有人使用RecyclerView找到了一种方法来设置一个onClickListener的项目在RecyclerView? 我想设置一个监听器为每个项目的布局,但这似乎有点太麻烦了 我确信有一种方法让RecyclerView监听onClick事件,但我不能完全弄清楚。
当前回答
对我来说,这是最好的方法:
class YourRecyclerAdapter extends RecyclerView.Adapter<ContactViewHolder> implements View.OnClickListener {
...
@Override
public void onClick(View view) {
int itemPosition = vRecycle.getChildPosition(view);
//And use itemPosition to get the item from your collection. This way you dont restrain the ViewHolder with a OnClick callback
}
...
}
其他回答
将类标记为抽象并实现OnClick方法
public abstract class MainGridAdapter extends
RecyclerView.Adapter<MainGridAdapter.ViewHolder> {
private List<MainListItem> mDataset;
// Provide a reference to the views for each data item
// Complex data items may need more than one view per item, and
// you provide access to all the views for a data item in a view holder
public class ViewHolder extends RecyclerView.ViewHolder {
// each data item is just a string in this case
public TextView txtHeader;
public TextView txtFooter;
public ViewHolder(View v) {
super(v);
txtHeader = (TextView) v.findViewById(R.id.firstLine);
txtFooter = (TextView) v.findViewById(R.id.secondLine);
}
}
public void add(int position, MainListItem item) {
mDataset.add(position, item);
notifyItemInserted(position);
}
public void remove(MainListItem item) {
int position = mDataset.indexOf(item);
mDataset.remove(position);
notifyItemRemoved(position);
}
// Provide a suitable constructor (depends on the kind of dataset)
public MainGridAdapter(List<MainListItem> myDataset) {
mDataset = myDataset;
}
// Create new views (invoked by the layout manager)
@Override
public MainGridAdapter.ViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
// create a new view
View v = LayoutInflater.from(parent.getContext()).inflate(
R.layout.list_item_grid_line, parent, false);
// set the view's size, margins, paddings and layout parameters
ViewHolder vh = new ViewHolder(v);
return vh;
}
// Replace the contents of a view (invoked by the layout manager)
@Override
public void onBindViewHolder(final ViewHolder holder, final int position) {
// - get element from your dataset at this position
// - replace the contents of the view with that element
OnClickListener clickListener = new OnClickListener() {
@Override
public void onClick(View v) {
onItemClicked(position);
}
};
holder.itemView.setOnClickListener(clickListener);
holder.txtHeader.setOnClickListener(clickListener);
holder.txtFooter.setOnClickListener(clickListener);
final MainListItem item = mDataset.get(position);
holder.txtHeader.setText(item.getTitle());
if (TextUtils.isEmpty(item.getDescription())) {
holder.txtFooter.setVisibility(View.GONE);
} else {
holder.txtFooter.setVisibility(View.VISIBLE);
holder.txtFooter.setText(item.getDescription());
}
}
// Return the size of your dataset (invoked by the layout manager)
@Override
public int getItemCount() {
return mDataset.size();
}
public abstract void onItemClicked(int position);
}
在绑定事件中实现单击处理程序,使其只有一个事件实现
执行此:
mAdapter = new MainGridAdapter(listItems) {
@Override
public void onItemClicked(int position) {
showToast("Item Clicked: " + position, ToastPlus.STYLE_INFO);
}
};
同样可以做长时间点击
由于API已经发生了根本性的变化,如果你要为每个项目创建一个OnClickListener,这不会让我感到惊讶。不过也没那么麻烦。在你的RecyclerView的实现中。适配器<MyViewHolder>,你应该有:
private final OnClickListener mOnClickListener = new MyOnClickListener();
@Override
public MyViewHolder onCreateViewHolder(final ViewGroup parent, final int viewType) {
View view = LayoutInflater.from(mContext).inflate(R.layout.myview, parent, false);
view.setOnClickListener(mOnClickListener);
return new MyViewHolder(view);
}
onClick方法:
@Override
public void onClick(final View view) {
int itemPosition = mRecyclerView.getChildLayoutPosition(view);
String item = mList.get(itemPosition);
Toast.makeText(mContext, item, Toast.LENGTH_LONG).show();
}
我已经看了所有的答案,并不是很满意。我找到了更简单快捷的方法。想分享给未来的读者。
选择单个回收项目中的任何视图。 获取这个View的父视图(确保你施放了合适的ViewGroup) 将onClickListener设置为这个父节点。
示例代码(它是在适配器的onBindViewHolder方法中编写的):
@Override
public void onBindViewHolder(@NonNull final ViewHolder holder, final int position) {
ConstraintLayout parent = (ConstraintLayout) holder.title.getParent();
parent.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(context, "Clicked recycler view item at position " + position, Toast.LENGTH_SHORT).show();
}
});
}
查看类似的问题@CommonsWare的评论链接到this,它在viewHolder中实现了OnClickListener接口。
下面是ViewHolder的一个简单例子:
/** Declare global with in adapter class. */
TextView textView;
public static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
private ViewHolder(View itemView) {
super(itemView);
itemView.setOnClickListener(this);
textView = (TextView) view.findViewById(android.R.id.text1);
}
@Override
public void onClick(View view) {
Toast.makeText(view.getContext(), "position = " + getLayoutPosition(), Toast.LENGTH_SHORT).show();
/** Go through each item if you have few items within RecyclerView. */
if (getLayoutPosition() == 0) {
// Do whatever you want here
} else if(getLayoutPosition() == 1) {
// Do whatever you want here
} else if(getLayoutPosition() == 2) {
// Do whatever you want here
}
/** Or you can use For loop if you have long list of items. */
for (int i = 0; i < exampleList.size(); i++) {
// Do whatever you want here
}
}
}
在你的RecyclerView中创建ViewHolder。适配器看起来像这样:
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(parent.getContext())
View view = inflater.inflate(android.R.layout.simple_list_item_1, parent, false);
return new ViewHolder(view);
}
通常你在CardView中有多个元素,所以你需要一个布局视图来包装和组织它们。你可以添加一个OnClickListener到那个布局视图。1. 添加一个id到你的布局。在这个例子中是线性布局
<android.support.v7.widget.CardView
.....>
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/card_view_linearLayout">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="name"
android:id="@+id/card_view_name" />
...
</LinearLayout>
</android.support.v7.widget.CardView>
2美元。在你的内部ViewHolder类中获取布局视图。
public static class ViewHolder extends RecyclerView.ViewHolder{
private TextView nameView;
...
private LinearLayout linearLayout;
public ViewHolder(View itemView) {
super(itemView);
nameView = (TextView)itemView.findViewById(R.id.card_view_name);
...
linearLayout = (LinearLayout)itemView.findViewById(R.id.card_view_linearLayout);
}
}
3美元。将监听器添加到onBindViewHolder中的布局中,并使用回调将数据发送到活动或片段(未测试)。
@Override
public void onBindViewHolder(TrackAdapter.ViewHolder holder, final int position) {
String str = mStringList.get(position);
holder.nameView.setText(str);
...
holder.linearLayout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
callback.itemCallback(mStringList.get(position));
}
});
}
如何使用回调是另一个故事
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