feat: 优化代码

app/src/main/AndroidManifest.xml

@@ -50,7 +50,7 @@
                 android:resource="@xml/shortcuts"
                 android:launchMode="singleTask" />
         </activity>
-        <!--图标1-->
+        <!--图标2-->
         <activity
             android:name=".ui.welcome.Launcher2"
             android:icon="@mipmap/launcher2"
@@ -64,6 +64,20 @@
                 android:resource="@xml/shortcuts"
                 android:launchMode="singleTask" />
         </activity>
+        <!--图标3-->
+        <activity
+            android:name=".ui.welcome.Launcher3"
+            android:icon="@mipmap/launcher3"
+            android:enabled="false">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+            <meta-data
+                android:name="android.app.shortcuts"
+                android:resource="@xml/shortcuts"
+                android:launchMode="singleTask" />
+        </activity>
         <!--主界面-->
         <activity
             android:name=".ui.main.MainActivity"

app/src/main/java/io/legado/app/help/LauncherIconHelp.kt

@@ -7,6 +7,7 @@ import io.legado.app.App
 import io.legado.app.R
 import io.legado.app.ui.welcome.Launcher1
 import io.legado.app.ui.welcome.Launcher2
+import io.legado.app.ui.welcome.Launcher3
 import io.legado.app.ui.welcome.WelcomeActivity
 import org.jetbrains.anko.toast
 
@@ -18,7 +19,8 @@ object LauncherIconHelp {
     private val packageManager: PackageManager = App.INSTANCE.packageManager
     private val componentNames = arrayListOf(
         ComponentName(App.INSTANCE, Launcher1::class.java.name),
-        ComponentName(App.INSTANCE, Launcher2::class.java.name)
+        ComponentName(App.INSTANCE, Launcher2::class.java.name),
+        ComponentName(App.INSTANCE, Launcher3::class.java.name)
     )
 
     fun changeIcon(icon: String?) {

app/src/main/java/io/legado/app/ui/welcome/WelcomeActivity.kt

@@ -50,3 +50,4 @@ open class WelcomeActivity : BaseActivity(R.layout.activity_welcome) {
 
 class Launcher1 : WelcomeActivity()
 class Launcher2 : WelcomeActivity()
+class Launcher3 : WelcomeActivity()

app/src/main/res/mipmap-anydpi-v26/launcher3.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/md_grey_100" />
+    <foreground android:drawable="@drawable/ic_launcher_3" />
+</adaptive-icon>

app/src/main/res/values/arrays.xml

@@ -136,12 +136,14 @@
         <item>iconMain</item>
         <item>icon1</item>
         <item>icon2</item>
+        <item>icon3</item>
     </string-array>
 
     <string-array name="icons">
         <item>ic_launcher</item>
         <item>launcher1</item>
         <item>launcher2</item>
+        <item>launcher3</item>
     </string-array>
 
     <string-array name="chinese_mode">