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How to convert a List<Object> to PagedList<Object> and vice-versa?

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长情又很酷
长情又很酷 2021-02-12 07:00

PagedList is used for Android\'s cool paging library. To make the question as minimal as possible : If i have a list of strings like

          


        
      
      
      

        

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                 天涯浪人 
              
              
    
                
                   天涯浪人
                                             
                
                
                (楼主)
            
              
                  
    
                2021-02-12 08:07
              
    

            
    
            
    
              
              

    I have converted a List to PagedList by this code in kotlin
i think this code can help you
    


      

    1. build config 
      


      private val config = PagedList.Config.Builder()
        .setEnablePlaceholders(false)
        .setPageSize(LIST_SIZE)
        .build()

      2. 

    


    2.create these classes for convert and return my PagedList
    


         class ListDataSource(private val items: List) : PositionalDataSource() {
            override fun loadInitial(params: LoadInitialParams, callback: LoadInitialCallback) {
                callback.onResult(items, 0, items.size)
    }

            override fun loadRange(params: LoadRangeParams, callback: LoadRangeCallback) {
                val start = params.startPosition
                val end = params.startPosition + params.loadSize
                callback.onResult(items.subList(start, end))
    }
}

        // UiThreadExecutor implementation example
       class UiThreadExecutor : Executor {
            private val handler = Handler(Looper.getMainLooper())
            override fun execute(command: Runnable) {
               handler.post(command)
    }
}

    


      

    1. Pass val myList: List by config and get PagedList
      


      val pagedList = PagedList.Builder(ListDataSource(myList), config)
                            .setNotifyExecutor(UiThreadExecutor())
                            .setFetchExecutor(AsyncTask.THREAD_POOL_EXECUTOR)
                            .build()

      

    
      
             
      
                                                        
      
            
            
      
              
                
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