I have a viewpager, where each page has to show a different WebView. This WebView should allow horizontall scrool, and I want to swipe to next page when the scroll finishes.
I've searched, and find some solutions, but nothing I did resolve this issue. I have a CustomViewPager and a CustomWebView for trying to handle scroll events.
This is my code:
Custom ViewPager
public class WebViewPager extends ViewPager {
public WebViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected boolean canScroll(View v, boolean checkV, int dx, int x, int y) {
if (v instanceof ExtendedWebView) {
return ((ExtendedWebView) v).canScrollHor(-dx);
} else {
return super.canScroll(v, checkV, dx, x, y);
}
}
}
Custom WebView
public class ExtendedWebView extends WebView {
public ExtendedWebView(Context context) {
super(context);
}
public ExtendedWebView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public boolean canScrollHor(int direction) {
final int offset = computeHorizontalScrollOffset();
final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent();
if (range == 0)
return false;
if (direction < 0) {
return offset > 0;
} else {
return offset < range - 1;
}
}
}
ScreenSlidePagerActivity
public class ScreenSlidePagerActivity extends FragmentActivity {
class MyPageAdapter extends FragmentPagerAdapter {
private List<Fragment> fragments;
private List<String> titles;
public MyPageAdapter(FragmentManager fm) {
super(fm);
this.fragments = new ArrayList<Fragment>();
this.titles = new ArrayList<String>();
}
public void addItem(String url, String title) {
Fragment myFragment = new WebViewFragment();
Bundle args = new Bundle();
args.putString("url", url);
myFragment.setArguments(args);
this.fragments.add(myFragment);
this.titles.add(title);
}
@Override
public Fragment getItem(int position) {
return this.fragments.get(position);
}
public CharSequence getPageTitle(int position) {
return this.titles.get(position);
}
@Override
public int getCount() {
return this.fragments.size();
}
}
private MyPageAdapter pageAdapter = null;
private WebViewPager pager = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
pageAdapter = new MyPageAdapter(getSupportFragmentManager());
pageAdapter.addItem("url1", "WebView 1");
pageAdapter.addItem("url2", "WebView 2");
pageAdapter.addItem("url3", "WebView 3");
pager = (WebViewPager) findViewById(R.id.pager);
pager.setOffscreenPageLimit(pageAdapter.getCount() - 1);
pager.setAdapter(pageAdapter);
}
}
Layout of the activity
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingBottom="0dp"
android:paddingLeft="0dp"
android:paddingRight="0dp"
android:paddingTop="0dp"
tools:context=".MainActivity" >
<com.example.viewpagerexample.WebViewPager
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="6dp"
android:paddingTop="0dp" >
<android.support.v4.view.PagerTabStrip
android:id="@+id/pager_header"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:background="#fff"
android:paddingBottom="0dp"
android:paddingLeft="0dp"
android:paddingRight="0dp"
android:paddingTop="0dp"
android:textColor="#000" />
</com.example.viewpagerexample.WebViewPager>
</LinearLayout>
UPDATE The accepted answer only worked if I put this parameter in the CSS of my web page:
display: table;
Apparently, without this parameter the WebView is not able to calculate the width of its content.
