Fragments - TechStudy

Introduction to Fragments

Fragments Android app development का एक महत्वपूर्ण component है। यह एक modular section होता है जो activity का एक part होता है और अपना own lifecycle रखता है।

Fragments are an important component in Android app development. They are modular sections that are part of an activity and have their own lifecycle.

Key Features (मुख्य विशेषताएं):

Fragments reusable UI components होते हैं
Fragments are reusable UI components
एक activity में multiple fragments हो सकते हैं
Multiple fragments can exist in one activity
Fragments का अपना lifecycle होता है
Fragments have their own lifecycle
Fragments को runtime में add, remove, या replace किया जा सकता है
Fragments can be added, removed, or replaced at runtime

Fragment Lifecycle (फ्रैगमेंट लाइफसाइकल)

Fragment का lifecycle activity के lifecycle से related होता है:

Fragment lifecycle is related to the activity lifecycle:

onAttach(): Fragment activity से attach होता है

onAttach(): Fragment is attached to activity

onCreate(): Fragment create होता है

onCreate(): Fragment is created

onCreateView(): Fragment का UI create होता है

onCreateView(): Fragment's UI is created

onActivityCreated(): Activity create होने के बाद call होता है

onActivityCreated(): Called after activity is created

onStart(): Fragment visible होता है

onStart(): Fragment becomes visible

onResume(): Fragment active होता है

onResume(): Fragment becomes active

onPause(): Fragment partially hidden होता है

onPause(): Fragment becomes partially hidden

onStop(): Fragment hidden होता है

onStop(): Fragment becomes hidden

onDestroyView(): Fragment का UI destroy होता है

onDestroyView(): Fragment's UI is destroyed

onDestroy(): Fragment destroy होता है

onDestroy(): Fragment is destroyed

onDetach(): Fragment activity से detach होता है

onDetach(): Fragment is detached from activity

Implementation Example (इम्प्लीमेंटेशन उदाहरण)

Fragment को implement करने का example:

Example of implementing a fragment:

class MyFragment : Fragment() {
    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_my, container, false)
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        // Initialize views and setup UI
    }

    override fun onPause() {
        super.onPause()
        // Save fragment state
    }
}

Fragment Communication (फ्रैगमेंट कम्युनिकेशन)

Fragments के बीच communication के तरीके:

Ways to communicate between fragments:

Activity Interface: Activity के through communication

Activity Interface: Communication through activity

ViewModel: Shared ViewModel का use करके

ViewModel: Using shared ViewModel

LiveData: LiveData objects के through

LiveData: Through LiveData objects

Fragment Result API: New Fragment Result API का use करके

Fragment Result API: Using new Fragment Result API

Best Practices (सर्वोत्तम प्रथाएं)

Fragments के साथ काम करने के best practices:

Best practices for working with fragments:

Modular Design: UI को small, reusable fragments में break करें

Modular Design: Break UI into small, reusable fragments

State Management: Fragment state को properly manage करें

State Management: Properly manage fragment state

Communication: Fragments के बीच proper communication setup करें

Communication: Set up proper communication between fragments

Back Stack: Fragment transactions को back stack में manage करें

Back Stack: Manage fragment transactions in back stack