根據圖片從上到下，依次介紹其drawable佈局程式碼！

1.矩形按鈕，點選會變色

名為selector_drawable：

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- 獲取焦點狀態 -->
    <item android:state_focused="true"
        android:drawable="@color/colorBule"/>
 


    <!-- 按下狀態 -->
    <item android:state_pressed="true"
        android:drawable="@color/colorPrimary"/>

    <!-- 預設狀態下 -->
    <item android:drawable="@color/colorGray"/>
</selector>

2.圓角按鈕，點選會變色

名為selector_drawable_for_btn：

<?xml version="1.0" encoding="utf-8"?>
 

<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:state_pressed="true">
        <shape android:shape="rectangle">
            <!-- solid內部填充的顏色-->
            <solid android:color="@color/colorGreen"/>
            <!-- stroke虛線 color虛線顏色  dashGap每段線的間隔寬度 dashWidth每段線的長度 width每段線的高度-->
 

            <stroke android:color="@color/colorPink"
                android:dashGap="15dp"
                android:dashWidth="30dp"
                android:width="5dp"/>
            <corners android:topRightRadius="0dp"
                android:topLeftRadius="60dp"
                android:bottomLeftRadius="90dp"
                android:bottomRightRadius="150dp" />
        </shape>
    </item>

    <item android:state_pressed="false">
        <shape android:shape="rectangle">
            <solid android:color="@color/colorGray"/>
            <corners android:radius="8dp"/>
        </shape>
    </item>

</selector>

3.整體使用

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:gravity="center"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:padding="25dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="selector_state"
        android:textColor="@color/colorWhite"
        android:background="@drawable/selector_drawable"/>

    <Button
        android:layout_marginTop="10dp"
        android:padding="25dp"
        android:text="selector_state"
        android:textColor="@color/colorWhite"
        android:background="@drawable/selector_drawable_for_btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</LinearLayout>