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摘要：
Access level modifiers determine whether other classes can use a particular field or invoke a particular method. There are two levels of access control:At the top level—public, or package-private (no explicit modifier).At the member level—public, private, protected, or package-private (no explicit m 阅读全文
摘要：
By john Android, services, singleton 12 commentsPassing data back and forth between activities on the Android platform is one of the more challenging aspects of understanding Android. Understanding how this data is managed by the OS is the difference between getting flooded with Error Reports and ba 阅读全文
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