RelativeLayout.LayoutParams在android中导致应用程序崩溃

问题描述：

我有一个回收器视图，其中我有一个线性布局作为父项和一个相对布局作为子项。我正在动态改变布局参数。我的代码在线性布局方面效果很好，但是当涉及到相对布局时，它会崩溃。RelativeLayout.LayoutParams在android中导致应用程序崩溃

它甚至没有显示导致崩溃的行号，经过如此多的运行后，我发现导致崩溃的那一行。这是回收视图适配器类。

@Override 
    public void onBindViewHolder(Holder holder, int position) { 
     ChatListItem listItem = listdata.get(position); 
     LinearLayout parent=holder.parent; 
     RelativeLayout chatView=holder.relLayout; 
     holder.time.setText(listItem.time); 
     holder.message.setText(listItem.message); 
     if (!listItem.sentByCustomer) { 
      int match_parent= LinearLayout.LayoutParams.MATCH_PARENT; 
      int wrap_content= LinearLayout.LayoutParams.WRAP_CONTENT; 
      chatView.setBackground(context.getResources().getDrawable(R.drawable.incoming_normal)); 

      LinearLayout.LayoutParams parentParams=new LinearLayout.LayoutParams(match_parent,wrap_content); 
      parentParams.setMarginStart(5); 
      parent.setLayoutParams(parentParams); 

      int rel_wrap_content=RelativeLayout.LayoutParams.WRAP_CONTENT; 
      RelativeLayout.LayoutParams relParams=new RelativeLayout.LayoutParams(rel_wrap_content,rel_wrap_content); 
      relParams.setMarginEnd(50); 




      chatView.setLayoutParams(relParams); // This line is causing crash 



     } 
    } 



    class Holder extends RecyclerView.ViewHolder { 
     LinearLayout parent; 
     RelativeLayout relLayout; 
     TextView message, time; 

     public Holder(View itemView) { 
      super(itemView); 
      parent=(LinearLayout)itemView.findViewById(R.id.chat_view_parent); 
      relLayout = (RelativeLayout) itemView.findViewById(R.id.customer_chat_view); 
      message = (TextView) itemView.findViewById(R.id.customer_chat_message); 
      time = (TextView) itemView.findViewById(R.id.chat_time); 
     } 
    } 
}

一切都好布局PARAMS属于相对布局PARAMS，我将它们设置为相对的布局，我也钩稽XML文件和一个也是相对布局。仍然错误日志是说它不能将线性布局参数转换为相对布局参数。即使调试器也在说它是相对布局，但为什么我会得到错误？以下是错误日志

07-04 15:09:13.609 5441-5441/com.motowala E/UncaughtException: java.lang.ClassCastException: android.widget.RelativeLayout$LayoutParams cannot be cast to android.widget.LinearLayout$LayoutParams 
                    at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:1071) 
                    at android.widget.LinearLayout.onMeasure(LinearLayout.java:642) 
                    at android.view.View.measure(View.java:19861) 
                    at android.support.v7.widget.RecyclerView$LayoutManager.measureChildWithMargins(RecyclerView.java:8636) 
                    at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1577) 
                    at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1511) 
                    at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:570) 
                    at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3583) 
                    at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:3312) 
                    at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3844) 
                    at android.view.View.layout(View.java:17641) 
                    at android.view.ViewGroup.layout(ViewGroup.java:5575) 
                    at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1079) 
                    at android.view.View.layout(View.java:17641) 
                    at android.view.ViewGroup.layout(ViewGroup.java:5575) 
                    at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323) 
                    at android.widget.FrameLayout.onLayout(FrameLayout.java:261) 
                    at android.view.View.layout(View.java:17641) 
                    at android.view.ViewGroup.layout(ViewGroup.java:5575) 
                    at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741) 
                    at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585) 
                    at android.widget.LinearLayout.onLayout(LinearLayout.java:1494) 
                    at android.view.View.layout(View.java:17641) 
                    at android.view.ViewGroup.layout(ViewGroup.java:5575) 
                    at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323) 
                    at android.widget.FrameLayout.onLayout(FrameLayout.java:261) 
                    at android.view.View.layout(View.java:17641) 
                    at android.view.ViewGroup.layout(ViewGroup.java:5575) 
                    at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741) 
                    at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585) 
                    at android.widget.LinearLayout.onLayout(LinearLayout.java:1494) 
                    at android.view.View.layout(View.java:17641) 
                    at android.view.ViewGroup.layout(ViewGroup.java:5575) 
                    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:728) 
                    at android.view.View.layout(View.java:17641) 
                    at android.view.ViewGroup.layout(ViewGroup.java:5575) 
                    at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2346) 
                    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2068) 
                    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1254) 
                    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6343) 
                    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:874) 
                    at android.view.Choreographer.doCallbacks(Choreographer.java:686) 
                    at android.view.Choreographer.doFrame(Choreographer.java:621) 
                    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:860) 
                    at android.os.Handler.handleCallback(Handler.java:751) 
                    at android.os.Handler.dispatchMessage(Handler.java:95) 
                    at android.os.Looper.loop(Looper.java:154) 
                    at android.app.ActivityThread.main(ActivityThread.java:6176) 
                    at java.lang.reflect.Method.invoke(Native Method) 
                    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:888) 
                    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:778) 
07-04 15:09:13.613 5441-5502/com.motowala D/FA: Logging event (FE): _ae, Bundle[{_o=crash, _sc=CustomerChatActivity, _si=6120152536016377641, timestamp=1499161153609, fatal=1}] 
07-04 15:09:13.906 5441-5441/com.motowala E/AndroidRuntime: FATAL EXCEPTION: main 
                  Process: com.motowala, PID: 5441 
                  java.lang.ClassCastException: android.widget.RelativeLayout$LayoutParams cannot be cast to android.widget.LinearLayout$LayoutParams 
                   at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:1071) 
                   at android.widget.LinearLayout.onMeasure(LinearLayout.java:642) 
                   at android.view.View.measure(View.java:19861) 
                   at android.support.v7.widget.RecyclerView$LayoutManager.measureChildWithMargins(RecyclerView.java:8636) 
                   at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1577) 
                   at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1511) 
                   at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:570) 
                   at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3583) 
                   at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:3312) 
                   at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3844) 
                   at android.view.View.layout(View.java:17641) 
                   at android.view.ViewGroup.layout(ViewGroup.java:5575) 
                   at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1079) 
                   at android.view.View.layout(View.java:17641) 
                   at android.view.ViewGroup.layout(ViewGroup.java:5575) 
                   at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323) 
                   at android.widget.FrameLayout.onLayout(FrameLayout.java:261) 
                   at android.view.View.layout(View.java:17641) 
                   at android.view.ViewGroup.layout(ViewGroup.java:5575) 
                   at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741) 
                   at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585) 
                   at android.widget.LinearLayout.onLayout(LinearLayout.java:1494) 
                   at android.view.View.layout(View.java:17641) 
                   at android.view.ViewGroup.layout(ViewGroup.java:5575) 
                   at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323) 
                   at android.widget.FrameLayout.onLayout(FrameLayout.java:261) 
                   at android.view.View.layout(View.java:17641) 
                   at android.view.ViewGroup.layout(ViewGroup.java:5575) 
                   at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741) 
                   at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585) 
                   at android.widget.LinearLayout.onLayout(LinearLayout.java:1494) 
                   at android.view.View.layout(View.java:17641) 
                   at android.view.ViewGroup.layout(ViewGroup.java:5575) 
                   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:728) 
                   at android.view.View.layout(View.java:17641) 
                   at android.view.ViewGroup.layout(ViewGroup.java:5575) 
                   at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2346) 
                   at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2068) 
                   at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1254) 
                   at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6343) 
                   at android.view.Choreographer$CallbackRecord.run(Choreographer.java:874) 
                   at android.view.Choreographer.doCallbacks(Choreographer.java:686) 
                   at android.view.Choreographer.doFrame(Choreographer.java:621) 
                   at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:860) 
                   at android.os.Handler.handleCallback(Handler.java:751) 
                   at android.os.Handler.dispatchMessage(Handler.java:95) 
                   at android.os.Looper.loop(Looper.java:154) 
                   at android.app.ActivityThread.main(ActivityThread.java:6176) 
                   at java.lang.reflect.Method.invoke(Native Method) 
                   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:888) 
                   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:778)

非常感谢提前....

可我知道为什么我的问题是downvoted的原因 – bharath

relLayout =（RelativeLayout的）itemView.findViewById（R.id.customer_chat_view）的原因; 检查是否该ID对应的TOA的RelativeLayout – Vicky

是对应于相对布局 bharath

答

java.lang.ClassCastException: android.widget.RelativeLayout$LayoutParams cannot be cast to android.widget.LinearLayout$LayoutParams

你引用的线性布局，但使用相对布局，显示XML文件你正在使用或检查线性布局

不，我在XML使用相对布局 bharath

相对布局在线性布局内 – bharath

答

上面清清楚楚地写着

android.widget。 RelativeLayout $ LayoutParams不能转换为 android.widget。 的LinearLayout $的LayoutParams

您试图投LinearLayout.LayoutParams到RelativeLayout.LayoutParams。就像试图将苹果转换成橙色一样。

更改此：

int match_parent= LinearLayout.LayoutParams.MATCH_PARENT; 
int wrap_content= LinearLayout.LayoutParams.WRAP_CONTENT; 
chatView.setBackground(context.getResources().getDrawable(R.drawable.incoming_normal)); 

LinearLayout.LayoutParams parentParams=new LinearLayout.LayoutParams(match_parent,wrap_content); 
parentParams.setMarginStart(5); 
parent.setLayoutParams(parentParams);

到这一点，并尝试运行。

int match_parent= RelativeLayout.LayoutParams.MATCH_PARENT; 
int wrap_content= RelativeLayout.LayoutParams.WRAP_CONTENT; 
chatView.setBackground(context.getResources().getDrawable(R.drawable.incoming_normal)); 

RelativeLayout.LayoutParams parentParams=new RelativeLayout.LayoutParams(match_parent,wrap_content); 
parentParams.setMarginStart(5); 
parent.setLayoutParams(parentParams);

您在阅读问题时错过了一行。实际的东西是这个int rel_wrap_content = RelativeLayout.LayoutParams.WRAP_CONTENT; RelativeLayout.LayoutParams relParams = new RelativeLayout.LayoutParams（rel_wrap_content，rel_wrap_content）; relParams.setMarginEnd（50）; – bharath

我将rel_wrap_content设置为相对布局参数而不是wrap_content这是一个线性布局参数 – bharath

@bharath您应该给参数设置为您的父布局。如果你的父亲是RelativeLayout，你应该使用RelativeLayout Params。 –

答

我解决了我的问题，通过删除根线性布局并以root身份制作相对布局。而我依然毫无章法的，为什么错误发生:(

RelativeLayout.LayoutParams在android中导致应用程序崩溃

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