Layout Weights do not work inside a ScrollView

Question

I want to assign layout weights to several items within a LinearLayout inside of a ScrollView. However, the ScrollView ignores the LinearLayout weightSum.

My goal is to divide the layout with weights of 2, 1, 1 (for a total sum of 4), but this does not work properly inside of a ScrollView.

How can I solve this layout problem?

main.xml

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"     android:id="@+id/scrollView1"     android:layout_width="fill_parent"     android:layout_height="fill_parent">      <LinearLayout          android:layout_width="fill_parent"         android:layout_height="fill_parent"         android:orientation="vertical"          android:weightSum="4">          <LinearLayout android:id="@+id/logo"             android:layout_width="fill_parent"             android:layout_height="wrap_content"             android:orientation="vertical"              android:layout_weight="2"             android:background="#FFFFFF" />          <LinearLayout android:id="@+id/logo1"             android:layout_width="fill_parent"             android:layout_height="wrap_content"             android:orientation="vertical"              android:layout_weight="1"             android:background="#000000" />           <LinearLayout android:id="@+id/logobutton"             android:layout_width="fill_parent"             android:layout_height="wrap_content"             android:orientation="horizontal"              android:layout_weight="1"              android:background="#4B4B4B" />      </LinearLayout> </ScrollView> 

Answer 1

I have faced this problem before. Just use android:fillViewport="true" in your ScrollView and it will fill up the screen.

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"     android:id="@+id/scrollView1"     android:layout_width="fill_parent"     android:layout_height="fill_parent"     android:fillViewport="true" > 

Answer 2

This won't work as you have done it. The child view of a ScrollView should be set to wrap_content. If you set it to fill_parent, it will fill the area of the ScrollView and never scroll, because it won't be larger than the ScrollView.

The idea of layout_weight is to fill a specific area proportionately.

You should set all of the child LinearLayouts layout_height to either wrap_content or a specific size (in dp) and the parent LinearLayout layout_height to wrap_content

As said you need to remove the additional

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

if it's not the root (first) element of the layout.