我正在使用Google图书API搜索带有标题的图书。它首次向我展示了结果。接下来我搜索它会清除ListView但不显示新的搜索结果。 有一个特殊的错误。当我搜索一本书时,它会显示3到4本书,而我已将MaxResult设置为10.当我在浏览器中手动调用API时,我得到10个结果。
这是我正在使用的代码。
public class MainActivity extends AppCompatActivity implements LoaderCallbacks<List<Book>>{
private static final int BOOK_ID = 1;
public static final String LOG_TAG = MainActivity.class.getName();
private static String book_url;
private BookAdapter mAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button bt=(Button)findViewById(R.id.search);
bt.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
EditText searchTerm=(EditText)findViewById(R.id.search_book);
String search=searchTerm.getText().toString();
book_url="https://www.googleapis.com/books/v1/volumes?q="+search+"&maxResults=10";
LoaderManager loaderManager = getLoaderManager();
loaderManager.initLoader(BOOK_ID, null, MainActivity.this);
mAdapter=new BookAdapter(MainActivity.this,new ArrayList<Book>());
ListView bookListView=(ListView)findViewById(R.id.list);
mAdapter.notifyDataSetChanged();
bookListView.setAdapter(mAdapter);
}
});
}
public Loader<List<Book>> onCreateLoader(int i,Bundle bundle){
return new BookLoader(this,book_url);
}
public void onLoadFinished(Loader<List<Book>> loader,List<Book> books){
mAdapter.clear();
if(books!=null&&!books.isEmpty()){
mAdapter.addAll(books);
}
}
public void onLoaderReset(Loader<List<Book>> loader){
mAdapter.clear();
}
}
我试过notifyDataSetChanged()。但它不起作用。
以下是自定义适配器的代码
package com.example.android.booksearch;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import java.util.List;
/**
* Created by AKSPAN12 on 19-07-2017.
*/
public class BookAdapter extends ArrayAdapter<Book> {
public BookAdapter(Context context, List<Book> books) {
super(context, 0,books);
}
public View getView(int position, View convertView, ViewGroup parent){
View listItemView=convertView;
if(listItemView==null){
listItemView= LayoutInflater.from(getContext()).inflate(R.layout.book_list,parent,false);
}
Book currentBook=getItem(position);
String author=currentBook.getAuthor();
TextView authorView=(TextView)listItemView.findViewById(R.id.book_author);
authorView.setText(author);
String bookName=currentBook.getBook();
TextView bookView=(TextView)listItemView.findViewById(R.id.book_name);
bookView.setText(bookName);
return listItemView;
}
}