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POAndroid ViewPager doesn't remove old views from screen
 

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  1. POAndroid ViewPager doesn't remove old views from screen
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    <p>I'm trying to add a pageviewer to my app that simply show some images that explaing how the app work but I'm encountering a lot of problem... The first page it's correctly showed but when I drag to next pages all pages that I've just seen stay in background and it's cause weird visualization.</p> <p>Here my code...</p> <pre><code>import android.app.Activity; import android.os.Bundle; import android.os.Parcelable; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.view.View; import android.widget.ImageView; public class ViewPagerActivity extends Activity { private static int NUM_VIEWS = 5; private MyPagerAdapter adapter; private ViewPager pager; private int[] pics = { R.drawable.bookmarks, R.drawable.bookmarks_click, R.drawable.help, R.drawable.help_click, R.drawable.logo_wil }; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_view_pager); adapter = new MyPagerAdapter(); pager = (ViewPager) findViewById(R.id.mypager); pager.setAdapter(adapter); } private class MyPagerAdapter extends PagerAdapter { @Override public int getCount() { return NUM_VIEWS; } /** * Create the page for the given position. The adapter is responsible * for adding the view to the container given here, although it only * must ensure this is done by the time it returns from * {@link #finishUpdate()}. * * @param container * The containing View in which the page will be shown. * @param position * The page position to be instantiated. * @return Returns an Object representing the new page. This does not * need to be a View, but can be some other container of the * page. */ @Override public Object instantiateItem(View collection, int position) { ImageView view = new ImageView(ViewPagerActivity.this); view.setImageResource(pics[position]); ((ViewPager) collection).addView(view, 0); return view; } /** * Remove a page for the given position. The adapter is responsible for * removing the view from its container, although it only must ensure * this is done by the time it returns from {@link #finishUpdate()}. * * @param container * The containing View from which the page will be removed. * @param position * The page position to be removed. * @param object * The same object that was returned by * {@link #instantiateItem(View, int)}. */ @Override public void destroyItem(View collection, int position, Object view) { ((ViewPager) collection).removeView((ImageView) view); } @Override public boolean isViewFromObject(View view, Object object) { return view == ((ImageView) object); } /** * Called when the a change in the shown pages has been completed. At * this point you must ensure that all of the pages have actually been * added or removed from the container as appropriate. * * @param container * The containing View which is displaying this adapter's * page views. */ @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>
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    1. PTQuestion
    1. This table or related slice is empty.
    1. USLuca Panteghini
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    1. COyou can set off screen pages using the method of viewpager. It will compulsory create 2 pages: 1 is before the current page and other is after the current page.
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      1. POAndroid ViewPager doesn't remove old views from screen
      1. USSandeep
    2. COCan you explain _"stay in background and it's cause weird visualization"_ more clearly?
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      1. POAndroid ViewPager doesn't remove old views from screen
      1. USAmulya Khare
    3. CO@Amulya Khare The first time I view image1 correctly, when a swipe to right (for example) I view image2 and near image1 and not only image2.
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      1. POAndroid ViewPager doesn't remove old views from screen
      1. USLuca Panteghini
 

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