feat: 优化代码

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

@@ -67,6 +67,8 @@ class DownloadService : BaseService() {
         tasks.clear()
         searchPool.close()
         handler.removeCallbacks(runnable)
+        downloadMap.clear()
+        finalMap.clear()
         super.onDestroy()
         postEvent(EventBus.UP_DOWNLOAD, downloadMap)
     }

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

@@ -1,11 +1,13 @@
 package io.legado.app.ui.download
 
 import android.content.Context
+import android.widget.ImageView
 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 io.legado.app.service.help.Download
 import kotlinx.android.synthetic.main.item_download.view.*
 import org.jetbrains.anko.sdk27.listeners.onClick
 import org.jetbrains.anko.toast
@@ -29,16 +31,24 @@ class DownloadAdapter(context: Context, private val callBack: CallBack) :
                     tv_download.text =
                         context.getString(R.string.download_count, cs.size, item.totalChapterNum)
                 }
+                upDownloadIv(iv_download, item)
             } else {
                 val cacheSize = cacheChapters[item.bookUrl]?.size ?: 0
                 tv_download.text =
                     context.getString(R.string.download_count, cacheSize, item.totalChapterNum)
+                upDownloadIv(iv_download, item)
             }
         }
     }
 
     override fun registerListener(holder: ItemViewHolder) {
-        holder.itemView.tv_export.onClick {
+        holder.itemView.apply {
+            iv_download.onClick {
+                getItem(holder.layoutPosition)?.let {
+                    Download.start(context, it.bookUrl, 0, it.totalChapterNum)
+                }
+            }
+            tv_export.onClick {
                 getItem(holder.layoutPosition)?.let {
                     val cacheSize = cacheChapters[it.bookUrl]?.size ?: 0
                     if (cacheSize < it.totalChapterNum) {
@@ -49,6 +59,19 @@ class DownloadAdapter(context: Context, private val callBack: CallBack) :
                 }
             }
         }
+    }
+
+    private fun upDownloadIv(iv: ImageView, book: Book) {
+        downloadMap?.let {
+            if (it.containsKey(book.bookUrl)) {
+                iv.setImageResource(R.drawable.ic_stop_black_24dp)
+            } else {
+                iv.setImageResource(R.drawable.ic_play_24dp)
+            }
+        } ?: let {
+            iv.setImageResource(R.drawable.ic_play_24dp)
+        }
+    }
 
     interface CallBack {
         fun export(position: Int)

app/src/main/res/layout/item_download.xml

@@ -10,7 +10,7 @@
         android:layout_width="0dp"
         android:layout_height="wrap_content"
         android:singleLine="true"
-        app:layout_constraintRight_toLeftOf="@+id/tv_export"
+        app:layout_constraintRight_toLeftOf="@+id/iv_download"
         app:layout_constraintTop_toTopOf="parent"
         app:layout_constraintLeft_toLeftOf="parent" />
 
@@ -19,7 +19,7 @@
         android:layout_width="0dp"
         android:layout_height="wrap_content"
         android:singleLine="true"
-        app:layout_constraintRight_toLeftOf="@+id/tv_export"
+        app:layout_constraintRight_toLeftOf="@+id/iv_download"
         app:layout_constraintTop_toBottomOf="@+id/tv_name"
         app:layout_constraintLeft_toLeftOf="parent" />
 
@@ -28,10 +28,23 @@
         android:layout_width="0dp"
         android:layout_height="wrap_content"
         android:singleLine="true"
-        app:layout_constraintRight_toLeftOf="@+id/tv_export"
+        app:layout_constraintRight_toLeftOf="@+id/iv_download"
         app:layout_constraintTop_toBottomOf="@id/tv_author"
         app:layout_constraintLeft_toLeftOf="parent" />
 
+    <ImageView
+        android:id="@+id/iv_download"
+        android:layout_width="36dp"
+        android:layout_height="36dp"
+        android:padding="6dp"
+        android:background="?attr/selectableItemBackgroundBorderless"
+        android:tint="@color/tv_text_default"
+        android:src="@drawable/ic_play_24dp"
+        android:contentDescription="@string/start"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintRight_toLeftOf="@+id/tv_export" />
+
     <TextView
         android:id="@+id/tv_export"
         android:layout_width="wrap_content"