Question

我无法使用textinvite访问我的Listfragment类的onActivityCreated（）中的textview getListView().findViewById(R.id.invitetext)。它返回null。我究竟做错了什么？我已经在SO上发了很多帖子，但答案对我不起作用。

PhoneContactsListFragment.java：

public class PhoneContactsListActivity extends FragmentActivity implements
        PhoneContactsListFragment.OnContactsInteractionListener {
@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_phone_contact_list);
...
}

activity_phone_contact_list.xml：

<fragment xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/phone_contact_list"
    android:name="com.example.proj.PhoneContactsListFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

PhoneContactsListFragment.java：

public class PhoneContactsListFragment extends ListFragment implements
        AdapterView.OnItemClickListener, LoaderManager.LoaderCallbacks<Cursor> {
@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
...
}

 @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        return inflater.inflate(R.layout.contact_list_fragment, container, false);
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
setListAdapter(mAdapter);
      if(getListView().findViewById(R.id.textinvite)==null)Log.d("Faizal","can't find invitetext");
...
}

private class ContactsAdapter extends CursorAdapter implements SectionIndexer {
...
 @Override
        public View newView(Context context, Cursor cursor, ViewGroup viewGroup) {
        final View itemLayout =
                    mInflater.inflate(R.layout.phone_contact_list_item, viewGroup, false);
...
return itemLayout;
}

contact_list_fragment.xml：

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

    <ListView android:id="@id/android:list"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              style="@style/ContactListView"/>

    <TextView android:id="@id/android:empty"
              android:gravity="center"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:text="@string/no_contacts"
              android:fontFamily="sans-serif-light"
              android:textAppearance="?android:attr/textAppearanceLarge"/>

</FrameLayout>

phone_contact_list_item.xml ：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:layout_width="match_parent"
                android:layout_height="?android:attr/listPreferredItemHeight"
                style="@style/listViewActivatedStyle">

    <TextView android:id="@android:id/text2"
              android:paddingLeft="@dimen/listview_item_padding"
              android:paddingRight="@dimen/listview_item_padding"
              android:layout_width="wrap_content"
              android:layout_height="26dp"
              android:layout_toRightOf="@android:id/icon"
              android:layout_alignParentBottom="true"

              android:fontFamily="sans-serif"
              android:singleLine="true"
              android:ellipsize="marquee"
              android:textAppearance="?android:attr/textAppearanceSmall"/>

    <TextView android:id="@android:id/text1"
              android:paddingLeft="@dimen/listview_item_padding"
              android:paddingRight="@dimen/listview_item_padding"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:layout_above="@android:id/text2"
              android:layout_toRightOf="@android:id/icon"
              android:gravity="center_vertical"
              android:layout_alignParentRight="true"
              android:layout_alignParentTop="true"
              android:layout_alignWithParentIfMissing="true"
              android:fontFamily="sans-serif-light"
              android:singleLine="true"
              android:ellipsize="marquee"
              android:textAppearance="?android:attr/textAppearanceLarge"/>

    <TextView android:id="@+id/textinvite"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:background="#FFFF0000"
              android:layout_alignParentBottom="true"
              android:layout_alignParentRight="true"
              android:fontFamily="sans-serif"
              android:singleLine="true"
              android:ellipsize="marquee"
              android:text="@string/invite"
              android:gravity="right"
              android:layout_gravity="right"
              android:visibility="gone"
              android:clickable="true"
              android:textAppearance="?android:attr/textAppearanceSmall"/>

</RelativeLayout>

Answer 1

R.id.textinvite R.layout phone_contact_list_item内的不在R.layout.contact_list_fragment内。

Answer 2

以下是 TextView ，其中 textinvite 几乎位于 phone_contact_list_item 中..您已经尝试查找该TextView的ID在 contact_list_fragment ..这就是原因。

Answer 3

试试这种方式

  @Override
   public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
   View rootView = inflater.inflate(R.layout.contact_list_fragment, container, false);


  .....getListView().findViewById(R.id.textinvite).....
 return rootView;
   }

findViewById在Listfragment中返回null

3 个答案: