How to implement a ViewPager with different Fragments / Layouts

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

Passing data between a fragment and its container activity

Try using interfaces. Any fragment that should pass data back to its containing activity should declare an interface to handle and pass the data. Then make sure your containing activity implements those interfaces. For example: JAVA In your fragment, declare the interface… public interface OnDataPass { public void onDataPass(String data); } Then, connect the containing … Read more

How do I make WRAP_CONTENT work on a RecyclerView

From Android Support Library 23.2.1 update, all WRAP_CONTENT should work correctly. Please update version of a library in gradle file OR to further : compile ‘com.android.support:recyclerview-v7:23.2.1’ solved some issue like Fixed bugs related to various measure-spec methods Check http://developer.android.com/tools/support-library/features.html#v7-recyclerview you can check Support Library revision history

Android. Fragment getActivity() sometimes returns null

It seems that I found a solution to my problem. Very good explanations are given here and here. Here is my example: pulic class MyActivity extends FragmentActivity{ private ViewPager pager; private TitlePageIndicator indicator; private TabsAdapter adapter; private Bundle savedInstanceState; @Override public void onCreate(Bundle savedInstanceState) { …. this.savedInstanceState = savedInstanceState; pager = (ViewPager) findViewById(R.id.pager);; indicator = … Read more

getActivity() returns null in Fragment function

commit schedules the transaction, i.e. it doesn’t happen straightaway but is scheduled as work on the main thread the next time the main thread is ready. I’d suggest adding an onAttach(Activity activity) method to your Fragment and putting a break point on it and seeing when it is called relative to your call to asd(). … Read more

How to transfer some data to another Fragment?

Use a Bundle. Here’s an example: Fragment fragment = new Fragment(); Bundle bundle = new Bundle(); bundle.putInt(key, value); fragment.setArguments(bundle); Bundle has put methods for lots of data types. See this Then in your Fragment, retrieve the data (e.g. in onCreate() method) with: Bundle bundle = this.getArguments(); if (bundle != null) { int myInt = bundle.getInt(key, … Read more

Getting the current Fragment instance in the viewpager

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

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