android - 将 RecyclerView Adapter 添加到 ViewPager2 时 Android 应用程序崩溃
问题描述
我正在尝试使用像这样的上一个和下一个项目创建一个 ViewPager ，
每次我设置 的适配器时ViewPager，我的应用程序都会崩溃。
主要活动
class MainActivity : AppCompatActivity() {
private lateinit var binding: ActivityMainBinding
private val list = generateDummyList(10)
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ActivityMainBinding.inflate(layoutInflater)
setContentView(binding.root)
val vp = binding.viewPager2
vp.clipToPadding = false
vp.clipChildren = false
vp.offscreenPageLimit = 3
vp.adapter=TransformerAdapter(list)
val transformer: CompositePageTransformer = CompositePageTransformer()
transformer.addTransformer { page, position ->
val a = 1 - abs(position)
page.scaleY = 0.85f + a * 0.15f
}
}
private fun generateDummyList(size: Int): ArrayList<BigCard> {
val list = ArrayList<BigCard>()
for (i in 0 until size) {
val drawable = when (i % 3) {
0 -> R.drawable.luffy
1 -> R.drawable.luffy
else -> R.drawable.luffy
}
val item = BigCard( drawable )
list += item
}
return list
}
}
RecyclerView 适配器
class TransformerAdapter(private val list: List<BigCard>) :
RecyclerView.Adapter<TransformerAdapter.MyViewHolder>() {
class MyViewHolder(val binding: BigCardItemBinding) : RecyclerView.ViewHolder(binding.root) {
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder {
return MyViewHolder(
BigCardItemBinding.inflate(
LayoutInflater.from(parent.context),
parent,
false
)
)
}
override fun onBindViewHolder(holder: MyViewHolder, position: Int) {
val card = list[position]
holder.binding.picture.setImageResource(card.picture)
}
override fun getItemCount() = list.size
}
XML 项目“big_card_item”
<androidx.cardview.widget.CardView 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:layout_margin="16dp"
app:cardCornerRadius="8dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/advertisingText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginHorizontal="16dp"
android:layout_marginTop="16dp"
android:text="Some Advertising Talk\nAnd Another Advertising" />
<LinearLayout
android:id="@+id/info"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/advertisingText"
android:layout_marginHorizontal="16dp"
android:layout_marginTop="16dp"
android:orientation="vertical">
<TextView
android:id="@+id/doctorName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Doctors Name" />
<RatingBar
android:id="@+id/docRating"
style="?android:attr/ratingBarStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginVertical="2dp"
android:isIndicator="false"
android:numStars="5"
android:progressTint="@color/mid_blue"
android:rating="4.8"
android:scaleX="1"
android:scaleY="1"
android:stepSize="0.5" />
</LinearLayout>
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/info"
android:layout_marginHorizontal="16dp"
android:layout_marginVertical="8dp"
android:text="Check Out" />
<ImageView
android:id="@+id/picture"
android:layout_width="150dp"
android:layout_height="171dp"
android:layout_alignParentEnd="true"
android:scaleType="centerCrop"
android:src="@drawable/luffy" />
</RelativeLayout>
</androidx.cardview.widget.CardView>
卡“BigCard”的数据类
data class BigCard(val picture: Int)
logcat 中的红色线条
2021-03-06 18:18:46.503 13997-13997/com.example.testrecyclerview E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.testrecyclerview, PID: 13997
java.lang.IllegalStateException: Pages must fill the whole ViewPager2 (use match_parent)
at androidx.viewpager2.widget.ViewPager2$4.onChildViewAttachedToWindow(ViewPager2.java:270)
at androidx.recyclerview.widget.RecyclerView.dispatchChildAttached(RecyclerView.java:7561)
at androidx.recyclerview.widget.RecyclerView$5.addView(RecyclerView.java:860)
at androidx.recyclerview.widget.ChildHelper.addView(ChildHelper.java:107)
at androidx.recyclerview.widget.RecyclerView$LayoutManager.addViewInt(RecyclerView.java:8601)
at androidx.recyclerview.widget.RecyclerView$LayoutManager.addView(RecyclerView.java:8559)
at androidx.recyclerview.widget.RecyclerView$LayoutManager.addView(RecyclerView.java:8547)
at androidx.recyclerview.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1641)
at androidx.recyclerview.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1587)
at androidx.recyclerview.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:665)
at androidx.recyclerview.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:4134)
at androidx.recyclerview.widget.RecyclerView.dispatchLayout(RecyclerView.java:3851)
at androidx.recyclerview.widget.RecyclerView.onLayout(RecyclerView.java:4404)
at android.view.View.layout(View.java:20846)
at android.view.ViewGroup.layout(ViewGroup.java:6266)
at androidx.viewpager2.widget.ViewPager2.onLayout(ViewPager2.java:527)
at android.view.View.layout(View.java:20846)
at android.view.ViewGroup.layout(ViewGroup.java:6266)
at androidx.constraintlayout.widget.ConstraintLayout.onLayout(ConstraintLayout.java:1855)
at android.view.View.layout(View.java:20846)
at android.view.ViewGroup.layout(ViewGroup.java:6266)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:20846)
at android.view.ViewGroup.layout(ViewGroup.java:6266)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1812)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1656)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1565)
at android.view.View.layout(View.java:20846)
at android.view.ViewGroup.layout(ViewGroup.java:6266)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:20846)
at android.view.ViewGroup.layout(ViewGroup.java:6266)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1812)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1656)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1565)
at android.view.View.layout(View.java:20846)
at android.view.ViewGroup.layout(ViewGroup.java:6266)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at com.android.internal.policy.DecorView.onLayout(DecorView.java:754)
at android.view.View.layout(View.java:20846)
at android.view.ViewGroup.layout(ViewGroup.java:6266)
at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2910)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2425)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1521)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7437)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:965)
at android.view.Choreographer.doCallbacks(Choreographer.java:777)
at android.view.Choreographer.doFrame(Choreographer.java:709)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:951)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6702)
at java.lang.reflect.Method.invoke(Native Method)
2021-03-06 18:18:46.503 13997-13997/com.example.testrecyclerview E/AndroidRuntime: at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:911)
解决方案
申请height:match_parent_RecyclerView
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