.ToInt32( e.Rating);
};
//view.FindViewById<TextView>(Resource.Id.SanadNumber).Text = item.sanadNumber.ToString();
return view;
}
在该行：rb.RatingBarChange当我改变了ratingbars之一在我的列表视图中的一些其他项目的变化。该委托执行铁道部超过一次，每次我设置的评级我的评价之一吧。
in the line : "rb.RatingBarChange " when I change one of the ratingbars in my list view some other items are change. that delegate execute mor than one time each time I set rating for one of my rating bar.
所以，当我读到它通过评价栏主编的item.userrate，没有正确的答案。
so when I read " item.userrate" which edited by rating bar , there is not correct answer.
推荐答案
我想在我的列表视图有问题（S）的列表。
的问题类是这样的：
I want to have a list of Question(s) in my list view. the question class is like this:
public class question
{
public int id { get; set; }
public string text { get; set; }
public int questionorder { get; set; }
public int userrate { get; set; }
public question()
{
userrate = 0;
}
}
现在我需要一个QuestionListViewItemLayout.axml文件我的样式列表视图：
now I need a "QuestionListViewItemLayout.axml" file for styling my list view:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:minHeight="50dp"
android:orientation="horizontal">
<TextView
android:id="@+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:lineSpacingExtra="3dp"
android:paddingRight="10dp"
android:paddingTop="5dp"
android:textColor="#ffffff"
android:textStyle="bold"
android:textSize="15sp"
android:typeface="sans"now
android:layout_alignParentRight="true"/>
<RatingBar android:id="@+id/ratingbar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/name"
android:numStars="5"
android:stepSize="1.0"
android:layout_alignParentLeft="true" />
</RelativeLayout>
现在我需要一个ListAdapter来管理我的列表视图项，但首先我必须创建一个包装类保存视图：
now I need a ListAdapter to manage Items in my List view, but first I have to create a Wrapper class to save views :
public class ViewWrapper : Java.Lang.Object
{
View base1;
RatingBar rate = null;
TextView label = null;
public ViewWrapper(View base1)
{
this.base1 = base1;
}
public RatingBar getRatingBar()
{
if (rate == null)
{
rate = base1.FindViewById<RatingBar>(Resource.Id.ratingbar);
}
return (rate);
}
public TextView getLabel()
{
if (label == null)
{
label = base1.FindViewById<TextView>(Resource.Id.name);
}
return (label);
}
}
本类创建只是我的问题类，也许你需要创建您自己的包装相似，上面的代码
this class created just for my question class and maybe you need to create your own wrapper similar to above code
是时候创建列表适配器类：
it's time to create List adapter class :
public class QuestionListAdapter : BaseAdapter<question>
{
Activity context;
List<question> list;
public QuestionListAdapter(Activity _context, List<question> _list)
: base()
{
this.context = _context;
this.list = _list;
}
public override int Count
{
get { return list.Count; }
}
public override long GetItemId(int position)
{
return position;
}
public List<question> GetList()
{
return list;
}
public override question this[int index]
{
get { return list[index]; }
}
public override View GetView(int position, View convertView, ViewGroup parent)
{
View view = convertView;
ViewWrapper wrapper;
RatingBar rate;
question item = this[position];
if (view == null)
{
view = context.LayoutInflater.Inflate(Resource.Layout.QuestionListViewItemLayout, parent, false);
wrapper = new ViewWrapper(view);
view.SetTag(Resource.Id.holder, wrapper);
rate = wrapper.getRatingBar();
rate.RatingBarChange += (o, e) =>
{
RatingBar ratingBar = o as RatingBar;
int myPosition = (int)ratingBar.GetTag(Resource.Id.holder);
question model = list[myPosition];
model.userrate = System.Convert.ToInt32(e.Rating);
};
}
else
{
wrapper = (ViewWrapper)view.GetTag(Resource.Id.holder);
rate = wrapper.getRatingBar();
}
question model1 = list[position];
wrapper.getLabel().Text = model1.text;
rate.SetTag(Resource.Id.holder, position);
rate.Rating = model1.userrate;
return view;
}
每一个视图中创建时间，我为它创建一个包装，放入视图标签
节：[IF（查看== NULL）
，并为评级酒吧利率变化事件
each time a view created I create a wrapper for it and put it into view's tag Section : [if (view == null)] and set an event for rating bar rate changes.
其他时间查看负荷。我得到的标签，并设置等级栏的评级表吧。
other time the view loads I get the tag and set the rating of rating bar form it.
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