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POViewPager inside a ScrollView does not scroll correclty
 

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  1. POViewPager inside a ScrollView does not scroll correclty
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    <p>I have a 'page' that has a number of components on it, and who's content is longer than the height of the device. Fine, just put all of the layout (the entire page) inside a <code>ScrollView</code>, no problem.</p> <p>One of the components is a <code>ViewPager</code>. This renders correctly, but the response to a swipe/fling is not performing correctly, it is jittery and doesn't always work. It seems to be getting 'confused' with the <code>ScrollView</code>, so only works 100% when you fling in an exact horizontal line.</p> <p>If I remove the <code>ScrollView</code>, the ViewPager responds perfectly.</p> <p>I've had a search around and have not found this as a known defect. Has anyone else experienced this?</p> <ul> <li>Platform Version: 1.6</li> <li>Compatibility Library v4. </li> <li>Device: HTC Incredible S</li> </ul> <p>Below is some example code for you to test with, comment out <code>ScrollView</code> to see it working correctly.</p> <p>Activity:</p> <pre><code>package com.ss.activities; import com.ss.R; import android.app.Activity; import android.content.Context; import android.graphics.Color; 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.TextView; public class PagerInsideScollViewActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); ViewPager vp = (ViewPager) findViewById(R.id.viewpager); vp.setAdapter(new MyPagerAdapter(this)); } } class MyPagerAdapter extends PagerAdapter { private Context ctx; public MyPagerAdapter(Context context) { ctx = context; } @Override public int getCount() { return 2; } @Override public Object instantiateItem(View collection, int position) { TextView tv = new TextView(ctx); tv.setTextSize(50); tv.setTextColor(Color.WHITE); tv.setText("SMILE DUDE, SMILE DUDE, SMILE DUDE, SMILE DUDE, SMILE DUDE, " + "SMILE DUDE, SMILE DUDE, SMILE DUDE, SMILE DUDE, SMILE DUDE, " + "SMILE DUDE, SMILE DUDE, SMILE DUDE, SMILE DUDE, SMILE DUDE, " + "SMILE DUDE, SMILE DUDE, SMILE DUDE"); ((ViewPager) collection).addView(tv); return tv; } @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> <p>Layout:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;ScrollView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" &gt; &lt;LinearLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" &gt; &lt;android.support.v4.view.ViewPager android:id="@+id/viewpager" android:layout_width="fill_parent" android:layout_height="300dp" /&gt; &lt;/LinearLayout&gt; &lt;/ScrollView&gt; </code></pre>
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