优化

app/src/main/java/io/legado/app/constant/PreferKey.kt

@@ -138,6 +138,7 @@ object PreferKey {
     const val defaultHomePage = "defaultHomePage"
     const val showBookshelfFastScroller = "showBookshelfFastScroller"
     const val importKeepEnable = "importKeepEnable"
+    const val previewImageByClick = "previewImageByClick"
 
     const val cPrimary = "colorPrimary"
     const val cAccent = "colorAccent"

app/src/main/java/io/legado/app/help/config/AppConfig.kt

@@ -426,6 +426,12 @@ object AppConfig : SharedPreferences.OnSharedPreferenceChangeListener {
             appCtx.putPrefBoolean(PreferKey.importKeepEnable, value)
         }
 
+    var previewImageByClick: Boolean
+        get() = appCtx.getPrefBoolean(PreferKey.previewImageByClick, false)
+        set(value) {
+            appCtx.putPrefBoolean(PreferKey.previewImageByClick, value)
+        }
+
     var preDownloadNum
         get() = appCtx.getPrefInt(PreferKey.preDownloadNum, 10)
         set(value) {

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

@@ -24,6 +24,7 @@ import io.legado.app.ui.book.read.page.entities.TextPos
 import io.legado.app.ui.book.read.page.entities.column.*
 import io.legado.app.ui.book.read.page.provider.ChapterProvider
 import io.legado.app.ui.book.read.page.provider.TextPageFactory
+import io.legado.app.ui.widget.dialog.PhotoDialog
 import io.legado.app.utils.*
 import kotlin.math.min
 
@@ -348,6 +349,11 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
                     context.toastOnUi("Button Pressed!")
                     handled = true
                 }
+
+                is ImageColumn -> if (AppConfig.previewImageByClick) {
+                    activity?.showDialogFragment(PhotoDialog(column.src))
+                    handled = true
+                }
             }
         }
         return handled