Question

我创建了一个android操作栏选项卡应用程序，有4个选项卡，其中一个选项卡是片段类，用于包含列表视图，以显示静态信息列表：

但是，我在这行代码中遇到错误： SimpleAdapter adapter = new SimpleAdapter（getBaseContext（），aList，

 R.layout.listoflockers, from, to);

这些是用于创建列表视图的2 xml文件：

 listoflockers.xml
<?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="vertical" >

   <TextView
      android:id="@+id/textview"
      android:layout_width="fill_parent"
      android:layout_height="wrap_content"
   />

  <ListView
     android:id="@+id/listview"
     android:layout_width="fill_parent"
      android:layout_height="wrap_content"
   />
</LinearLayout>


lockerinforow.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"
 >

<ImageView
    android:id="@+id/flag"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:contentDescription="@string/email"
    android:paddingTop="10dp"
    android:paddingRight="10dp"
    android:paddingBottom="10dp"
 />

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
>
  <TextView
        android:id="@+id/txt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="15dp"
    />

    <TextView
        android:id="@+id/cur"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="10dp"
    />
    <TextView
        android:id="@+id/size"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="10dp"
    />
       </LinearLayout>
    </LinearLayout>


  public class myLockerFragment.java{
   .....

      public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    View rootView = inflater.inflate(R.layout.fragment_mylocker, container,    false);



        List<HashMap<String,String>> aList = new ArrayList<HashMap<String,String>>

             ();        

        for(int i=0;i<10;i++){
              HashMap<String, String> hm = new HashMap<String,String>();

            hm.put("txt", "Locker No : " + i);

            hm.put("cur","Location : " + currency[i]);
            hm.put("size","Size : " + size[i]);

            hm.put("flag", Integer.toString(flags[i]) );            
            aList.add(hm);        
        }

        // Keys used in Hashmap
        String[] from = { "flag","txt","cur","size" };

        // Ids of views in listview_layout
        int[] to = { R.id.flag,R.id.txt,R.id.cur,R.id.size};        

        // Instantiating an adapter to store each items
        // R.layout.listview_layout defines the layout of each item
        SimpleAdapter adapter = new SimpleAdapter(getBaseContext(), aList, 

            R.layout.listoflockers, from, to);

        // Getting a reference to listview of main.xml layout file
        ListView listView = ( ListView ) rootView.findViewById(R.id.listview);
        // Setting the adapter to the listView
        listView.setAdapter(adapter);
            return rootView;
      }

请帮忙我对这一行很困惑：

   SimpleAdapter adapter = new SimpleAdapter(getBaseContext(), aList, 
   R.layout.listoflockers, from, to);

给我错误：对于myLockerFragment类型

，方法getBaseContext（）未定义

Answer 1

您可以在getActivity()中使用Fragment来获取包含片段本身的上下文

Answer 2

这样做 -

SimpleAdapter adapter = new SimpleAdapter(getActivity(), aList, 
   R.layout.listoflockers, from, to);

Answer 3

SimpleAdapter adapter = new SimpleAdapter(getActivity().getApplicationContext(), aList, R.layout.listoflockeres, from, to);

您需要在getActivity()

中使用Fragments方法

Answer 4

除了使用getBaseContext()之外，您还需要使用getActivity()中的Fragments来获取片段的上下文。

试试如下：

  SimpleAdapter adapter = new SimpleAdapter(getActivity(), aList,R.layout.listoflockers, from, to);

Android：在片段内实现listview时出错

4 个答案: