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POViewPager not showing correct View
 

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  1. POViewPager not showing correct View
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    <p>I'm using the V4 compatibility JAR. I have a ViewPager that shows information about some bands. When I create the PagerAdapter, I pass it an ArrayList of Band objects.</p> <p>In the emulator, it always shows shows the 2nd band in the ArrayList's information first. When I flip to the last view, the view always has no data. When I flip back and forth, the data then gets really buggy.</p> <p><strong>BandsActivity</strong></p> <pre><code>private ViewPager mBandsPager; private BandsPagerAdapter mBandsPagerAdapter; private static final String TAG = "Paging"; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.awesomepager); // Build a couple bands; ArrayList&lt;Band&gt; bands = new ArrayList&lt;Band&gt;(); bands.add(new Band(1, "Led Zeppelin")); bands.add(new Band(37, "Brand New")); bands.add(new Band(49, "Jay-Z")); mBandsPagerAdapter = new BandsPagerAdapter(this, bands); mBandsPager = (ViewPager) findViewById(R.id.awesomepager); mBandsPager.setAdapter(mBandsPagerAdapter); } </code></pre> <p><strong>BandsPagerAdapter</strong></p> <pre><code>private Context mCtx; private ArrayList&lt;Band&gt; mBands; public BandsPagerAdapter(Context ctx, ArrayList&lt;Band&gt; bands) { mCtx = ctx; mBands = bands; } @Override public int getCount() { return mBands.size(); } @Override public Object instantiateItem(View collection, int position) { // Inflate and create the view LayoutInflater layoutInflater = (LayoutInflater)mCtx.getSystemService(Context.LAYOUT_INFLATER_SERVICE); View view = layoutInflater.inflate(R.layout.featured_bands_layout, null); // Build UI TextView name = (TextView)collection.findViewById(R.id.featured_band_name); // Populate UI with band data Band band = mBands.get(position); if(name != null) { name.setText("Name: " + band.getName() + ", Pos: " + position); } // Add View to the ViewPager collection ((ViewPager)collection).addView(view,0); return view; } @Override public void destroyItem(View collection, int position, Object view) { ((ViewGroup) collection).removeView((View)view); } @Override public boolean isViewFromObject(View view, Object object) { return view==((View)object); } @Override public void finishUpdate(View arg0) {} @Override public void restoreState(Parcelable arg0, ClassLoader arg1) {} @Override public Parcelable saveState() { return null; } @Override public void startUpdate(View arg0) {} </code></pre> <p>Any suggestions? I saw a mention of implementing ViewPager.SimpleOnPageChangeListener, but didn't see how it could be used properly.</p>
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    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USAndy Lawton
    1. USAndy Lawton
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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    1. VO
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      1. POViewPager not showing correct View
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
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      1. POViewPager not showing correct View
      1. This table or related slice is empty.
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    3. VO
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      1. POViewPager not showing correct View
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    1. COit's nothing related to answer, but change "collection.findViewById" to "view.findViewById", it's more appropriate.
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      1. POViewPager not showing correct View
      1. USYashwanth Kumar
    2. COYou activity will b re-created when you rotate your screen, thus the context will be changed; so in way, your pageadaptor is holding on to a context that should no longer exist, and will result in a memory leak!
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      1. POViewPager not showing correct View
      1. USRaunak
    3. COThat turns out to be the right answer! I needed to use the view object I just inflated. TextView name = (TextView)view.findViewById(R.id.featured_band_name);
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      1. POViewPager not showing correct View
      1. USAndy Lawton
 

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