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POdynamically add and remove view to viewpager
 

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    <p><strong>(I figured out a solution - please see my post in the Answer section below.)</strong></p> <p>In my app, the user will start with a single view of his data. I'd like to add a ViewPager and allow the user to add more views as desired. How do I do this? (I dont' want to use the FragmentPagerAdapter.)</p> <p>I've read countless posts and overviews but am still missing something. Here's what I think I understand:</p> <p>MainActivity creates a ViewPager and PagerAdapter:</p> <pre><code>ViewPager pager = null; MainPagerAdapter adapter = null; public void onCreate (Bundle savedInstanceState) { super.onCreate (savedInstanceState); pager = new ViewPager (this); setContentView (pager); adapter = new MainPagerAdapter(); pager.setAdapter (adapter); View v0 = code_to_create_initial_view(); adapter.add (v0, 0); } </code></pre> <p>Use a PagerAdapter to provide the sets of view. For this it seems I need methods to add and remove views, something like this; obviously more is needed to tell the ViewPager stuff has changed and how to show the change:</p> <pre><code>class MainPagerAdapter extends PagerAdapter { // This holds all the currently displayable views, in order from left to right. private ArrayList&lt;View&gt; views = new ArrayList&lt;View&gt;(); public void addView (View v, int position) { views.add (position, v); } public void removeView (int position) { views.remove (position); } } </code></pre> <p>In addition, I need to implement the following vitual methods. I'm lost here - what calls them and what are they supposed to do (ok, getCount is obvious)? </p> <pre><code> public object instantiateItem (ViewGroup pager, int position); public void destroyItem (ViewGroup, int, Object); public int getCount (); public boolean isViewFromObject (View, Object); </code></pre> <ul> <li>What are the ViewGroup params for - isn't the containing group the ViewPager itself? </li> <li>What does isViewFromObject do - how does an object get associated with a view in the first place?</li> <li>Should I be calling startUpdate and finishUdate when I add or remove views?</li> </ul> <p>Thanks.</p>
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