android – ViewPager in ScrollView-ThrowExceptions

Exception or error:

I need to have a ViewPager inside a ScrollView but ViewPager just does not appear when it’s in ScrollView, everything is ok when i don’t use ScrollView.

I’ve seen a couple questions like this being asked here on stackoverflow or on other sites and all of them have been answered that you have to put android:fillViewport="true" to your scrollview to fix the problem, but this solution doesnt work for me, ViewPager still does not appear even if i have android:fillViewport="true" in my ScrollView.

I guess something got changed in the android api’s or something and this solution doesn’t work anymore, does anyone know how i could possibly make a ViewPager appear in a ScrollView?

UPDATE: A working ScrollView layout XML:

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


    <LinearLayout
        android:id="@+id/linearLayout1"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical">

            <android.support.v4.view.ViewPager
                android:id="@+id/itemsViewPager2"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content" >
            </android.support.v4.view.ViewPager>
    </LinearLayout>
 </ScrollView>
How to solve:

I ran into a similar problem in the past. A View-Pager must have a set height (it cannot wrap-content). Since a ViewPager loads separate pages, and not all at once, it won’t know what ‘wrap-content’ actually means. Setting the layout_height to fill_parent or a set dp allows the ViewPager to statically set it’s height and react more accordingly within other layouts.

###

public class YourScrollableViewPager extends ViewPager {

private static final int MATCH_PARENT = 1073742592;

private int currentPageNumber;
private int pageCount;

public YourScrollableViewPager(Context context) {
    super(context);
    prepareUI();
}

public YourScrollableViewPager(Context context, AttributeSet attrs) {
    super(context, attrs);
    prepareUI();
}

private void prepareUI() {
    setOffscreenPageLimit(pageCount);
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    int height = 0;
    if (getChildCount() != 0) {
        View child = getChildAt(currentPageNumber);
        child.measure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
        int h = child.getMeasuredHeight();
        if (h > height) height = h;
    }
    heightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY);
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}

public void onPrevPage() {
    onMeasure(MATCH_PARENT, 0);
}

public void onNextPage() {
    onMeasure(MATCH_PARENT, 0);
}}

###

I found solution for mine using "HorizontalScrollView" instead of ScrollView.

First create activity_main.xml with below code, where you define ViewPager.

        <?xml version="1.0" encoding="utf-8"?>
           <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
               android:layout_width="fill_parent"
               android:layout_height="fill_parent"
               android:orientation="vertical" >

            <android.support.v4.view.ViewPager
               android:id="@+id/pager"   
               android:layout_width="match_parent"
               android:layout_height="match_parent" />
           </LinearLayout>

And later create another left.xml for defining your HorizontalScrollView :

        <?xml version="1.0" encoding="utf-8"?>
        <HorizontalScrollView xmlns:android="http://schemas.android.com/apk/res
              /android"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:orientation="vertical" >

           <ImageView
              android:id="@+id/imageView1"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:src="@drawable/ic_launcher" />
        </HorizontalScrollView>

###

Just add the android:fillViewport=”true” to your scroll view it will work

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