feat: 优化代码

app/src/main/java/io/legado/app/ui/widget/LabelsBar.kt

@@ -3,15 +3,18 @@ package io.legado.app.ui.widget
 import android.content.Context
 import android.util.AttributeSet
 import android.widget.LinearLayout
+import android.widget.TextView
 import io.legado.app.ui.widget.text.AccentBgTextView
 import io.legado.app.utils.dp
 
 
 class LabelsBar(context: Context, attrs: AttributeSet?) : LinearLayout(context, attrs) {
 
+    private val unUsedViews = arrayListOf<TextView>()
+    private val usedViews = arrayListOf<TextView>()
 
     fun setLabels(labels: Array<String>) {
-        removeAllViews()
+        clear()
         labels.forEach {
             addLabel(it)
         }
@@ -25,18 +28,30 @@ class LabelsBar(context: Context, attrs: AttributeSet?) : LinearLayout(context,
     }
 
     fun clear() {
+        unUsedViews.addAll(usedViews)
+        usedViews.clear()
         removeAllViews()
     }
 
     fun addLabel(label: String) {
-        addView(AccentBgTextView(context, null).apply {
+        val tv = if (unUsedViews.isEmpty()) {
+            AccentBgTextView(context, null).apply {
                 setPadding(3.dp, 0, 3.dp, 0)
                 setRadios(2)
                 val lp = LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)
                 lp.setMargins(0, 0, 2.dp, 0)
                 layoutParams = lp
                 text = label
-        })
+                usedViews.add(this)
+            }
+        } else {
+            unUsedViews.last().apply {
+                usedViews.add(this)
+                unUsedViews.removeAt(unUsedViews.lastIndex)
+            }
+        }
+        tv.text = label
+        addView(tv)
     }
 
 }