[英]ListView in android not saving ratingBar stars
我制作的listView有一個問題,它有一個ratingbar和一個texview元素,它是一個非常簡單的程序,旨在顯示列表並存儲用戶輸入到ratingBar中的星星的值。 不幸的是,由於某種原因,當我上下滾動屏幕中的行時,向后滾動時它們的星號又變回了初始值。下面的代碼。 如果有人可以幫助,那就太好了。 謝謝。
package com.example.test;
import java.util.ArrayList;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.RatingBar;
import android.widget.TextView;
public class MainActivity extends Activity implements RatingBar.OnRatingBarChangeListener {
private String[] textList = {"Pikachu","Raichu","Raticate","Ratata","Absol","Abra","Kadabra","Pidgey","Mime","Meowth","Mew","Squirtle","Blastoise","Goop","Kilobyte","Armada"};
private ArrayList<String> list = new ArrayList<String>();
ListView listView;
protected void onCreate(Bundle icicle)
{
super.onCreate(icicle);
setContentView(R.layout.activity_main);
for(int i=0; i<textList.length; i++)
{
list.add(i,textList[i]);
}
listView = (ListView)findViewById(R.id.listRow);
listView.setAdapter(new setListView(list));
}
class setListView extends ArrayAdapter<String>
{
public setListView(ArrayList<String> list)
{
super(MainActivity.this, R.layout.custom_layout, R.id.text, list);
}
public View getView(int position, View convertView, ViewGroup parent)
{
View row = convertView;
if(convertView == null)
{
LayoutInflater inflater = getLayoutInflater();
row = inflater.inflate(R.layout.custom_layout, parent, false);
}
RatingBar ratingBar = (RatingBar)row.findViewById(R.id.rating);
RatingBarInfo rating;
rating = (RatingBarInfo)ratingBar.getTag();
if(rating == null)
{
rating = new RatingBarInfo(position);
ratingBar.setTag(rating);
}
ratingBar.setRating(rating.getRating());
TextView text = (TextView)row.findViewById(R.id.text);
text.setText(list.get(position));
return(row);
}
}
class RatingBarInfo
{
float rating;
int position;
public RatingBarInfo(int positionTemp)
{
rating = 2.0f;
position = positionTemp;
}
public void setRating(float ratingTemp)
{
rating = ratingTemp;
}
public float getRating()
{
return rating;
}
public int getPosition()
{
return position;
}
}
public void onRatingChanged(RatingBar ratingBar, float rating,boolean fromUser)
{
RatingBarInfo ratingChange = (RatingBarInfo)ratingBar.getTag();
ratingChange.setRating(rating);
ratingBar.setTag(ratingChange);
((ArrayAdapter<String>)listView.getAdapter()).notifyDataSetChanged();
}
}
您忘記在RatingBar上設置OnRatingBarChangeListener。 只要將此行添加到您的getView()方法中,它就可以正常工作。
ratingBar.setOnRatingBarChangeListener(MainActivity.this)
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