Android: Dynamically add views to ScrollView

Question

I have a ScrollView and I want to insert a user specified number of HorizontalScrollViews. So what user says he wants to have a matrix of 5x5 elements, I want to insert 5 HorizontalScrollViews with 5 EditText objects each. My program adds the first line just as it's supposed to, but the rest not.

for (int i = 0; i < number; i++) {
        LinearLayout ll = new LinearLayout(this);
        ll.setLayoutParams(par2);
        HorizontalScrollView row = new HorizontalScrollView(this);
        row.setLayoutParams(par1);
        row.addView(ll);
        for (int j = 0; j < number; j++) {
            EditText txt = new EditText(this);
            txt.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
            txt.setHint(i+","+j);
            ll.addView(txt);
        }
        latout_in_scrollview.addView(row);
    }

Any ideas why? Thanks!

EDIT: The 1:1 code im using

LinearLayout dijkstra_rows;
FrameLayout.LayoutParams par1 = new FrameLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
LinearLayout.LayoutParams par2 = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);

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

    dijkstra_rows = (LinearLayout) findViewById(R.id.dijkstra_rows);

    Bundle extras = getIntent().getExtras();
    number = extras.getInt("vertexes");

    for (int i = 0; i < number; i++) {
        LinearLayout ll = new LinearLayout(this);
        ll.setLayoutParams(par2);
        HorizontalScrollView row = new HorizontalScrollView(this);
        row.setLayoutParams(par1);
        row.addView(ll);
        for (int j = 0; j < number; j++) {
            EditText txt = new EditText(this);
            txt.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
            txt.setHint(i+","+j);
            ll.addView(txt);
        }
        dijkstra_rows.addView(row);
    }
}

You will probably get exception.. Something says ScrollViw has only one direct child — Pragnani Kinnera
– Pragnani Kinnera, Commented Mar 31, 2013 at 18:09

Pratap · Accepted Answer · 2016-03-22 12:45:21Z

5

ScrollView can contain only one childView. You can put any layout as per your requirement. I generally use Relative Layout...

Then add views dynamically to relative layout

 viewLayout = (ViewGroup) mView.findViewById(R.id.YOUR_RELATIVE_LAYOUT_ID);
        View lastCard = viewLayout.getChildAt(viewLayout.getChildCount() - 1);

    // INFLATE YOUR NEW VIEW YOU WANT TO ADD
                CardView cardView = (CardView) 

LayoutInflater.from(getContext()).inflate(R.layout.card_nearest_stop, null);
            RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(
                    ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);

            //Set id to view
            int id = 125;
            if (lastCard != null) {
                params.addRule(RelativeLayout.BELOW, lastCard.getId());
                id = lastCard.getId() + 125;
            }
            cardView.setLayoutParams(params);
            cardView.setId(id);
            viewLayout.addView(cardView);

answered Mar 22, 2016 at 12:45

Pratap

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2 Comments

Farrukh Najmi Over a year ago

And if your RelativeLayout (or other layout) is already the single child of your ScrollView in your layout XML file then I discovered the hard way that you must do scrollView.removeAllViews() and

questionsContainer.setLayoutParams(new ViewGroup.LayoutParams(                 ViewGroup.LayoutParams.MATCH_PARENT,                 ViewGroup.LayoutParams.WRAP_CONTENT));         scrollView.addView(relativeLayout);

Otherwise the scrolling will not work.

Daniel Silva Over a year ago

@FarrukhNajmi You have the right answer for my problem, I did the same as Pratap, but with LinearLayout. Scrollview wouldn't work, your solution made it work, thank you!

Jeffrey Blattman · Accepted Answer · 2013-03-31 18:06:50Z

2

ScrollView is a single element container.

A ScrollView is a FrameLayout, meaning you should place one child in it containing the entire contents to scroll; this child may itself be a layout manager with a complex hierarchy of objects. A child that is often used is a LinearLayout in a vertical orientation, presenting a vertical array of top-level items that the user can scroll through.

answered Mar 31, 2013 at 18:06

Jeffrey Blattman

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2 Comments

Tomáš 'Guns Blazing' Frček Over a year ago

Yes, i know, I have a single LinearLayout verticaly oriented within the ScrollView. I described it incorrectly in the snipet, I fixted it.

Tomáš 'Guns Blazing' Frček Over a year ago

Well, it pretty much is the code Im using. But I added the exact copy

Akhil · Accepted Answer · 2015-06-29 20:03:24Z

0

You are adding multiple LinearLayouts here

 for (int i = 0; i < number; i++) {
        LinearLayout ll = new LinearLayout(this);
.
.
}

You should have only one out of this loop. Then add this one to your scrollView, in Loop you can add muliple HorizontolScrollViews to this LinearLayout

edited Jun 29, 2015 at 20:03

answered Jun 29, 2015 at 19:27

Akhil

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