feat: 优化代码

app/src/main/java/io/legado/app/ui/rss/read/ReadRssActivity.kt

@@ -22,7 +22,6 @@ import org.apache.commons.text.StringEscapeUtils
 import org.jetbrains.anko.share
 import org.jetbrains.anko.toast
 import org.jsoup.Jsoup
-import org.jsoup.safety.Whitelist
 
 
 class ReadRssActivity : VMBaseActivity<ReadRssViewModel>(R.layout.activity_rss_read),
@@ -253,11 +252,8 @@ class ReadRssActivity : VMBaseActivity<ReadRssViewModel>(R.layout.activity_rss_r
             web_view.settings.javaScriptEnabled = true
             web_view.evaluateJavascript("document.documentElement.outerHTML") {
                 val html = StringEscapeUtils.unescapeJson(it)
-                val text = Jsoup.clean(html, Whitelist.none())
-                    .replace(Regex("""&\w+;"""), "")
-                    .trim()//朗读过程中总是听到一些杂音，清理一下
-                //longToast(需读内容)调试一下
-                viewModel.readAloud(text)
+                Jsoup.parse(html).text()
+                viewModel.readAloud(Jsoup.parse(html).textArray())
             }
         }
     }

app/src/main/java/io/legado/app/ui/rss/read/ReadRssViewModel.kt

@@ -37,7 +37,7 @@ class ReadRssViewModel(application: Application) : BaseViewModel(application),
     var star = false
     var textToSpeech: TextToSpeech? = null
     private var ttsInitFinish = false
-    private var ttsText = ""
+    private var ttsTextList = arrayListOf<String>()
 
     fun initData(intent: Intent) {
         execute {
@@ -163,13 +163,14 @@ class ReadRssViewModel(application: Application) : BaseViewModel(application),
     private fun play() {
         if (!ttsInitFinish) return
         textToSpeech?.stop()
-        ttsText.split("\n", "  ", "　　").forEach {
+        ttsTextList.forEach {
             textToSpeech?.speak(it, TextToSpeech.QUEUE_ADD, null, "rss")
         }
     }
 
-    fun readAloud(text: String) {
-        ttsText = text
+    fun readAloud(textArray: Array<String>) {
+        ttsTextList.clear()
+        ttsTextList.addAll(textArray)
         textToSpeech?.let {
             play()
         } ?: let {

app/src/main/java/io/legado/app/utils/JsoupExtensions.kt

@@ -0,0 +1,69 @@
+package io.legado.app.utils
+
+import org.jsoup.internal.StringUtil
+import org.jsoup.nodes.CDataNode
+import org.jsoup.nodes.Element
+import org.jsoup.nodes.Node
+import org.jsoup.nodes.TextNode
+import org.jsoup.select.NodeTraversor
+import org.jsoup.select.NodeVisitor
+
+
+fun Element.textArray(): Array<String> {
+    val accum = StringUtil.borrowBuilder()
+    NodeTraversor.traverse(object : NodeVisitor {
+        override fun head(node: Node, depth: Int) {
+            if (node is TextNode) {
+                appendNormalisedText(accum, node)
+            } else if (node is Element) {
+                if (accum.isNotEmpty() &&
+                    (node.isBlock || node.tag().name == "br") &&
+                    !lastCharIsWhitespace(accum)
+                ) accum.append("\n")
+            }
+        }
+
+        override fun tail(node: Node, depth: Int) {
+            // make sure there is a space between block tags and immediately following text nodes <div>One</div>Two should be "One Two".
+            if (node is Element) {
+                if (node.isBlock && node.nextSibling() is TextNode && !lastCharIsWhitespace(
+                        accum
+                    )
+                ) accum.append("\n")
+            }
+        }
+    }, this)
+    val text = StringUtil.releaseBuilder(accum).trim { it <= ' ' }
+    return text.splitNotBlank("\n")
+}
+
+private fun appendNormalisedText(
+    accum: StringBuilder,
+    textNode: TextNode
+) {
+    val text = textNode.wholeText
+    if (preserveWhitespace(textNode.parentNode()) || textNode is CDataNode) accum.append(text) else StringUtil.appendNormalisedWhitespace(
+        accum,
+        text,
+        lastCharIsWhitespace(accum)
+    )
+}
+
+private fun preserveWhitespace(node: Node?): Boolean {
+    // looks only at this element and five levels up, to prevent recursion & needless stack searches
+    if (node is Element) {
+        var el = node as Element?
+        var i = 0
+        do {
+            if (el!!.tag().preserveWhitespace()) return true
+            el = el.parent()
+            i++
+        } while (i < 6 && el != null)
+    }
+    return false
+}
+
+private fun lastCharIsWhitespace(sb: java.lang.StringBuilder): Boolean {
+    return sb.isNotEmpty() && sb[sb.length - 1] == ' '
+}
+