Android Studio导入项目的时候，一直卡在Building gradle project info这一步，主要原因还是因为被墙的结果。gradle官网虽然可以访问，但是速度连蜗牛都赶不上...解决办法主要有
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默认在Android SDK安装目录的docsreferencepackages.html下。下面是Android的sdk、api及工程目录说明：SDK下包的说明：1：add-ons：Android开发需要的第三方文
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Broadcast Receiverssimply respond to broadcast messages from other applications or from the system itself.
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An AndroidIntentis an abstract description of an operation to be performed. It can be used withstartActivity
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Android is an open source and Linux-based operating system for mobile devices such as smartphones and tablet
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A content provider component supplies data from one application to others on request. Such requests are ha
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WML 文档实例：
http://www.wapforum.org/DTD/wml_1.1.xml>
Our HTML Tutorial is an award winning
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The basic building block for user interface is aViewobject which is created from the View class and occupies
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