在 RecyclerView 中使用 onClick() 启动新活动 [英] Start new Activity with onClick() in RecyclerView

问题描述

我想使用 onClick() 方法进入一个新活动，但我的代码不起作用.你能不能提供一些建议.我对 recyclerView 有一些问题，因为它对我来说相当新.谢谢

I want to go into a new Activity with the onClick() method but my code is not working. Can you please offer some advice. I have some issues with the recyclerView, since it's fairly new for me. Thank you

public class FragmentOne extends Fragment {

        @Nullable
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
            RecyclerView recyclerView = (RecyclerView) inflater.inflate(
                    R.layout.recycleview, container, false);
            ContentAdapter adapter = new ContentAdapter();
            recyclerView.setAdapter(adapter);

            recyclerView.setHasFixedSize(true);
            recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
            return recyclerView;
        }

        public class ContentAdapter extends RecyclerView.Adapter<ContentAdapter.ViewHolder> {
            private static final int LENGTH = 50;

            public ContentAdapter() {
            }

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

                public ViewHolder(LayoutInflater inflater, ViewGroup parent) {
                    super(inflater.inflate(R.layout.fragment_channel, parent, false));
                }

                @Override
                public void onClick(View v) {
                    Intent intent = new Intent(getActivity(), ChannelDetailActivity.class);
                    startActivity(intent);
                }
            }

            @Override
            public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

                ViewHolder viewHolder = new ViewHolder (LayoutInflater.from(parent.getContext()), parent);
                return viewHolder;

            }

            @Override
            public void onBindViewHolder(ViewHolder holder, int position) {
            }

            @Override
            public int getItemCount() {
                return LENGTH;
            }
        }

    }

<?xml version="1.0" encoding="utf-8"?>

<android.support.v7.widget.RecyclerView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/my_recycler_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:clipToPadding="false"
    android:paddingBottom="16dp"
    android:paddingTop="16dp"
    android:scrollbars="vertical"
    android:elevation="5dp"
    android:fadingEdgeLength="@dimen/cardview_compat_inset_shadow"
    app:layout_behavior="@string/appbar_scrolling_view_behavior" />

<?xml version="1.0" encoding="utf-8"?>



<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="360dp"
    android:layout_height="wrap_content"
    android:padding="16dp"
    android:layout_marginBottom="1dp"
    android:elevation="2dp"
    android:layout_gravity="center_horizontal"
    android:background="#FFFF">



    <ImageView
        android:id="@+id/user_image"
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:scaleType="centerCrop"
        android:src="@drawable/userone" />

    <TextView
        android:id="@+id/user_name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="16dp"
        android:layout_toRightOf="@+id/user_image"
        android:text="Chuck Reich"
        android:paddingBottom="3dp"
        android:textAppearance="?attr/textAppearanceListItem"
        android:textSize="20sp" />

    <TextView
        android:id="@+id/user_desc"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/user_name"
        android:layout_marginLeft="16dp"
        android:layout_toRightOf="@+id/user_image"
        android:textColor="#a9a9a9"
        android:ellipsize="end"
        android:singleLine="true"
        android:text="Horizon Media Studios"
        android:textAppearance="?attr/textAppearanceListItem"
        android:paddingBottom="2dp"
        android:textSize="14sp" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceSmall"
        android:text="3928"
        android:paddingRight="18dp"
        android:id="@+id/textView2"
        android:textColor="#a9a9a9"
        android:textSize="12sp"
        android:layout_below="@+id/user_desc"
        android:layout_alignStart="@+id/user_desc" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceSmall"
        android:text="3402"
        android:id="@+id/textView3"
        android:textColor="#a9a9a9"
        android:textSize="12sp"
        android:layout_below="@+id/user_desc"
        android:layout_toEndOf="@+id/textView2" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceSmall"
        android:text="2354"
        android:paddingLeft="20dp"
        android:id="@+id/textView4"
        android:textColor="#a9a9a9"
        android:textSize="12sp"
        android:layout_below="@+id/user_desc"
        android:layout_centerHorizontal="true" />

</RelativeLayout>

推荐答案

我找到了解决方案！:) 在 ViewHolder 类中使用 itemView 来处理 Recyclerview 中的项目单击:

I found the solution!:) There's this way of handling item click in Recyclerview with itemView given within the ViewHolder class:

 public static class ViewHolder extends RecyclerView.ViewHolder {
        public ViewHolder(LayoutInflater inflater, ViewGroup parent) {
            super(inflater.inflate(R.layout.fragment_channel, parent, false));
            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Context context = v.getContext();
                    Intent intent = new Intent(context, ChannelDetailActivity.class);
                    context.startActivity(intent);
                }
            });
        }
    }

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