以下是一个解决Android网络问题的示例,该示例使用Google Book API和LoadManager/ AsyncTaskLoader来获取图书数据:
public class Book {
private String title;
private String author;
public Book(String title, String author) {
this.title = title;
this.author = author;
}
public String getTitle() {
return title;
}
public String getAuthor() {
return author;
}
}
public class BookLoader extends AsyncTaskLoader> {
private String mQuery;
public BookLoader(Context context, String query) {
super(context);
mQuery = query;
}
@Override
protected void onStartLoading() {
forceLoad();
}
@Override
public List loadInBackground() {
List books = new ArrayList<>();
// 执行网络请求并解析JSON数据
// 使用mQuery来构建请求URL
// 使用HttpURLConnection或OkHttp发送请求,并获取响应数据
// 解析响应JSON数据并创建Book对象
// 将Book对象添加到books列表中
return books;
}
}
public class MainActivity extends AppCompatActivity implements LoaderManager.LoaderCallbacks> {
private static final int LOADER_ID = 1;
private BookAdapter mAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 初始化RecyclerView和Adapter
RecyclerView recyclerView = findViewById(R.id.recycler_view);
mAdapter = new BookAdapter();
recyclerView.setAdapter(mAdapter);
// 初始化LoaderManager,并启动Loader
LoaderManager.getInstance(this).initLoader(LOADER_ID, null, this);
}
@NonNull
@Override
public Loader> onCreateLoader(int id, @Nullable Bundle args) {
// 创建并返回BookLoader实例
String query = "android"; // 替换为你想搜索的书籍关键字
return new BookLoader(this, query);
}
@Override
public void onLoadFinished(@NonNull Loader> loader, List data) {
// 更新Adapter的数据集
mAdapter.setData(data);
}
@Override
public void onLoaderReset(@NonNull Loader> loader) {
// 重置Adapter的数据集
mAdapter.setData(null);
}
}
public class BookAdapter extends RecyclerView.Adapter {
private List mBooks;
public void setData(List books) {
mBooks = books;
notifyDataSetChanged();
}
@NonNull
@Override
public BookViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_book, parent, false);
return new BookViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull BookViewHolder holder, int position) {
Book book = mBooks.get(position);
holder.titleTextView.setText(book.getTitle());
holder.authorTextView.setText(book.getAuthor());
}
@Override
public int getItemCount() {
return mBooks == null ? 0 : mBooks.size();
}
public static class BookViewHolder extends RecyclerView.ViewHolder {
TextView titleTextView;
TextView authorTextView;
public BookViewHolder(@NonNull View itemView) {
super(itemView);
titleTextView = itemView.findViewById(R.id.title_text_view);
authorTextView = itemView.findViewById(R.id.author_text_view);
}
}
}
请注意,这只是一个示例,你需要根据你的具体需求进行修改和优化。此外,你还需要添加网络权限和相关依赖项才能使该示例正常工作。
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