修正 ShapeDrawable 阴影区域大小计算规则有误差的问题

修复在 Android 8.1 及以下版本使用无圆角阴影会出现变黑的问题

Author: getActivity

README.md

@@ -4,7 +4,7 @@
 
 * 博客介绍：[震惊，没想到 Shape 也可以这么写](https://www.jianshu.com/p/1288d8873440)
 
-* 可以扫码下载 Demo 进行演示或者测试，如果扫码下载不了的，[点击此处可直接下载](https://github.com/getActivity/ShapeView/releases/download/8.2/ShapeView.apk)
+* 可以扫码下载 Demo 进行演示或者测试，如果扫码下载不了的，[点击此处可直接下载](https://github.com/getActivity/ShapeView/releases/download/8.3/ShapeView.apk)
 
 ![](picture/demo_code.png)
 
@@ -47,7 +47,7 @@ android {
 
 dependencies {
     // Shape 框架：https://github.com/getActivity/ShapeView
-    implementation 'com.github.getActivity:ShapeView:8.2'
+    implementation 'com.github.getActivity:ShapeView:8.3'
 }
 ```
 

app/build.gradle

@@ -8,8 +8,8 @@ android {
         minSdkVersion 16
         // noinspection ExpiredTargetSdkVersion
         targetSdkVersion 28
-        versionCode 82
-        versionName "8.2"
+        versionCode 83
+        versionName "8.3"
     }
 
     // 支持 Java JDK 8
@@ -63,5 +63,5 @@ dependencies {
     implementation 'com.github.getActivity:TitleBar:9.5'
 
     // 内存泄漏检测：https://github.com/square/leakcanary
-    debugImplementation 'com.squareup.leakcanary:leakcanary-android:2.8.1'
+    debugImplementation 'com.squareup.leakcanary:leakcanary-android:2.9.1'
 }

app/src/main/res/layout/activity_main.xml

@@ -211,7 +211,6 @@
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:layout_margin="10dp"
-                android:clickable="true"
                 android:gravity="center"
                 android:paddingTop="30dp"
                 android:paddingBottom="30dp"
@@ -224,6 +223,22 @@
                 app:shape_shadowSize="10dp"
                 app:shape_solidColor="#FFFFFF" />
 
+            <com.hjq.shape.view.ShapeTextView
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_margin="10dp"
+                android:gravity="center"
+                android:paddingTop="30dp"
+                android:paddingBottom="30dp"
+                android:text="直角阴影效果"
+                android:textColor="@android:color/black"
+                android:textSize="14sp"
+                app:shape="rectangle"
+                app:shape_radius="1px"
+                app:shape_shadowColor="#20000000"
+                app:shape_shadowSize="10dp"
+                app:shape_solidColor="#FFFFFF" />
+
             <com.hjq.shape.view.ShapeTextView
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
@@ -376,9 +391,9 @@
                 android:layout_margin="10dp"
                 android:gravity="center"
                 android:padding="10dp"
-                app:shape_textColor="#5A8DDF"
                 android:text="文本边框颜色效果"
                 android:textSize="18sp"
+                app:shape_textColor="#5A8DDF"
                 app:shape_textEndColor="#f08833"
                 app:shape_textGradientOrientation="horizontal"
                 app:shape_textStartColor="#fefa54"
@@ -932,8 +947,8 @@
                 android:text="线在字的左边"
                 android:textColor="@android:color/black"
                 android:textSize="14sp"
-                app:shape_lineGravity="start"
                 app:shape="line"
+                app:shape_lineGravity="start"
                 app:shape_strokeColor="#ffff0000"
                 app:shape_strokeWidth="2dp"/>
 
@@ -946,8 +961,8 @@
                 android:text="改变线的大小和颜色"
                 android:textColor="@android:color/black"
                 android:textSize="14sp"
-                app:shape_lineGravity="bottom"
                 app:shape="line"
+                app:shape_lineGravity="bottom"
                 app:shape_strokeColor="#ffff00ff"
                 app:shape_strokeWidth="3dp" />
 

library/build.gradle

@@ -5,8 +5,8 @@ android {
 
     defaultConfig {
         minSdkVersion 16
-        versionCode 82
-        versionName "8.2"
+        versionCode 83
+        versionName "8.3"
     }
 
     // 支持 Java JDK 8

library/src/main/java/com/hjq/shape/drawable/ShapeDrawable.java

@@ -319,6 +319,7 @@ public ShapeDrawable setGradientOrientation(ShapeGradientOrientation orientation
     public ShapeDrawable setShadowColor(int color) {
         mShapeState.setShadowColor(color);
         mPathIsDirty = true;
+        mRectIsDirty = true;
         invalidateSelf();
         return this;
     }
@@ -329,6 +330,7 @@ public ShapeDrawable setShadowColor(int color) {
     public ShapeDrawable setShadowSize(int size) {
         mShapeState.setShadowSize(size);
         mPathIsDirty = true;
+        mRectIsDirty = true;
         invalidateSelf();
         return this;
     }
@@ -339,6 +341,7 @@ public ShapeDrawable setShadowSize(int size) {
     public ShapeDrawable setShadowOffsetX(int offsetX) {
         mShapeState.setShadowOffsetX(offsetX);
         mPathIsDirty = true;
+        mRectIsDirty = true;
         invalidateSelf();
         return this;
     }
@@ -349,6 +352,7 @@ public ShapeDrawable setShadowOffsetX(int offsetX) {
     public ShapeDrawable setShadowOffsetY(int offsetY) {
         mShapeState.setShadowOffsetY(offsetY);
         mPathIsDirty = true;
+        mRectIsDirty = true;
         invalidateSelf();
         return this;
     }
@@ -516,7 +520,8 @@ of the fill (if any) without worrying about blending artifacts.
             }
 
              mShadowPaint.setColor(shadowColor);
-             mShadowPaint.setMaskFilter(new BlurMaskFilter(mShapeState.mShadowSize, BlurMaskFilter.Blur.NORMAL));
+             // 这里解释一下为什么要阴影大小除以 1.2f，因为如果不这么做会导致阴影显示会超过 View 边界，从而导致出现阴影被截断的效果
+             mShadowPaint.setMaskFilter(new BlurMaskFilter(mShapeState.mShadowSize / 1.2f, BlurMaskFilter.Blur.NORMAL));
 
         } else {
             if (mShadowPaint != null) {
@@ -796,12 +801,10 @@ private boolean ensureValidRect() {
 
             final ShapeState st = mShapeState;
 
-            float shadowScale = 1.2f;
-
-            float let = bounds.left + inset + mShapeState.mShadowSize * shadowScale;
-            float top = bounds.top + inset + mShapeState.mShadowSize * shadowScale;
-            float right = bounds.right - inset - mShapeState.mShadowSize * shadowScale;
-            float bottom = bounds.bottom - inset - mShapeState.mShadowSize * shadowScale;
+            float let = bounds.left + inset + mShapeState.mShadowSize;
+            float top = bounds.top + inset + mShapeState.mShadowSize;
+            float right = bounds.right - inset - mShapeState.mShadowSize;
+            float bottom = bounds.bottom - inset - mShapeState.mShadowSize;
 
             mRect.set(let, top, right, bottom);
 

library/src/main/java/com/hjq/shape/drawable/ShapeState.java

@@ -172,6 +172,11 @@ private void computeOpacity() {
             return;
         }
 
+        if (mShadowSize > 0) {
+            mOpaque = false;
+            return;
+        }
+
         if (mStrokeWidth > 0 && !isOpaque(mStrokeColor)) {
             mOpaque = false;
             return;