无法解析android.support.v4.app.Fragment(版本21.0.3)Android Studio中的方法getContext() [英] Cannot resolve method getContext() in android.support.v4.app.Fragment (version 21.0.3) Android Studio

问题描述

我来遇到一个问题，我似乎无法理解为什么会这样.使用支持v4库(版本21.0.3)，我的项目中有一些片段.在这些片段中，我使用了getContext()方法来显示Toasts. 但是昨天突然间，我项目中的所有getContext都中断了，Android Studio在编译时向我显示了26个错误.这是坏掉的多个范例之一

I've come accoss a problem that I can't seem seem to understand why it's happening . I've got a few Fragments in my project using the support v4 library (version 21.0.3) . In these fragments I used the getContext() method for example to show Toasts . But yesterday suddently all getContext in my project broke and Android Studio shows me 26 errors while compiling . Here's one of the multiple exemples that broke

    package com.example.project.ui.fragment;


    import android.app.Activity;
    import android.os.Bundle;
    import android.support.v4.app.Fragment;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.AdapterView;
    import android.widget.ArrayAdapter;
    import android.widget.ListView;
    import com.example.project.R;
    import java.util.ArrayList;

    public class ListSizesFragment extends Fragment {

    private ArrayList<String> sizes;

    private ListView listViewSizes;
    private ArrayAdapter<String> adapter;


    public ListSizesFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_list_sizes, container, false);
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        listViewSizes = (ListView) view.findViewById(R.id.listViewBlogs);
        sizes = new ArrayList<>(MAX_SIZES);
        sizes.addAll(getValueSizes())

        adapter = new ArrayAdapter<String>(getContext(), android.R.layout.simple_list_item_1, sizes);
        listViewSizes.setAdapter(adapter);
        listViewSizes.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                String resultSize = adapter.getItem(position);
                Toast.makeText(getContext(),"result :"+resultSize,Toast.LENGHT_SHORT).show();               getActivity().setResult(Activity.RESULT_OK);
                getActivity().finish();
            }
        });
    }
}

根据我在Android文档中看到的内容(

From what I can see in the Android documentation (http://developer.android.com/reference/android/support/v4/app/Fragment.html#getContext()) getContext is a method of the support-v4 Fragment so I'm stuck at trying to figure out what's the problem .

在那个项目中，我也有一个ViewPager，而addOnPageListener方法没有相同的问题.

In that project I also had a ViewPager and I can't have the same problem with the addOnPageListener method .

我尝试过重建项目并使用Gradle文件重新同步项目，但无济于事.

I've tried Rebuilding the Project and Resyncing the project with the Gradle file but to no avail.

谢谢.

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