Question

我从ArrayLists Contacts填充了两个Content Provider：

public class AddBuddiesActivity extends ListActivity 
{
  public ArrayList<String> allNames;
  public ArrayList<String> allNumbers;

  protected void onCreate(Bundle savedInstanceState)
  {
    // initialize and populate these lists
    ...

我设置了一个xml布局来准备显示两个lists。

group_addbuddies.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="horizontal" >

  <TextView
    android:id="@+id/buddy_name"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_weight="1" />

  <TextView
    android:id="@+id/buddy_number"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_weight="1" />

</LinearLayout>

现在我想为adapter设置ListActivity，这样我就可以在两个text views

行中的两个列表中受欢迎

// inside onCreate()
// somehow create an adapter
setListAdapter(adapter);

如何创建custom list adapter buddy_name ArrayList<String> allNames buddy_number和ArrayList<String> allNumbers {/ 1}}？

Answer 1

您应该将两个数组合并为一个数组。它将为您节省很多麻烦，并且更容易适应框架。只需创建一个简单的类来容纳两个字符串（或使用Pair对象，但它不太适合未来，不推荐）。

基于该自定义数据类创建一个类型化数组适配器，覆盖getView并将每个字符串放在相应的TextView中，您就可以了。

class CustomAdapter extends ArrayAdapter<MyData>{

    public CustomAdapter(Context context, int resource) {
        super(context, resource);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        MyData item = getItem(position);

        View view = super.getView(position, convertView, parent);
        ((TextView)view.findViewById(R.id.buddy_name)).setText(item.getName());
        ((TextView)view.findViewById(R.id.buddy_number)).setText(item.getNumber());

        return view;
    }
}

Answer 2

像这样设置ListAdapter

setListAdapter(new CustomListAdapter(getApplicationContext(), allNames, allNumbers));

这是Adapter类

<强> CustomListAdapter.java

import java.util.ArrayList;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

public class CustomListAdapter extends ArrayAdapter<String> {

    private final Context mContext;
    public ArrayList<String> allNames;
    public ArrayList<String> allNumbers;

    public CustomListAdapter(Context mContext, ArrayList<String> allNames,
            ArrayList<String> allNumbers) {
        super(mContext, R.layout.group_addbuddies, allNames);
        this.mContext = mContext;
        this.allNames = allNames;
        this.allNumbers = allNumbers;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder mHolder;

        if (convertView == null) {
            LayoutInflater inflater = (LayoutInflater) mContext
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = inflater.inflate(R.layout.group_addbuddies, parent, false);
            mHolder = new ViewHolder();
            mHolder.buddy_name = (TextView) convertView
                    .findViewById(R.id.buddy_name);
            mHolder.buddy_number = (TextView) convertView
                    .findViewById(R.id.buddy_number);
            convertView.setTag(mHolder);
        } else {
            mHolder = (ViewHolder) convertView.getTag();
        }

        mHolder.buddy_name.setText(allNames.get(position));
        mHolder.buddy_number.setText(allNumbers.get(position));

        return convertView;
    }

    private class ViewHolder {
        private TextView buddy_name;
        private TextView buddy_number;
    }

}

使用两个TextView创建一个自定义ListActivity适配器来处理两个ArrayList <string>对象</string>

2 个答案: