添加okhttp, retrofit配合协程使用

app/src/main/java/io/legado/app/base/BaseViewModel.kt

@@ -13,13 +13,12 @@ open class BaseViewModel(application: Application) : AndroidViewModel(applicatio
     private val launchManager: MutableList<Job> = mutableListOf()
 
     protected fun launchOnUI(
-        tryBlock: suspend CoroutineScope.() -> Unit,
-        cacheBlock: suspend CoroutineScope.(Throwable) -> Unit,
-        finallyBlock: suspend CoroutineScope.() -> Unit,
-        handleCancellationExceptionManually: Boolean
+        tryBlock: suspend CoroutineScope.() -> Unit,//成功
+        errorBlock: suspend CoroutineScope.(Throwable) -> Unit,//失败
+        finallyBlock: suspend CoroutineScope.() -> Unit//结束
     ) {
         launchOnUI {
-            tryCatch(tryBlock, cacheBlock, finallyBlock, handleCancellationExceptionManually)
+            tryCatch(tryBlock, errorBlock, finallyBlock)
         }
     }
 
@@ -27,25 +26,20 @@ open class BaseViewModel(application: Application) : AndroidViewModel(applicatio
      * add launch task to [launchManager]
      */
     private fun launchOnUI(block: suspend CoroutineScope.() -> Unit) {
-        val job = launch { block() }
+        val job = launch { block() }//主线程
         launchManager.add(job)
         job.invokeOnCompletion { launchManager.remove(job) }
     }
 
     private suspend fun tryCatch(
         tryBlock: suspend CoroutineScope.() -> Unit,
-        catchBlock: suspend CoroutineScope.(Throwable) -> Unit,
-        finallyBlock: suspend CoroutineScope.() -> Unit,
-        handleCancellationExceptionManually: Boolean = false
+        errorBlock: suspend CoroutineScope.(Throwable) -> Unit,
+        finallyBlock: suspend CoroutineScope.() -> Unit
     ) {
         try {
             coroutineScope { tryBlock() }
         } catch (e: Throwable) {
-            if (e !is CancellationException || handleCancellationExceptionManually) {
-                coroutineScope { catchBlock(e) }
-            } else {
-                throw e
-            }
+            coroutineScope { errorBlock(e) }
         } finally {
             coroutineScope { finallyBlock() }
         }

app/src/main/java/io/legado/app/data/api/CommonHttpApi.kt

@@ -0,0 +1,14 @@
+package io.legado.app.data.api
+
+import kotlinx.coroutines.Deferred
+import retrofit2.http.*
+
+interface CommonHttpApi {
+
+    @GET
+    fun get(@Url url: String, @QueryMap map: Map<String, String>): Deferred<String>
+
+    @FormUrlEncoded
+    @POST
+    fun post(@Url url: String, @FieldMap map: Map<String, String>): Deferred<String>
+}

app/src/main/java/io/legado/app/help/http/CoroutinesCallAdapterFactory.kt

@@ -6,10 +6,10 @@ import retrofit2.*
 import java.lang.reflect.ParameterizedType
 import java.lang.reflect.Type
 
-class CoroutineCallAdapterFactory private constructor() : CallAdapter.Factory() {
+class CoroutinesCallAdapterFactory private constructor() : CallAdapter.Factory() {
     companion object {
         @JvmStatic @JvmName("create")
-        operator fun invoke() = CoroutineCallAdapterFactory()
+        operator fun invoke() = CoroutinesCallAdapterFactory()
     }
 
     override fun get(

app/src/main/java/io/legado/app/help/http/HttpHelper.kt

@@ -1,6 +1,7 @@
 package io.legado.app.help.http
 
 import okhttp3.*
+import retrofit2.Retrofit
 import java.util.*
 import java.util.concurrent.TimeUnit
 
@@ -9,6 +10,20 @@ object HttpHelper {
     val client: OkHttpClient = getOkHttpClient()
 
 
+    fun <T> getApiService(baseUrl: String, clazz: Class<T>): T {
+        return getRetrofit(baseUrl).create(clazz)
+    }
+
+    fun getRetrofit(baseUrl: String): Retrofit {
+        return Retrofit.Builder().baseUrl(baseUrl)
+            //增加返回值为字符串的支持(以实体类返回)
+//            .addConverterFactory(EncodeConverter.create())
+            //增加返回值为Observable<T>的支持
+            .addCallAdapterFactory(CoroutinesCallAdapterFactory.invoke())
+            .client(client)
+            .build()
+    }
+
     private fun getOkHttpClient(): OkHttpClient {
         val cs = ConnectionSpec.Builder(ConnectionSpec.MODERN_TLS)
             .tlsVersions(TlsVersion.TLS_1_2)

app/src/main/java/io/legado/app/ui/search/SearchViewModel.kt

@@ -1,18 +1,39 @@
 package io.legado.app.ui.search
 
 import android.app.Application
+import android.util.Log
 import androidx.lifecycle.LiveData
 import androidx.lifecycle.MutableLiveData
 import io.legado.app.base.BaseViewModel
+import io.legado.app.data.api.CommonHttpApi
 import io.legado.app.data.entities.SearchBook
+import io.legado.app.help.http.HttpHelper
+import kotlinx.coroutines.Dispatchers.IO
+import kotlinx.coroutines.withContext
 
 class SearchViewModel(application: Application) : BaseViewModel(application) {
 
     val searchBooks: LiveData<List<SearchBook>> = MutableLiveData()
 
-    public fun search(){
+    public fun search(start: () -> Unit, finally: () -> Unit) {
+        launchOnUI(
+            {
+                start()
+                val searchResponse = withContext(IO) {
+                    HttpHelper.getApiService(
+                        "http:www.baidu.com",
+                        CommonHttpApi::class.java
+                    ).get("", mutableMapOf())
+                }
 
+                val result = searchResponse.await()
+            },
+            { Log.i("TAG", "${it.message}") },
+            { finally() })
 
+//        GlobalScope.launch {
+//
+//        }
     }
 
 }