Activityda fragmentlarni qanday amalga oshirish…

Activity fragmentlarida ularni deklarativ tarzda XMLda yoki FragmentManager yordamida dasturiy tarzda amalga oshirish mumkin.

Deklarativ tarzda (XMLda):

<fragment
    android:id="@+id/my_fragment"
    android:name="com.example.MyFragment" // Fragment sinfining to'liq nomi
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

Fragment Activity yaratilayotganda qo'shiladi.
Statik maketlar uchun oson.
Dinamik operatsiyalar uchun kamroq moslashuvchan.

Dasturiy tarzda ( FragmentManager yordamida):

// Activity metodida, masalan, onCreate yoki voqea paytida
val fragmentManager = supportFragmentManager // AppCompatActivity uchun
val fragmentTransaction = fragmentManager.beginTransaction()

// Fragment qo'shish
val myFragment = MyFragment()
fragmentTransaction.add(R.id.fragment_container, myFragment)

// Fragmentni almashtirish (mavjudini o'chiradi va yangi qo'shadi)
// val newFragment = NewFragment()
// fragmentTransaction.replace(R.id.fragment_container, newFragment)

// Fragmentni o'chirish
// val fragmentToRemove = fragmentManager.findFragmentById(R.id.fragment_container)
// agar (fragmentToRemove != null) {
//     fragmentTransaction.remove(fragmentToRemove)
// }

// Orqaga qaytish uchun qo'shish (foydalanuvchi "Orqaga" tugmasi bilan oldingi fragmentga qaytishi mumkin)
fragmentTransaction.addToBackStack(null) // Orqa yigin uchun satrli yorliq (null bo'lishi mumkin)

// Transaktsiyani yakunlash
fragmentTransaction.commit() // Asinxron bajarish
// yoki
// fragmentTransaction.commitNow() // Sinkron bajarish

FragmentManager fragmentlarni boshqarish uchun ishlatiladi.
FragmentTransaction operatsiyalarni bajarish uchun ishlatiladi (qo'shish, o'chirish, almashtirish va boshqalar).
Dinamik UI o'zgarishlari uchun katta moslashuvchanlik ta'minlaydi.
Orqa yiginni boshqarish uchun foydalanish mumkin.

Konteynerdan foydalanish:

Dasturiy tarzda fragmentlarni qo'shish yoki almashtirish uchun odatda Activity XML dizaynida konteyner ishlatiladi, masalan, FrameLayout yoki LinearLayout:

<FrameLayout
    android:id="@+id/fragment_container"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

Keyin, Activity kodida, fragment bu konteyner ichida qo'shiladi yoki almashtiriladi.

Muhim jihatlar:

Fragmentning hayot aylanishi Activity hayot aylanishiga yaqin bog'liq.
FragmentManager fragmentlarning hayot aylanishini va holatini boshqaradi.
Fragment transaktsiyasi atomar tarzda bajariladi (yoki butun operatsiya yoki hech narsa).
Orqa yiginni ishlatishda addToBackStack() chaqirilishi shart.
supportFragmentManager yordamida AppCompatActivity bilan fragmentlar bilan ishlash mumkin.

Activityda fragmentlarni qanday amalga oshirish mumkin?