ViewModel LiveData 使用初体验

背景 Fragment 希望不用那么多代码在Fragment中。所以推出了ViewModel加载数据的方式。更加高度的解耦

生命周期

使用

package com.anguomob.love.activity.ui.my

import androidx.lifecycle.LiveData
import androidx.lifecycle.MutableLiveData
import androidx.lifecycle.ViewModel
import com.anguomob.love.bean.UserInfo
import com.anguomob.love.common.PassportManager
import com.anguomob.love.net.usecase.PassportUseCase
import io.reactivex.disposables.CompositeDisposable

class MyViewModel : ViewModel() {
    override fun onCleared() {
        super.onCleared()
    }
    private val _text = MutableLiveData<UserInfo>()
    private val _error = MutableLiveData<Throwable>()
    var dataList: LiveData<UserInfo> = _text
    var error: LiveData<Throwable> = _error
    val mDisposable: CompositeDisposable = CompositeDisposable()
    init {
        val subscribe =
            PassportUseCase().refreshUserInfo(PassportManager.getInstance().getUid()).subscribe({
                it?.let {
                    _text.value=it;

                }

            }, {
                _error.value=it

            })
        mDisposable.add(subscribe)
    }


}

创建 ViewModel 类 并直接加载数据

在Fragment中需要的地方

initData里面把代码用上

private lateinit var dashboardViewModel: MyViewModel

dashboardViewModel =
            ViewModelProvider(this).get(MyViewModel::class.java)
        dashboardViewModel.dataList.observe(viewLifecycleOwner, Observer {
            it?.let {
                PassportManager.getInstance().saveUserInfo(it)
                Glide.with(this)
                    .load(it.avatar)
                    .placeholder(getDefaultPlace(it.sex))
                    .transition(DrawableTransitionOptions.withCrossFade())
                    .into(mIvFDUpload)


                mTvFdNickName.text = it.nick_name;

            }
        })

        dashboardViewModel.error.observe(viewLifecycleOwner, Observer {
            it?.let {
                TipsToast.showTips(activity, ApiErrorCodeDesc.getErrorMsg(it))
            }
        })