feat: 优化代码

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

@@ -29,7 +29,7 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
     private var selectCharStart = 0
     private var selectLineEnd = 0
     private var selectCharEnd = 0
-    private var textPage: TextPage? = null
+    private var textPage: TextPage = TextPage()
     //滚动参数
     private val maxScrollOffset = 100f
     private var pageOffset = 0f
@@ -39,7 +39,7 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
         activityCallBack = activity as CallBack
     }
 
-    fun setContent(textPage: TextPage?) {
+    fun setContent(textPage: TextPage) {
         this.textPage = textPage
         invalidate()
     }
@@ -55,7 +55,6 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
 
     override fun onDraw(canvas: Canvas) {
         super.onDraw(canvas)
-        textPage?.let { textPage ->
         textPage.textLines.forEach { textLine ->
             val textPaint = if (textLine.isTitle) {
                 ChapterProvider.titlePaint
@@ -86,7 +85,6 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
             }
         }
     }
-    }
 
     fun onScroll(mOffset: Float) {
         var offset = mOffset
@@ -105,10 +103,10 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
             pageOffset = 0f
         }
 
+
     }
 
     fun selectText(x: Float, y: Float): Boolean {
-        textPage?.let { textPage ->
         for ((lineIndex, textLine) in textPage.textLines.withIndex()) {
             if (y > textLine.lineTop && y < textLine.lineBottom) {
                 for ((charIndex, textChar) in textLine.textChars.withIndex()) {
@@ -133,12 +131,10 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
                 break
             }
         }
-        }
         return false
     }
 
     fun selectStartMove(x: Float, y: Float) {
-        textPage?.let { textPage ->
         for ((lineIndex, textLine) in textPage.textLines.withIndex()) {
             if (y > textLine.lineTop && y < textLine.lineBottom) {
                 for ((charIndex, textChar) in textLine.textChars.withIndex()) {
@@ -159,10 +155,8 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
             }
         }
     }
-    }
 
     fun selectEndMove(x: Float, y: Float) {
-        textPage?.let { textPage ->
         for ((lineIndex, textLine) in textPage.textLines.withIndex()) {
             if (y > textLine.lineTop && y < textLine.lineBottom) {
                 for ((charIndex, textChar) in textLine.textChars.withIndex()) {
@@ -183,7 +177,6 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
             }
         }
     }
-    }
 
     private fun upSelectChars(textPage: TextPage) {
         for ((lineIndex, textLine) in textPage.textLines.withIndex()) {
@@ -212,38 +205,38 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
     }
 
     fun cancelSelect() {
-        textPage?.let { textPage ->
         textPage.textLines.forEach { textLine ->
             textLine.textChars.forEach {
                 it.selected = false
             }
         }
         invalidate()
-        }
         activityCallBack.onCancelSelect()
     }
 
     val selectedText: String
         get() {
             val stringBuilder = StringBuilder()
-            textPage?.let {
             for (lineIndex in selectLineStart..selectLineEnd) {
                 if (lineIndex == selectLineStart && lineIndex == selectLineEnd) {
                     stringBuilder.append(
-                            it.textLines[lineIndex].text.substring(
+                        textPage.textLines[lineIndex].text.substring(
                             selectCharStart,
                             selectCharEnd + 1
                         )
                     )
                 } else if (lineIndex == selectLineStart) {
-                        stringBuilder.append(it.textLines[lineIndex].text.substring(selectCharStart))
+                    stringBuilder.append(
+                        textPage.textLines[lineIndex].text.substring(
+                            selectCharStart
+                        )
+                    )
                 } else if (lineIndex == selectLineEnd) {
                     stringBuilder.append(
-                            it.textLines[lineIndex].text.substring(0, selectCharEnd + 1)
+                        textPage.textLines[lineIndex].text.substring(0, selectCharEnd + 1)
                     )
                 } else {
-                        stringBuilder.append(it.textLines[lineIndex].text)
-                    }
+                    stringBuilder.append(textPage.textLines[lineIndex].text)
                 }
             }
             return stringBuilder.toString()

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

@@ -93,8 +93,8 @@ class ContentView(context: Context) : FrameLayout(context) {
     }
 
     fun setContent(textPage: TextPage?) {
-        content_text_view.setContent(textPage)
         if (textPage != null) {
+            content_text_view.setContent(textPage)
             tv_bottom_left.text = textPage.title
             pageSize = textPage.pageSize
             setPageIndex(textPage.index)