• 嗨，有一个问题，我如何加载来自Internet的数据的ArrayList？我想要实现的是在EditText中输入一个文本，当按下按钮时，RecycerView将加载该搜索中的所有数据。

我创建了以下类:

public class ParseItem {
    private String imgUrl;
    private String title;
    private String detailUrl;

    public ParseItem() {
    }

    public ParseItem(String imgUrl, String title, String detailUrl) {
        this.imgUrl = imgUrl;
        this.title = title;
        this.detailUrl = detailUrl;
    }

    public String getImgUrl() {
        return imgUrl;
    }

    public void setImgUrl(String imgUrl) {
        this.imgUrl = imgUrl;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getDetailUrl() {
        return detailUrl;
    }

    public void setDetailUrl(String detailUrl) {
        this.detailUrl = detailUrl;
    }
}

我将其传递给适配器:

public class ParseAdapter extends RecyclerView.Adapter<ParseAdapter.ViewHolder> {

    private ArrayList<ParseItem> parseItems;
    private Context context;

    public ParseAdapter(ArrayList<ParseItem> parseItems, Context context) {
        this.parseItems = parseItems;
        this.context = context;
    }

    @NonNull
    @Override
    public ParseAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.parse_item, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull ParseAdapter.ViewHolder holder, int position) {
        ParseItem parseItem = parseItems.get(position);
        holder.textView.setText(parseItem.getTitle());
        Picasso.get().load(parseItem.getImgUrl()).into(holder.imageView);
    }

    @Override
    public int getItemCount() {
        return parseItems.size();
    }

    public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
        ImageView imageView;
        TextView textView;

        public ViewHolder(@NonNull View view) {
            super(view);
            imageView = view.findViewById(R.id.imageView);
            textView = view.findViewById(R.id.textView);
            view.setOnClickListener(this);
        }
    }

    public void setFilter(ArrayList<ParseItem> newList) {
        parseItems = new ArrayList<>();
        parseItems.addAll(newList);
        notifyDataSetChanged();
    }
}

这就是我在activity所做的:

public class MainActivity extends AppCompatActivity {
    Button buscar;
    EditText textoBusqueda;

    private RecyclerView recyclerView;
    private ParseAdapter adapter;
    private ArrayList<ParseItem> parseItems = new ArrayList<>();
    private ProgressBar progressBar;

    @RequiresApi(api = Build.VERSION_CODES.N)
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    protected void onResume() {
        super.onResume();

        progressBar = findViewById(R.id.progressBar);
        recyclerView = findViewById(R.id.recyclerView);

        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        adapter = new ParseAdapter(parseItems, this);
        recyclerView.setAdapter(adapter);



        textoBusqueda = (EditText)findViewById(R.id.etBuscar);

        String texto = textoBusqueda.getText().toString();
        buscar = (Button)findViewById(R.id.btnBusqueda);

        buscar.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(TextUtils.isEmpty(textoBusqueda.getText())){
                    Toast.makeText(MainActivity.this, "Debe ingresar el nombre del libro.", Toast.LENGTH_LONG).show();
                    textoBusqueda.setFocusable(true);
                }else{
                    Content content = new Content();
                    content.execute();
                }
            }
        });
    }

    private class Content extends AsyncTask<Void,Void,Void> {

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            progressBar.setVisibility(View.VISIBLE);
            progressBar.startAnimation(AnimationUtils.loadAnimation(MainActivity.this, android.R.anim.fade_in));
        }

        @Override
        protected void onPostExecute(Void aVoid) {
            super.onPostExecute(aVoid);
            progressBar.setVisibility(View.GONE);
            progressBar.startAnimation(AnimationUtils.loadAnimation(MainActivity.this, android.R.anim.fade_out));
            adapter.notifyDataSetChanged();
        }

        @Override
        protected Void doInBackground(Void... voids) {
            String url = "http://kx5thpx2olielkihfyo4jgjqfb7zx7wxr3sd4xzt26ochei4m6f7tayd.onion/search/?q="+ textoBusqueda.getText().toString();
            try {
                Document doc = Jsoup.connect(url).get();

                Elements data = doc.select("div.span1");
                int size = data.size();
                Log.d("doc", "doc: "+doc);
                Log.d("data", "data: "+data);
                Log.d("size", ""+size);
                for (int i = 0; i < size; i++) {
                    String imgUrl = data.select("div.span1")
                            .select("img")
                            .eq(i)
                            .attr("src");

                    String title = data.select("div.span7")
                            .select("span")
                            .eq(i)
                            .text();

                    String detailUrl = data.select("div.span7")
                            .select("a")
                            .eq(i)
                            .attr("href");

                    parseItems.add(new ParseItem(imgUrl, title, detailUrl));
                    Log.d("items", "img: " + imgUrl + " . title: " + title);
                }

            } catch (IOException e) {
                e.printStackTrace();
            }
            return null;
        }
    }
}

但是，它没有加载任何东西，日志猫没有显示错误，有什么建议吗？