android-viewpager

How do you create an Android View Pager with a dots indicator?

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All we need are: ViewPager, TabLayout and 2 drawables for selected and default dots. Firstly, we have to add TabLayout to our screen layout, and connect it with ViewPager. We can do this in two ways: Nested TabLayout in ViewPager <androidx.viewpager.widget.ViewPager android:id=”@+id/photos_viewpager” android:layout_width=”match_parent” android:layout_height=”match_parent”> <com.google.android.material.tabs.TabLayout android:layout_width=”match_parent” android:layout_height=”wrap_content”/> </androidx.viewpager.widget.ViewPager> In this case TabLayout will be automatically … Read more

Android.app Fragments vs. android.support.v4.app using ViewPager?

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You can use ViewPager with native fragments from the android.app package with the adapters from the android.support.v13.app package. You have to use the v13 support jar for that. There are two versions of the adapters that work with ViewPager, the ones in the v4 package are meant to be used with support fragments, the ones … Read more

How to implement a ViewPager with different Fragments / Layouts

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As this is a very frequently asked question, I wanted to take the time and effort to explain the ViewPager with multiple Fragments and Layouts in detail. Here you go. ViewPager with multiple Fragments and Layout files – How To The following is a complete example of how to implement a ViewPager with different fragment … Read more

Android ViewPager with bottom dots

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No need for that much code. You can do all this stuff without coding so much by using only viewpager with tablayout. Your main Layout: <RelativeLayout xmlns:android=”http://schemas.android.com/apk/res/android” xmlns:app=”http://schemas.android.com/apk/res-auto” android:layout_width=”match_parent” android:layout_height=”wrap_content”> <android.support.v4.view.ViewPager android:id=”@+id/pager” android:layout_width=”match_parent” android:layout_height=”match_parent”> </android.support.v4.view.ViewPager> <android.support.design.widget.TabLayout android:id=”@+id/tabDots” android:layout_alignParentBottom=”true” android:layout_width=”match_parent” android:layout_height=”wrap_content” app:tabBackground=”@drawable/tab_selector” app:tabGravity=”center” app:tabIndicatorHeight=”0dp”/> </RelativeLayout> Hook up your UI elements inactivity or fragment as follows: Java … Read more

Getting the current Fragment instance in the viewpager

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by selecting an option, I need to update the fragment that is currently visible. A simple way of doing this is using a trick related to the FragmentPagerAdapter implementation: case R.id.addText: Fragment page = getSupportFragmentManager().findFragmentByTag(“android:switcher:” + R.id.pager + “:” + ViewPager.getCurrentItem()); // based on the current position you can then cast the page to the … Read more

Retrieve a Fragment from a ViewPager

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The main answer relies on a name being generated by the framework. If that ever changes, then it will no longer work. What about this solution, overriding instantiateItem() and destroyItem() of your Fragment(State)PagerAdapter: public class MyPagerAdapter extends FragmentStatePagerAdapter { SparseArray<Fragment> registeredFragments = new SparseArray<Fragment>(); public MyPagerAdapter(FragmentManager fm) { super(fm); } @Override public int getCount() { … Read more

viewpager setonpagechangelistener deprecated

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ViewPager.setOnPageChangeListener is deprecated now. Need to use ViewPager.addOnPageChangeListener instead. for example, ViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() { @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { } @Override public void onPageSelected(int position) { } @Override public void onPageScrollStateChanged(int state) { } }); You can find this Here.

Replace Fragment inside a ViewPager

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There is another solution that does not need modifying source code of ViewPager and FragmentStatePagerAdapter, and it works with the FragmentPagerAdapter base class used by the author. I’d like to start by answering the author’s question about which ID he should use; it is ID of the container, i.e. ID of the view pager itself. … Read more

TabLayout tab selection

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If you know the index of the tab you want to select, you can do it like so: TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs); TabLayout.Tab tab = tabLayout.getTabAt(someIndex); tab.select(); This technique works even if you’re using the TabLayout by itself without a ViewPager (which is atypical, and probably bad practice, but I’ve seen it done).

Update ViewPager dynamically?

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When using FragmentPagerAdapter or FragmentStatePagerAdapter, it is best to deal solely with getItem() and not touch instantiateItem() at all. The instantiateItem()–destroyItem()–isViewFromObject() interface on PagerAdapter is a lower-level interface that FragmentPagerAdapter uses to implement the much simpler getItem() interface. Before getting into this, I should clarify that if you want to switch out the actual fragments … Read more