Java 使用浮动操作按钮时出现致命异常

Java 使用浮动操作按钮时出现致命异常,java,android,android-layout,android-fragments,floating-action-button,Java,Android,Android Layout,Android Fragments,Floating Action Button,“我的导航抽屉”中的一个片段包含两个RelativeLayout,它们应该充当按钮来导航到两个不同的活动。 这是该布局的代码: <?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" and

“我的导航抽屉”中的一个片段包含两个RelativeLayout,它们应该充当按钮来导航到两个不同的活动。 这是该布局的代码:

<?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>
(相关)片段代码如下所示:

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;
}
现在,当我运行代码时,一切看起来都很好。当我从导航菜单中单击此片段的选项时,我会收到奇怪的错误消息:

java.lang.ClassCastException:android.support.v7.widget.AppCompatTextView无法强制转换为android.widget.RelativeLayout

但是,如果我删除了晶圆厂,一切都正常


我搜索过类似标题的相关问题,但没有一个与我的具体问题相匹配。

遇到类似问题,我就是这样解决的:

  • 清理项目(从“构建”菜单)
  • 重建项目(从“构建”菜单)

  • 如果你不需要晶圆厂按钮,删除它,但如果你需要它,声明它。然后检查fab是否不为空,如果不为空,请单击“添加侦听器”。请用文件名为每个示例代码部分命名。例如,在何处使用FAB XML并不明显。重新清理项目并重新生成此代码不会导致此错误。清理和重建,或者确保您发布了正确的错误跟踪。谢谢各位,清理和重建是我所要做的一切。问题解决了
    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;
    }
    
    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.