Android 回收器视图无法获取显示内容
我在实现Recyclerview时遇到问题。以下是我的错误详细信息Android 回收器视图无法获取显示内容,android,kotlin,Android,Kotlin,我在实现Recyclerview时遇到问题。以下是我的错误详细信息 E/AndroidRuntime: FATAL EXCEPTION: main Process: com.internshala.test1, PID: 5181 java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.widget.Re
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.internshala.test1, PID: 5181
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.widget.RecyclerView$LayoutManager.onMeasure(android.support.v7.widget.RecyclerView$Recycler, android.support.v7.widget.RecyclerView$State, int, int)' on a null object reference
at android.support.v7.widget.RecyclerView.onMeasure(RecyclerView.java:1694)
at android.view.View.measure(View.java:22097)
at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:715)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)
at android.view.View.measure(View.java:22097)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6606)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1514)
at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:1167)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:687)
at android.view.View.measure(View.java:22097)
at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:715)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)
at android.view.View.measure(View.java:22097)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6606)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
at android.view.View.measure(View.java:22097)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6606)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1514)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:806)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:685)
at android.view.View.measure(View.java:22097)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6606)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
at com.android.internal.policy.DecorView.onMeasure(DecorView.java:727)
at android.view.View.measure(View.java:22097)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2448)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1530)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1787)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1418)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6800)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:968)
at android.view.Choreographer.doCallbacks(Choreographer.java:780)
at android.view.Choreographer.doFrame(Choreographer.java:715)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:954)
at android.os.Handler.handleCallback(Handler.java:790)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6620)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:518)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:822)
I/进程:发送信号。PID:5181信号:9
申请终止
下面是用于调用适配器类的代码
if (araayList == null || (araayList.isEmpty() as Boolean)) {
Toast.makeText(this, "its empty", Toast.LENGTH_SHORT).show()
} else {
this.displayingPostAdapters = DisplayingPostAdapters(araayList, this)
recylerView = findViewById<RecyclerView>(R.id.recyclerView)
mlayoutManager == LinearLayoutManager(this)
(mlayoutManager as LinearLayoutManager).orientation = LinearLayoutManager.VERTICAL
recylerView?.layoutManager = mlayoutManager
recylerView?.itemAnimator = DefaultItemAnimator()
recylerView?.adapter = displayingPostAdapters
recylerView?.setHasFixedSize(true)
this.displayingPostAdapters!!.notifyDataSetChanged()
}
}
if(araylist==null | |(araylist.isEmpty()作为布尔值)){
Toast.makeText(这个“它是空的”,Toast.LENGTH\u SHORT.show()
}否则{
this.displayingPostAdapters=displayingPostAdapters(araylist,this)
recylerView=findViewById(R.id.recyclerView)
mlayoutManager==线性布局管理器(此)
(mlayoutManager作为LinearLayoutManager)。方向=LinearLayoutManager.VERTICAL
recylerView?.layoutManager=MLLAYOUTManager
recylerView?.itemAnimator=DefaultItemAnimator()
recylerView?适配器=显示后适配器
recylerView?.setHasFixedSize(真)
这个.displayingPostAdapters!!.notifyDataSetChanged()
}
}
请尝试提供克服此错误的建议谢谢。显示PostAdapters和显示PostAdapters是否不同 尝试如下
recylerView?.adapter = this.displayingPostAdapters
未解析的应用程序仍以相同错误终止