获取recyclerview位置并在点击时传递对象

Question

我真的需要你们的帮助，我被困住了。简而言之，我制作了 recyclerview 来显示我解析的 json 数据。我坚持的是如何获得recyclerview位置并将json对象传递给新的活动槽意图。这是我的代码，所以你可以看到发生了什么。 主要活动：

public class MainActivity extends AppCompatActivity implements SearchView.OnQueryTextListener {

ArrayList<Item> end = new ArrayList<Item>();
RecyclerView recyclerView;
Adapter adapter;
List<Item> mModels;
Context context = this;

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    outState.putParcelableArrayList("KEY2", end);

}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    // View view = LayoutInflater.from(this).inflate(R.layout.activity_main, null, false);
    setContentView(R.layout.activity_main);
    recyclerView = (RecyclerView) findViewById(R.id.RecylerView);
    recyclerView.setLayoutManager(new LinearLayoutManager(this));
    adapter = new Adapter(this);
    recyclerView.setAdapter(adapter);


    if (isAvailable() && savedInstanceState == null)
    //Check if network is available
    {
        jsonreq();
    } else if (savedInstanceState != null)

    {
        end = savedInstanceState.getParcelableArrayList("KEY2");
        adapter.list(end);


    } else {
        Toast.makeText(this, "Molimo, ukljucite internet.", Toast.LENGTH_LONG).show();

    }


}


private boolean isAvailable() {
    ConnectivityManager manager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo networkInfo = manager.getActiveNetworkInfo();
    Boolean isAvail = false;
    if (networkInfo != null && networkInfo.isConnected()) {
        isAvail = true;
    }
    return isAvail;

}

public void jsonreq() {
    String url = "http://www.json-generator.com/api/json/get/cfOhbHcpki?indent=2";
    RequestQueue requestQueue = VolleySingelton.getrequestQueue();

    JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url, null, new Response.Listener<JSONObject>() {

        @Override
        public void onResponse(JSONObject response) {
            end = getdata(response);
            adapter.list(end);

        }
    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {

        }
    });
    requestQueue.add(request);

}

private ArrayList<Item> getdata(JSONObject response) {
    ArrayList<Item> listy = new ArrayList<Item>();

    try {

        JSONArray array = response.getJSONArray("items");

        for (int i = 0; i < array.length(); i++) {
            JSONObject object1 = array.getJSONObject(i);
            String content = object1.getString("caption");
            String url = object1.getString("url");
            String proba = object1.getString("proba");
            // ImageView image = process(url,imageView);
            Item I = new Item(content, url, proba);
            listy.add(I);

        }


    } catch (JSONException e) {
        e.printStackTrace();
        Toast.makeText(this, "Error" + e, Toast.LENGTH_LONG).show();
    }
    Log.d("mohak", "" + response.length());

    return listy;

}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    MenuItem menuItem = menu.findItem(R.id.action_search);
    SearchView searchView = (SearchView) MenuItemCompat.getActionView(menuItem);
    SearchManager manager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
    searchView.setIconifiedByDefault(true);
    searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextSubmit(String query) {
            return true; // handled
        }

        @Override
        public boolean onQueryTextChange(String newText) {

           adapter.getFilter().filter(newText);

            return true;
        }
    });
    return true;
}


@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar Item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}


@Override
public boolean onQueryTextSubmit(String query) {
    return false;
}

@Override
public boolean onQueryTextChange(String newText) {
    return false;
}

这是适配器：

public class Adapter extends RecyclerView.Adapter<Adapter.ViewHolder> implements  Filterable{

public static final String LIST_DETAIL_KEY = "list";

public Item item;

private LayoutInflater inflater;
Context context;
ArrayList<Item> fin = new ArrayList<Item>();


Adapter(Context context) {
    inflater = LayoutInflater.from(context);
    this.context = context;
}

public void list(ArrayList<Item> fin) {
    this.fin = fin;
    Search search = new Search(fin);
    notifyItemRangeChanged(0, fin.size());
}

@Override
public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {

    View view = inflater.inflate(R.layout.rac, viewGroup, false);
    ViewHolder holder = new ViewHolder(view);

    return holder;
}

@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
    super.onAttachedToRecyclerView(recyclerView);
}

@Override
public void onBindViewHolder(ViewHolder viewHolder, int i) {

    Item current = fin.get(i);
    viewHolder.content.setText(current.content);
    viewHolder.proba.setText(current.proba);


    //  Uri uri = Uri.parse(current.url);
    //  Context context = viewHolder.imageView.getContext();
    Picasso.with(context).load(current.url).into(viewHolder.imageView);

}

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

@Override
public Filter getFilter() {
    Search search = new Search(fin);
    return search;
}


class ViewHolder extends RecyclerView.ViewHolder {
    TextView content;
    TextView proba;
    ImageView imageView;


    public ViewHolder(View itemView) {
        super(itemView);

        content = (TextView) itemView.findViewById(R.id.textView);
        proba = (TextView) itemView.findViewById(R.id.textView2);
        imageView = (ImageView) itemView.findViewById(R.id.imageView);


    }
}
}

提前谢谢你。

Answer 1

我们处理点击事件，我试过下面的方法 创建接口RecyclerOnItemClickListener

import android.view.View;

/**
 * A click listener for items.
 */
public interface RecyclerOnItemClickListener {
    /**
     * Called when an item is clicked.
     *
     * @param childView View of the item that was clicked.
     * @param position  Position of the item that was clicked.
     */
    public void onItemClick(View childView, int position);
}

在适配器类中，可以取调用Activity/Fragment中实现的RecyclerOnItemClickListener对象

RecyclerOnItemClickListener mItemClickListener;

然后您可以在适配器的构造函数中初始化该变量

mItemClickListener = recyclerOnItemClickListener;

activity/Fragment 实现了 RecyclerOnItemClickListener 接口，所以它会实现 onItemClick 方法。您可以在此处编写用于在下一个活动中传递数据的代码

@Override
    public void onItemClick(View childView, int position)
    {
        Intent intent = new Intent(getActivity(), NextActivity.class);
        intent.putExtra("ITEM", mModels.get(position));
        startActivity(intent);
    }

在适配器类中，您需要初始化 ViewHolder 类，如下所示：

class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener
{
    TextView content;
    TextView proba;
    ImageView imageView;


    public ViewHolder(View itemView) {
        super(itemView);

        content = (TextView) itemView.findViewById(R.id.textView);
        proba = (TextView) itemView.findViewById(R.id.textView2);
        imageView = (ImageView) itemView.findViewById(R.id.imageView);


    }

        @Override
        public void onClick(View v)
        {
            if (mItemClickListener != null)
            {
                mItemClickListener.onItemClick(v, getPosition());
            }
        }
}

希望对你有所帮助..

Answer 2

试试这个：

public class Adapter extends RecyclerView.Adapter<Adapter.ViewHolder> implements  Filterable{

    public static final String LIST_DETAIL_KEY = "list";

    public Item item;

    private LayoutInflater inflater;
    Context context;
    ArrayList<Item> fin = new ArrayList<Item>();


    Adapter(Context context) {
        inflater = LayoutInflater.from(context);
        this.context = context;
    }

    public void list(ArrayList<Item> fin) {
        this.fin = fin;
        Search search = new Search(fin);
        notifyItemRangeChanged(0, fin.size());
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {

        View view = inflater.inflate(R.layout.rac, viewGroup, false);
        ViewHolder holder = new ViewHolder(view);

        return holder;
    }

    @Override
    public void onAttachedToRecyclerView(RecyclerView recyclerView) {
        super.onAttachedToRecyclerView(recyclerView);
    }

    @Override
    public void onBindViewHolder(ViewHolder viewHolder, int i) {

        Item current = fin.get(i);
        viewHolder.content.setText(current.content);
        viewHolder.proba.setText(current.proba);


        //  Uri uri = Uri.parse(current.url);
        //  Context context = viewHolder.imageView.getContext();     
        Picasso.with(context).load(current.url).into(viewHolder.imageView);
        holder.itemView.setOnClickListener(new Listener(position,current));
    }

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

    @Override
    public Filter getFilter() {
        Search search = new Search(fin);
        return search;
    }


    class Listener implements OnClickListener {
        private int position;
        Item data;

        Listener(int position,Item data) {
            this.position = position;

            this.data = data;
        }

        @SuppressLint("UseValueOf")
        @Override
        public void onClick(View v) {
            // you get the unique id of every item and perform your desired operation
            // Here you can send data to another activity according to position
            // You get each item data object
        }
    }

    class ViewHolder extends RecyclerView.ViewHolder {
        TextView content;
        TextView proba;
        ImageView imageView;
        View itemView;

        public ViewHolder(View itemView) {
            super(itemView);
            this.itemView =itemView;
            content = (TextView) itemView.findViewById(R.id.textView);
            proba = (TextView) itemView.findViewById(R.id.textView2);
            imageView = (ImageView) itemView.findViewById(R.id.imageView);    
        }
    }
}