Java: Android: Реализация рейтинга

RatingBar:



<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
>
<RatingBar
android:id="@+id/rate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:numStars="3"
android:stepSize="1"
android:rating="2" />
<TextView
android:id="@+id/label"
android:paddingLeft="2px"
android:paddingRight="2px"
android:paddingTop="2px"
android:textSize="40sp"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
</LinearLayout>

Java:

class ViewWrapper {
View base;
RatingBar rate=null;
TextView label=null;
ViewWrapper(View base) {
this.base=base;
}
RatingBar getRatingBar() {
if (rate==null) {
rate=(RatingBar)base.findViewById(R.id.rate);
}
return(rate);
}
TextView getLabel() {
if (label==null) {
label=(TextView)base.findViewById(R.id.label);
}
return(label);
}
}

public class RateListDemo extends ListActivity {
String[] items={"lorem", "ipsum", "dolor", "sit", "amet",
"consectetuer", "adipiscing", "elit", "morbi", "vel",
"ligula", "vitae", "arcu", "aliquet", "mollis",
"etiam", "vel", "erat", "placerat", "ante",
"porttitor", "sodales", "pellentesque", "augue",
"purus"};
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
ArrayList<RowModel> list=new ArrayList<RowModel>();
for (String s : items) {
list.add(new RowModel(s));
}
setListAdapter(new RatingAdapter(list));
}
private RowModel getModel(int position) {
return(((RatingAdapter)getListAdapter()).getItem(position));
}
class RatingAdapter extends ArrayAdapter<RowModel> {
RatingAdapter(ArrayList<RowModel> list) {
super(RateListDemo.this, R.layout.row, list);
}
public View getView(int position, View convertView,
ViewGroup parent) {
View row=convertView;
ViewWrapper wrapper;
RatingBar rate;
if (row==null) {
LayoutInflater inflater=getLayoutInflater();
row=inflater.inflate(R.layout.row, parent, false);
wrapper=new ViewWrapper(row);
row.setTag(wrapper);
rate=wrapper.getRatingBar();
RatingBar.OnRatingBarChangeListener l=
new RatingBar.OnRatingBarChangeListener() {
public void onRatingChanged(RatingBar ratingBar,
float rating,
boolean fromTouch) {
Integer myPosition=(Integer)ratingBar.getTag();
RowModel model=getModel(myPosition);
model.rating=rating;
LinearLayout parent=(LinearLayout)ratingBar.getParent();
TextView label=(TextView)parent.findViewById(R.id.label);
label.setText(model.toString());
}
};
rate.setOnRatingBarChangeListener(l);
}
else {
wrapper=(ViewWrapper)row.getTag();
rate=wrapper.getRatingBar();
}
RowModel model=getModel(position);
wrapper.getLabel().setText(model.toString());
rate.setTag(new Integer(position));
rate.setRating(model.rating);
return(row);
}
}
class RowModel {
String label;
float rating=2.0f;
RowModel(String label) {
this.label=label;
}
public String toString() {
if (rating>=3.0) {
return(label.toUpperCase());
}
return(label);
}
}
}