feat: 优化代码

app/src/main/java/io/legado/app/service/DownloadService.kt

@@ -68,7 +68,7 @@ class DownloadService : BaseService() {
         searchPool.close()
         handler.removeCallbacks(runnable)
         super.onDestroy()
-        postEvent(EventBus.UP_DOWNLOAD, false)
+        postEvent(EventBus.UP_DOWNLOAD, downloadMap)
     }
 
     private fun addDownloadData(bookUrl: String?, start: Int, end: Int) {
@@ -144,7 +144,7 @@ class DownloadService : BaseService() {
 
     private fun upDownload() {
         updateNotification(notificationContent)
-        postEvent(EventBus.UP_DOWNLOAD, true)
+        postEvent(EventBus.UP_DOWNLOAD, downloadMap)
         handler.removeCallbacks(runnable)
         handler.postDelayed(runnable, 1000)
     }

app/src/main/java/io/legado/app/ui/download/DownloadActivity.kt

@@ -105,15 +105,16 @@ class DownloadActivity : VMBaseActivity<DownloadViewModel>(R.layout.activity_dow
     }
 
     override fun observeLiveBus() {
-        observeEvent<Boolean>(EventBus.UP_DOWNLOAD) {
-            if (it) {
-                menu?.findItem(R.id.menu_download)?.setIcon(R.drawable.ic_stop_black_24dp)
+        observeEvent<HashMap<String, LinkedHashSet<BookChapter>>>(EventBus.UP_DOWNLOAD) {
+            if (it.isEmpty()) {
+                menu?.findItem(R.id.menu_download)?.setIcon(R.drawable.ic_play_24dp)
                 menu?.applyTint(this)
-                adapter.notifyItemRangeChanged(0, adapter.getActualItemCount(), true)
             } else {
-                menu?.findItem(R.id.menu_download)?.setIcon(R.drawable.ic_play_24dp)
+                menu?.findItem(R.id.menu_download)?.setIcon(R.drawable.ic_stop_black_24dp)
                 menu?.applyTint(this)
             }
+            adapter.downloadMap = it
+            adapter.notifyItemRangeChanged(0, adapter.getActualItemCount(), true)
         }
         observeEvent<BookChapter>(EventBus.SAVE_CONTENT) {
             adapter.cacheChapters[it.bookUrl]?.add(it.url)

app/src/main/java/io/legado/app/ui/download/DownloadAdapter.kt

@@ -5,6 +5,7 @@ import io.legado.app.R
 import io.legado.app.base.adapter.ItemViewHolder
 import io.legado.app.base.adapter.SimpleRecyclerAdapter
 import io.legado.app.data.entities.Book
+import io.legado.app.data.entities.BookChapter
 import kotlinx.android.synthetic.main.item_download.view.*
 import org.jetbrains.anko.sdk27.listeners.onClick
 import org.jetbrains.anko.toast
@@ -14,6 +15,7 @@ class DownloadAdapter(context: Context, private val callBack: CallBack) :
     SimpleRecyclerAdapter<Book>(context, R.layout.item_download) {
 
     val cacheChapters = hashMapOf<String, HashSet<String>>()
+    var downloadMap: HashMap<String, LinkedHashSet<BookChapter>>? = null
 
     override fun convert(holder: ItemViewHolder, item: Book, payloads: MutableList<Any>) {
         with(holder.itemView) {