使用界面将ClickListener设置为RecyclerView

问题描述 投票：12回答：7

我使用RecyclerView适配器在活动内显示数据，我想在活动内实现onClickListener，目前，我像往常一样在适配器内设置onClickListener，效果很好。

public void onBindViewHolder(MyHolder holder, final int position) {
    final Listdata data = listdata.get(position);
    holder.vname.setText(data.getName());

    holder.vname.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Toast.makeText(activity, "clicked on " +position, Toast.LENGTH_SHORT).show();
        }
    });
}

但是我想在活动中实现它，所以我可以更好地控制。这不符合我的目的。我认为这对我们很多人都是有用的。

java android android-recyclerview android-gridview
7个回答
19
投票

您需要在此处检查this tutorial，以更好地了解如何实现所需的行为。

如果要处理活动中的onClickListener，则需要基于带有接口的回调实现。将接口从活动传递到适配器，然后在单击某些项目时从适配器调用回调函数。

这是本教程中的示例实现。

让我们首先拥有界面。 

public interface OnItemClickListener {
    void onItemClick(ContentItem item);
}

您需要修改适配器以将侦听器作为参数，如下所述。 

private final List<ContentItem> items;
private final OnItemClickListener listener;

public ContentAdapter(List<ContentItem> items, OnItemClickListener listener) {
    this.items = items;
    this.listener = listener;
}

现在在onBindViewHolder方法中，设置点击监听器。 

@Override public void onBindViewHolder(ViewHolder holder, int position) {
    holder.bind(items.get(position), listener);
}

public void bind(final ContentItem item, final OnItemClickListener listener) {
    ...
    itemView.setOnClickListener(new View.OnClickListener() {
        @Override public void onClick(View v) {
            listener.onItemClick(item);
        }
    });
}

现在在RecyclerView中设置适配器。 

recycler.setAdapter(new ContentAdapter(items, new ContentAdapter.OnItemClickListener() {
    @Override public void onItemClick(ContentItem item) {
        Toast.makeText(getContext(), "Item Clicked", Toast.LENGTH_LONG).show();
    }
}));

因此整个适配器代码如下所示。 

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

    public interface OnItemClickListener {
        void onItemClick(ContentItem item);
    }

    private final List<ContentItem> items;
    private final OnItemClickListener listener;

    public ContentAdapter(List<ContentItem> items, OnItemClickListener listener) {
        this.items = items;
        this.listener = listener;
    }

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

    @Override public void onBindViewHolder(ViewHolder holder, int position) {
        holder.bind(items.get(position), listener);
    }

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

    static class ViewHolder extends RecyclerView.ViewHolder {

        private TextView name;
        private ImageView image;

        public ViewHolder(View itemView) {
            super(itemView);
            name = (TextView) itemView.findViewById(R.id.name);
            image = (ImageView) itemView.findViewById(R.id.image);
        }

        public void bind(final ContentItem item, final OnItemClickListener listener) {
            name.setText(item.name);
            Picasso.with(itemView.getContext()).load(item.imageUrl).into(image);
            itemView.setOnClickListener(new View.OnClickListener() {
                @Override public void onClick(View v) {
                    listener.onItemClick(item);
                }
            });
        }
    }
}
4
投票

非常简单和干净的解决方案是：

  create a class with the name of RecyclerTouchListener:

    public class RecyclerTouchListener implements RecyclerView.OnItemTouchListener {

        private GestureDetector gestureDetector;
        private ClickListener clickListener;

        public RecyclerTouchListener(Context context, final RecyclerView recyclerView, final ClickListener clickListener) {
            this.clickListener = clickListener;
            gestureDetector = 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.onLongClick(child, recyclerView.getChildPosition(child));
                    }
                }
            });
        }

        @Override
        public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {

            View child = rv.findChildViewUnder(e.getX(), e.getY());
            if (child != null && clickListener != null && gestureDetector.onTouchEvent(e)) {
                clickListener.onClick(child, rv.getChildPosition(child));
            }
            return false;
        }

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

        @Override
        public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {

        }

        public interface ClickListener {
            void onClick(View view, int position);

            void onLongClick(View view, int position);
        }
    }

在您的回收站视图活动中：

recyclerView.addOnItemTouchListener(new RecyclerTouchListener(getApplicationContext(), recyclerView, new RecyclerTouchListener.ClickListener() {
            @Override
            public void onClick(View view, int position) {
                speech(countries_list_code[position]);
            }

            @Override
            public void onLongClick(View view, int position) {

            }
        }));
2
投票

我发现超级傻瓜简单的方法！我推荐这个

示例代码：

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

public interface OnItemClickListener {
    void onItemClick(ContentItem item);
}

private final List<ContentItem> items;
private final OnItemClickListener listener;

public ContentAdapter(List<ContentItem> items, OnItemClickListener listener) {
    this.items = items;
    this.listener = listener;
}

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

@Override public void onBindViewHolder(ViewHolder holder, int position) {
    holder.bind(items.get(position), listener);
}

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

static class ViewHolder extends RecyclerView.ViewHolder {

    private TextView name;
    private ImageView image;

    public ViewHolder(View itemView) {
        super(itemView);
        name = (TextView) itemView.findViewById(R.id.name);
        image = (ImageView) itemView.findViewById(R.id.image);
    }

    public void bind(final ContentItem item, final OnItemClickListener listener) {
        name.setText(item.name);
        Picasso.with(itemView.getContext()).load(item.imageUrl).into(image);
        itemView.setOnClickListener(new View.OnClickListener() {
            @Override public void onClick(View v) {
                listener.onItemClick(item);
            }
        });
    }
}
}

并使用以下代码使用RecyclerView适配器：

recycler.setAdapter(new ContentAdapter(items, new ContentAdapter.OnItemClickListener() {
@Override public void onItemClick(ContentItem item) {
    Toast.makeText(getContext(), "Item Clicked", Toast.LENGTH_LONG).show();
}
}));

我从here找到了这个

希望它对您有所帮助。

1
投票

您可以让您的Activity实现View.OnClickListener并将其传递给适配器。下面是一个示例。

class  RAdapter extends RecyclerView.Adapter<>{
    View.OnClickListener listner;
    public RAdapter(View.OnClickListener listner) {
        this.listner = listner;
    }
    public void onBindViewHolder(MyHolder holder, final int position) {
        holder.vname.setOnClickListener(listner);

    }
}

但是要处理Activity中的点击，您将需要点击位置。您可以将其与adapter.getAdapterPosition()一起使用以验证单击了哪个项目。

此外，如果您已经具有Activity的引用，则可以在适配器内部使用OnClick并调用具有位置执行操作的Activity的公共方法。

处理ViewHolder中点击的更好方法。请参见下面的示例。

class Holder extends RecyclerView.ViewHolder implements View.OnClickListener {
        Button button;
        public Holder(View itemView) {
            super(itemView);
            button=itemView.findViewById(R.id.b1);
            button.setOnClickListener(this);
        }
        @Override
        public void onClick(View v) {
            if(v.getId()==R.id.b1){
                int position=getAdapterPosition();
                // Call a public method of Activity here 
                // with postion
            }
        }
    }
0
投票

如果我理解正确，您想在活动中设置点击逻辑。

您可以通过在Activity中设置OnClickListener并将其传递到Adapter构造函数中来实现。

MyAdapter myAdapter = new MyAdapter(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Toast.makeText(activity, "clicked on " +position, Toast.LENGTH_SHORT).show();
        }
    }));

您的MyAdapter构造函数将是：

final private OnClickListener onClickListener;

public MyAdapter(OnClickListener onClickListener) {
    this.OnClickListener = OnClickListener;
}

所以您的新代码将是这样的

public void onBindViewHolder(MyHolder holder, final int position) {
    final Listdata data = listdata.get(position);
    holder.vname.setText(data.getName());

    holder.vname.setOnClickListener(onClickListener);

}

0
投票

为适配器类创建接口

private OnItemClickListener mListener;

public CustomAdapter(List<Listdata> listdata, OnItemClickListener listener) {
    mListener = listener;
    ...
    ...
}

private class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {

    ViewHolder(View view) {
        ...
        ...
        view.setOnClickLister(this);
    }

    @override
    public void onClick(View v) {
        mListener.onAdapterItemClick(getAdapterPosition())
    }
}

interface OnItemClickListener {
    void onAdapterItemClick(int position);
}

让活动实现界面

public class CustomListActivity extends AppCompatActivity implements OnItemClickListener {

...
...

@override
public void onAdapterItemClick(int position) {
    Toast.makeText(activity, "clicked on " +position, Toast.LENGTH_SHORT).show();
}

还有另一种方法，请查看this实现

-1
投票

我在项目中总是有一个通用适配器，以避免每次我使用Recyclerview时都创建一个Adapter类。这里有一些例子

public class AdapterRecyclerviewTextOnly extends RecyclerView.Adapter<AdapterRecyclerviewTextOnly.ViewHolder> {
private RecyclerView recyclerView;
private OnRecyclerviewListener onRecyclerviewListener;

public interface OnRecyclerviewListener {
    void onRecyclerviewBind(RecyclerView recyclerView, AdapterRecyclerviewTextOnly.ViewHolder viewHolder, int position);
    void onRecyclerviewClick(RecyclerView recyclerView, int position);
    int onItemCount(RecyclerView recyclerView);
}

public void setOnRecyclerviewListener(OnRecyclerviewListener listener) { this.onRecyclerviewListener = listener; }

public AdapterRecyclerviewTextOnly(RecyclerView recyclerView) {
    super();
    this.recyclerView = recyclerView;
}


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

    ViewHolder(RecyclerView recyclerView, View itemView) {
        super(itemView);
        this.recyclerView = recyclerView;
        this.itemView.setOnClickListener(this);

        this.textView = itemView.findViewById(R.id.textview_title);
    }

    void onBind(int position) { onRecyclerviewListener.onRecyclerviewBind(this.recyclerView, this, position); }

    @Override
    public void onClick(View v) {
        onRecyclerviewListener.onRecyclerviewClick(this.recyclerView, getAdapterPosition());
    }
}

@Override
public AdapterRecyclerviewTextOnly.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View inflatedView = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_recyclerview_text_only, parent, false);
    return new ViewHolder(this.recyclerView, inflatedView);
}

@Override
public void onBindViewHolder(AdapterRecyclerviewTextOnly.ViewHolder holder, int position) {
    holder.onBind(position);
}

@Override
public int getItemCount() {
    return onRecyclerviewListener.onItemCount(this.recyclerView);
}
}

然后在您的活动类中，可以将此适配器与：一起使用]

    this.recyclerView = findViewById(R.id.recyclerview);
    this.recyclerView.setHasFixedSize(true);
    this.recyclerView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));
    AdapterRecyclerviewTextOnly recyclerViewAdapter = new AdapterRecyclerviewTextOnly(this.recyclerView);
    this.recyclerView.setAdapter(this.recyclerViewAdapter);
    this.recyclerViewAdapter.setOnRecyclerviewListener(new AdapterRecyclerviewTextOnly.OnRecyclerviewListener() {
        @Override
        public void onRecyclerviewBind(RecyclerView recyclerView, AdapterRecyclerviewTextOnly.ViewHolder viewHolder, int position) {

        }

        @Override
        public void onRecyclerviewClick(RecyclerView recyclerView, int position) {

        }

        @Override
        public int onItemCount(RecyclerView recyclerView) { 
}
});

您也可以将其与2或3个recyclerview一起使用。首先，声明一个globar侦听器private AdapterRecyclerviewTextOnly.OnRecyclerviewListener listener;。

然后使用新对象初始化侦听器，然后使用侦听器设置每个recyclerview。使用特定的标识符：

if (recyclerView == recyclerViewA){ } else if (recyclerView == recyclerViewB) { }在适配器内部管理您的recyclerview。

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