Conseguimos o resultado certo (Parte 2). API Fragment Result

Continuamos a história das novidades da biblioteca Jetpack, projetada para simplificar a troca de dados entre os componentes de um aplicativo Android. A primeira parte foi dedicada à transferência de dados da Activity e do novo Api Activity Result.  

, 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 , , , .