Question

在我的活动中，我有一个ListView。在那我试图添加标题视图列表视图看起来不适合我。当我使用addHeaderView()方法添加标题视图时，它会抛出

 java.lang.IllegalStateException: Cannot add header view to list -- setAdapter has already been called

当我评论listView.addHeaderView(header);时，它运行正常。但我在addHeaderview()方法之前调用了setAdapter()方法。我无法弄清楚为什么会出现这个错误。让我知道我的代码中有什么错误。

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_home);
    TextView header= new TextView(this);
    header.setText("Header");
    ListView listView = (ListView)findViewById(R.id.list_view);
    listView.addHeaderView(header);
    List<String> list = new ArrayList<String>();
    for (int i = 0; i < 20; i++) {
        list.add("Row "+i);
    }
    listView.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,list));

Answer 1

我知道了。我在xml文件中添加了android:entries属性。因此setAdapter()方法之前调用了addHeaderView()。

        <ListView
            android:id="@+id/confess_list_view"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:entries="@array/sample_array"
            android:padding="@dimen/medium"
            android:layout_margin="@dimen/medium"
            android:background="#fbf8f8"
            android:scrollbars="none">

        </ListView>

当我从xml中删除android:entries属性时，它的工作正常。谢谢@Bhavik Mehta。

Answer 2

试试这样：

super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
TextView header= new TextView(this);
header.setText("Header");
ListView listView = (ListView)findViewById(R.id.list_view);
listView.addHeaderView(header);
List<String> list = new ArrayList<String>();
for (int i = 0; i < 20; i++) {
    list.add("Row "+i);
}
ArrayAdapter<String> adapter=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,list);
listView.setAdapter(adapter);

Answer 3

这对我有用：

  @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    listView = (ListView) findViewById(R.id.list_id);

    //code to add header and footer to listview
    LayoutInflater inflater = getLayoutInflater();
    ViewGroup header = (ViewGroup) inflater.inflate(R.layout.header, listView,
            false);
    ViewGroup footer = (ViewGroup) inflater.inflate(R.layout.footer, listView,
            false);
    listView.addHeaderView(header, null, false);
    listView.addFooterView(footer, null, false);

    ArrayAdapter adapter = new ArrayAdapter(this,
            android.R.layout.simple_list_item_1, numbers);

    listView.setAdapter(adapter);

}

试图在Android中向ListView添加标题视图但我无法添加

3 个答案: