findViewById返回片段空(findViewById returns null in fra

2019-09-01 23:14发布

我必须使用findViewByID methond在片段的问题。

在所说的纺丝器Spinner spinner = (Spinner) view.findViewById(R.id.tabsearchspinner_location); 总是空。 请参阅下面的代码。

public class FragmentTabSearch extends SherlockFragment implements OnItemSelectedListener {

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

    Spinner spinner = (Spinner) view.findViewById(R.id.tabsearchspinner_location);
    ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this.getSherlockActivity(), R.array.spinner_location, android.R.layout.simple_spinner_item);
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    spinner.setAdapter(adapter);

    return view;
}

@Override
public void onItemSelected(IcsAdapterView<?> parent, View view,
        int position, long id) {
    // TODO Auto-generated method stub

}

@Override
public void onNothingSelected(IcsAdapterView<?> parent) {
    // TODO Auto-generated method stub

}

}

布局文件是如下(PS:我已宣布中的值/ ids.xml文件中的ID / tabsearchspinner_location): <item type="id" name="tabsearchspinner_location"></item>

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

<Spinner
    android:id="@id/tabsearchspinner_location"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

<ListView
    android:id="@id/tablistview_search"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >
</ListView>

任何帮助表示赞赏!

Answer 1:

虚增您View没有ViewGroup ,因为它只是你的FragmentActivity内:

View view = inflater.inflate(R.layout.fragment_tab_suggestions, null);

而标识的方式是在XML布局文件内添加是这样的:

android:id="@+id/tabsearchspinner_location"

正如你所看到的,你错过了+



Answer 2:

对不起,我刚刚发现我夸大了错误的布局,所以findViewById方法始终返回null,感谢所有帮助,但。



文章来源: findViewById returns null in fragment