├── .gitignore
├── LICENSE
├── Readme.md
├── build.gradle
├── consumer-rules.pro
├── proguard-rules.pro
└── src
└── main
├── AndroidManifest.xml
├── java
└── com
│ └── randalldev
│ └── shadowview
│ └── ShadowView.kt
└── res
└── values
├── attrs.xml
└── colors.xml
/.gitignore:
--------------------------------------------------------------------------------
1 | /build
2 | /src/androidTest/
3 | /src/test/
4 |
--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
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/Readme.md:
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1 | # ShadowView
2 |
3 | ## 圆角矩形阴影(Rectangle shape shadow)
4 |
5 | 1. 普通阴影(shadow with no offset)
6 |
7 | ```xml
8 |
9 |
16 |
17 |
32 |
33 |
48 |
49 |
50 | ```
51 |
52 | 
53 |
54 | 抛开配色不谈，这个效果还可以吧
55 |
56 | 2. 普通阴影 + 偏移(shadow with offset)
57 |
58 | ```xml
59 |
60 |
68 | ```
69 |
70 | 
71 |
72 | ## 圆形阴影(Circle shape shadow)
73 |
74 | 圆形阴影也可以认为是一种特殊的圆角矩形阴影，可以继续沿用圆角矩形的方式，或者添加 `shadowShape` 属性。
75 |
76 | 如果要使用圆角矩形的方式，需要事先确定目标控件的尺寸，这可能会遇到屏幕适配问题，所以我这里就直接演示使用 `shadowShape` 属性的方式
77 |
78 | 1. 普通阴影(shadow with no offset)
79 | ```xml
80 |
81 |
87 |
88 |
122 | ```
123 |
124 | 
125 |
126 | > 这个使用起来还是比较方便的吧，只需要目标控件设置 `padding` 留出足够的空间绘制阴影效果即可。
127 | >
128 | >并且不需要再写 `drawable` 文件设置控件的背景了。
129 | >
130 | >当然也不是没有缺陷，目前还是只能兼容圆角矩形和圆形。异形的暂时没用到，可能也不会去做支持。
131 |
132 | ## 参考文章
133 |
134 | [Android进阶：快速实现自定义阴影效果](https://zhuanlan.zhihu.com/p/136440080)
135 |
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/build.gradle:
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1 | plugins {
2 | id 'com.android.library'
3 | id 'org.jetbrains.kotlin.android'
4 | }
5 |
6 | android {
7 | namespace 'com.randalldev.shadowview'
8 | compileSdk 33
9 |
10 | defaultConfig {
11 | minSdk 23
12 | targetSdk 33
13 |
14 | testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
15 | consumerProguardFiles "consumer-rules.pro"
16 | }
17 |
18 | buildTypes {
19 | release {
20 | minifyEnabled false
21 | proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
22 | }
23 | }
24 | compileOptions {
25 | sourceCompatibility JavaVersion.VERSION_1_8
26 | targetCompatibility JavaVersion.VERSION_1_8
27 | }
28 | kotlinOptions {
29 | jvmTarget = '1.8'
30 | }
31 | }
32 |
33 | dependencies {
34 |
35 | implementation 'androidx.core:core-ktx:1.8.0'
36 | }
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/consumer-rules.pro:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/RandallXia/ShadowView/b9370d55585ee820a7a543ecc282f78893197091/consumer-rules.pro
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/proguard-rules.pro:
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1 | # Add project specific ProGuard rules here.
2 | # You can control the set of applied configuration files using the
3 | # proguardFiles setting in build.gradle.
4 | #
5 | # For more details, see
6 | # http://developer.android.com/guide/developing/tools/proguard.html
7 |
8 | # If your project uses WebView with JS, uncomment the following
9 | # and specify the fully qualified class name to the JavaScript interface
10 | # class:
11 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview {
12 | # public *;
13 | #}
14 |
15 | # Uncomment this to preserve the line number information for
16 | # debugging stack traces.
17 | #-keepattributes SourceFile,LineNumberTable
18 |
19 | # If you keep the line number information, uncomment this to
20 | # hide the original source file name.
21 | #-renamesourcefileattribute SourceFile
--------------------------------------------------------------------------------
/src/main/AndroidManifest.xml:
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1 |
2 |
3 |
4 |
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/src/main/java/com/randalldev/shadowview/ShadowView.kt:
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1 | package com.randalldev.shadowview
2 |
3 | import android.content.Context
4 | import android.graphics.Canvas
5 | import android.graphics.Color
6 | import android.graphics.Paint
7 | import android.graphics.RectF
8 | import android.util.AttributeSet
9 | import android.view.View
10 | import android.widget.FrameLayout
11 | import androidx.annotation.ColorInt
12 | import androidx.core.content.ContextCompat
13 |
14 | /**
15 | *
16 | * @author Randall.
17 | * @Date 2023-03-16.
18 | * @Time 11:11.
19 | */
20 | class ShadowView @JvmOverloads constructor(context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0) :
21 | FrameLayout(context, attrs, defStyleAttr) {
22 |
23 | /**
24 | * 阴影的形状
25 | */
26 | private var shadowShape = 0
27 |
28 | /**
29 | * 被绘制阴影的控件的圆角
30 | */
31 | private var shadowRound = 0
32 |
33 | /**
34 | * 阴影的颜色
35 | */
36 | private var shadowColor = 0
37 |
38 | /**
39 | * 被绘制阴影的控件的背景色
40 | */
41 | private var shadowCardColor = 0
42 |
43 | /**
44 | * 阴影的范围，对应设计稿的 Blur 参数
45 | */
46 | private var shadowRadius = 0
47 |
48 | /**
49 | * 阴影的 X 轴位移，对应设计稿 Offset 的 X 参数
50 | */
51 | private var shadowOffsetY = 0
52 |
53 | /**
54 | * 阴影的 Y 轴位移，对应设计稿 Offset 的 Y 参数
55 | */
56 | private var shadowOffsetX = 0
57 |
58 | /**
59 | * 顶部实际可供显示的区域
60 | */
61 | private var shadowTopHeight = 0
62 |
63 | /**
64 | * 左侧实际可供显示的区域
65 | */
66 | private var shadowLeftHeight = 0
67 |
68 | /**
69 | * 右侧实际可供显示的区域
70 | */
71 | private var shadowRightHeight = 0
72 |
73 | /**
74 | * 底部实际可供显示的区域
75 | */
76 | private var shadowBottomHeight = 0
77 |
78 | init {
79 | initView(context, attrs)
80 | //设置软件渲染类型，跟绘制阴影相关，后边会说
81 | setLayerType(View.LAYER_TYPE_SOFTWARE, null)
82 | }
83 |
84 | private fun initView(context: Context, attrs: AttributeSet?) {
85 | val a = context.obtainStyledAttributes(attrs, R.styleable.ShadowView)
86 | shadowShape = a.getInteger(R.styleable.ShadowView_shadowShape, DEFAULT_VALUE_SHADOW_SHAPE)
87 | shadowRound = a.getDimensionPixelSize(R.styleable.ShadowView_shadowRound, DEFAULT_VALUE_SHADOW_ROUND)
88 | shadowColor = a.getColor(
89 | R.styleable.ShadowView_shadowColor, ContextCompat.getColor(
90 | context, DEFAULT_VALUE_SHADOW_COLOR
91 | )
92 | )
93 | shadowCardColor = a.getColor(
94 | R.styleable.ShadowView_shadowCardColor, ContextCompat.getColor(
95 | context, DEFAULT_VALUE_SHADOW_CARD_COLOR
96 | )
97 | )
98 | shadowTopHeight = a.getDimensionPixelSize(
99 | R.styleable.ShadowView_shadowTopHeight, dp2px(
100 | context, DEFAULT_VALUE_SHADOW_TOP_HEIGHT.toFloat()
101 | )
102 | )
103 | shadowRightHeight = a.getDimensionPixelSize(
104 | R.styleable.ShadowView_shadowRightHeight, dp2px(
105 | context, DEFAULT_VALUE_SHADOW_RIGHT_HEIGHT.toFloat()
106 | )
107 | )
108 | shadowLeftHeight = a.getDimensionPixelSize(
109 | R.styleable.ShadowView_shadowLeftHeight, dp2px(
110 | context, DEFAULT_VALUE_SHADOW_LEFT_HEIGHT.toFloat()
111 | )
112 | )
113 | shadowBottomHeight = a.getDimensionPixelSize(
114 | R.styleable.ShadowView_shadowBottomHeight, dp2px(
115 | context, DEFAULT_VALUE_SHADOW_BOTTOM_HEIGHT.toFloat()
116 | )
117 | )
118 | shadowOffsetX = a.getDimensionPixelSize(
119 | R.styleable.ShadowView_shadowOffsetX, dp2px(
120 | context, DEFAULT_VALUE_SHADOW_OFFSET_X.toFloat()
121 | )
122 | )
123 | shadowOffsetY = a.getDimensionPixelSize(
124 | R.styleable.ShadowView_shadowOffsetY, dp2px(
125 | context, DEFAULT_VALUE_SHADOW_OFFSET_Y.toFloat()
126 | )
127 | )
128 | // 阴影的宽度
129 | shadowRadius = a.getDimensionPixelSize(
130 | R.styleable.ShadowView_shadowRadius, dp2px(
131 | context, DEFAULT_VALUE_SHADOW_RADIUS.toFloat()
132 | )
133 | )
134 |
135 | a.recycle()
136 | setPadding(shadowRadius, shadowRadius, shadowRadius, shadowRadius)
137 | }
138 |
139 | override fun onDraw(canvas: Canvas) {
140 | super.onDraw(canvas)
141 | }
142 |
143 | override fun dispatchDraw(canvas: Canvas) {
144 | val shadowPaint = Paint()
145 | shadowPaint.color = shadowCardColor
146 | shadowPaint.style = Paint.Style.FILL
147 | shadowPaint.isAntiAlias = true
148 | val left = shadowLeftHeight.toFloat()
149 | val top = shadowTopHeight.toFloat()
150 | val right = (width - shadowRightHeight).toFloat()
151 | val bottom = (height - shadowBottomHeight).toFloat()
152 | shadowPaint.setShadowLayer(shadowRadius.toFloat(), shadowOffsetX.toFloat(), shadowOffsetY.toFloat(), shadowColor)
153 | if (shadowShape == 0) {
154 | // 如果绘制圆角矩形的阴影，用 drawRoundRect
155 | val rectF = RectF(left, top, right, bottom)
156 | canvas.drawRoundRect(rectF, shadowRound.toFloat(), shadowRound.toFloat(), shadowPaint)
157 | } else {
158 | // 如果绘制圆形的阴影，用 drawCircle
159 | val radius = measuredHeight.toFloat() / 2 - shadowRadius
160 | canvas.drawCircle(measuredHeight.toFloat() / 2, measuredHeight.toFloat() / 2, radius, shadowPaint)
161 | }
162 | shadowPaint.utilReset()
163 | canvas.save()
164 | }
165 |
166 | companion object {
167 | private val DEFAULT_VALUE_SHADOW_COLOR = R.color.shadow_default_color
168 | private val DEFAULT_VALUE_SHADOW_CARD_COLOR = R.color.shadow_card_default_color
169 | private const val DEFAULT_VALUE_SHADOW_SHAPE = 0
170 | private const val DEFAULT_VALUE_SHADOW_ROUND = 0
171 | private const val DEFAULT_VALUE_SHADOW_RADIUS = 40
172 | private const val DEFAULT_VALUE_SHADOW_TOP_HEIGHT = 40
173 | private const val DEFAULT_VALUE_SHADOW_LEFT_HEIGHT = 40
174 | private const val DEFAULT_VALUE_SHADOW_RIGHT_HEIGHT = 40
175 | private const val DEFAULT_VALUE_SHADOW_BOTTOM_HEIGHT = 40
176 | private const val DEFAULT_VALUE_SHADOW_OFFSET_Y = 0
177 | private const val DEFAULT_VALUE_SHADOW_OFFSET_X = 0
178 |
179 | fun dp2px(context: Context, dipValue: Float): Int {
180 | val scale = context.resources.displayMetrics.density
181 | return (dipValue * scale + 0.5f).toInt()
182 | }
183 | }
184 |
185 | /**
186 | * 自定义画笔重置方法
187 | */
188 | @JvmOverloads
189 | internal fun Paint.utilReset(colorString: String? = null, @ColorInt color: Int? = null) {
190 | this.reset()
191 | //这里默认值使用白色，可处理掉系统渲染抗锯齿时，人眼可观察到像素颜色
192 | this.color = color ?: Color.parseColor(colorString ?: "#FFFFFF")
193 | this.isAntiAlias = true
194 | this.style = Paint.Style.FILL
195 | this.strokeWidth = 0f
196 | }
197 | }
198 |
199 |
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/src/main/res/values/attrs.xml:
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2 |
3 |
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14 |
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18 |
19 |
20 |
21 |
22 |
23 |
24 |
25 |
26 |
27 |
28 |
29 |
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/src/main/res/values/colors.xml:
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1 |
2 |
3 |
4 | #0F000000
5 | #ffffff
6 |
7 |
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