问题
I have this RecyclerView, which in it every item has a RecyclerView inside of it:
fragment_active_goals.xml (contains the outer recyclerview):
<?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"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/parent"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".fragments.ActiveGoalsFragment">
<androidx.coordinatorlayout.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/light_gray"
android:clipChildren="false"
android:clipToPadding="false"
android:nestedScrollingEnabled="false"
android:scrollbars="vertical" />
</RelativeLayout>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="@+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="20dp"
android:src="@drawable/plus"
app:fabSize="normal" />
<com.github.mmin18.widget.RealtimeBlurView
android:id="@+id/blur_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:realtimeBlurRadius="20dp"
app:realtimeOverlayColor="#8000"
android:elevation="5dp"
android:visibility="gone"/>
<com.google.android.material.circularreveal.CircularRevealFrameLayout
android:id="@+id/fragment_container"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:elevation="10dp"
android:layout_margin="15dp"
android:visibility="invisible"
app:layout_behavior="com.google.android.material.transformation.FabTransformationSheetBehavior">
<com.google.android.material.card.MaterialCardView
android:id="@+id/dialog"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
app:cardCornerRadius="15dp"
app:cardPreventCornerOverlap="true">
<RelativeLayout
android:id="@+id/pr"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/add_new_active_activity_dialog_background"
android:gravity="center"
android:padding="15dp">
<TextView
android:id="@+id/name_label"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="@string/name_of_new_goal_label_dialog"
android:textSize="20sp" />
<EditText
android:id="@+id/name_et"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/name_label"
android:hint="@string/name_of_new_goal_hint_dialog"
android:textSize="20sp" />
<TextView
android:id="@+id/description_label"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/name_et"
android:layout_gravity="center"
android:text="@string/description_of_new_goal_label_dialog"
android:textSize="20sp" />
<EditText
android:id="@+id/description_et"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/description_label"
android:hint="@string/description_of_new_goal_hint_dialog"
android:textSize="20sp" />
<RelativeLayout
android:id="@+id/cancel_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/description_et"
android:layout_alignStart="@id/name_et"
android:layout_margin="15dp"
android:background="@drawable/ripple_button_background"
android:clickable="true"
android:elevation="8dp"
android:focusable="true"
android:padding="15dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/cancel_adding_new_goal_dialog_button_text"
android:textAllCaps="false"
android:textColor="@color/brain1" />
</RelativeLayout>
<RelativeLayout
android:id="@+id/add_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/description_et"
android:layout_alignEnd="@id/description_et"
android:layout_margin="15dp"
android:background="@drawable/ripple_button_background"
android:clickable="true"
android:elevation="8dp"
android:focusable="true"
android:padding="15dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/add_new_goal_dialog_button_text"
android:textAllCaps="false"
android:textColor="@color/brain1" />
</RelativeLayout>
</RelativeLayout>
</com.google.android.material.card.MaterialCardView>
</com.google.android.material.circularreveal.CircularRevealFrameLayout>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
</FrameLayout>
outer_item.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:clickable="true"
android:focusable="true">
<FrameLayout
android:id="@+id/cardHolder"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<androidx.cardview.widget.CardView
android:id="@+id/acardView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
app:cardCornerRadius="15dp"
app:cardElevation="10dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:id="@+id/aroot_view_per_active_goal"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:id="@+id/aactive_goal_card"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="4dp"
android:orientation="horizontal"
android:padding="10dp"
android:weightSum="11">
<com.example.performancemeasurement.customViews.CustomProgressBar.CustomProgressBar
android:id="@+id/aactive_goal_item_progress_bar"
android:layout_width="0dp"
android:layout_height="50dp"
android:layout_weight="9"
android:transitionName="progressBar"
android:visibility="visible"
app:enable_gradient="true" />
<ImageButton
android:id="@+id/aactive_goal_item_edit_image_button"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="?attr/selectableItemBackground"
android:contentDescription="shrunk"
android:scaleType="fitCenter"
android:src="@drawable/edit_vector" />
<ImageButton
android:id="@+id/aactive_goal_item_open_close_image_button"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="?attr/selectableItemBackground"
android:contentDescription="shrunk"
android:scaleType="fitCenter"
android:src="@drawable/down_vector" />
</LinearLayout>
<RelativeLayout
android:id="@+id/aexpanded_active_goal_card"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="4dp"
android:visibility="visible">
<androidx.constraintlayout.widget.ConstraintLayout
android:id="@+id/aactive_goal_item_back_to_parent_image_button_container"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:clickable="false"
android:focusable="false"
android:layout_alignParentTop="true"
android:layout_alignParentStart="true"
android:layout_alignBottom="@id/aexpanded_active_goal_card_label">
<ImageButton
android:id="@+id/aactive_goal_item_back_to_parent_image_button"
android:layout_width="0dp"
android:layout_height="match_parent"
app:layout_constraintDimensionRatio="1:1"
android:src="@drawable/ic_arrow_back_black_24dp"
android:background="?attr/selectableItemBackground"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>
<TextView
android:id="@+id/aexpanded_active_goal_card_label"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:layout_centerHorizontal="true"
android:text="Goal Name"
android:textColor="@android:color/black"
android:textSize="40sp"
android:textStyle="bold" />
<com.developer.mtextfield.TextFieldBoxes
android:id="@+id/aexpanded_active_goal_card_edit_label_field_box"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:layout_centerHorizontal="true"
app:labelText="Goal Name:"
android:visibility="invisible" >
<com.developer.mtextfield.ExtendedEditText
android:id="@+id/aexpanded_active_goal_card_edit_label_edit_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</com.developer.mtextfield.TextFieldBoxes>
<com.example.performancemeasurement.customViews.CustomProgressBar.CustomProgressBar
android:id="@+id/aexpanded_active_goal_card_progress_bar"
android:layout_width="wrap_content"
android:layout_height="30dp"
android:layout_below="@id/aexpanded_active_goal_card_label"
android:layout_alignParentStart="true"
android:layout_alignParentEnd="true"
android:layout_marginStart="20dp"
android:layout_marginEnd="20dp"
android:layout_centerHorizontal="true"
android:transitionName="progressBar"
app:enable_gradient="true" />
<TextView
android:id="@+id/aexpanded_active_goal_card_description"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/aexpanded_active_goal_card_progress_bar"
android:layout_centerHorizontal="true"
android:layout_margin="10dp"
android:maxLines="3"
android:text="Goal's Description"
android:textColor="#6F6F6F"
android:textSize="20sp"
android:textStyle="normal" />
<com.developer.mtextfield.TextFieldBoxes
android:id="@+id/aexpanded_active_goal_card_edit_description_field_box"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/aexpanded_active_goal_card_progress_bar"
android:layout_centerHorizontal="true"
android:layout_margin="10dp"
app:labelText="Goal Description:"
android:visibility="invisible" >
<com.developer.mtextfield.ExtendedEditText
android:id="@+id/aexpanded_active_goal_card_edit_description_edit_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"/>
</com.developer.mtextfield.TextFieldBoxes>
<LinearLayout
android:id="@+id/aexpanded_active_goal_card_sub_goals_label_container"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/aexpanded_active_goal_card_description"
android:layout_centerHorizontal="true"
android:layout_margin="5dp"
android:gravity="center_vertical"
android:orientation="horizontal"
android:weightSum="14">
<View
android:id="@+id/aexpanded_active_goal_card_sub_goal_label_left"
android:layout_width="0dp"
android:layout_height="3dp"
android:layout_weight="4"
android:background="@color/light_gray" />
<TextView
android:id="@+id/aexpanded_active_goal_card_sub_goals_label"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:layout_weight="6"
android:gravity="center"
android:text="SubGoals"
android:textColor="#5A5A5A"
android:textSize="25sp"
android:textStyle="bold" />
<View
android:id="@+id/aexpanded_active_goal_card_sub_goal_label_right"
android:layout_width="0dp"
android:layout_height="3dp"
android:layout_weight="4"
android:background="@color/light_gray" />
</LinearLayout>
<RelativeLayout
android:id="@+id/aexpanded_active_goal_card_sub_goals_container"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/aexpanded_active_goal_card_sub_goals_label_container"
android:layout_centerHorizontal="true"
android:layout_margin="10dp"
android:animateLayoutChanges="true"
android:elevation="15dp"
android:gravity="center">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/aexpanded_active_goal_card_sub_goals_recycler_view"
android:layout_width="match_parent"
android:layout_height="100dp"
android:nestedScrollingEnabled="true" />
</RelativeLayout>
</RelativeLayout>
</RelativeLayout>
<androidx.constraintlayout.widget.ConstraintLayout
android:id="@+id/edit_panel"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="4dp"
android:layout_below="@id/aroot_view_per_active_goal"
android:visibility="gone">
<RelativeLayout
android:id="@+id/edit_delete_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="15dp"
android:elevation="8dp"
android:padding="15dp"
android:clickable="true"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
android:focusable="true"
android:background="@drawable/delete_goal_button_background">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAllCaps="false"
android:textColor="@android:color/white"
android:text="@string/active_goal_item_delete_button_text"/>
</RelativeLayout>
<RelativeLayout
android:id="@+id/edit_cancel_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="15dp"
android:elevation="8dp"
android:padding="15dp"
android:clickable="true"
app:layout_constraintEnd_toStartOf="@id/edit_save_button"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
android:focusable="true"
android:background="@drawable/cancel_edits_button_background">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAllCaps="false"
android:textColor="@android:color/white"
android:text="@string/active_goal_item_cancel_edits_button_text"/>
</RelativeLayout>
<RelativeLayout
android:id="@+id/edit_save_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="15dp"
android:elevation="8dp"
android:padding="15dp"
android:clickable="true"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
android:focusable="true"
android:background="@drawable/save_edits_button_background">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAllCaps="false"
android:textColor="@android:color/white"
android:text="@string/active_goal_item_save_edits_button_text"/>
</RelativeLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
</RelativeLayout>
</androidx.cardview.widget.CardView>
</FrameLayout>
<com.github.mmin18.widget.RealtimeBlurView
android:id="@+id/ablur"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/cardHolder"
android:layout_alignBottom="@id/cardHolder"
app:realtimeBlurRadius="20dp"
app:realtimeOverlayColor="#8000"
android:visibility="invisible"/>
</RelativeLayout>
For the inner RecyclerView I use this library (this answer explains how the inner RecyclerView works). Right now the inner RecyclerView won't scroll, but instead, the outer one will. How can I make the inner RecyclerView scrollable instead of scrolling the outer RecyclerView?
Also, I want to be able to swipe horizontally too, not only vertically scrolling.
Help would be highly appreciated (:
回答1:
RecyclerView implements NestedScrollingChild2 inteface but does not implement any of NestedScrollingParent* interfaces, so it can be a scrollable child, but cannot be a parent for such a child.
To make it work you need to create a subclass of RecyclerView and implement NestedScrollingParent interface yourself. There are some articles also on how to do that, for instance this one.
来源：https://stackoverflow.com/questions/60311373/recyclerview-inside-a-recyclerview