LoaderManager 抛出不兼容的类型错误

LoaderManager throwing incompatible types error

我在我创建的片段之一中调用 AsyncTaskLoader。我已导入 import android.app.LoaderManager;,但在调用此方法 LoaderManager manager = getLoaderManager(); 时出现错误。我的主 activity 中也有同样的事情发生,但它没有抛出任何错误。

它还要求我导入此 android.support.v4.app.LoaderManager 而不是 android.support.v4.app.LoaderManager。当我这样做时,它显示 getLoaderManager() 已弃用。

我的FragmentExchangeList.java

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.app.LoaderManager;
import android.content.Loader;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AutoCompleteTextView;
import android.widget.ListView;
import java.util.ArrayList;
import java.util.List;

public class FragmentExchangeList extends Fragment implements   
LoaderManager.LoaderCallbacks<ArrayList<ExchangeListData>> {              
    private List<ExchangeListData> mExchangeListData;
    private ListView mExchangeListView;
    private AutoCompleteTextView mSetbaseCurrency;
    private String linkForCurrencyList;
    private static final int CURRENCY_List_LOADER_ID = 2;

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

        mExchangeListData = new ArrayList<ExchangeListData>();
        mExchangeListView = rootView.findViewById(R.id.exchange_list_view);
        mSetbaseCurrency = rootView.findViewById(R.id.set_base_currency);

        linkForCurrencyList = "https://ratesapi.io/api/latest?base="+mSetbaseCurrency.getText().toString();
        LoaderManager manager = getLoaderManager();
        manager.initLoader(CURRENCY_List_LOADER_ID, null, this);

        return rootView;
    }


    @Override
    public Loader<ArrayList<ExchangeListData>> onCreateLoader(int i, Bundle bundle) {
        return new ExchangeListBackground(getContext(), linkForCurrencyList);
    }

    @Override
    public void onLoadFinished(Loader<ArrayList<ExchangeListData>> loader, ArrayList<ExchangeListData> data) {
        mExchangeListData.clear();
        if(data != null && !data.isEmpty()){
            mExchangeListData.addAll(data);
        }
    }

    @Override
    public void onLoaderReset(Loader<ArrayList<ExchangeListData>> loader) {
        mExchangeListData.clear();
    }
}

错误是error: incompatible types: android.support.v4.app.LoaderManager cannot be converted to android.app.LoaderManager

删除 import android.app.LoaderManager; 并添加此行 import android.support.v4.app.LoaderManager

我以前遇到过同样的问题。您正在使用的 fragment 来自支持库,因此您也需要将 android.support.v4.app.LoaderManager 包用于 LoadManager

但是搜索关于弃用,是因为google 弃用了所有加载程序堆栈,他们建议使用 Jobs。因此,要解决您的问题,请使用已弃用的包并在 Android Studio not be annoying.

中添加一条禁止弃用的评论