included Layout 的 rootview 出现 NullPointerException

Question

当我访问 included Layout 中的 RelativeLayout viewgroup 时获得一个 NullPointerexception 异常。在下面的代码中名称是 rootlayout。
date_layout.xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

        android:id="@+id/my_layoutroot_id"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="#eeeeee"
        android:paddingBottom="@dimen/activity_vertical_margin"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
        android:paddingTop="@dimen/activity_vertical_margin">

            <TextView
                android:id="@+id/date_from1_id"
                style="@style/date_text"
                android:layout_alignParentTop="true"
                android:text="@string/date_from1" />

            <TextView
                android:id="@+id/date_from2_id"
                style="@style/date_text"
                android:layout_alignBaseline="@+id/date_from1_id"
                android:layout_alignBottom="@+id/date_from1_id"
                android:layout_alignParentRight="true"
                android:text="@string/date_To1" />
               <TextView
    </RelativeLayout>

main_layout.xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <include layout="@layout/date_layout" android:id="@+id/datelayout_id"></include>"

<FrameLayout
    android:id="@+id/frame_id"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
</FrameLayout>
</LinearLayout> 

我的代码是：

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_layout);

        View view = findViewById(R.id.datelayout_id);
          rootlayout = (RelativeLayout)view.findViewById(R.id.my_layoutroot_id);
          rootlayout.setOnclickListener(this);  

哪里出错呢？

Answer 1

这个问题之前谁问过啊，一模一样的
把include里的
android:id="@+id/datelayout_id"
去掉看看,你命名id命名了两次，include里定义了，无需再在你的include的layout里定义id