使用浮动操作按钮时发生致命异常

Question

来自我的导航抽屉的片段包含两个RelativeLayouts，这两个RelativeLayouts应该充当按钮以导航到两个不同的活动。 这对于布局的代码：

<?xml version="1.0" encoding="utf-8"?> 
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    android:background="#B3E5FC" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 


<RelativeLayout 
    android:id="@+id/existingClientChoiceLayout" 
    android:layout_width="match_parent" 
    android:layout_height="300dp" 
    android:layout_alignParentTop="true" 
    android:background="@color/colorAccent"> 

    <TextView 
     android:id="@+id/textView2" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignParentTop="true" 
     android:layout_centerHorizontal="true" 
     android:layout_marginTop="126dp" 
     android:text="Existing Client" 
     android:textColor="@android:color/white" 
     android:textSize="20sp" 
     android:textStyle="bold" /> 
</RelativeLayout> 

<RelativeLayout 
    android:layout_width="match_parent" 
    android:id="@+id/newClientChoiceLayout" 
    android:layout_height="300dp" 
    android:layout_alignParentBottom="true" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentStart="true" 
    android:background="@color/light_red"> 

    <TextView 
     android:id="@+id/textView7" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_centerHorizontal="true" 
     android:layout_marginTop="138dp" 
     android:text="New Client" 
     android:textColor="@android:color/white" 
     android:textSize="20sp" 
     android:textStyle="bold" /> 

    </RelativeLayout> 
</RelativeLayout> 

在活动的布局我应该导航到existingClientChoiceLayout，我有这样的：

<?xml version="1.0" encoding="utf-8"?> 
    <RelativeLayout 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/activity_new_client" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    tools:context="judeochalifu.teylur.activities.NewClientActivity"> 


<android.support.design.widget.FloatingActionButton 
    android:id="@+id/fab" 
    android:layout_width="wrap_content" 
    android:layout_height="match_parent" 
    android:layout_margin="14dp" 
    android:layout_alignParentBottom="true" 
    android:layout_alignParentRight="true" 
    android:src="@drawable/ic_menu_send" 
    app:fabSize="normal" /> 

</RelativeLayout> 

的（相关）片段的代码如下所示：现在

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 

    View rootView = inflater.inflate(R.layout.new_entry_layout, container, false); 
    existingClientChoiceLayout = (RelativeLayout) rootView.findViewById(R.id.existingClientChoiceLayout); 
    newClientChoiceLayout = (RelativeLayout) rootView.findViewById(R.id.newClientChoiceLayout); 

    existingClientChoiceLayout.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      startActivity(new Intent(mContext, ExistingClientsViewActivity.class)); 
      Toast.makeText(mContext, "Clicked", Toast.LENGTH_SHORT).show(); 
     } 
    }); 

    newClientChoiceLayout.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      startActivity(new Intent(mContext, NewClientActivity.class)); 
     } 
    }); 

    return rootView; 
} 

，当我运行的代码一切看起来fine.When我的选项单击从导航菜单这个片段，我得到的WEIRD ERR或消息：

java.lang.ClassCastException：android.support.v7.widget.AppCompatTextView不能转换到android.widget.RelativeLayout

E/AndroidRuntime: FATAL EXCEPTION: main 
       Process: judeochalifu.teylur, PID: 4746 
       java.lang.ClassCastException: android.support.v7.widget.AppCompatTextView cannot be cast to android.widget.RelativeLayout 
        at judeochalifu.teylur.fragments.NewEntryFragment.onCreateView(NewEntryFragment.java:47) 
        at android.support.v4.app.Fragment.performCreateView(Fragment.java:2080) 
        at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1108) 
        at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1290) 
        at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:801) 
        at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1677) 
        at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:536) 
        at android.os.Handler.handleCallback(Handler.java:751) 
        at android.os.Handler.dispatchMessage(Handler.java:95) 
        at android.os.Looper.loop(Looper.java:154) 
        at android.app.ActivityThread.main(ActivityThread.java:6077) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755) 
Application terminated. 

但是，如果我删除FAB，一切正常。

我已经搜索了相似的题目，但没有匹配我的具体问题。

Answer 1

面临着类似的问题，这是我的固定：

1. 清理项目（从生成菜单）
2. 重建项目（从生成菜单）