如果每个列表视图有多个文本视图，如何设置适配器? [英] How to set adapter in case of multiple textviews per listview?

问题描述

我的 ListView 中的每个列表项都有多个 TextView.我已经学会了编写正确的 getView 方法，但我不确定我是否使用 setAdapter 来调用该方法.

I have a multiple TextViews per list item in my ListView. I've learned to write a proper getView method I believe but I'm not sure ho do I use setAdapter to call that method.

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，但都没有奏效.谁能建议如何在这种情况下设置适配器?谢谢！

I've tried a few ways, none of which worked. Could anyone please suggest how to set the adapter in this case? Thanks!

推荐答案

您需要实现自己的 Adapter.我的方法是还定义一个代表"视图的对象.

You need to implement your own Adapter. My way is to also define an object which "represents" a view.

下面是一个非常简单的例子，有两个 TextViews 来满足您的需求.

Below, there is a very simple example with two TextViews to fit your needs.

代表一个视图的对象(ListView中的一行):

The object which represents a view (a row in the ListView) :

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:

Next the custom adapter :

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;
   }
}

现在您可以在您的活动中定义和设置您的适配器:

Now you can define and set your adapter in your activity :

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

现在您只需在对象列表中管理您的自定义对象.当您想对 ListView 进行重新修改时，不要忘记调用 customAdapter.notifyDataSetChanged().

Now you only have to manage your CustomObject's in the objects list. Don't forget to invoke customAdapter.notifyDataSetChanged() when you want repercute modifications on the ListView.

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