java 如何将价值从 recyclerview 项目传递到另一个活动

How to pass value from recyclerview item to another activity

提问by C.Wijaya

I'm trying to pass the value in recyclerview item to another activity when we click the recyclerview item. Here I use the OnItemTouchListener.

当我们单击 recyclerview 项目时，我试图将 recyclerview 项目中的值传递给另一个活动。这里我使用OnItemTouchListener.

I retrieve data from JSON and parse it into ArrayList. I save 5 parameters. Title, ID, Rating, ReleaseDate, urlPoster, but right now i only show 2 parameters, Title, and image from urlposter.

我从 JSON 中检索数据并将其解析为 ArrayList。我保存了 5 个参数。标题、ID、评级、发布日期、urlPoster，但现在我只显示 urlposter 中的 2 个参数、标题和图像。

I want to pass the other parameters to another activity, but i can't find out how to do that.

我想将其他参数传递给另一个活动，但我不知道如何做到这一点。

There's another question similar like this (Values from RecyclerView item to other Activity), but he uses OnClick, not OnItemTouch, and he do that in the ViewHolder. I read somewhere in the internet that it's not the right thing to do.

还有另一个类似的问题（从 RecyclerView 项目到其他活动的值），但他使用 OnClick，而不是 OnItemTouch，并且他在 ViewHolder 中这样做。我在互联网上的某个地方读到这不是正确的做法。

Here's my code

这是我的代码

public class Tab1 extends Fragment {

    private static final String ARG_PAGE = "arg_page";
    private static final String STATE_MOVIES = "state movies";
    private TextView txtResponse;
    private String passID;

    // Progress dialog
    private ProgressDialog pDialog;


    //private String urlJsonArry = "http://api.androidhive.info/volley/person_array.json";
    private String urlJsonArry = "http://api.themoviedb.org/3/movie/popular?api_key=someapikeyhere";
    private String urlJsonImg = "http://image.tmdb.org/t/p/w342";

    // temporary string to show the parsed response
    private String jsonResponse = "";

    RecyclerView mRecyclerView;
    RecyclerView.LayoutManager mLayoutManager;
    RecyclerView.Adapter mAdapter;

    private ArrayList<Movies> movies = new ArrayList<Movies>();


    public Tab1() {
        // Required empty public constructor
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putParcelableArrayList(STATE_MOVIES, movies);
    }

    public static Tab1 newInstance(int pageNumber){

        Tab1 myFragment = new Tab1();
        Bundle arguments = new Bundle();
        arguments.putInt(ARG_PAGE, pageNumber);
        myFragment.setArguments(arguments);
        return myFragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);



        pDialog = new ProgressDialog(getActivity());
        pDialog.setMessage("Please wait...");
        pDialog.setCancelable(false);
    }


    /**
     * Method to make json object request where json response starts wtih {
     * */
    private void makeJsonObjectRequest() {

        showpDialog();

        final JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(urlJsonArry, new Response.Listener<JSONObject>() {


            @Override
            public void onResponse(JSONObject response) {
                //Log.d(TAG, response.toString());

                try {

                    JSONArray result = response.getJSONArray("results");

                    //Iterate the jsonArray and print the info of JSONObjects
                    for(int i=0; i < result.length(); i++){
                        JSONObject jsonObject = result.getJSONObject(i);

                        String id = jsonObject.getString("id");
                        String originalTitle = jsonObject.getString("original_title");
                        String releaseDate = jsonObject.getString("release_date");
                        String rating = jsonObject.getString("vote_average");
                        String urlThumbnail = urlJsonImg + jsonObject.getString("poster_path");

                        //jsonResponse = "";
                        jsonResponse += "ID: " + id + "\n\n";
                        jsonResponse += "Title: " + originalTitle + "\n\n";
                        jsonResponse += "Release Date: " + releaseDate + "\n\n";
                        jsonResponse += "Rating: " + rating + "\n\n";
                }
                    //Toast.makeText(getActivity(),"Response = "+jsonResponse,Toast.LENGTH_LONG).show();
                    parseResult(response);

                }catch (JSONException e) {
                    e.printStackTrace();
                    Toast.makeText(getActivity(),"Error: " + e.getMessage(),
                            Toast.LENGTH_LONG).show();
                }
                hidepDialog();
            }
        }, new Response.ErrorListener() {

            @Override
            public void onErrorResponse(VolleyError error) {
                //VolleyLog.d(TAG, "Error: " + error.getMessage());
                Toast.makeText(getActivity(),
                        error.getMessage(), Toast.LENGTH_SHORT).show();
                // hide the progress dialog
                hidepDialog();
            }
        });

        // Adding request to request queue
        VolleySingleton.getInstance(getActivity()).addToRequestQueue(jsonObjectRequest);
    }


    private void showpDialog() {
        if (!pDialog.isShowing())
            pDialog.show();
    }

    private void hidepDialog() {
        if (pDialog.isShowing())
            pDialog.dismiss();
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        //txtResponse = (TextView) getActivity().findViewById(R.id.txtResponse);
        //makeJsonArrayRequest();

        // Calling the RecyclerView
        mRecyclerView = (RecyclerView) getActivity().findViewById(R.id.recycler_view_movie);
        mRecyclerView.setHasFixedSize(true);

        // The number of Columns
        mLayoutManager = new GridLayoutManager(getActivity(),2);
        mRecyclerView.setLayoutManager(mLayoutManager);

        mAdapter = new MovieAdapter(getActivity(),movies);
        mRecyclerView.setAdapter(mAdapter);

        mRecyclerView.addOnItemTouchListener(new RecyclerTouchListener(getActivity(), mRecyclerView, new ClickListener() {
            @Override
            public void onMovieClick(View view, int position) {
                Toast.makeText(getActivity(), "Kepencet " + position, Toast.LENGTH_SHORT).show();

                **//what to do here?**
            }

            @Override
            public void onMovieLongClick(View view, int position) {
                Toast.makeText(getActivity(),"Kepencet Lama "+position,Toast.LENGTH_LONG).show();
            }
        }));

        makeJsonObjectRequest();

        if (savedInstanceState!=null){
            movies=savedInstanceState.getParcelableArrayList(STATE_MOVIES);
            mAdapter.notifyDataSetChanged();
        }
    }



    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view =  inflater.inflate(R.layout.tab_1, container, false);


        return view;
    }

    private void parseResult(JSONObject response) {
        try {
            JSONArray arrayMovies = response.getJSONArray("results");


            if (movies == null) {
                movies = new ArrayList<Movies>();
            }



            for (int i = 0; i < arrayMovies.length(); i++) {

                JSONObject currentMovies = arrayMovies.getJSONObject(i);

                Movies item = new Movies();
                item.setTitle(currentMovies.optString("original_title"));
                item.setRating(currentMovies.optString("vote_average"));
                item.setReleaseDate(currentMovies.optString("release_date"));
                item.setId(currentMovies.optString("id"));
                item.setUrlThumbnail(urlJsonImg+currentMovies.optString("poster_path"));
                movies.add(item);
                mAdapter.notifyDataSetChanged();

                //Toast.makeText(getActivity(),"Movie : "+movies,Toast.LENGTH_LONG).show();
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }

    class RecyclerTouchListener implements RecyclerView.OnItemTouchListener{
        private GestureDetector mGestureDetector;
        private ClickListener mClickListener;


        public RecyclerTouchListener(final Context context, final RecyclerView recyclerView, final ClickListener clickListener) {
            this.mClickListener = clickListener;
            mGestureDetector = new GestureDetector(context,new GestureDetector.SimpleOnGestureListener(){
                @Override
                public boolean onSingleTapUp(MotionEvent e) {
                    return true;
                }

                @Override
                public void onLongPress(MotionEvent e) {
                    View child = recyclerView.findChildViewUnder(e.getX(),e.getY());
                    if (child!=null && clickListener!=null){
                        clickListener.onMovieLongClick(child,recyclerView.getChildAdapterPosition(child));
                    }
                    super.onLongPress(e);
                }
            });
        }

        @Override
        public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
            View child = rv.findChildViewUnder(e.getX(), e.getY());
            if (child!=null && mClickListener!=null && mGestureDetector.onTouchEvent(e)){
                mClickListener.onMovieClick(child,rv.getChildAdapterPosition(child));
            }
            return false;
        }

        @Override
        public void onTouchEvent(RecyclerView rv, MotionEvent e) {

        }

        @Override
        public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {

        }
    }

    public static interface ClickListener{
        public void onMovieClick(View view, int position);
        public void onMovieLongClick(View view, int position);
    }

}

any help would be appreciated. Thanks!

任何帮助，将不胜感激。谢谢！

回答by Sree

You need to add those other two values to a bundle in the intent. So something like this:

您需要将另外两个值添加到意图中的包中。所以像这样：

Intent intent = new Intent(getActivity(), YourNextActivity.class);
intent.putExtra("movie_id_key", movies.get(position).getId); //you can name the keys whatever you like
intent.putExtra("movie_rating_key", movies.get(position).getRating); //note that all these values have to be primitive (i.e boolean, int, double, String, etc.)
intent.putExtra("movie_release_date_key", movies.get(position).getReleaseDate);
startActivity(intent)

And in your new activity just do this to retrieve:

在您的新活动中，只需执行此操作即可检索：

 String id = getIntent().getExtras().getString("movie_id_key");

回答by MrPlow

Add them as extras in the intent with which you start the activity:

在您开始活动的意图中将它们添加为额外内容：

Intent intent = new Intent(currentActivity, targetActivity);
// Sree was right in his answer, it's putExtra, not putStringExtra. =(
intent.putExtra("title", title); 
// repeat for ID, Rating, ReleaseDate, urlPoster
startActivity(intent);

then pull them out in the onCreate of the other activity with

然后在另一个活动的 onCreate 中将它们拉出来

Intent startingIntent = getIntent();
String title = startingIntent.getStringExtra("title"); // or whatever.

---

---

In response to the comment below: I'm not 100% sure how you implemented it, but it looks like you have onclick handlers that pass a position and a view reference, right? Adapt it as you like, but basically...:

回应下面的评论：我不是 100% 确定你是如何实现它的，但看起来你有传递位置和视图引用的 onclick 处理程序，对吧？根据自己的喜好调整它，但基本上......：

public void onClick(View v, int position){
    Movie m = movies.get(position);
    Intent intent = new Intent(v.getContext(), AnotherActivity.class);
    intent.putExtra("my_movie_foo_key", m.getFoo());
    intent.putExtra("my_movie_bar_key", m.getBar());
    // etc.
    v.getContext().startActivity(intent);
}

As long as you have a valid context reference (and they couldn't click on a view without a valid context), you can start an activity from wherever you like.

只要您有一个有效的上下文引用（并且他们无法在没有有效上下文的情况下单击视图），您就可以从您喜欢的任何位置开始活动。