diff --git a/app/src/main/java/io/legado/app/base/adapter/CommonRecyclerAdapter.kt b/app/src/main/java/io/legado/app/base/adapter/CommonRecyclerAdapter.kt
index 30f8f794f..d39022f7e 100644
--- a/app/src/main/java/io/legado/app/base/adapter/CommonRecyclerAdapter.kt
+++ b/app/src/main/java/io/legado/app/base/adapter/CommonRecyclerAdapter.kt
@@ -198,8 +198,21 @@ abstract class CommonRecyclerAdapter<ITEM>(protected val context: Context) : Rec
         synchronized(lock) {
             val size = getActualItemCount()
             if (oldPosition in 0 until size && newPosition in 0 until size) {
-                Collections.swap(this.items, oldPosition + getHeaderCount(), newPosition + getHeaderCount())
-                notifyDataSetChanged()
+                val srcPosition = oldPosition + getHeaderCount()
+                val targetPosition = newPosition + getHeaderCount()
+                Collections.swap(this.items, srcPosition, targetPosition)
+                notifyItemChanged(srcPosition)
+                notifyItemChanged(targetPosition)
+            }
+        }
+    }
+
+    fun updateItem(item: ITEM) {
+        synchronized(lock) {
+            val index = this.items.indexOf(item)
+            if (index >= 0) {
+                this.items[index] = item
+                notifyItemChanged(index)
             }
         }
     }
diff --git a/app/src/main/java/io/legado/app/base/adapter/ItemViewDelegate.kt b/app/src/main/java/io/legado/app/base/adapter/ItemViewDelegate.kt
index b4cd06a2f..2ac1090f2 100644
--- a/app/src/main/java/io/legado/app/base/adapter/ItemViewDelegate.kt
+++ b/app/src/main/java/io/legado/app/base/adapter/ItemViewDelegate.kt
@@ -7,7 +7,7 @@ import android.content.Context
  *
  * item代理，
  */
-abstract class ItemViewDelegate<in ITEM>(protected val context: Context, val layoutId: Int) {
+abstract class ItemViewDelegate<ITEM>(protected val context: Context, val layoutId: Int) {
 
     abstract fun convert(holder: ItemViewHolder, item: ITEM, payloads: MutableList<Any>)
 
diff --git a/app/src/main/java/io/legado/app/help/coroutine/Coroutine.kt b/app/src/main/java/io/legado/app/help/coroutine/Coroutine.kt
index 26d1c7c5e..030295275 100644
--- a/app/src/main/java/io/legado/app/help/coroutine/Coroutine.kt
+++ b/app/src/main/java/io/legado/app/help/coroutine/Coroutine.kt
@@ -30,6 +30,15 @@ class Coroutine<T>() {
 
     private var errorReturn: Result<T>? = null
 
+    val isCancelled: Boolean
+        get() = job?.isCancelled ?: false
+
+    val isActive: Boolean
+        get() = job?.isActive ?: false
+
+    val isCompleted: Boolean
+        get() = job?.isCompleted ?: false
+
     private constructor(
         scope: CoroutineScope,
         block: suspend CoroutineScope.() -> T
@@ -106,24 +115,24 @@ class Coroutine<T>() {
     private suspend fun executeInternal(block: suspend CoroutineScope.() -> T) {
         tryCatch(
             {
-                start?.let { it() }
+                start?.invoke(this)
 
                 val result = executeBlock(block, timeMillis ?: 0L)
 
-                success?.let { it(result) }
+                success?.invoke(this, result)
             },
             { e ->
                 val consume: Boolean = errorReturn?.value?.let { value ->
-                    success?.let { it(value) }
+                    success?.invoke(this, value)
                     true
                 } ?: false
 
                 if (!consume) {
-                    error?.let { it(e) }
+                    error?.invoke(this, e)
                 }
             },
             {
-                finally?.let { it() }
+                finally?.invoke(this)
             })
     }
 
@@ -142,9 +151,9 @@ class Coroutine<T>() {
         try {
             coroutineScope { tryBlock() }
         } catch (e: Throwable) {
-            coroutineScope { errorBlock?.let { it(e) } }
+            coroutineScope { errorBlock?.invoke(this, e) }
         } finally {
-            coroutineScope { finallyBlock?.let { it() } }
+            coroutineScope { finallyBlock?.invoke(this) }
         }
     }
 
diff --git a/app/src/main/java/io/legado/app/model/WebBook.kt b/app/src/main/java/io/legado/app/model/WebBook.kt
index 242510ee9..43882e881 100644
--- a/app/src/main/java/io/legado/app/model/WebBook.kt
+++ b/app/src/main/java/io/legado/app/model/WebBook.kt
@@ -13,6 +13,9 @@ import io.legado.app.model.webbook.BookList
 
 class WebBook(private val bookSource: BookSource) {
 
+    val sourceUrl: String
+        get() = bookSource.bookSourceUrl
+
     fun searchBook(key: String, page: Int?, isSearch: Boolean = true): Coroutine<List<SearchBook>> {
         return Coroutine.async {
             bookSource.getSearchRule().searchUrl?.let { searchUrl ->
diff --git a/app/src/main/java/io/legado/app/model/webbook/SourceDebug.kt b/app/src/main/java/io/legado/app/model/webbook/SourceDebug.kt
index 2155cf3c5..03e9d0446 100644
--- a/app/src/main/java/io/legado/app/model/webbook/SourceDebug.kt
+++ b/app/src/main/java/io/legado/app/model/webbook/SourceDebug.kt
@@ -4,23 +4,26 @@ import android.annotation.SuppressLint
 import io.legado.app.data.entities.Book
 import io.legado.app.data.entities.BookChapter
 import io.legado.app.help.BookHelp
+import io.legado.app.help.coroutine.Coroutine
 import io.legado.app.model.WebBook
 import io.legado.app.utils.htmlFormat
+import io.legado.app.utils.isAbsUrl
 import java.text.SimpleDateFormat
 import java.util.*
 
 class SourceDebug(private val webBook: WebBook, callback: Callback) {
 
     companion object {
-        var debugSource: String? = null
-        var callback: Callback? = null
+        private var debugSource: String? = null
+        private var callback: Callback? = null
+        private val tasks: MutableList<Coroutine<*>> = mutableListOf()
+
         @SuppressLint("ConstantLocale")
         private val DEBUG_TIME_FORMAT = SimpleDateFormat("[mm:ss.SSS]", Locale.getDefault())
         private val startTime: Long = System.currentTimeMillis()
 
         fun printLog(sourceUrl: String?, state: Int, msg: String, print: Boolean = true, isHtml: Boolean = false) {
-            if (debugSource != sourceUrl) return
-            if (!print) return
+            if (debugSource != sourceUrl || callback == null || !print) return
             var printMsg = msg
             if (isHtml) {
                 printMsg = printMsg.htmlFormat()
@@ -29,18 +32,46 @@ class SourceDebug(private val webBook: WebBook, callback: Callback) {
                 String.format("%s %s", DEBUG_TIME_FORMAT.format(Date(System.currentTimeMillis() - startTime)), printMsg)
             callback?.printLog(state, printMsg)
         }
-    }
 
-    interface Callback {
-        fun printLog(state: Int, msg: String)
+        fun cancelDebug(destroy: Boolean = false) {
+            tasks.forEach {
+                if (!it.isCancelled) {
+                    it.cancel()
+                }
+            }
+            tasks.clear()
+
+            if (destroy) {
+                debugSource = null
+                callback = null
+            }
+        }
+
     }
 
     init {
+        debugSource = webBook.sourceUrl
         SourceDebug.callback = callback
     }
 
+    fun startDebug(key: String) {
+        cancelDebug()
+        with(webBook) {
+            if (key.isAbsUrl()) {
+                val book = Book()
+                book.origin = sourceUrl
+                book.bookUrl = key
+                printLog(sourceUrl, 1, "开始访问$key")
+                infoDebug(book)
+            } else {
+                printLog(sourceUrl, 1, "开始搜索关键字$key")
+                searchDebug(key)
+            }
+        }
+    }
+
     fun searchDebug(key: String) {
-        webBook.searchBook(key, 1)
+        val search = webBook.searchBook(key, 1)
             .onSuccess { searchBooks ->
                 searchBooks?.let {
                     if (searchBooks.isNotEmpty()) {
@@ -51,20 +82,22 @@ class SourceDebug(private val webBook: WebBook, callback: Callback) {
             .onError {
                 printLog(debugSource, -1, it.localizedMessage)
             }
+        tasks.add(search)
     }
 
     fun infoDebug(book: Book) {
-        webBook.getBookInfo(book)
+        val info = webBook.getBookInfo(book)
             .onSuccess {
                 tocDebug(book)
             }
             .onError {
                 printLog(debugSource, -1, it.localizedMessage)
             }
+        tasks.add(info)
     }
 
     private fun tocDebug(book: Book) {
-        webBook.getChapterList(book)
+        val chapterList = webBook.getChapterList(book)
             .onSuccess { chapterList ->
                 chapterList?.let {
                     if (it.isNotEmpty()) {
@@ -75,10 +108,11 @@ class SourceDebug(private val webBook: WebBook, callback: Callback) {
             .onError {
                 printLog(debugSource, -1, it.localizedMessage)
             }
+        tasks.add(chapterList)
     }
 
     private fun contentDebug(book: Book, bookChapter: BookChapter) {
-        webBook.getContent(book, bookChapter)
+        val content = webBook.getContent(book, bookChapter)
             .onSuccess { content ->
                 content?.let {
                     printLog(debugSource, 1000, it)
@@ -87,6 +121,11 @@ class SourceDebug(private val webBook: WebBook, callback: Callback) {
             .onError {
                 printLog(debugSource, -1, it.localizedMessage)
             }
+        tasks.add(content)
+    }
+
+    interface Callback {
+        fun printLog(state: Int, msg: String)
     }
 
     fun printLog(
diff --git a/app/src/main/java/io/legado/app/ui/search/SearchViewModel.kt b/app/src/main/java/io/legado/app/ui/search/SearchViewModel.kt
index 3252e5112..d3dddb787 100644
--- a/app/src/main/java/io/legado/app/ui/search/SearchViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/search/SearchViewModel.kt
@@ -10,6 +10,8 @@ import io.legado.app.data.entities.SearchBook
 import io.legado.app.help.http.HttpHelper
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.channels.Channel
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 
 class SearchViewModel(application: Application) : BaseViewModel(application) {
@@ -19,86 +21,68 @@ class SearchViewModel(application: Application) : BaseViewModel(application) {
     private val channel = Channel<Int>()//协程之间通信
 
     fun search(start: (() -> Unit)? = null, finally: (() -> Unit)? = null) {
-//        launch {
-//            repeat(1000) {
-//                channel.send(it)
-//            }
-//        }
-//
-//
-//        val c = execute {
-//
-//            Log.e("TAG1", "start")
-//
-//            val response: String = HttpHelper.getApiService<CommonHttpApi>(
-//                "http://www.baidu.com"
-//            ).get("http://www.baidu.com").await()
-//
-//            Log.e("TAG1", "result: $response")
-//
-//            delay(2000L)
-//
-//            response
-//        }
-//            .onStart {
-//                Log.e("TAG!", "start")
-//                start?.let { it() }
-//            }
+        launch {
+            repeat(1000) {
+                channel.send(it)
+            }
+        }
+
+
+        val c = execute {
+
+            val response: String = HttpHelper.getApiService<CommonHttpApi>(
+                "http://www.baidu.com"
+            ).get("http://www.baidu.com").await()
+
+            delay(2000L)
+
+            response
+        }
+            .onStart {
+                Log.e("TAG!", "start")
+                start?.let { it() }
+            }
+            .onSuccess {
+                Log.e("TAG!", "success: $it")
+            }
+            .onError {
+                Log.e("TAG!", "error: $it")
+            }
+            .onFinally {
+                Log.e("TAG!", "finally")
+                if (finally != null) {
+                    finally()
+                }
+            }
+
+        val c2 = plus(c)
+//            .timeout { 100L }
+//            .onErrorReturn { "error return2" }
+            .onStart {
+                //会拦截掉c的onStart
+                Log.e("TAG!", "start2")
+                start?.let { it() }
+            }
 //            .onSuccess {
-//                Log.e("TAG!", "success: $it")
-//            }
-//            .onError {
-//                Log.e("TAG!", "error: $it")
-//            }
-//            .onFinally {
-//                Log.e("TAG!", "finally")
-//                if (finally != null) {
-//                    finally()
-//                }
-//            }
-//
-//        val c2 = plus(c)
-////            .timeout { 100L }
-////            .onErrorReturn { "error return2" }
-//            .onStart {
-//                //会拦截掉c的onStart
-//                Log.e("TAG!", "start2")
-//                start?.let { it() }
-//            }
-////            .onSuccess {
-////                Log.e("TAG!", "success2: $it")
-////            }
-//            .onError {
-//                Log.e("TAG!", "error2: $it")
+//                Log.e("TAG!", "success2: $it")
 //            }
-//            .onFinally {
-//                Log.e("TAG!", "finally2")
-//                if (finally != null) {
-//                    finally()
-//                }
-//
-//                Log.e("TAG!", "rec2: " + channel.receive())
-//            }
-//
-//        launch {
-//            delay(1500L)
-////            c2.cancel()
-//
-////            c.cancel()
-//        }
-//
-//
-//        launch {
-//            val list = test()
-//            println("size: ${list.size}   $list")
-//        }
+            .onError {
+                Log.e("TAG!", "error2: $it")
+            }
+            .onFinally {
+                Log.e("TAG!", "finally2")
+                if (finally != null) {
+                    finally()
+                }
 
+                Log.e("TAG!", "rec2: " + channel.receive())
+            }
 
-        execute {
-            test(this)
-        }.onSuccess {
-            println("size: ${it?.size}   $it")
-        }
+//        execute {
+//            test(this)
+//        }.onSuccess {
+//            println("size: ${it?.size}   $it")
+//        }
     }
 
     suspend fun test(scope: CoroutineScope): MutableList<String> {
diff --git a/app/src/main/java/io/legado/app/ui/sourcedebug/SourceDebugActivity.kt b/app/src/main/java/io/legado/app/ui/sourcedebug/SourceDebugActivity.kt
index 3de2e2fd0..400328f1f 100644
--- a/app/src/main/java/io/legado/app/ui/sourcedebug/SourceDebugActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/sourcedebug/SourceDebugActivity.kt
@@ -7,10 +7,8 @@ import androidx.lifecycle.Observer
 import androidx.recyclerview.widget.LinearLayoutManager
 import io.legado.app.R
 import io.legado.app.base.BaseActivity
-import io.legado.app.data.entities.BookSource
 import io.legado.app.lib.theme.ATH
 import io.legado.app.lib.theme.ThemeStore
-import io.legado.app.model.webbook.SourceDebug
 import io.legado.app.utils.getViewModel
 import kotlinx.android.synthetic.main.activity_source_debug.*
 import kotlinx.android.synthetic.main.view_title_bar.*
@@ -71,9 +69,4 @@ class SourceDebugActivity : BaseActivity<SourceDebugModel>() {
             toast("未获取到书源")
         })
     }
-
-    override fun onDestroy() {
-        SourceDebug.debugSource = null
-        super.onDestroy()
-    }
 }
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/ui/sourcedebug/SourceDebugModel.kt b/app/src/main/java/io/legado/app/ui/sourcedebug/SourceDebugModel.kt
index e7a9c920f..0a9732ad5 100644
--- a/app/src/main/java/io/legado/app/ui/sourcedebug/SourceDebugModel.kt
+++ b/app/src/main/java/io/legado/app/ui/sourcedebug/SourceDebugModel.kt
@@ -4,48 +4,39 @@ import android.app.Application
 import androidx.lifecycle.MutableLiveData
 import io.legado.app.App
 import io.legado.app.base.BaseViewModel
-import io.legado.app.data.entities.Book
-import io.legado.app.data.entities.BookSource
 import io.legado.app.help.EventMessage
 import io.legado.app.model.WebBook
 import io.legado.app.model.webbook.SourceDebug
-import io.legado.app.utils.isAbsUrl
 
 class SourceDebugModel(application: Application) : BaseViewModel(application), SourceDebug.Callback {
 
     val logs: MutableLiveData<EventMessage> = MutableLiveData()
 
-    private var bookSource: BookSource? = null
+    private var webBook: WebBook? = null
 
     fun init(sourceUrl: String?) {
         sourceUrl?.let {
             //优先使用这个，不会抛出异常
             execute {
-                bookSource = App.db.bookSourceDao().findByKey(sourceUrl)
+                val bookSource = App.db.bookSourceDao().findByKey(sourceUrl)
+                bookSource?.let { webBook = WebBook(it) }
             }
         }
     }
 
     fun startDebug(key: String, start: (() -> Unit)? = null, error: (() -> Unit)? = null) {
-        bookSource?.let {
-            start?.let { it() }
-            SourceDebug.debugSource = it.bookSourceUrl
-            if (key.isAbsUrl()) {
-                val book = Book()
-                book.origin = it.bookSourceUrl
-                book.bookUrl = key
-                SourceDebug(WebBook(it), this)
-                    .printLog(it.bookSourceUrl, 1, "开始访问$key")
-                    .infoDebug(book)
-            } else {
-                SourceDebug(WebBook(it), this)
-                    .printLog(it.bookSourceUrl, 1, "开始搜索关键字$key")
-                    .searchDebug(key)
-            }
-        } ?: error?.let { it() }
+        webBook?.let {
+            start?.invoke()
+            SourceDebug(it, this).startDebug(key)
+        } ?: error?.invoke()
     }
 
     override fun printLog(state: Int, msg: String) {
         logs.postValue(EventMessage.obtain(state, msg))
     }
+
+    override fun onCleared() {
+        super.onCleared()
+        SourceDebug.cancelDebug(true)
+    }
 }