Question

我在运行时遇到以下错误。

E / AndroidRuntime：致命异常：主要处理：com.example.usamaakmal.trackpoint，PID：8774 android.view.InflateException：二进制XML文件行＃0：android.support.design.widget.TabItem无法强制转换为android.view.ViewGroup 引起：java.lang.ClassCastException：android.support.design.widget.TabItem无法强制转换为 android.view.ViewGroup 在android.view.LayoutInflater.rInflate（LayoutInflater.java:870）在android.view.LayoutInflater.rInflateChildren（LayoutInflater.java:832）在android.view.LayoutInflater.rInflate（LayoutInflater.java:872）在android.view.LayoutInflater.rInflateChildren（LayoutInflater.java:832）在android.view.LayoutInflater.rInflate（LayoutInflater.java:872）在android.view.LayoutInflater.rInflateChildren（LayoutInflater.java:832）在android.view.LayoutInflater.inflate（LayoutInflater.java:518）在android.view.LayoutInflater.inflate（LayoutInflater.java:426）在com.example.usamaakmal.trackpoint.PresentationLayer.Dialogs.DateTimePickerDialog.onCreateView（DateTimePickerDialog.java:20）在android.support.v4.app.Fragment.performCreateView（Fragment.java:2354）在android.support.v4.app.FragmentManagerImpl.moveToState（FragmentManager.java:1419）在android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState（FragmentManager.java:1740）在android.support.v4.app.FragmentManagerImpl.moveToState（FragmentManager.java:1809）在android.support.v4.app.BackStackRecord.executeOps（BackStackRecord.java:799）在android.support.v4.app.FragmentManagerImpl.executeOps（FragmentManager.java:2580）在android.support.v4.app.FragmentManagerImpl.executeOpsTogether（FragmentManager.java:2367）在android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute（FragmentManager.java:2322）在android.support.v4.app.FragmentManagerImpl.execPendingActions（FragmentManager.java:2229）在android.support.v4.app.FragmentManagerImpl $ 1.run（FragmentManager.java:700）在android.os.Handler.handleCallback（Handler.java:761）在android.os.Handler.dispatchMessage（Handler.java:98）在android.os.Looper.loop（Looper.java:156）在android.app.ActivityThread.main（ActivityThread.java:6523） at java.lang.reflect.Method.invoke（Native Method）在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:942）在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Dialog片段类在

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，您无法在TabItem内添加其他视图。

<?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>

android.support.design.widget.TabItem无法强制转换为android.view.ViewGroup

1 个答案: