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滑动到中间放大，左右两边随之缩小的头像轮播

效果如下所示：

Name		Name	Last commit message	Last commit date
Latest commit History 5 Commits
.idea		.idea
app		app
gradle/wrapper		gradle/wrapper
.gitignore		.gitignore
README.md		README.md
build.gradle		build.gradle
gradle.properties		gradle.properties
gradlew		gradlew
gradlew.bat		gradlew.bat
img.jpg		img.jpg
settings.gradle		settings.gradle

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