Question

我创建了一个名为Listing的类：

public class Listing {
    @Key private int id;
    @Key private String name;
    @Key private float lastname;

public String getName() {
    return this.name;
}
public void setName( String name ) {
    this.name = name;
}
public String getLastName() {
    return this.lastname;
}
public void setLastName( String lastname ) {
    this.lastname = lastname;
}

}

我可以创建一个列表数组，我从服务器提取并将其存储在变量中。

然后我基本上可以调用variable[1].getLastName并获得我需要的所有值。

然而，我对将它放在listview中完全感到困惑。有人能指出我正确的方向吗？我发现此页面非常有用http://www.vogella.com/articles/AndroidListView/article.html，但我不确定如何将其与我已有的相关联？

感谢任何和所有帮助！

目前我的设置方式如下。这是我的适配器，主要来自教程：

    private class StableArrayAdapter extends ArrayAdapter<String> {

    HashMap<String, Integer> mIdMap = new HashMap<String, Integer>();

    public StableArrayAdapter(Context context, int textViewResourceId,
        List<String> objects) {
      super(context, textViewResourceId, objects);
      for (int i = 0; i < objects.size(); ++i) {
        mIdMap.put(objects.get(i), i);
      }

    }

    public long getItemId(int position) {
      String item = getItem(position);
      return mIdMap.get(item);
    }

    public boolean hasStableIds() {
      return true;
    }
    String[] values = new String[] {
            "1", "2"
    };
    //the stuff I've commented out in this next section give me nullpointer exception, where listinginfo is the varible I have saved my call to.
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
      LayoutInflater inflater = (LayoutInflater) context
          .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
      // thisListing = listinginfo[position];
      View rowView = inflater.inflate(R.layout.main_cell, parent, false);
      TextView textView = (TextView) rowView.findViewById(R.id.firstline);
      TextView smallerTextView = (TextView) rowView.findViewById(R.id.secondLine);
      //String currentadd = listinginfo[position].getName();
      ImageView imageView = (ImageView) rowView.findViewById(R.id.icon);
      //textView.setText(currentadd);
      //smallerTextView.setText(listinginfo[position].getLastName);
      return rowView;
    }
}

我可以在请求成功的同一方法中调用listinginfo [position] .getLastName。

我也可以在onCreate方法中创建listview，但这只是在我之前生成假数据时：

    //generate fake data for listview
    final ListView listview = (ListView) findViewById(R.id.listview);
    String[] values = new String[] {
            "jon", "jim", "mary"
    };
    final ArrayList<String> list = new ArrayList<String>();
    for (int i = 0;i < values.length;++i){
        list.add(values[i]);
    }

Answer 1

在您提到的教程中，请参阅第3.2节。而不是

String[] values;

在您的适配器中，您将拥有类似

的内容

Listing[] listings;

然后，在适配器的getView（）方法中，您将在TextViews中填入适当的值。类似的东西：

textView.setText(listings[position].getLastName());

试试这个：

public class ListingsAdapter extends BaseAdapter
{
List<Listing> listings;
Context context;
LayoutInflater inflater;

public ListingsAdapter(Context context, List<Listing> listings)
{
    this.context = context;
    this.listings = listings;
    inflater = (LayoutInflater) context.getSystemService
            (Context.LAYOUT_INFLATER_SERVICE);
}

@Override
public View getView(int position, View convertView, ViewGroup parent)
{
    if (convertView == null)
    {
        convertView = inflater.inflate(R.layout.main_cell, parent, false);
    }

    TextView text1 = (TextView) convertView.findViewById(R.id.firstline);
    TextView text2 = (TextView) convertView.findViewById(R.id.secondLine);;

    Listing listing = listings.get(position);

    text1.setText(listing.getName());
    text2.setText(listing.getLastName());

    return convertView;
}

@Override
public int getCount()
{
    // TODO Auto-generated method stub
    return listings.size();
}

@Override
public Object getItem(int arg0)
{
    // TODO Auto-generated method stub
    return null;
}

@Override
public long getItemId(int arg0)
{
    // TODO Auto-generated method stub
    return 0;
}

}

在您的活动中执行此操作：

final ListView listview = (ListView) findViewById(R.id.listview);
ListingsAdapter listingsAdapter = new ListingsAdapter(this, myListings);
listview.setAdapter(listingsAdapter);

我有一个课程，如何有效地将其纳入listview？

1 个答案: