Question

我的导航抽屉中的片段包含两个RelativeLayouts，它们可以作为导航到两个不同活动的按钮。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>

在我应该从existingClientChoiceLayout导航到的Activity的布局中，我有这个：

<?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>

（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，一切都很好。当我从导航菜单中单击此片段的选项时，我收到WEIRD错误消息：

java.lang.ClassCastException：android.support.v7.widget.AppCompatTextView无法强制转换为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，如果删除FAB，一切正常。

我搜索了类似标题的相关问题，但没有一个与我的具体问题相符。

Answer 1

面对类似的问题，这就是我修复的方法：

清理项目（从“构建”菜单中）
重建项目（来自“构建”菜单）

使用浮动操作按钮

1 个答案: