我使用Firebase获得2种类型的数据,并使用RadioButton对显示的数据进行排序。一切似乎都正常,但是当其中一种数据类型被隐藏时,仍然有一个空白空间。告诉我如何正确隐藏/显示数据。
适配器:
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int
viewType) {
switch (viewType) {
case Person.PersonType.TYPE_1:
View userType1 = LayoutInflater.from(parent.getContext())
.inflate(R.layout.driver_row, parent, false);
return new PersonType1ViewHolder(userType1);
case Person.PersonType.TYPE_2:
View userType2 = LayoutInflater.from(parent.getContext())
.inflate(R.layout.fare_row, parent, false);
return new PersonType2ViewHolder(userType2);
}
return super.onCreateViewHolder(parent, viewType);
}
@Override
protected void populateViewHolder(RecyclerView.ViewHolder viewHolder,
Person model,
int position) {
if (viewHolder instanceof PersonType1ViewHolder) {
((PersonType1ViewHolder) viewHolder).time.setText("Full time: " +
model.getTime());
if (activate) {
viewHolder.itemView.setVisibility(View.GONE);
} else {
viewHolder.itemView.setVisibility(View.VISIBLE);
}
return;
}
if (viewHolder instanceof PersonType2ViewHolder) {
((PersonType2ViewHolder) viewHolder).time.setText("Full time2: " +
model.getTime());
if (activate2) {
viewHolder.itemView.setVisibility(View.GONE);
} else {
viewHolder.itemView.setVisibility(View.VISIBLE);
}
private class PersonType1ViewHolder extends RecyclerView.ViewHolder {
TextView time;
PersonType1ViewHolder(View itemView) {
super(itemView);
time = itemView.findViewById(R.id.tv_time);
}
}
private class PersonType2ViewHolder extends RecyclerView.ViewHolder {
TextView time;
PersonType2ViewHolder(View itemView) {
super(itemView);
time = itemView.findViewById(R.id.tv_time_two);
}
}
行的布局相同-wrap_content
<androidx.cardview.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:id="@+id/tv_time"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />
</RelativeLayout>
</androidx.cardview.widget.CardView>
MainActivity XML
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:context=".MainActivity">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/rv_trip_list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="@id/radio_button_group" />
<Button
android:id="@+id/add_trip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentBottom="true"
android:onClick="addTrip"
android:text="add" />
<RadioGroup
android:id="@+id/radio_button_group"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@id/add_trip"
android:layout_centerHorizontal="true"
android:orientation="horizontal">
<RadioButton
android:id="@+id/rb_all"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="true"
android:text="all" />
<RadioButton
android:id="@+id/rb_driver"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="driver" />
<RadioButton
android:id="@+id/rb_fare"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="fare" />
</RadioGroup>
</RelativeLayout>
我也遇到过这样的问题,原来是适配器中的覆盖方法getItemCount()
存在问题。我想如果您指定getItemCount()
的数量,即使您将其隐藏,RecyclerView也会为ViewHolder保留一个位置。这是我如何解决的代码。
override fun getItemViewType(position: Int): Int {
when {
!importantImages.isNullOrEmpty() && !otherImages.isNullOrEmpty() -> {
return when (position) {
0 -> Important.ordinal
else -> Other.ordinal
}
}
otherImages.isNullOrEmpty() -> {
return Important.ordinal
}
importantImages.isNullOrEmpty() -> {
return Other.ordinal
}
}
return 0
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
return when (ViewType.values()[viewType]) {
Important -> {
val layoutInflater = LayoutInflater
.from(parent.context)
.inflate(R.layout.layout_important_list, parent, false)
ImportantViewHolder(layoutInflater)
}
Other -> {
val layoutInflater = LayoutInflater
.from(parent.context)
.inflate(R.layout.layout_other_list, parent, false)
OtherViewHolder(layoutInflater)
}
}
}
override fun getItemCount(): Int = when {
!importantImages.isNullOrEmpty() && !otherImages.isNullOrEmpty() -> {
2
}
importantImages.isNullOrEmpty() && otherImages.isNullOrEmpty() -> {
0
}
else -> {
1
}
}
希望有帮助! :)
问题不是很清楚。但是我可以向您保证,使用View.GONE
,视图将变为不可见而不会留空格。使用View.INVISIBLE
时,视图会留下不可见的空间。如果它不起作用,则表示您的布局有问题。