如果每个列表视图有多个textview,如何设置适配器?

时间:2012-06-19 17:43:04

标签: android android-layout android-listview

我的TextView每个列表项都有多个ListView个。我已经学会了编写一个我认为合适的getView方法,但我不确定我是否使用setAdapter来调用该方法。

private static String[] project = {"proj1","proj2"};
private static String[] workRequests = {"requirement gathering", "design"};
private static String[] startDate = {"02/21/2012","07/15/2011"};
private static String[] status = {"WIP","DONE"};

ListView mListView;

public class MyDashboardActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.mydashboard);

        final LayoutInflater mInflater = LayoutInflater.from(this);
        mListView = (ListView)findViewById(R.id.dashboardList);
        mListView.setAdapter(
                // How do I set the adapter?
                );
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        System.out.println("enters");
        if(convertView == null){
            convertView = LayoutInflater.from(this).inflate(R.layout.mydashboard,null);
        }

        ((TextView) convertView.findViewById(R.id.project)).setText(project[position]);
        ((TextView) convertView.findViewById(R.id.work_request)).setText(workRequests[position]);
        ((TextView) convertView.findViewById(R.id.start_date)).setText(startDate[position]);
        ((TextView) convertView.findViewById(R.id.status)).setText(status[position]);

        return convertView;
    }

这是xml布局:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/home_root"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <!-- Include Action Bar -->
    <include layout="@layout/actionbar_layout" />

    <ListView
        android:id="@+id/dashboardList"
        style="@style/LeftHeaderText"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dp"
        android:background="@drawable/innerdashboard_bg"
        android:textColor="@color/textColor" >

        <TextView android:id="@+id/project" />

        <TextView android:id="@+id/work_request" />

        <TextView android:id="@+id/start_date" />

        <TextView android:id="@+id/status" />

    </ListView>

</LinearLayout>

我尝试了几种方法,但没有一种方法可行。有人可以建议在这种情况下如何设置适配器?谢谢!

3 个答案:

答案 0 :(得分:18)

您需要实现自己的适配器。我的方法是定义一个“代表”视图的对象。

下面是一个非常简单的示例,其中包含两个TextViews以满足您的需求。

表示视图的对象(ListView中的一行):

public class CustomObject {

    private String prop1; 
    private String prop2;

    public CustomObject(String prop1, String prop2) {
        this.prop1 = prop1;
        this.prop2 = prop2;
    }

    public String getProp1() {
        return prop1;
    }

    public String getProp2() {
       return prop2;
    }
}

接下来是自定义适配器:

public class CustomAdapter extends BaseAdapter {

   private LayoutInflater inflater;
  private ArrayList<CustomObject> objects;

   private class ViewHolder {
      TextView textView1;
      TextView textView2;
   }

   public CustomAdapter(Context context, ArrayList<CustomObject> objects) {
      inflater = LayoutInflater.from(context);
      this.objects = objects;
   }

   public int getCount() {
      return objects.size();
   }

   public CustomObject getItem(int position) {
      return objects.get(position);
   }

   public long getItemId(int position) {
      return position;
   }

   public View getView(int position, View convertView, ViewGroup parent) {
      ViewHolder holder = null;
      if(convertView == null) {
         holder = new ViewHolder();
         convertView = inflater.inflate(R.layout.your_view_layout, null);
         holder.textView1 = (TextView) convertView.findViewById(R.id.id_textView1);
        holder.textView2 = (TextView) convertView.findViewById(R.id.list_id_textView2);
         convertView.setTag(holder);
      } else {
         holder = (ViewHolder) convertView.getTag();
      }
      holder.textView1.setText(objects.get(position).getprop1());
      holder.textView2.setText(objects.get(position).getprop2());
      return convertView;
   }
}

现在,您可以在活动中定义和设置适配器:

ArrayList<CustomObject> objects = new ArrayList<CustomObject>();
CustomAdapter customAdapter = new CustomAdapter(this, objects);
listView.setAdapter(customAdapter);

现在您只需要在对象列表中管理您的CustomObject。 如果要在ListView上重新执行修改,请不要忘记调用customAdapter.notifyDataSetChanged()

答案 1 :(得分:4)

您的getView()代码需要进入扩展BaseAdapter或其子类之一的类。

执行此操作的一种方法是在MyDashboardActivity中创建私有类。下面是一个快速示例(需要一些额外的代码)。您可能还希望自定义对象将要显示的所有内容关联到一个列表项中。不是多个数组,而是拥有一个自定义类型的数组,该数组具有您要跟踪的每个值的属性。

还有一件事:你的四个TextView应该进入他们自己的布局文件(参见list_item.xml here)。该项目布局文件通过自定义适配器的构造函数连接起来(我在下面的代码中添加了注释以突出显示此内容)。

protected CustomAdapter mAdapter;

public class MyDashboardActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.mydashboard);

        final LayoutInflater mInflater = LayoutInflater.from(this);
        mListView = (ListView)findViewById(R.id.dashboardList);

        mAdapter = new CustomAdapter(this, <array to be adapted>);
        mListView.setAdapter(mAdapter);
    }

    private class CustomAdapter extends ArrayAdapter<String> {

        protected Context mContext;
        protected ArrayList<String> mItems;

        public CustomAdapter(Context context, ArrayList<String> items) {
            super(context, R.layout.custom_list_item, items); // Use a custom layout file
            mContext = context;
            mItems = items;
        }

        public View getView(int position, View convertView, ViewGroup parent) {
            System.out.println("enters");
            if(convertView == null){
                convertView = LayoutInflater.from(this).inflate(R.layout.mydashboard,null);
            }

            // You'll need to use the mItems array to populate these...
            ((TextView) convertView.findViewById(R.id.project)).setText(project[position]);
            ((TextView) convertView.findViewById(R.id.work_request)).setText(workRequests[position]);
            ((TextView) convertView.findViewById(R.id.start_date)).setText(startDate[position]);
            ((TextView) convertView.findViewById(R.id.status)).setText(status[position]);

            return convertView;
        }
    }
}

答案 2 :(得分:2)

有几种方法可以做到这一点。我将告诉你我的方式包含两个布局,第一个是ListView自己的,另一个是文本应该如何显示每个列表项。

listset.xml

First([num]) OVER (Previous([rid])) as [check]

listitems.xml(您也可以将图片放在这里,这里的想法是控制)

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

    <ListView
        android:id="@+id/shipMenu"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>

上面我还没有艺术品,但我打算为图标添加一个ImageView(你也可以添加更多的TextView)。这是我的自定义适配器类。

ListAdapter.java

<?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="fill_parent"
    android:orientation="horizontal">

    <TextView
        android:id="@+id/makerID"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="10dp"
        android:textSize="25dp"/>

</LinearLayout>

在您的主要活动档案集

class ListAdapter extends ArrayAdapter <String>
{

    public ListAdapter(Context context, String[] values) {

        super(context, R.layout.listitems, values); //set the layout that contains your views (not the one with the ListView)
    }

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

        LayoutInflater inflater = LayoutInflater.from(getContext());
        View view = inflater.inflate(R.layout.listitems, parent, false); //same here.

        String text = getItem(position);

        TextView makerID = (TextView) view.findViewById(R.id.makerID);
        makerID.setText(text);

        return view;
    }

}

将其添加到与setContentView()

相同的括号中
setContentView (R.layout.listset);

修改

我在派对上看起来有点迟了但也许这会对某人有所帮助。