即使我将xml中的宽度设置为match_parent,我也不知道为什么RecyclerView
的宽度大于父宽度。我认为xml没什么问题,但是我不确定适配器。这是适配器的代码:
class ListAdapter(val data : ArrayList<devices>): RecyclerView.Adapter<ListAdapter.ViewHolder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
return ViewHolder(
LayoutInflater.from(parent.context)
.inflate(R.layout.devicelist, parent, false)
)
}
override fun getItemCount() = data.size
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
val list = data[position]
holder.view.listimgtxt.text = list.name
holder.view.listsw1.text = list.sw1
holder.view.listsw2.text = list.sw2
holder.view.listsw3.text = list.sw3
holder.view.listsw4.text = list.sw4
}
class ViewHolder(val view: View) : RecyclerView.ViewHolder(view)
}
这是我的xml代码(由于代码太长而删除了imageviews和textviews):
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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="wrap_content">
</android.support.constraint.ConstraintLayout>
包含recyclerview的xml:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:showIn="@layout/app_bar_main"
tools:context=".MainActivity"
android:background="#FFFFFF"
>
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical"
android:id="@+id/recyclerview"
/>
</FrameLayout>
答案 0 :(得分:0)
尝试使用约束布局,并将“ Recycler”视图的宽度设置为0dp并将其约束在父对象的左侧和右侧...匹配父对象不遵守约束。
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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:id="@+id/content_frame"
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:background="#FFFFFF"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context=".MainActivity">
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerview"
android:layout_width="0dp"
android:layout_height="match_parent"
android:scrollbars="vertical"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
/>
</android.support.constraint.ConstraintLayout>
还要将列表项中所有图像的宽度设置为0dp,以便根据约束设置将其调整为屏幕尺寸。