java 将 RecyclerView CardView 单击的项目数据传递给活动

Passing RecyclerView CardView Clicked Item Data To Activity

提问by Jaeger

I have a question about passing clicked cardview data to activity, and here the full story :

我有一个关于将点击的 cardview 数据传递给活动的问题，这里是完整的故事：

1. I have an Activity called "Details", which contains 2 TextViews in it's layout, Title & Description .

2. I have setup a fragment ( tab_1 ) which contain the recyclerview codes and the the items data, each item of those contain : title & description .

1. 我有一个名为“Details”的活动，它的布局中包含 2 个 TextView， Title 和 Description 。

2. 我已经设置了一个片段（ tab_1 ），其中包含 recyclerview 代码和项目数据，其中的每个项目都包含： title 和 description 。

What i want :

我想要的是 ：

When the user click the item, it will open the Details Activity, and change Details layout title, with clicked item title, and the same for description .

当用户点击item时，会打开Details Activity，更改Details布局标题，点击item标题，description也一样。

I've manged to create the other activity as an example, and made intent to start it, plus adding "addOnTouchlistener" thanks to Stackoverflow, i've found the way to make it .

我已经设法创建另一个活动作为示例，并有意启动它，再加上感谢 Stackoverflow 添加“addOnTouchlistener”，我找到了制作它的方法。

So, how to make this alive? I've tried many ways of the available answers on Stackoverflow, but all of them not working, or not related to my request .

那么，如何让它活起来呢？我在 Stackoverflow 上尝试了多种可用答案的方法，但它们都不起作用，或者与我的请求无关。

Here are my files :

这是我的文件：

itemsdata.java :

项目数据.java：

public class itemsdata {
int CatPic;
String title;
String Descr;
int Exapnd;
int expand_no;

tab_1.java ( fragment )

tab_1.java（片段）

public class tab_1 extends Fragment implements SearchView.OnQueryTextListener {

private RecyclerView mRecyclerView;
public RecyclingViewAdapter adapter;
private Activity context;
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View layout = inflater.inflate(R.layout.tab_1, container, false);
    mRecyclerView = (RecyclerView)layout.findViewById(R.id.recycler_view);
    mRecyclerView.addOnItemTouchListener(new RecyclerItemClickListener
            (getContext(), new RecyclerItemClickListener.OnItemClickListener() {

                @Override
                public void onItemClick(View view, int position) {
                    Intent i = new Intent(view.getContext(), DetailsActivity.class);
                    view.getContext().startActivity(i);
                }
            }));
    mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
    adapter = new RecyclingViewAdapter(getActivity(),Listed());
    mRecyclerView.setAdapter(adapter);
    return layout;

}


@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    inflater.inflate(R.menu.main, menu);

    final MenuItem item = menu.findItem(R.id.action_search);
    final SearchView searchView = (SearchView) MenuItemCompat.getActionView(item);
    searchView.setOnQueryTextListener(this);
}

@Override
public boolean onQueryTextChange(String query) {
    final List<itemsdata> filteredModelList = filter(Listed(), query);
    adapter.animateTo(filteredModelList);
    mRecyclerView.scrollToPosition(0);
    return true;
}

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

private List<itemsdata> filter(List<itemsdata> models, String query) {
    query = query.toLowerCase();

    final List<itemsdata> filteredModelList = new ArrayList<>();
    for (itemsdata model : models) {
        final String text = model.title.toLowerCase();
        if (text.contains(query)) {
            filteredModelList.add(model);
        }
    }
    return filteredModelList;
}

public List<itemsdata> Listed()
{
    //Titles Strings
    String sys_title1 = getString(R.string.system_item_title_1);
    String sys_title2 = getString(R.string.system_item_title_2);
    String sys_title3 = getString(R.string.system_item_title_3);

    //Description Strings
    String sys_descr1 = getString(R.string.system_item_desc_1);
    String sys_descr2 = getString(R.string.system_item_desc_2);
    String sys_descr3 = getString(R.string.system_item_desc_3);

    //Adding New Cards
    List<itemsdata> data = new ArrayList<>();

    //Categories Icons New Items ** Make It The Same
    int[] icons = {
            R.drawable.facebook_icon ,
            R.drawable.twitter_icon ,
            R.drawable.twitter_icon
    };

    //Expand Button New Items
    int[] expandbutton = {
            R.drawable.expanded ,
            R.drawable.expanded ,
            R.drawable.expanded
    };

    //UnExpand Button New Items
    int[] unexpandbutton = {
            R.drawable.ca_expand ,
            R.drawable.ca_expand ,
            R.drawable.ca_expand
    };

    //Titles New Items
    String[] titles = {
            sys_title1 ,
            sys_title2 ,
            sys_title3
    };

    //Description New Items
    String[] Description = {
            sys_descr1 ,
            sys_descr2 ,
            sys_descr3
    };


    for(int i = 0;i<titles.length && i < icons.length  && i < Description.length && i < unexpandbutton.length && i < expandbutton.length  ; i++)
    {
        itemsdata current = new itemsdata();
        current.CatPic = icons[i];
        current.title = titles[i];
        current.Descr = Description[i];
        current.expand_no = unexpandbutton[i];
        current.Exapnd = expandbutton[i];
        data.add(current);
    }
    return data;
}

}

Details Activity :

活动详情：

public class DetailsActivity extends AppCompatActivity{

TextView title;

@Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.details);
    title = (TextView)findViewById(R.id.details_title);
}

EDIT : I've made it, i have added a button which open the fragment, and passed the data, in the Adapter, but i want it via tab_1.java, not the Adapter, i mean i want to click on the item to open the fragment, not on a button, here a snap from my Adapter code ( i've added it in OnBindViewHolder )

编辑：我已经做到了，我添加了一个按钮来打开片段，并在适配器中传递数据，但我希望它通过 tab_1.java，而不是适配器，我的意思是我想单击该项目以打开片段，而不是在按钮上，这里是我的适配器代码中的一个快照（我已将其添加到 OnBindViewHolder 中）

I've setup a OnClick and implemented the Vew.setOnClick ..etc, but when i click the item, nothing happen.

我已经设置了一个 OnClick 并实现了 Vew.setOnClick ..etc，但是当我单击该项目时，什么也没有发生。

 @Override
public void onBindViewHolder(final MyRecycleViewHolder holder, int position) {

    holder.itemView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent i = new Intent(v.getContext(),DetailsActivity.class);
            v.getContext().startActivity(i);
        }
    });

    //Referencing Data
    final itemsdata currentobject = mdata.get(position);
    //Referencing Items
    holder.ProbTitle.setText(currentobject.title);
    holder.ProbDescr.setText(currentobject.Descr);
    holder.CategoryPic.setImageResource(currentobject.CatPic);
    holder.ExpandButton.setImageResource(currentobject.Exapnd);
    holder.ExpandNoButton.setImageResource(currentobject.expand_no);
        //What Happen When You Click Expand Button .
    holder.ExpandButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent i = new Intent(v.getContext(), DetailsActivity.class);
            i.putExtra("TitleKey",holder.ProbTitle.getText().toString());
            v.getContext().startActivity(i);
            }
        }
    );

public static class MyRecycleViewHolder extends RecyclerView.ViewHolder
{



    SwipeLayout swipeLayout;
    //Defining Items .
    TextView ProbTitle;
    ImageButton ExpandButton;
    TextView ProbDescr;
    ImageButton ExpandNoButton;
    ImageView CategoryPic;
    /*
    TextView Card_Star;
    TextView Card_UnStar;
    */
    TextView Card_Share;

    //Referencing Resources
    public MyRecycleViewHolder(final View itemView) {
        super(itemView);
        ProbTitle = (TextView) itemView.findViewById(R.id.prob_title);
        CategoryPic = (ImageView) itemView.findViewById(R.id.cat_pic);
        ProbDescr = (TextView) itemView.findViewById(R.id.prob_descr);
        ExpandButton = (ImageButton) itemView.findViewById(R.id.expand_button);
        ExpandNoButton = (ImageButton) itemView.findViewById(R.id.expand_no_button);
        /*
        Card_Star = (TextView) itemView.findViewById(R.id.card_star);
        Card_UnStar = (TextView) itemView.findViewById(R.id.card_unstar);
        */
        Card_Share = (TextView) itemView.findViewById(R.id.card_share);
        swipeLayout = (SwipeLayout) itemView.findViewById(R.id.swipe);

    }

采纳答案by Vipul Asri

create an Interfaceinside your adapter containing methods. And while implementing your Adapter, those methods will be implemented in your activity and you can perform whatever action you want.

Interface在您的适配器内部创建一个包含methods. 在实现您的适配器时，这些方法将在您的活动中实现，您可以执行任何您想要的操作。

    public class Adapter extends RecyclerView.Adapter<MyRecycleViewHolder> {

    public interface Callbacks {
        public void onButtonClicked(String titleKey);
    }

    private Callbacks mCallbacks;

    public Adapter() {

    }

    @Override
    public MyRecycleViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
        View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.layout_details, null);
        return new MyRecycleViewHolder(v);
    }

    @Override
    public void onBindViewHolder(final MyRecycleViewHolder holder, final int i) {

        holder.ExpandButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mCallbacks != null) {
                    mCallbacks.onButtonClicked(holder.ProbTitle.getText().toString());
                }
            }
        });

    }


    @Override
    public int getItemCount() {
        return;
    }

    public void setCallbacks(Callbacks callbacks) {
        this.mCallbacks = callbacks;
    }
}   

回答by Jaeger

All above methods worked, but kinda long, so this one worked for me :

以上所有方法都有效，但有点长，所以这个对我有用：

Cardview cardview;
            cardView = (CardView)itemView.findViewById(R.id.cv);

        cardView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent i = new Intent (view.getContext(), DetailsActivity.class);
                i.putExtra("TitleKey",ProbTitle.getText().toString());
                i.putExtra("DescrKey",ProbDescr.getText().toString());
                view.getContext().startActivity(i);
            }
        });

And in Details.java :

在 Details.java 中：

    TextView title;
TextView Descr;
        title = (TextView)findViewById(R.id.details_title);
    Descr = (TextView)findViewById(R.id.details_descr);

    String titleresult = result.getExtras().getString("TitleKey");
    String Descrresult = result.getExtras().getString("DescrKey");

    title.setText(titleresult);
    Descr.setText(Descrresult);

回答by chichiangho

you may try do this on your onItemClick()

您可以尝试在 onItemClick() 上执行此操作

Intent i = new Intent(view.getContext(), DetailsActivity.class); i.putExtra("title", yourTitle); i.putExtra("description", yourDescription); view.getContext().startActivity(i);

Intent i = new Intent(view.getContext(), DetailsActivity.class); i.putExtra("title", yourTitle); i.putExtra("description", yourDescription); view.getContext().startActivity(i);

and when oncreate in your DetailActivity,do this

并在您的 DetailActivity 中创建时，执行此操作

String title = getIntent().getStringExtra("title"); String description = getIntent().getStringExtra("description");

String title = getIntent().getStringExtra("title"); String description = getIntent().getStringExtra("description");

so you can pass title and description to DetailActivity

所以你可以将标题和描述传递给 DetailActivity

回答by Stefan

First of all make your "itemsdata" object to implement Parcelable. You can check it here. In your onItemClick method you pass the object to your Details activity using intent.putExtra("key",listOfDataItems.get(position)); In your DetailsActivity you can get your custom object with getParcelable("key")

首先让你的“itemsdata”对象实现Parcelable。你可以在这里查看。在您的 onItemClick 方法中，您使用 intent.putExtra("key",listOfDataItems.get(position)); 将对象传递给您的 Details 活动。在您的 DetailsActivity 中，您可以使用 getParcelable("key") 获取自定义对象

回答by BNK

IMO, you implement setOnClickListenerinside Adapterof RecyclerView. You can refer to my following sample code, then apply its logic to your code. Hope it helps!

IMO，要实现setOnClickListener内部Adapter的RecyclerView。您可以参考我下面的示例代码，然后将其逻辑应用到您的代码中。希望能帮助到你！

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

    Context mContext;
    List<String> mStringList;

    public MyRVAdapter(Context mContext, List<String> mStringList) {
        this.mContext = mContext;
        this.mStringList = mStringList;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.cardview, parent, false);
        v.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                TextView textView1 = (TextView) v.findViewById(R.id.textView1);
                TextView textView2 = (TextView) v.findViewById(R.id.textView2);
                Bundle bundle = new Bundle();
                bundle.putString("key1", textView1.getText().toString());
                bundle.putString("key2", textView2.getText().toString());

                passToAnotherActivity(bundle);
            }
        });
        return new ViewHolder(v);
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        // do something...
    }

    @Override
    public int getItemCount() {
        if (mStringList != null) {
            return mStringList.size();
        }
        return 0;
    }

    private void passToAnotherActivity(Bundle bundle) {
        if (mContext == null)
            return;
        if (mContext instanceof MainActivity) {
            MainActivity activity = (MainActivity) mContext;
            activity.passToAnotherActivity(bundle); // this method must be implemented inside `MainActivity`
        }
    }

    public static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {

        public ViewHolder(View itemView) {
            super(itemView);
            // do something...
        }

        @Override
        public void onClick(View v) {
        }
    }
}