Kami mendapatkan hasil yang benar (Bagian 2). API Hasil Fragmen

Kami melanjutkan cerita tentang hal baru pustaka Jetpack, yang dirancang untuk menyederhanakan pertukaran data antar komponen aplikasi Android. Bagian pertama dikhususkan untuk mentransfer data dari Aktivitas dan Hasil Aktivitas Api baru.  

, Google Fragment. “Single Activity” Android-.

“ ?” - . -: ViewModel, Activity, targetFragment . 

Fragment Result Api . , - . , Api , .

1.3.0-alpha04, FragmentManager FragmentResultOwner. , FragmentManger , . , .

, FragmentManager:

• , FragmentManger setFragmentResultListener()
  
  
  
  . 

  
  
  
  
  

• , FragmentManger Bundle, . setFragmentResult()
  
  
  
  . 

  
  
  
  
  

• FragmentManger , Bundle , . 

  
  
  
  
  

:

Fragment Result Api lifecycle- - , STARTED, DESTROYED. 

“ ” FragmentManger Map:

• Map<String, Bundle>
  
  
  
  ,  

  
  
  
  
  

• Map<String, LifecycleAwareResultListener>
  
  
  
  

  
  
  
  
  

FragmentResultListener, FragmentManager Map, , Map. , , FragmentResultListener LifecycleAwareResultListener.

, FragmentManager . , Map .

.

: ProductsFragment , , SortFragment . Fragment Result Api. 

. , . 

1

ProductsFragment, , FragmentManager. - setFragmentResultListener



fragment-ktx, , .

onCreate():

override fun onCreate(savedInstanceState: Bundle?) {
   super.onCreate(savedInstanceState)
   setFragmentResultListener("request_key") { key, bundle ->
        val selectedSort = bundle.getParcelable<Sort>("extra_key")
        //   
   }
}
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
    

2

SortFragment , setFragmentResult, Bundle. 

applyButton.setOnClickListener {
   setFragmentResult(
      "request_key",
       bundleOf("extra_key" to getSelectedSort())
   )
}
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
    

, Fragment Result Api. 

Api , , FragmentManager  .

FragmentManager

FragmentManager . : parentFragmentManager, childFragmentManager FragmentManager -. , FragmentManager.

master-detail . , FragmentA FragmentB, .

FragmentManager -, .. . FragmentManager requireActivity().supportFragmentManager



parentFragmentManager



.

, , DialogFragment , FragmentA FragmentC. 

, Fragment FragmentA :

• FragmentManager requireActivity().supportFragmentManager

  
  
  
  
  

• FragmentManager FragmentA. , FragmentA childFragmentManager, Fragment parentFragmentManager.

  
  
  
  
  

Lifeycle

, Fragment Result Api lifecycle- - , . . 

- onCreate, STARTED, FragmentManager , - .

STARTED, FragmentManager , ( FragmentManager Map<String, Bundle>, ).

, , “ ” .

, , ( CREATED), , .

, . ? , FragmentManager Map<String, LifecycleAwareListener>, . , .

, : 

• Fragment Result Api , . , targetFrament , targetFrament Deprecated.

  
  
  
  
  

• Api

  
  
  
  
  

• - , view

  
  
  
  
  

• (FragmentManager Parcelable)

  
  
  
  
  

: 

• ,

  
  
  
  
  

• Bundle, . , ClassCastException. 

  
  
  
  
  

, Fragment Result Api , , , .