在 searhview 方法中使用时 initloader 出错

如何解决在 searhview 方法中使用时 initloader 出错

当我在 searchview onQueryChange() 中使用加载器管理器时，我遇到了这个错误。

loaderManager.initLoader(1,null,this).forceLoad();

当我在 inCreate() 中使用此代码时，我没有收到错误。

import android.app.LoaderManager;

import android.app.LoaderManager.LoaderCallbacks;

import android.content.Intent;

import android.content.Loader;

import android.net.Uri;

import android.os.Bundle;

import android.view.View;

import android.widget.AdapterView;

import android.widget.ListView;

import android.widget.SearchView;

import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

import java.util.ArrayList;

import java.util.List;



public class MainActivity extends AppCompatActivity implements LoaderCallbacks<List<Book>> {

private final String urldata = "https://www.googleapis.com/books/v1/volumes?q=";
private String url;
private TextView textView;
private SearchView searchView;
private ListView listView;
private BookAdapter adapter;
public static final String LOG_TAG = Book.class.getName();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    init();

    adapter = new BookAdapter(this,new ArrayList<Book>());
    listView.setAdapter(adapter);

    LoaderManager loaderManager = getLoaderManager();

    // perform set on query text listener event
    searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener(){
        @Override
        public boolean onQueryTextSubmit(String query) {
            if (query != null) {
                url = urldata + query;
            }

            loaderManager.initLoader(1,this).forceLoad();
            return false;
        }

        @Override
        public boolean onQueryTextChange(String newText) {
            if (newText != null) {
                adapter.clear();
            }
            return false;
        }
    });

    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent,View view,int position,long id) {
            Book currentEarthquake = (Book) adapter.getItem(position);

            String url = currentEarthquake.getUrl();
            Intent i = new Intent(Intent.ACTION_VIEW);
            i.setData(Uri.parse(url));

            startActivity(i);
        }
    });
}

private void init() {
    textView = findViewById(R.id.textview);
    listView = findViewById(R.id.list);
    searchView = findViewById(R.id.search);
}

@Override
public Loader<List<Book>> onCreateLoader(int i,Bundle bundle) {
    // Create a new loader for the given URL
    return new BookLoader(this,url);
}

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

@Override
public void onLoaderReset(Loader<List<Book>> loader) {
    adapter.clear();
}
}