无法在 Android 片段中加载简单的 ListView

Question

我有一个片段包含列表视图、按钮和图像。按钮、图像和其他小部件已正确加载，但不是列表视图，它只显示加载图标

公共类 ListDetails 扩展 SherlockFragment{

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // TODO Auto-generated method stub
         ListView listView = (ListView)container.findViewById(R.id.list_view2);

            // Defined Array values to show in ListView
            String[] values = new String[] { "Android List View", 
                                             "Adapter implementation",
                                             "Simple List View In Android",
                                             "Create List View Android", 
                                             "Android Example", 
                                             "List View Source Code", 
                                             "List View Array Adapter", 
                                             "Android Example List View" 
                                            };

            // Define a new Adapter
            // First parameter - Context
            // Second parameter - Layout for the row
            // Third parameter - ID of the TextView to which the data is written
            // Forth - the Array of data

            ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity().getApplicationContext(),android.R.layout.simple_list_item_1, android.R.id.text1, values);


            // Assign adapter to ListView
            listView.setAdapter(adapter); 
        return inflater.inflate(
                R.layout.listdetails_fragement, container, false);
    }

我检查了其他按钮，图像已加载，但列表视图在我的 ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity().getApplicationContext(),android.R.layout.simple_list_item_1, android.R.id.text1, values); 行 上出现错误

这里我提供了我的 logcat 错误。

Answer 1

这就是我所做的：

我没有在 onCreateView() 中执行所有操作，而是使用了 onActivityCreated()。

在onActivityCreated()中，我刚刚添加了这段代码：下面是实现：

public class Database extends Fragment {

    public ViewPager viewPager;
    private AllPagesAdapter mAdapter;
    private ActionBar actionBar;
    private String[] tabs = { "Tab1", "Tab2" };
    String[] values = new String[] { "Android List View", 
            "Adapter implementation",
            "Simple List View In Android",
            "Create List View Android", 
            "Android Example", 
            "List View Source Code", 
            "List View Array Adapter", 
            "Android Example List View" 
           };
    ArrayAdapter<String> mArrayAdapter; 

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

        View databaseview = inflater.inflate(R.layout.database, container,
                false);



        return databaseview;

    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onActivityCreated(savedInstanceState);

        ListView mListView = (ListView)getActivity().findViewById(R.id.databaselist);

        mArrayAdapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, android.R.id.text1, values);

        mListView.setAdapter(mArrayAdapter);

    }

}

我使用的布局是：

<?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="vertical" >

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical" >
    </LinearLayout>

    <ListView
        android:id="@+id/databaselist"
        android:layout_width="match_parent"
        android:layout_height="254dp" >
    </ListView>

    <TextView
        android:id="@+id/newmainlist"
        android:layout_width="match_parent"
        android:layout_height="250dp"
        android:gravity="center"
        android:text="database" />

</LinearLayout>

另外，这是它的图片：

希望这会有所帮助.. :)

Answer 2

因为这条线的错误..

ListView listView = (ListView)container.findViewById(R.id.list_view2);

这里listview 为空 像这样更改您的代码..

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    View view = inflater.inflate(R.layout.listdetails_fragement, container,
            false);

    ListView listView = (ListView) view.findViewById(R.id.list_view2);

    // Defined Array values to show in ListView
    String[] values = new String[] { "Android List View",
            "Adapter implementation", "Simple List View In Android",
            "Create List View Android", "Android Example",
            "List View Source Code", "List View Array Adapter",
            "Android Example List View" };

    // Define a new Adapter
    // First parameter - Context
    // Second parameter - Layout for the row
    // Third parameter - ID of the TextView to which the data is written
    // Forth - the Array of data

    ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity()
            .getApplicationContext(), android.R.layout.simple_list_item_1,
            android.R.id.text1, values);

    // Assign adapter to ListView
    listView.setAdapter(adapter);
    return view;
}

Answer 3

用这个改变onCreateView(....)

 @Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    // TODO Auto-generated method stub
     View v=inflater.inflate(
            R.layout.listdetails_fragement, container, false);

     ListView listView = (ListView)v.findViewById(R.id.list_view2);

        // Defined Array values to show in ListView
        String[] values = new String[] { "Android List View", 
                                         "Adapter implementation",
                                         "Simple List View In Android",
                                         "Create List View Android", 
                                         "Android Example", 
                                         "List View Source Code", 
                                         "List View Array Adapter", 
                                         "Android Example List View" 
                                        };


        ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity().getApplicationContext(),android.R.layout.simple_list_item_1, android.R.id.text1, values);


        // Assign adapter to ListView
        listView.setAdapter(adapter); 
    return v;
}