优化图片下载

app/src/main/java/io/legado/app/help/BookHelp.kt

@@ -13,16 +13,19 @@ import io.legado.app.model.localBook.LocalBook
 import io.legado.app.utils.*
 import kotlinx.coroutines.Dispatchers.IO
 import kotlinx.coroutines.Dispatchers.Main
+import kotlinx.coroutines.delay
 import kotlinx.coroutines.withContext
 import org.apache.commons.text.similarity.JaccardSimilarity
 import org.jetbrains.anko.toast
 import java.io.File
+import java.util.concurrent.CopyOnWriteArraySet
 import kotlin.math.min
 
 object BookHelp {
     private const val cacheFolderName = "book_cache"
     private const val cacheImageFolderName = "images"
     private val downloadDir: File = App.INSTANCE.externalFilesDir
+    private val downloadImages = CopyOnWriteArraySet<String>()
 
     fun formatChapterName(bookChapter: BookChapter): String {
         return String.format(
@@ -61,7 +64,7 @@ object BookHelp {
         }
     }
 
-    fun saveContent(book: Book, bookChapter: BookChapter, content: String) {
+    suspend fun saveContent(book: Book, bookChapter: BookChapter, content: String) {
         if (content.isEmpty()) return
         //保存文本
         FileUtils.createFileIfNotExist(
@@ -84,7 +87,14 @@ object BookHelp {
         postEvent(EventBus.SAVE_CONTENT, bookChapter)
     }
 
-    fun saveImage(book: Book, src: String) {
+    suspend fun saveImage(book: Book, src: String) {
+        while (downloadImages.contains(src)) {
+            delay(100)
+        }
+        if (getImage(book, src).exists()) {
+            return
+        }
+        downloadImages.add(src)
         val analyzeUrl = AnalyzeUrl(src)
         analyzeUrl.getImageBytes(book.origin)?.let {
             FileUtils.createFileIfNotExist(
@@ -95,6 +105,7 @@ object BookHelp {
                 "${MD5Utils.md5Encode16(src)}${getImageSuffix(src)}"
             ).writeBytes(it)
         }
+        downloadImages.remove(src)
     }
 
     fun getImage(book: Book, src: String): File {

app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt

@@ -55,6 +55,7 @@ import io.legado.app.ui.widget.dialog.TextDialog
 import io.legado.app.utils.*
 import kotlinx.android.synthetic.main.activity_book_read.*
 import kotlinx.android.synthetic.main.view_read_menu.*
+import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers.IO
 import kotlinx.coroutines.launch
 import org.jetbrains.anko.sdk27.listeners.onClick
@@ -84,6 +85,7 @@ class ReadBookActivity : VMBaseActivity<ReadBookViewModel>(R.layout.activity_boo
     override val viewModel: ReadBookViewModel
         get() = getViewModel(ReadBookViewModel::class.java)
 
+    override val scope: CoroutineScope get() = this
     override val isInitFinish: Boolean get() = viewModel.isInitFinish
 
     private val mHandler = Handler()

app/src/main/java/io/legado/app/ui/book/read/page/ContentTextView.kt

@@ -20,6 +20,7 @@ import io.legado.app.ui.widget.dialog.PhotoDialog
 import io.legado.app.utils.activity
 import io.legado.app.utils.getCompatColor
 import io.legado.app.utils.getPrefBoolean
+import kotlinx.coroutines.CoroutineScope
 
 
 class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, attrs) {
@@ -105,7 +106,7 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
     private fun draw(
         canvas: Canvas,
         textLine: TextLine,
-        relativeOffset: Float
+        relativeOffset: Float,
     ) {
         val lineTop = textLine.lineTop + relativeOffset
         val lineBase = textLine.lineBase + relativeOffset
@@ -135,7 +136,7 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
         lineBase: Float,
         lineBottom: Float,
         isTitle: Boolean,
-        isReadAloud: Boolean
+        isReadAloud: Boolean,
     ) {
         val textPaint = if (isTitle) ChapterProvider.titlePaint else ChapterProvider.contentPaint
         textPaint.color =
@@ -155,16 +156,14 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
         canvas: Canvas,
         textLine: TextLine,
         lineTop: Float,
-        lineBottom: Float
+        lineBottom: Float,
     ) {
         textLine.textChars.forEach { textChar ->
             val rectF = RectF(textChar.start, lineTop, textChar.end, lineBottom)
-            ImageProvider.getImage(
-                ReadBook.book!!,
+            ImageProvider.getImage(ReadBook.book!!,
                 textPage.chapterIndex,
                 textChar.charData,
-                true
-            )?.let {
+                true)?.let {
                 canvas.drawBitmap(it, null, rectF, null)
             }
         }
@@ -211,7 +210,7 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
     fun selectText(
         x: Float,
         y: Float,
-        select: (relativePage: Int, lineIndex: Int, charIndex: Int) -> Unit
+        select: (relativePage: Int, lineIndex: Int, charIndex: Int) -> Unit,
     ) {
         if (!selectAble) return
         if (!visibleRect.contains(x, y)) return
@@ -257,7 +256,7 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
         lineIndex: Int,
         charIndex: Int,
         relativeOffset: Float,
-        select: (relativePage: Int, lineIndex: Int, charIndex: Int) -> Unit
+        select: (relativePage: Int, lineIndex: Int, charIndex: Int) -> Unit,
     ) {
         if (textChar.isImage) {
             activity?.supportFragmentManager?.let {
@@ -613,5 +612,6 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
         fun onCancelSelect()
         val headerHeight: Int
         val pageFactory: TextPageFactory
+        val scope: CoroutineScope
     }
 }

app/src/main/java/io/legado/app/ui/book/read/page/provider/ChapterProvider.kt

@@ -45,12 +45,12 @@ object ChapterProvider {
     /**
      * 获取拆分完的章节数据
      */
-    fun getTextChapter(
+    suspend fun getTextChapter(
         book: Book,
         bookChapter: BookChapter,
         contents: List<String>,
         chapterSize: Int,
-        imageStyle: String?
+        imageStyle: String?,
     ): TextChapter {
         val textPages = arrayListOf<TextPage>()
         val pageLines = arrayListOf<Int>()
@@ -110,13 +110,13 @@ object ChapterProvider {
         )
     }
 
-    private fun setTypeImage(
+    private suspend fun setTypeImage(
         book: Book,
         chapter: BookChapter,
         src: String,
         y: Float,
         textPages: ArrayList<TextPage>,
-        imageStyle: String?
+        imageStyle: String?,
     ): Float {
         var durY = y
         ImageProvider.getImage(book, chapter.index, src)?.let {

app/src/main/java/io/legado/app/ui/book/read/page/provider/ImageProvider.kt

@@ -1,13 +1,12 @@
 package io.legado.app.ui.book.read.page.provider
 
 import android.graphics.Bitmap
-import io.legado.app.App
 import io.legado.app.data.entities.Book
 import io.legado.app.help.BookHelp
 import io.legado.app.model.localBook.EPUBFile
 import io.legado.app.utils.BitmapUtils
 import io.legado.app.utils.FileUtils
-import io.legado.app.utils.externalFilesDir
+import kotlinx.coroutines.runBlocking
 import java.io.FileOutputStream
 import java.util.concurrent.ConcurrentHashMap
 
@@ -37,14 +36,16 @@ object ImageProvider {
         val vFile = BookHelp.getImage(book, src)
         if (!vFile.exists()) {
             if (book.isEpub()) {
-                EPUBFile.getImage(book, src).use {
-                    val out = FileOutputStream(FileUtils.createFileIfNotExist(vFile.absolutePath))
-                    it?.copyTo(out)
-                    out.flush()
-                    out.close()
+                EPUBFile.getImage(book, src)?.use { input ->
+                    val newFile = FileUtils.createFileIfNotExist(vFile.absolutePath)
+                    FileOutputStream(newFile).use { output ->
+                        input.copyTo(output)
+                    }
                 }
             } else if (!onUi) {
-                BookHelp.saveImage(book, src)
+                runBlocking {
+                    BookHelp.saveImage(book, src)
+                }
             }
         }
         return try {

app/src/main/java/io/legado/app/ui/widget/dialog/PhotoDialog.kt

@@ -20,7 +20,7 @@ class PhotoDialog : BaseDialogFragment() {
         fun show(
             fragmentManager: FragmentManager,
             chapterIndex: Int,
-            src: String
+            src: String,
         ) {
             PhotoDialog().apply {
                 val bundle = Bundle()
@@ -45,7 +45,7 @@ class PhotoDialog : BaseDialogFragment() {
     override fun onCreateView(
         inflater: LayoutInflater,
         container: ViewGroup?,
-        savedInstanceState: Bundle?
+        savedInstanceState: Bundle?,
     ): View? {
         return inflater.inflate(R.layout.dialog_photo_view, container)
     }
@@ -56,8 +56,12 @@ class PhotoDialog : BaseDialogFragment() {
             val src = it.getString("src")
             ReadBook.book?.let { book ->
                 src?.let {
-                    ImageProvider.getImage(book, chapterIndex, src)?.let { bitmap ->
-                        photo_view.setImageBitmap(bitmap)
+                    execute {
+                        ImageProvider.getImage(book, chapterIndex, src)
+                    }.onSuccess { bitmap ->
+                        if (bitmap != null) {
+                            photo_view.setImageBitmap(bitmap)
+                        }
                     }
                 }
             }