可以监听删除位置的艾特（@）功能的edittext

int insertRichItem 添加添加富文本时所在的位置

Name		Name	Last commit message	Last commit date
Latest commit History 4 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
settings.gradle		settings.gradle

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