I have made a swipe tabs using fragments. But is possible to use activities instead of fragments? For example. I have 3 swipetabs, "View","Add","Delete" and 3 seperate activities for each on of these functions. Is there a way that if a swap from "View" to "Add", it takes me to the "Add" activity, an so on.
As i don't have enough reputation i cannot comment on this so am answering. Instead of using activity try to use fragment as google suggests you can do everything in fragments same as you can do in activity infact you can do more thing in fragments so i recommend you to use fragments so please take a look at communication between two fragments https://developer.android.com/training/basics/fragments/communicating.html
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I used to have 3 activities with 3 layouts.
1. HomeActivity.java (activity_home.xml)
2. HelpActivity.java (activity_help.xml)
3. SettingsActivity.java (activity_settings.xml)
Whenever i had to open other activities, i used animated slide-in-out intents using overridePendingIntent. In this way, all the variables of HomeActivity stayed in itself and HelpActivity's variables/methods were in itself and same for SettingsActivity. I used onCreate() in these to perform some activity specific code. and, android:onClick="fetchSarcasm" from activity_home.xml was calling specified method in HomeActivity.java. So, there were no conflicts. All the normal things, that happen in an AndroidProject with 3 activities and used intents to switch to one another, were happening as i wanted.
But now, I wanted to migrate to ViewPager instead of slide-in-out intent transitions. In this way, there will be only one Activity with an XML of ViewPager. This ViewPager and its FragmentPagerAdapter gets the Pages from 3 classes extending Fragment with relative XML layouts.
I want to ask: Where do i write my Page Specific Code for onCreate(), layoutView's onClick="" and for onChangeListeners. Because, 3 classes extending Fragment do not have any Context or findViewById() and they do not respond to android:onClick="method" in different layouts.
Do i need to mix all that code of three activities into one containing ViewPager? If so, this makes ViewPager activity pretty heavy. and, writing if(page=2){ dothis(); } seems absurd for all pages at every code point. Any checkbox(view) that is in page 3, becomes null in other pages.
I know this might be a stupid question. I have spent almost 4 days trying to achieve something but i can't. Also, this is just my 2nd month in android, so i am new. I do not use Action Bars, Tabbed Bars or Navigation Drawers.
I am available on SO Chat too if you want to ask something more.
I just want to know how do i merge all the work i did when I was not using ViewPager.
If you're only reading the Preferences once for each Fragment, you can move your previous Activity.onCreate() logic to each Fragments onViewCreated() or onCreateView(). Read your shared Preferences there and set your Checkboxes accordingly.
Fragments inside a ViewPager aren't necessarily recreated on each page change. You can change how many Fragments are instantiated at a time with ViewPager.setOffscreenPageLimit(int).
Fragment Lifecycles explained
In my requirements i need to add multiple nested fragments as am using navigation drawer as a main navigation so am using nested fragments like lets say Fragment a->b->c->d-> like that i have created is that a right way to do with using multiple fragments like would cost anything for application ? As beginner am very confused what to do with is it a bad practice i may be dumb question ! any solution you people are here to help beginner like us thanks in advance!
This is not a bad practice, but mostly we should keep fragments in Activity, instead nesting them which is complex but sometimes, it also depends on design of apps, which we must have to follow either by nested fragments or whatever.
In case of Navigation Drawer, you can be enough by adding fragment to navigation list items click and then start activity on fragment click.
Fragments are very useful.
An Activty can have multiple fragments ,and fragments cannot have fragments inside them.
In Android 4.2 there was support for Nested Fragments Where you can use fragment inside other fragment. But your fragment must be dynamic.
Thanks
What scenarios using fragments what scenario using the activity , How can I make sure you when to use the activity when using fragments ！
Basically, when you want a fixed portion of the screen and the rest will be changing, you want to use fragments.
If all your app is going to be on different screens, you want to use Activities.
Anyway, at least you will need one activity to hold your fragments.
Hope this helps.
As i know,You need to extend the fragment when you are displaying the view into tabs.
Otherwise you can extend activity.
It depends on your requirement. if u want to expose your toolbar throughout your application you can use fragment both activity and fragment are quite similar . You can also use only one activity remaining things may be your fragment
It depends on UI which you are creating.
If you are creating Multi-Pane UI then you should use Fragment.
And if you are creating some part of screen which can be reused then for that part you should create Fragment as Fragment is meant for re-usability.
If you are creating stand-alone screen then you should use Activity
For more info please refer this link How to choose Activity or Fragment if both scenarios are possible?
I am developping an app with an activity which switches between a few fragments. I was wondering if it is possible to have one of this fragment with tabs in the action bar, but not the other ones, knowing that, in general, the activity is tabbed and the tabs switch between fragments.
In a nutshell, I want an activity with a few fragments, and one of this fragments should have tabs to browse between other fragments, is that possible?
Ofcourse it is possible, take a look around StackOverflow, there are a couple of questions already.
Instead of normal TabHost your should use FragmentTabHost and because you will have fragments inside a fragment, you will have to use getChildFragmentManager() instead of getFragmentManager().
Adding tab inside fragment
Nice post Marko! I was just typing up basically the same answer. Here is a link for the documentation on Nested Fragments hope that helps as well
I'm trying to create a layout that has a stationary footer with activities that slide behind it. I've been told to use Fragments, but that would mean that I would have to convert my already existing Activities to Fragments - right? Here is a diagram of what I'm trying to achieve: http://i.imgur.com/K8Iao.jpg
What I think #TarunMaheshwari is trying to say is that instead of having 3 activities (eg. classes with extends activity), replace it with extends fragment (obviously there are other minor changes you might have to make for the code to work) and then create a main activity (with extends FragmentActivity) that has the static footer you want which can call on the 3 different fragments.
Recommended readings:
http://developer.android.com/guide/topics/fundamentals/fragments.html
http://android-developers.blogspot.ca/2011/02/android-30-fragments-api.html
I believe using fragments is the right solution for your app. However, from what I understand from your question and comments, you really want to avoid using them. To use activities instead of fragments, implement a Tab Layout with a Tab Host and Tab Widget as explained in this tutorial. This solution allows you to use the tabs to switch between activities.
To align the Tab Host to the bottom of the screen, have a look at this tutorial.