Android MVI 详解

作者: zidea | 来源:发表于2020-02-21 20:12 被阅读0次

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在开始之前就是这张图，我们先创建一个 sealed class 来罗列出用户的所有行为。通常以 intent 结尾。当用户启动应用最开始看到就是 InitialIntent 。这里理解可能有一些困难，这是用户并没有进行任何操作，我们可以从两个角度来理解，可以理解初始化，也可以理解为用户打开应用就是一个行为。因为这里没有任何的数据所以定义为 object 。应该是一个单例吧。当用户刷新界面时候，定义 RefreshIntent。然后我们通过勾选或取消勾选任务来表示任务是否已完成，在 TastIntent 为这两个动作创建对应的 Intent

sealed class TaskIntent{
    
}

sealed class TaskIntent{
    object InitialIntent: TaskIntent()
}

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sealed class TaskIntent{
    object InitialIntent: TaskIntent()
    object RefreshIntent: TaskIntent()
}

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sealed class TaskIntent{
    object InitialIntent: TaskIntent()
    object RefreshIntent: TaskIntent()
    
    data class ActivativeTaskIntent(val task:Task) : TaskIntent()
    data class CompleteTaskIntent(val task):TaskIntent()
}

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sealed class TaskIntent{
    object InitialIntent: TaskIntent()
    object RefreshIntent: TaskIntent()
    
    data class ActivativeTaskIntent(val task:Task) : TaskIntent()
    data class CompleteTaskIntent(val task:Task):TaskIntent()

    object clearCompletedToTaskIntent:TaskIntent()
}

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sealed class TaskIntent{
    object InitialIntent: TaskIntent()
    object RefreshIntent: TaskIntent()
    
    data class ActivativeTaskIntent(val task:Task) : TaskIntent()
    data class CompleteTaskIntent(val task:Task):TaskIntent()

    object clearCompletedToTaskIntent:TaskIntent()

    data class ChangeFilterIntent(val filterType:TaskFilterType):TaskIntent()
}

class TaskFragment{
    fun intents() : Observable<TasksIntent>{
        
    }
}

class TaskFragment{
    fun intents() : Observable<TasksIntent>{
        return initialIntent()
    }

    private fun initialIntent():Observable<InitialIntent>{
        return Observable.just(InitiailIntent)
    }
}

class TaskFragment{
    fun intents() : Observable<TasksIntent>{
        return Observable.merge(initialIntent(),refreshIntent())
    }

    private fun initialIntent():Observable<InitialIntent>{
        return Observable.just(InitiailIntent)
    }

    private fun refreshIntent() :Observable<RefreshIntent>{
        return RxSwipeRefreshLayout.refreshes(swipeRefreshLayout)
            .map{ RefreshIntent }
    }
}

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fun actionFromIntent(Intent: TaskIntent):TaskAction = when(intent){
        is InitialIntent ->
        is RefreshIntent ->
        ...
    }

fun actionFromIntent(Intent: TaskIntent):TaskAction = when(intent){
        is InitialIntent -> LoadAndFilterTaskAction(TaskFilteType.ALL_TASK)
        is RefreshIntent ->
        ...
    }

fun actionFromIntent(Intent: TaskIntent):TaskAction = when(intent){
        is InitialIntent -> LoadAndFilterTaskAction(TaskFilteType.ALL_TASK)
        is RefreshIntent -> LoadTaksAction 
        ...
    }

sealed class TaskAction {
    data class LoadAndFilterTasksAction(val filterType:TaskFilterType):TaskAction()
    object LoadTaskAction:TaskAction()
    ...
}