[英]Make recycler view to be scrollable vertically
I'm using the following code to create a recycler view.我正在使用以下代码来创建回收站视图。 The recyclerview has got a grid layout manager with an item count of up to 2 per row. recyclerview 有一个网格布局管理器,每行的项目数最多为 2。
<androidx.constraintlayout.widget.ConstraintLayout 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="match_parent"
android:background="@color/white"
android:clickable="true"
android:focusableInTouchMode="true"
android:focusable="true">
<ImageView
android:id="@+id/backPress"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_marginTop="20dp"
android:layout_marginEnd="16dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/hello"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="Title!"
android:textSize="30sp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"
/>
<TextView
android:id="@+id/textGoing"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Subtitle"
android:textSize="@dimen/text_average"
android:textStyle="bold"
app:layout_constraintTop_toBottomOf="@+id/hello" />
<com.google.android.material.textfield.TextInputLayout
android:layout_margin="@dimen/dimen_20"
app:layout_constraintTop_toBottomOf="@+id/textGoing"
android:id="@+id/anchor_input"
style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:boxBackgroundColor="@android:color/white"
android:background="@android:color/transparent" >
<EditText
android:id="@+id/anchor_edit_txt"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
</com.google.android.material.textfield.TextInputLayout>
<TextView
app:layout_constraintTop_toBottomOf="@+id/anchor_input"
app:layout_constraintStart_toStartOf="@+id/anchor_input"
android:id="@+id/anchor_hint"
android:layout_below="@+id/anchor_input"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
<Button
android:id="@+id/add_cat_btn"
app:layout_constraintTop_toBottomOf="@+id/anchor_hint"
app:layout_constraintEnd_toEndOf="parent"
android:layout_below="@+id/anchor_hint"
android:layout_marginTop="@dimen/dimen_20"
android:text="START"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"/>
<TextView
android:id="@+id/category_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintTop_toBottomOf="@+id/add_cat_btn"
android:text="Description"/>
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/category_rv"
app:layout_constraintTop_toBottomOf="@+id/category_title"
app:layout_constraintStart_toStartOf="parent"
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:layoutManager="androidx.recyclerview.widget.GridLayoutManager"
tools:itemCount="4"
android:layout_margin="@dimen/dimen_20"/>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="@+id/move_next"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:fabSize="normal"
app:tint="@android:color/white"
app:layout_constraintEnd_toEndOf="@+id/category_rv"
app:layout_constraintBottom_toBottomOf="parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>
Unfortunately, the recycler view that I have nested within the ConstraintLayout is not scrolling at all.不幸的是,我嵌套在 ConstraintLayout 中的回收器视图根本没有滚动。 What am I missing?我错过了什么? Does constraint layout support the same?约束布局是否支持相同的?
The error comes from错误来自
tools:layoutManager="androidx.recyclerview.widget.GridLayoutManager"
tools:itemCount="4"
replace it by将其替换为
app:layoutManager="androidx.recyclerview.widget.GridLayoutManager"
app:spanCount="4"
To solve RecyclerView scrolling issue with ConstraintLayout parent change your RecyclerView height from wrap_content to 0dp and add top and bottom constraints like below:要使用 ConstraintLayout 父级解决 RecyclerView 滚动问题,请将 RecyclerView 高度从 wrap_content 更改为 0dp 并添加顶部和底部约束,如下所示:
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/category_rv"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="@+id/category_title"
app:layout_constraintBottom_toBottomOf="parent"/>
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