我正在使用BigNerdRanch库作为我的回收站视图。除了突出显示行之外，我已经修复了所有内容。在LongClick上 具体的卡片没有突出显示。不知道为什么。 OnClick有效，但在取消选择期间将视图突出显示回原始颜色（在我的情况下为白色）不起作用。任何想法或建议。
这是我对RecyclerView的布局：
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/frame_layout_holder">
<android.support.v7.widget.CardView
android:id="@+id/card_holder"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:cardCornerRadius="0dp">
<RelativeLayout
android:id="@+id/card_linear_holder"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:id="@+id/avatar_holder"
android:layout_width="@dimen/profile_pic_size"
android:layout_height="@dimen/profile_pic_size"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_centerVertical="true"
android:layout_marginLeft="@dimen/activity_horizontal_margin"
android:layout_marginRight="@dimen/activity_horizontal_margin"
android:contentDescription="Olla Image" />
<LinearLayout
android:id="@+id/text_holder_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_toEndOf="@+id/avatar_holder"
android:layout_toLeftOf="@+id/checkbox_holder"
android:layout_toRightOf="@+id/avatar_holder"
android:layout_toStartOf="@+id/checkbox_holder"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingEnd="@dimen/activity_horizontal_margin"
android:paddingLeft="0dp"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingStart="0dp"
android:paddingTop="@dimen/activity_vertical_margin">
<TextView
android:id="@+id/text_view1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#ff00ff"
android:textSize="@dimen/list_item_1" />
<TextView
android:id="@+id/text_view2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#ff00ff"
android:textSize="@dimen/list_item_2" />
</LinearLayout>
<LinearLayout
android:id="@+id/checkbox_holder"
android:layout_width="@dimen/check_box_holder_width"
android:layout_height="match_parent"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:gravity="center"
android:orientation="vertical"
android:visibility="gone">
<CheckBox
android:id="@+id/checkbox"
android:layout_width="@dimen/check_box_width"
android:layout_height="@dimen/check_box_width" />
<ImageView
android:id="@+id/delete_row"
android:layout_width="@dimen/check_box_width"
android:layout_height="@dimen/check_box_width"
android:contentDescription="Delete Image"
android:src="@android:drawable/ic_menu_close_clear_cancel"
android:visibility="invisible" />
</LinearLayout>
</RelativeLayout>
</android.support.v7.widget.CardView>
</FrameLayout>
这是我在Holder中实现点击的地方：
public class CustomRecyclerViewHolder extends SwappingHolder implements View.OnClickListener, View.OnLongClickListener {
private TextView mMsg1, mMsg2;
//private ImageView mAvatarView;
private CheckBox mCheckBox;
private LinearLayout checkboxHolder;
private ImageView mDeleteRow;
private CardView cardView;
private Category category;
private CustomRecyclerViewHolder customRecyclerViewHolder;
private int i = 0;
private RelativeLayout relativeLayoutInCardView;
/**
* Initializes all the views of a ViewHolder
*
* @param itemView parent view in which all the List Item views are present
*/
public CustomRecyclerViewHolder(View itemView) {
super(itemView, mycategoryFragment.mMultiSelector);
mMsg1 = (TextView) itemView.findViewById(R.id.text_view1);
mMsg2 = (TextView) itemView.findViewById(R.id.text_view2);
//mAvatarView = (ImageView)itemView.findViewById(R.id.avatar_holder);
mCheckBox = (CheckBox) itemView.findViewById(R.id.checkbox);
checkboxHolder = (LinearLayout) itemView.findViewById(R.id.checkbox_holder);
mDeleteRow = (ImageView) itemView.findViewById(R.id.delete_row);
cardView = (CardView) itemView.findViewById(R.id.card_holder);
relativeLayoutInCardView = (RelativeLayout) itemView.findViewById(R.id.card_linear_holder);
itemView.setOnClickListener(this);
itemView.setLongClickable(true);
itemView.setOnLongClickListener(this);
}
public void bindcategory(Category category) {
this.category = category;
mMsg1.setText(category.getMedicineName());
mMsg2.setText(category.getDescriptionName());
System.out.println("86969696978");
if (mycategoryFragment.mMultiSelector.getSelectedPositions().size()==0) {
relativeLayoutInCardView.setBackgroundColor(Color.BLACK);
}
}
@Override
public void onClick(View v) {
if (category == null) {
return;
}
if (mycategoryFragment.mMultiSelector.tapSelection(this)) {
for (int i = categoryArrayList.size(); i >= 0; i--) {
if (mycategoryFragment.mMultiSelector.isSelected(i, 0)) {
System.out.println("I am at position in OnClick at " + i);
relativeLayoutInCardView.setBackgroundColor(Color.BLACK);
}
if (!mycategoryFragment.mMultiSelector.isSelected(i, 0)) {
System.out.println("I am at position in OnClick at " + i);
relativeLayoutInCardView.setBackgroundColor(Color.WHITE);
}
}
if (mycategoryFragment.mMultiSelector.getSelectedPositions().size()==0) {
isOnLongPressReceived = false;
System.out.println("I am at end");
}
}
}
@Override
public boolean onLongClick(View v) {
if(!isOnLongPressReceived) {
((AppCompatActivity) mContext).startSupportActionMode(mycategoryFragment.mDeleteMode);
mycategoryFragment.mMultiSelector.setSelected(this, true);
for (int i = categoryArrayList.size(); i >= 0; i--) {
if (mycategoryFragment.mMultiSelector.isSelected(i, 0)) {
System.out.println("I am at position in OnLong at " + i);
cardView.setBackgroundColor(Color.BLACK);
}
}
isOnLongPressReceived = true;
}
return true;
}
@Override
public void setSelectable(boolean isSelectable) {
super.setSelectable(isSelectable);
//relativeLayoutInCardView.setBackgroundColor(Color.BLACK);
}
@Override
public void setActivated(boolean isActivated) {
super.setActivated(isActivated);
relativeLayoutInCardView.setBackgroundColor(Color.WHITE);
}
}
答案 0 :(得分：1)
我不知道为什么但是CardView内部的背景不起作用，我正在改变前景。
所以我的行布局是这样的：
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
card_view:cardUseCompatPadding="true"
android:clickable="true"
android:id="@+id/row_note_cardview"
card_view:cardCornerRadius="4dp"
android:foreground="?attr/selectableItemBackgroundBorderless"
card_view:cardElevation="4dp"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/row_note_frame"
android:foreground="@drawable/state">
</FrameLayout>
--- other layouts ---
</android.support.v7.widget.CardView>
我的state.xml：
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:state_selected="true" android:drawable="@null">
<shape android:shape="rectangle" >
<solid android:color="@color/colorSelected" />
<stroke android:width="2dp" android:color="@color/colorSelectedDark" />
</shape>
</item>
<item android:state_selected="false" >
<shape >
<solid android:color="@android:color/transparent" />
</shape>
</item>
</selector>
然后选择项目就像：viewHolder.mFrameLayout.setSelected(false/true);
如果你想查看我的问题：binary-xml-file-line-error-inflating-class-unknown
答案 1 :(得分：0)
由于代码约定不均匀，很难理解代码。然而，当长按并且在取消选择时返回白色时，将卡强调为黑色是固定的。我在你的GitHub仓库上创建了一个拉取请求。您可以在此处查看更改 - https://github.com/kk1429/SampleCategoryApp/pull/1/files
尽管删除存在问题，但它与Multiselect库无关，请在自定义数据库类和自定义适配器中使用delete方法进行检查。