RecyclerView:如何添加 OnClick() 并保持 onLongClick() 工作? [英] RecyclerView: how to add OnClick() and keep onLongClick() working?
问题描述
我在 CheckBox 上设置了一个 onClickListener，用于保存 CardView 列表的 RecyclerView.侦听器设置在我的 ItemHolder 中，它扩展了 ViewHolder.对 CardView 的初始点击检查 CheckBox 并将 CardView 的背景颜色从默认的白色切换为红色.这工作正常.
I have an onClickListener set on a CheckBox for a RecyclerView that holds a list of CardViews. The listener is set up in my ItemHolder that extends ViewHolder. An initial click on a CardView checks the CheckBox and toggles the CardView's background color from the default white color to red. This is working properly.
我还在 CardView 本身上设置了一个 OnClickListener.OnClickListener 设置在 onCreateViewHolder() 中.单击 CardView 会为 CardView 启动一个新的 Detail Activity.这工作正常.
I also have an OnClickListener set up on the CardView itself. The OnClickListener is set up in the onCreateViewHolder(). A click on the CardView launches a new Detail Activity for the CardView. This is working properly.
最后，我尝试在 CardView 本身上设置一个 onLongClickListener.OnLongClickListener 在 onCreateViewHolder() 中设置.长按 CardView 意味着将背景颜色切换为红色并启动 AlertDialog，以便用户可以确认 CardView 将从列表中删除.这可以正常工作，但是当将此代码添加到适配器时，CardView 的 CheckBox 的 OnClickListerner 不再起作用.就好像 OnLongClickListner 与 CheckBox 侦听器发生冲突.注意我在 itemHolder 的 onLongClick() 代码中返回真".我在这里错过了什么?
Lastly, I tried to set up an onLongClickListener on the CardView itself. The OnLongClickListener is set up in the onCreateViewHolder(). A longpress on the CardView is meant to toggle the background color to red and launch an AlertDialog so the user can confirm that the CardView will be deleted from the list. This works properly but when this code is added to the Adapter then the OnClickListerner for the CardView's CheckBox no longer works. It is as if the the OnLongClickListner is in conflict with the CheckBox listener. Note I do "return true" in the itemHolder's onLongClick() code. What am I missing here?
适配器.java
public MyRecylerAdapter(Context context, ArrayList<ListItem> listItems, ArrayList<ListItem> selectedList) {
this.mContext = context;
this.mListItems = listItems;
this.selectedItemsList = selectedList;
}
private int selectedPos = -1;
...
private class ItemHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
private CardView cardView;
private CheckBox chkSelected;
private ItemHolder(final View itemView) {
super(itemView);
cardView = (CardView) itemView.findViewById(R.id.singlecard_view1);
chkSelected = (CheckBox) itemView.findViewById(R.id.chkSelected);
chkSelected.setOnClickListener(this);
}
public void onClick(View v) {
int adapterPos = getAdapterPosition();
if (adapterPos == android.support.v7.widget.RecyclerView.NO_POSITION) return;
if (recyclerItemClickListener !=null) {
recyclerItemClickListener.onCheckBoxClick(v, adapterPos);
}
Integer iPos = adapterPos;
if (((CheckBox)v).isChecked()) {
checkedListItems.add(iPos);
}
else {
checkedListItems.remove(iPos);
}
}
void bind(int position) {
if (checkedListItems.contains(position)) {
chkSelected.setChecked(true);
}
else {
chkSelected.setChecked(false);
}
}
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_contact_item, parent, false);
final ItemHolder itemHolder = new ItemHolder(view);
itemHolder.itemView.setOnClickListener(new View.OnClickListener() {
// Handles the row being clicked.
@Override
public void onClick(View view) {
ListItem adapterItem = MyRecylerAdapter.this.getItem(itemHolder.getAdapterPosition());
if (recyclerItemClickListener != null) {
recyclerItemClickListener.onItemClick(itemHolder.itemView, adapterItem);
}
}
});
itemHolder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View view) {
ListItem adapterItem2 = MyRecylerAdapter.this.getItem(itemHolder.getAdapterPosition());
if (recyclerItemClickListener != null) {
recyclerItemClickListener.onItemLongClick(itemHolder.itemView, adapterItem2);
}
int adapterPos2 = itemHolder.getAdapterPosition();
if (adapterPos2 != android.support.v7.widget.RecyclerView.NO_POSITION) {
int lastSelectedPosition = selectedPos;
selectedPos = adapterPos2;
notifyItemChanged(lastSelectedPosition);
notifyItemChanged(selectedPos);
}
return true;
}
});
return itemHolder;
}
public void onBindViewHolder(final RecyclerView.ViewHolder holder, int position) {
final ListItem listItem = mListItems.get(position);
final ItemHolder itemHolder = (ItemHolder) holder;
itemHolder.bind(position);
if (checkedListItems.contains(position)) {
itemHolder.cardView.setActivated(true);
}
else {
itemHolder.cardView.setActivated(false);
}
// **The addition of the below code causes the "itemHolder.cardView.
// setActivated(true);" in onBindViewHolder method to no longer fire, as
// a click on the CheckBox no longer changes the CardView background
// color.**
if (itemHolder.getAdapterPosition() == selectedPos) {
itemHolder.cardView.setActivated(true);
} else {
itemHolder.cardView.setActivated(false);
}
list_contact_item.xml
list_contact_item.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/singlecard_view1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:foreground="?android:attr/selectableItemBackground"
>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/statelist_cardview_background" >
<CheckBox
android:id="@+id/chkSelected"
android:layout_width="wrap_content"
android:layout_height="30dp"
android:layout_alignParentTop="true"
android:layout_alignParentStart="true"
android:layout_alignParentLeft="true"
android:layout_marginLeft="4dp"
android:layout_marginStart="4dp"
android:layout_marginTop="4dp"
android:gravity="center" />
<TextView
android:id="@+id/cardType1"
android:layout_width="wrap_content"
android:layout_height="30dp"
android:layout_toRightOf="@+id/chkSelected"
android:layout_toEndOf="@+id/chkSelected"
android:layout_alignParentTop="true"
android:paddingStart="3dp"
android:paddingLeft="3dp"
android:paddingEnd="6dp"
android:paddingRight="6dp"
android:layout_marginTop="4dp"
android:gravity="center"
android:textColor="#ffffff"
android:textStyle="bold|italic"
style="@style/Base.TextAppearance.AppCompat.Subhead" />
<TextView
android:id="@+id/cardBlankText1"
android:layout_width="wrap_content"
android:layout_height="30dp"
android:layout_alignParentTop="true"
android:layout_toRightOf="@+id/cardType1"
android:layout_toEndOf="@+id/cardType1"
android:layout_toLeftOf="@+id/cardBlankTextNumstotal"
android:layout_toStartOf="@+id/cardBlankTextNumstotal"
android:layout_marginTop="4dp"
android:gravity="center_vertical|end"
android:text="#"
android:textColor="@color/colorFlLabelFinal"
android:textStyle="bold"
android:maxLines="1"
style="@style/Base.TextAppearance.AppCompat.Subhead" />
<TextView
android:id="@+id/cardBlankTextNumstotal"
android:layout_width="wrap_content"
android:layout_height="30dp"
android:layout_alignParentTop="true"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:gravity="center"
android:text="actual card #"
android:layout_marginTop="4dp"
android:layout_marginRight="4dp"
android:layout_marginEnd="4dp"
android:freezesText="true"
android:textColor="@android:color/black"
android:maxLines="1"
style="@style/Base.TextAppearance.AppCompat.Subhead" />
<TextView
android:id="@+id/cardBlankText2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_below="@+id/chkSelected"
android:layout_marginTop="4dp"
android:layout_marginLeft="6dp"
android:layout_marginStart="6dp"
android:text="todo"
android:textColor="@android:color/black"
android:textStyle="bold"
android:background="@drawable/todo_underline"
android:maxLines="1"
style="@style/Base.TextAppearance.AppCompat.Headline" />
...
</RelativeLayout>
</android.support.v7.widget.CardView>
statelist_cardview_background.xml
statelist_cardview_background.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_activated="true"
android:drawable="@color/item_selected" />
<item android:state_activated="false"
android:drawable="@color/list_contact_item_default" />
</selector>
颜色.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<color name="list_contact_item_default">#FFFFFF</color>
<color name="item_selected">#FF0000</color>
</resources>
推荐答案
您似乎在这里尝试解决错误的问题.您不应该设置点击&卡片视图上的长按侦听器本身.
It seems you are trying to solve the wrong problem here. You should not set click & long click listeners on card view itself.
- 您可以在 Checkbox 上设置点击侦听器或选中的ChangeListener
- 点击 &长点击侦听器可以位于 view_container 的其余部分
- You can have click listener OR checkedChangeListener on Checkbox
- click & long click listeners can be on rest of the view_container
在这里，如果您想选中/取消选中复选框以及点击 view_container，您可以在 view_container 的 onClick 侦听器中轻松完成.
Here if you want to check/uncheck the checkbox also on click of view_container, you can easily do it in view_container's onClick listener.
编辑:我已经更新了你的布局文件，注意现在你在 FrameLayout 上作为 RelativeLayout(view_container) & 的父级.复选框.
Edit: I have updated your layout file, notice now you have on FrameLayout as parent of RelativeLayout(view_container) & Checkbox.
由于 Checkbox 是在 RelativeLayout 之后添加的，它将在 view_container 之上可见.希望它对你有用.
As Checkbox is added after RelativeLayout it will be visible on top of view_container. Hope it will work for you.
现在您可以设置点击监听器正如我上面解释的.
Now you can set click listeners as I explained above.
更新布局文件
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/singlecard_view1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:foreground="?android:attr/selectableItemBackground"
>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:id="@+id/view_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/statelist_cardview_background" >
<TextView
android:id="@+id/cardType1"
android:layout_width="wrap_content"
android:layout_height="30dp"
android:layout_marginLeft="30dp"
android:layout_marginStart="30dp"
android:layout_alignParentTop="true"
android:paddingStart="3dp"
android:paddingLeft="3dp"
android:paddingEnd="6dp"
android:paddingRight="6dp"
android:layout_marginTop="4dp"
android:gravity="center"
android:textColor="#ffffff"
android:textStyle="bold|italic"
style="@style/Base.TextAppearance.AppCompat.Subhead" />
<TextView
android:id="@+id/cardBlankText1"
android:layout_width="wrap_content"
android:layout_height="30dp"
android:layout_alignParentTop="true"
android:layout_toRightOf="@+id/cardType1"
android:layout_toEndOf="@+id/cardType1"
android:layout_toLeftOf="@+id/cardBlankTextNumstotal"
android:layout_toStartOf="@+id/cardBlankTextNumstotal"
android:layout_marginTop="4dp"
android:gravity="center_vertical|end"
android:text="#"
android:textColor="@color/colorFlLabelFinal"
android:textStyle="bold"
android:maxLines="1"
style="@style/Base.TextAppearance.AppCompat.Subhead" />
<TextView
android:id="@+id/cardBlankTextNumstotal"
android:layout_width="wrap_content"
android:layout_height="30dp"
android:layout_alignParentTop="true"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:gravity="center"
android:text="actual card #"
android:layout_marginTop="4dp"
android:layout_marginRight="4dp"
android:layout_marginEnd="4dp"
android:freezesText="true"
android:textColor="@android:color/black"
android:maxLines="1"
style="@style/Base.TextAppearance.AppCompat.Subhead" />
<TextView
android:id="@+id/cardBlankText2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="34dp"
android:layout_marginLeft="6dp"
android:layout_marginStart="6dp"
android:text="todo"
android:textColor="@android:color/black"
android:textStyle="bold"
android:background="@drawable/todo_underline"
android:maxLines="1"
style="@style/Base.TextAppearance.AppCompat.Headline" />
...
</RelativeLayout>
<CheckBox
android:id="@+id/chkSelected"
android:layout_width="wrap_content"
android:layout_height="30dp"
android:layout_alignParentTop="true"
android:layout_alignParentStart="true"
android:layout_alignParentLeft="true"
android:layout_marginLeft="4dp"
android:layout_marginStart="4dp"
android:layout_marginTop="4dp"
android:gravity="center" />
</FrameLayout>
</android.support.v7.widget.CardView>
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