Question

我创建了3个片段java文件，并使用TabsPager文件来刷片段。现在我在StoreHomeFragment.java上添加了工作代码，添加到storehomefragment的代码是填充到gridview的集合

但现在我在TabsPager

中遇到错误

TabsPagerAdapterStore.java

public class TabsPagerAdapterStore extends FragmentPagerAdapter {

public TabsPagerAdapterStore(FragmentManager fm) {
    super(fm);
}

@Override
public Fragment getItem(int index) {

    switch (index) {
    case 0: return new StoreGenreFragment();
    case 1: return new StoreHomeFragment(); //this line error 
    case 2: return new StoreStepFragment();
    }

    return null;
}

@Override
public int getCount() {
    // get item count - equal to number of tabs
    return 3;
}}

在＆＃34;案例1＆＃34;弹出上面的错误。我使用右键单击和快速修复

Change method return type to StoreHomeFragment

我已经上传了图片，只是显示错误弹出，如果我选择那个，然后切换案例中的每个其他片段都会出错，请任何人帮我解决我可能犯的错误

StoreHomeFragment.java中存在的代码

public class StoreHomeFragment extends Fragment {

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

    View rootView = inflater.inflate(R.layout.store_home, container, false);

    if (android.os.Build.VERSION.SDK_INT > 9) {
        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
        StrictMode.setThreadPolicy(policy);
    }


    // Gridview
    final GridView gridView1 = (GridView)rootView.findViewById(R.id.store_home_gridview); 

    String url = "http://192.168.1.132/Android/App/good.php";

    try {
        JSONArray data = new JSONArray(getJSONUrl(url));

        final ArrayList<HashMap<String, String>> MyArrList = new ArrayList<HashMap<String, String>>();
        HashMap<String, String> map;

        for(int i = 0; i < data.length(); i++){
            JSONObject c = data.getJSONObject(i);
            map = new HashMap<String, String>();
            map.put("name", c.getString("name"));
            map.put("artist", c.getString("artist"));
            map.put("price", c.getString("price"));
            map.put("image", c.getString("image"));


            MyArrList.add(map);
        }           

        //gridView1.setAdapter(new ImageAdapter(this,MyArrList));
        gridView1.setAdapter(new ImageAdapter(this,MyArrList));

    } catch (JSONException e) {

        e.printStackTrace();
    } catch (Exception e) {

        e.printStackTrace();
    }
    return rootView;    
}

Answer 1

检查StoreHomeFragment是否扩展Fragment，如果使用支持库，请检查类导入，因为Fragment类也包含在支持库中。实际上，您必须导入在Fragment或StoreGenreFragment

中使用的相同StoreStepFragment课程

我在Android java文件中使用Fragment，Tabspager时出错

1 个答案: