viewmodel的封装

最新推荐文章于 2025-12-01 01:14:15 发布

原创最新推荐文章于 2025-12-01 01:14:15 发布 · 512 阅读

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#android

本文介绍了如何在Android开发中封装基础的BaseViewModel类，以及基于RxJava的RxViewModel，提供了一个简单的网络请求示例，展示了如何处理数据加载状态和生命周期绑定。

好久都没有写文章了，突然想写一下

没啥想法，就简单封装一下viewmodel。废话少说，直接上代码

一、定义一个base

open class BaseViewModel : ViewModel() {

    /**
     * 菊花
     */
    val loading = MutableLiveData<Boolean>()

    private var lifecycle: Lifecycle? = null

    private var lifecycleOwner: LifecycleOwner? = null


    fun setLifeCycle(lifecycle: Lifecycle) {
        this.lifecycle = lifecycle
    }

    fun setLifecycleOwner(lifecycleOwner: LifecycleOwner) {
        this.lifecycleOwner = lifecycleOwner
    }


    fun getLifeCycle(): Lifecycle = lifecycle!!


    fun getLifecycleOwner(): LifecycleOwner = lifecycleOwner!!

}

二、以RxJava为例，创建一个RxViewModel继承BaseViewModel，再封装一层

open class RxViewModel : BaseViewModel() {
   fun <T> call(
        request: () -> Observable<T>,
        success: (T) -> Unit,
        failed: (ApiException) -> Unit =
            { ex -> YLogUtils.e("request error->code：${ex.code}，message：${ex.message}") },
        needBindLifecycle: Boolean = true
    ) {
        loading.value = true

        val observer = request.invoke().compose(RxHelper.handleSingleResult())
        if (needBindLifecycle) {
            observer.autoDispose(AndroidLifecycleScopeProvider.from(getLifecycleOwner()))
        }
        observer.subscribe(RxObserver<T>(doNext = {
            loading.value = false
            success.invoke(it)
        }, doError = {
            loading.value = false
            failed.invoke(it)
        }))
    }
}

三、使用示例SimpleRxViewModel

class SimpleRxViewModel constructor(
    private val userRepository: RxUserRepository
) : RxViewModel() {

    private val data = MutableLiveData<String>()

    fun getData(): LiveData<String> {
        return data
    }

    fun getCode(phoneNum: String) {
        YLogUtils.i("获取手机验证码--phoneNum", phoneNum)
        call(request = {
            userRepository.getCode(phoneNum)
        }, success = {
            YLogUtils.i("获取手机验证码--成功", it)
            data.value = it.toString()
        }, failed = {
            YLogUtils.e("getCode failed:${it.code} , ${it.message}")
            data.value = "code：${it.code}，message：${it.message}"
        })
    }
}

没了，就这样！