优化

app/src/main/java/io/legado/app/lib/theme/ColorUtils.kt

@@ -3,6 +3,7 @@ package io.legado.app.lib.theme
 import android.graphics.Color
 import androidx.annotation.ColorInt
 import androidx.annotation.FloatRange
+import java.util.*
 
 object ColorUtils {
 
@@ -76,4 +77,82 @@ object ColorUtils {
         return Color.argb(a.toInt(), r.toInt(), g.toInt(), b.toInt())
     }
 
+    /**
+     * 按条件的到随机颜色
+     *
+     * @param alpha 透明
+     * @param lower 下边界
+     * @param upper 上边界
+     * @return 颜色值
+     */
+    fun getRandomColor(alpha: Int, lower: Int, upper: Int): Int {
+        return RandomColor(alpha, lower, upper).color
+    }
+
+    /**
+     * @return 获取随机色
+     */
+    fun getRandomColor(): Int {
+        return RandomColor(255, 80, 200).color
+    }
+
+
+    /**
+     * 随机颜色
+     */
+    class RandomColor(alpha: Int, lower: Int, upper: Int) {
+        internal var alpha: Int = 0
+        internal var lower: Int = 0
+        internal var upper: Int = 0
+
+        //随机数是前闭  后开
+        val color: Int
+            get() {
+                val red = getLower() + Random().nextInt(getUpper() - getLower() + 1)
+                val green = getLower() + Random().nextInt(getUpper() - getLower() + 1)
+                val blue = getLower() + Random().nextInt(getUpper() - getLower() + 1)
+
+                return Color.argb(getAlpha(), red, green, blue)
+            }
+
+        init {
+            if (upper <= lower) {
+                throw IllegalArgumentException("must be lower < upper")
+            }
+            setAlpha(alpha)
+            setLower(lower)
+            setUpper(upper)
+        }
+
+        fun getAlpha(): Int {
+            return alpha
+        }
+
+        fun setAlpha(alpha: Int) {
+            var alpha = alpha
+            if (alpha > 255) alpha = 255
+            if (alpha < 0) alpha = 0
+            this.alpha = alpha
+        }
+
+        fun getLower(): Int {
+            return lower
+        }
+
+        fun setLower(lower: Int) {
+            var lower = lower
+            if (lower < 0) lower = 0
+            this.lower = lower
+        }
+
+        fun getUpper(): Int {
+            return upper
+        }
+
+        fun setUpper(upper: Int) {
+            var upper = upper
+            if (upper > 255) upper = 255
+            this.upper = upper
+        }
+    }
 }

app/src/main/java/io/legado/app/ui/main/findbook/FindBookAdapter.kt

@@ -1,5 +1,6 @@
 package io.legado.app.ui.main.findbook
 
+import android.graphics.drawable.GradientDrawable
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
@@ -8,6 +9,7 @@ import androidx.recyclerview.widget.DiffUtil
 import androidx.recyclerview.widget.RecyclerView
 import io.legado.app.R
 import io.legado.app.data.entities.BookSource
+import io.legado.app.lib.theme.ColorUtils
 import kotlinx.android.synthetic.main.item_find_book.view.*
 
 class FindBookAdapter:PagedListAdapter<BookSource, FindBookAdapter.MyViewHolder>(DIFF_CALLBACK) {
@@ -36,6 +38,8 @@ class FindBookAdapter:PagedListAdapter<BookSource, FindBookAdapter.MyViewHolder>
     class MyViewHolder(view: View) : RecyclerView.ViewHolder(view) {
 
         fun bind(bookSource: BookSource) = with(itemView) {
+            val bgShape: GradientDrawable? = tv_name.background as? GradientDrawable
+            bgShape?.setStroke(1, ColorUtils.getRandomColor())
             tv_name.text = bookSource.name
         }
     }

app/src/main/res/drawable/shape_radius_10dp.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android">
+    <corners android:radius="16dp" />
+    <solid android:color="#00ffffff" />
+    <stroke
+        android:width="3dp"
+        android:color="@color/tv_text_secondary" />
+</shape>

app/src/main/res/layout/item_find_book.xml

@@ -1,8 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
 <TextView xmlns:android="http://schemas.android.com/apk/res/android"
     android:id="@+id/tv_name"
+    android:background="@drawable/shape_radius_10dp"
     android:orientation="vertical"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
-    android:layout_margin="3dp"
+    android:layout_margin="5dp"
+    android:gravity="center"
     android:padding="5dp" />