修改调音器音叉按钮点击效果

musictuner/src/main/res/drawable/selector_music_fork.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="@drawable/icon_music_fork_select" android:state_focused="true" />
+    <item android:drawable="@drawable/icon_music_fork_select" android:state_pressed="true"/>
+    <item android:drawable="@drawable/icon_music_fork_normal" />
+</selector>

musictuner/src/main/res/layout/activity_music_tuner_layout.xml

@@ -319,7 +319,7 @@
                 android:id="@+id/iv_left_bg"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
-                android:src="@drawable/bg_tuning_fork"
+                android:src="@drawable/selector_music_fork"
                 app:layout_constraintHorizontal_chainStyle="packed"
                 app:layout_constraintLeft_toLeftOf="parent"
                 app:layout_constraintRight_toLeftOf="@+id/iv_right_bg"
@@ -336,6 +336,7 @@
                 app:layout_constraintTop_toTopOf="@+id/iv_left_bg" />
 
             <ImageView
+                android:visibility="gone"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:src="@drawable/icon_tuning_fork"