java - android.support.design.widget.TabItem 无法转换为 android.view.ViewGroup

Question

我在运行时遇到以下错误。

E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.usamaakmal.trackpoint, PID: 8774 android.view.InflateException: Binary XML file line #0: android.support.design.widget.TabItem cannot be cast to android.view.ViewGroup Caused by: java.lang.ClassCastException: android.support.design.widget.TabItem cannot be cast to android.view.ViewGroup at android.view.LayoutInflater.rInflate(LayoutInflater.java:870) at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:832) at android.view.LayoutInflater.rInflate(LayoutInflater.java:872) at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:832) at android.view.LayoutInflater.rInflate(LayoutInflater.java:872) at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:832) at android.view.LayoutInflater.inflate(LayoutInflater.java:518) at android.view.LayoutInflater.inflate(LayoutInflater.java:426) at com.example.usamaakmal.trackpoint.PresentationLayer.Dialogs.DateTimePickerDialog.onCreateView(DateTimePickerDialog.java:20) at android.support.v4.app.Fragment.performCreateView(Fragment.java:2354) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1419) at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1740) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1809) at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:799) at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2580) at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2367) at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2322) at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2229) at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:700) at android.os.Handler.handleCallback(Handler.java:761) at android.os.Handler.dispatchMessage(Handler.java:98) at android.os.Looper.loop(Looper.java:156) at android.app.ActivityThread.main(ActivityThread.java:6523) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:942) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:832)

我的 XML 布局如下

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

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:text="Select Date And Time"
        android:textSize="20dp"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="10dp"
        android:id="@+id/tv_date_time_title"/>


    <android.support.design.widget.TabLayout
        android:id="@+id/date_time_tab_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/tv_date_time_title"
        android:layout_centerVertical="true">

        <android.support.design.widget.TabItem
            android:id="@+id/tab_date_item"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Date">

            <DatePicker android:id="@+id/dp_date_picker"></DatePicker>

        </android.support.design.widget.TabItem>

        <android.support.design.widget.TabItem
            android:id="@+id/tab_time_item"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Time">

            <TimePicker android:id="@+id/tp_time_picker"></TimePicker>
        </android.support.design.widget.TabItem>
    </android.support.design.widget.TabLayout>
</RelativeLayout>

我的自定义对话框 fragment 类在下面

public class DateTimePickerDialog extends DialogFragment {
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.date_time_picker_layout,container,false);
        return view;
    }
}

Answer 1

TabItem 扩展View。 Reference here .因此，您不能在 TabItem 中包含另一个 View 。

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

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:text="Select Date And Time"
        android:textSize="20dp"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="10dp"
        android:id="@+id/tv_date_time_title"/>


    <android.support.design.widget.TabLayout
        android:id="@+id/date_time_tab_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/tv_date_time_title"
        android:layout_centerVertical="true">

        <android.support.design.widget.TabItem
            android:id="@+id/tab_date_item"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Date" />

        <android.support.design.widget.TabItem
            android:id="@+id/tab_time_item"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Time" />
    </android.support.design.widget.TabLayout>
</RelativeLayout>