refactor(kt-lib): 重构 HttpRequestViewModel 和 RetrofitFactoryFragment

- 重构 HttpRequestViewModel:
  -继承 ViewModel 替代 BaseViewModel
  - 移除 MutableLiveData，改为使用回调函数处理请求结果  - 简化错误处理逻辑

- 更新 RetrofitFactoryFragment:  - 使用 ViewModelProvider 初始化 HttpRequestViewModel
  - 移除 httpRequestResult 的观察者，直接在回调中处理结果
  - 优化数据加载和错误处理逻辑

Author: AndroidCoderPeng

app/src/main/java/com/pengxh/kt/lib/fragments/utils/RetrofitFactoryFragment.kt

@@ -7,12 +7,12 @@ import androidx.lifecycle.ViewModelProvider
 import com.pengxh.kt.lib.databinding.FragmentUtilsRetrofitFactoryBinding
 import com.pengxh.kt.lib.vm.HttpRequestViewModel
 import com.pengxh.kt.lite.base.KotlinBaseFragment
-import com.pengxh.kt.lite.utils.LoadState
+import com.pengxh.kt.lite.extensions.show
 import com.pengxh.kt.lite.utils.LoadingDialog
 
 class RetrofitFactoryFragment : KotlinBaseFragment<FragmentUtilsRetrofitFactoryBinding>() {
 
-    private lateinit var httpRequestViewModel: HttpRequestViewModel
+    private val httpRequestViewModel by lazy { ViewModelProvider(this)[HttpRequestViewModel::class.java] }
 
     override fun initViewBinding(
         inflater: LayoutInflater,
@@ -26,32 +26,25 @@ class RetrofitFactoryFragment : KotlinBaseFragment<FragmentUtilsRetrofitFactoryB
     }
 
     override fun initOnCreate(savedInstanceState: Bundle?) {
-        httpRequestViewModel = ViewModelProvider(this)[HttpRequestViewModel::class.java]
-        httpRequestViewModel.getNewsByPage(requireContext(), "头条", 1)
-        httpRequestViewModel.httpRequestResult.observe(this) {
-            if (it.status == 0) {
-                binding.textView.text = it.result.list.first().title
+        httpRequestViewModel.getNewsByPage(
+            "头条", 1,
+            onLoading = {
+                LoadingDialog.show(requireActivity(), "数据请求中，请稍后...")
+            },
+            onSuccess = {
+                LoadingDialog.dismiss()
+                binding.textView.text = it.result.list.first().content
+            },
+            onFailed = {
+                LoadingDialog.dismiss()
+                it.show(requireContext())
             }
-        }
+        )
     }
 
 
     override fun observeRequestState() {
-        httpRequestViewModel.loadState.observe(this) {
-            when (it) {
-                LoadState.Loading -> {
-                    LoadingDialog.show(requireActivity(), "数据请求中，请稍后...")
-                }
-
-                LoadState.Success -> {
-                    LoadingDialog.dismiss()
-                }
-
-                else -> {
-                    LoadingDialog.dismiss()
-                }
-            }
-        }
+
     }
 
     override fun initEvent() {

app/src/main/java/com/pengxh/kt/lib/vm/HttpRequestViewModel.kt

@@ -1,41 +1,33 @@
 package com.pengxh.kt.lib.vm
 
-import android.content.Context
-import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
 import com.google.gson.Gson
 import com.google.gson.JsonObject
-import com.google.gson.reflect.TypeToken
 import com.pengxh.kt.lib.model.NewsListModel
 import com.pengxh.kt.lib.utils.RetrofitServiceManager
-import com.pengxh.kt.lite.base.BaseViewModel
 import com.pengxh.kt.lite.extensions.launch
-import com.pengxh.kt.lite.extensions.show
-import com.pengxh.kt.lite.utils.LoadState
+import com.pengxh.kt.lite.extensions.unpackingResponse
 
-class HttpRequestViewModel : BaseViewModel() {
+class HttpRequestViewModel : ViewModel() {
 
     val gson by lazy { Gson() }
-    val httpRequestResult = MutableLiveData<NewsListModel>()
 
-    fun getNewsByPage(context: Context, channel: String, start: Int) = launch({
-        loadState.value = LoadState.Loading
+    fun getNewsByPage(
+        channel: String,
+        start: Int,
+        onLoading: () -> Unit,
+        onSuccess: (NewsListModel) -> Unit,
+        onFailed: (String) -> Unit
+    ) = launch({
+        onLoading()
         val response = RetrofitServiceManager.getNewsByPage(channel, start)
         val header = response.getResponseHeader()
         when (header.first) {
-            0 -> {
-                httpRequestResult.value = gson.fromJson<NewsListModel>(
-                    response, object : TypeToken<NewsListModel>() {}.type
-                )
-                loadState.value = LoadState.Success
-            }
-
-            else -> {
-                loadState.value = LoadState.Fail
-                header.second.show(context)
-            }
+            0 -> onSuccess(unpackingResponse<NewsListModel>(response))
+            else -> onFailed(header.second)
         }
     }, {
-        loadState.value = LoadState.Fail
+        onFailed(it.message ?: "Unknown error")
     })
 
     private fun String.getResponseHeader(): Pair<Int, String> {