LoaderManager抛出不兼容的类型错误

问题描述 投票:0回答:2

我在我创建的一个片段中调用AsyncTaskLoader。我已经导入了import android.app.LoaderManager;,并且在调用此方法时遇到错误LoaderManager manager = getLoaderManager();。我在主要活动中也有同样的事情,它不会抛出任何错误。

它还要求我导入这个android.support.v4.app.LoaderManager而不是android.support.v4.app.LoaderManager。当我这样做时,显示getLoaderManager()已被弃用。

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

android fragment android-loadermanager
2个回答
1
投票

我过去也遇到过同样的问题。您使用的fragment来自支持库,因此您需要将android.support.v4.app.LoaderManager包用于LoadManager

但是搜索弃用,是因为谷歌正在弃用所有的加载器堆栈,他们建议使用Jobs。因此,要解决您的问题,请使用已弃用的软件包,并对Android Studio中添加一个禁止弃用的评论,这并不烦人。


1
投票

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

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