圆形背景图标 （button），点击变色，简单实现

如图 实现右侧上传button，点击整体变色

Screenshot_20191211-165118_FileManager.jpg

核心代码

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

    <item android:state_pressed="true">
        <layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
            <item>
                <shape xmlns:android="http://schemas.android.com/apk/res/android"
                    android:shape="oval"
                    android:useLevel="false">
                    <solid android:color="#26000000" />
                    />
                </shape>
            </item>
            <item android:drawable="@drawable/cloud_upload_pressed" />
        </layer-list>
    </item>

    <item android:state_pressed="false">
        <layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
            <item>
                <shape xmlns:android="http://schemas.android.com/apk/res/android"
                    android:shape="oval"
                    android:useLevel="false">
                    <solid android:color="#8d000000" />
                    />
                </shape>
            </item>
            <item android:drawable="@drawable/cloud_upload" />
        </layer-list>
    </item>
</selector>

使用简单

<TextView
        android:id="@+id/videoUpload"
        android:layout_width="50dp"
        android:layout_height="50dp"
        ..........
        android:background="@drawable/upload_bg"
        android:clickable="true" 
        android:onClick="uploadTo..."/>

注意点：
透明背景图片，图片应留有一定padding

shape

<?xml version="1.0" encoding="utf-8"?>
<shape
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape=["rectangle" | "oval" | "line" | "ring"] >
    <corners
        android:radius="integer"
        android:topLeftRadius="integer"
        android:topRightRadius="integer"
        android:bottomLeftRadius="integer"
        android:bottomRightRadius="integer" />
    <gradient
        android:angle="integer"
        android:centerX="integer"
        android:centerY="integer"
        android:centerColor="integer"
        android:endColor="color"
        android:gradientRadius="integer"
        android:startColor="color"
        android:type=["linear" | "radial" | "sweep"]
        android:useLevel=["true" | "false"] />
    <padding
        android:left="integer"
        android:top="integer"
        android:right="integer"
        android:bottom="integer" />
    <size
        android:width="integer"
        android:height="integer" />
    <solid
        android:color="color" />
    <stroke
        android:width="integer"
        android:color="color"
        android:dashWidth="integer"
        android:dashGap="integer" />
</shape>