selector的使用，android:clickable="true"

<ImageView
                    android:id="@+id/patrol_buzzer_btn"
                    android:layout_width="80dp"
                    android:layout_height="80dp"
                    android:src="@drawable/selector_buzzer"
                    android:clickable="true"
                    app:layout_constraintBottom_toTopOf="@+id/patrol_btn"
                    app:layout_constraintLeft_toLeftOf="parent"
                    app:layout_constraintRight_toRightOf="parent"
                    app:layout_constraintTop_toTopOf="parent" />

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@drawable/artillery_buzzer_pressed" android:state_pressed="true" />
    <item android:drawable="@drawable/artillery_buzzer" android:state_pressed="false"/>

</selector>

artillery_buzzer_pressed

artillery_buzzer

原文地址：https://www.cnblogs.com/Oldz/p/10319108.html