滚动视图上方的线性布局

Question

I've got a simple android layout consisting of a scrollview containing a tablelayout. This table displays properly, but I would like to add a static header above the scrollview, so that basically the labels for the columns in the table remain at the top of the screen always. However, when I add a <LinearLayout> above the <ScrollView> in my layout file, it makes it all disappear.

Can anyone spot what I've done wrong with my xml file?

<?xml version="1.0" encoding="utf-8"?>

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/linearLayout1"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:gravity="top" >

        <LinearLayout 
            android:id="@+id/header"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content" 
            />

        <ScrollView
            android:id="@+id/scrollView1"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent" >

            <TableLayout 
                android:id="@+id/mainTable"
                android:layout_width="fill_parent"
                android:layout_height="fill_parent" />
        </ScrollView>

    </LinearLayout>

As it is, I do not see the scrollview or table layout, but if I remove the header linearlayout, it displays just fine.

Answer 1

LinearLayouts需要设置android:orientation参数。

Answer 2

You have to set the orientation of the parent LinearLayout to vertical! By default is set to horizontal that's way you don't see the ScrollView.

and you can try this:

<LinearLayout 
        android:id="@+id/header"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" 
        android:layout_weight="0"
        />

    <ScrollView
        android:id="@+id/scrollView1"
        android:layout_width="fill_parent"
        android:layout_height="0dp" android:layout_weight="1">

        <TableLayout 
            android:id="@+id/mainTable"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent" />
    </ScrollView>

Hope this helps!!

Answer 3

Your scrollview's layout_height is set to fill_parent. Use wrap_content.