Databases
StackOverflow2013
Postsdbo
POViewPager PagerAdapter not updating the View
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POViewPager PagerAdapter not updating the View
    primarykey
    data
    text
    <p>I'm using the ViewPager from the compatibility library. I have succussfully got it displaying several views which I can page through.</p> <p>However, I'm having a hard time figuring out how to update the ViewPager with a new set of Views.</p> <p>I've tried all sorts of things like calling <code>mAdapter.notifyDataSetChanged()</code>, <code>mViewPager.invalidate()</code> even creating a brand new adapter each time I want to use a new List of data.</p> <p>Nothing has helped, the textviews remain unchanged from the original data.</p> <p><strong>Update:</strong> I made a little test project and I've almost been able to update the views. I'll paste the class below.</p> <p>What doesn't appear to update however is the 2nd view, the 'B' remains, it should display 'Y' after pressing the update button.</p> <pre><code>public class ViewPagerBugActivity extends Activity { private ViewPager myViewPager; private List&lt;String&gt; data; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); data = new ArrayList&lt;String&gt;(); data.add("A"); data.add("B"); data.add("C"); myViewPager = (ViewPager) findViewById(R.id.my_view_pager); myViewPager.setAdapter(new MyViewPagerAdapter(this, data)); Button updateButton = (Button) findViewById(R.id.update_button); updateButton.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { updateViewPager(); } }); } private void updateViewPager() { data.clear(); data.add("X"); data.add("Y"); data.add("Z"); myViewPager.getAdapter().notifyDataSetChanged(); } private class MyViewPagerAdapter extends PagerAdapter { private List&lt;String&gt; data; private Context ctx; public MyViewPagerAdapter(Context ctx, List&lt;String&gt; data) { this.ctx = ctx; this.data = data; } @Override public int getCount() { return data.size(); } @Override public Object instantiateItem(View collection, int position) { TextView view = new TextView(ctx); view.setText(data.get(position)); ((ViewPager)collection).addView(view); return view; } @Override public void destroyItem(View collection, int position, Object view) { ((ViewPager) collection).removeView((View) view); } @Override public boolean isViewFromObject(View view, Object object) { return view == object; } @Override public Parcelable saveState() { return null; } @Override public void restoreState(Parcelable arg0, ClassLoader arg1) { } @Override public void startUpdate(View arg0) { } @Override public void finishUpdate(View arg0) { } } } </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USC0deAttack
    plurals
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    3. PL
      singulars
      1. LTLinked
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTDuplicate
    3. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POViewPager PagerAdapter not updating the View
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POViewPager PagerAdapter not updating the View
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POViewPager PagerAdapter not updating the View
      1. This table or related slice is empty.
      1. VTUpMod
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload