美好的一天,我在尝试访问包含布局的 RelativeLayout 视图组时收到 NullPointerexception。在下面的代码中,它被命名为 rootlayout。我有这个
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>
在 main_layout.xml 中:
<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); // am getting the NullPointerException here
知道我做错了什么吗?非常感谢!