片段不顯示布局

Question

我有一個這樣的片段 ：

public class ContactFragment extends Fragment {

        @Override
        public void onAttach(Activity activity) {
            super.onAttach(activity);

        }

        @Override
        public void onDetach() {
            super.onDetach();
        }
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
            inflater.inflate(R.layout.contacts_picker_activity, null);

            return super.onCreateView(inflater, container, savedInstanceState);
        }
        @Override
        public void onViewCreated(View view, Bundle savedInstanceState) {

            super.onViewCreated(view, savedInstanceState);
        }
    }

和contacts_picker_activity布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
    <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="this a test "
            android:id="@+id/textView" android:layout_gravity="center"/>
</LinearLayout>

問題是當我運行我的應用程序時， onCreateView方法運行但未顯示布局。
我的logcat中沒有任何錯誤。

Answer 1

試試這個

  @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState)           
    {
        View v=inflater.inflate(R.layout.contacts_picker_activity, null);
        return v;
    }

您應該返回膨脹的View 。

Answer 2

更改

 @Override
 public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
            inflater.inflate(R.layout.contacts_picker_activity, null);

            return super.onCreateView(inflater, container, savedInstanceState);
  }

至

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


          return inflater.inflate(R.layout.contacts_picker_activity, container , false);
 }

您需要返回要在onCreateView中膨脹的視圖

Answer 3

只需返回放大的視圖。

public class ContactFragment extends Fragment {

        @Override
        public void onAttach(Activity activity) {
            super.onAttach(activity);

        }

        @Override
        public void onDetach() {
            super.onDetach();
        }
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
           View v= inflater.inflate(R.layout.contacts_picker_activity, null);

            return v;
        }
        @Override
        public void onViewCreated(View view, Bundle savedInstanceState) {

            super.onViewCreated(view, savedInstanceState);
        }
    }