PageStatusTransformer

A low invasive state management on Android

中文版

Feature

• Declare your own state

val transformer =
    PageStatusTransformer.newInstance {
        "Normal" { 
            SimpleState(contentView)
        }
        "Loading" {
            MyLoadingPageState()
        }
        "Empty" {
            MyEmptyPageState()
        }
        //Can be any string or enum
        "Error" {
            MyErrorPageState()
        }
    }
//transform to your state by its name
transformer.transform("Empty")
//or by enum
transformer.transform(YourCustomEnum.State1)

• Replace the origin View

  PageStatusTransformer.newInstance(
    replaceTo = contentView /*contentView would be replaced by the new ui which has the same size and parent */
  ) { 
    State1 {...}
    State2 {...}
  }

  The view of the original page can be specified by the optional parameter replaceTo.
  When a transform occurs, the view in the new state will dynamically replace the view in the old state.

Therefore, there is no need to put a so-called <StatusLayout ></StatusLayout> in XML, and it is not necessary to
plug the business into BaseActivity or BaseFragment.

• Different ways to toggle the visibility of View

  PageStatusTransformer.newInstance(...) { 
    State1 {
        SimpleStatus(view) 
    }
    State2 {
        ViewStubStatus(viewStub)
    }
    State3 {
        ReplacementViewStatus(view)
    }
  }

SimpleStatus supports only changing the visibility of the state UI, which is applicable to the state
that exists in the layout for a long time, such as the normal state.

ViewStubStatus which supports rendering only when used, is suitable for states in lazy loading layouts.

ReplacementViewStatus supports dynamic adding and removing state UI, which is suitable for temporary
state existing in layout.

• Custom State

  PageStatusTransformer.newInstance(replaceTo = ...) { 
    "State 1" {
        object: PageDisplayStatus {
            override fun showView(){
                //how to show state 1
            }
            override fun hideView(){
                //how to hide state 1
            }
        }
    }
    "State 2" {
        object: ReplacementViewStatus() {
            override fun inflateView(inflater: LayoutInflater, parent: ViewGroup): View {
                return inflater.inflate(...., parent, false)
            }
            override fun onViewShow(){...}
            override fun onViewHide(){...}
        }
    }
    ...
  }

Java support

Adapting Java language to Kotlin DSL:

PageStatusTransformer transformer = PageStatusTransformer.newInstance(mRecyclerView, 
    new JavaViewStatusBuilder()
        .putStatus("Normal", new SimpleStatus(mRecyclerView))
        .putStatus("Empty", new YouCustomStatus("No Data"))
        .putStatus("Error", new YouCustomStatus("Sorry! An error happen"))
        .putStatus("Loading"，new YouCustomStatus("Loading"))
        .build()
);
transformer.transform("Empty");

Install

repositories {
    ...
    maven { url 'https://jitpack.io' }
}
dependencies {
    implementation 'com.github.YvesCheung:PageStatusTransformer:x.y.z'
}

version replace with