摘要：已解决：1、Error generating final archive: Debug Certificate expired on 10/09/18 16:30 原因分析：android要求所有的程序必须有签名，否则就不会安装该程序。在我们开发过程中，adt使用debug keystore，在 p... 阅读全文

摘要：WARNING: Application does not specify an API level requirement! Re-installation failed due to different application signatures. You must perform a full uninstall of the application. WARNING: This will remove the application data! Please execute 'adb uninstall com.example.android.apis' in a shell. Launch canceled! 阅读全文

摘要：A Fragment represents a behavior or a portion of user interface in an Activity. You can combine multiple fragments in a single activity to build a multi-pane UI and reuse a fragment in multiple activities. You can think of a fragment as a modular section of an activity, which has its own lifecycle, receives its own input events, and which you can add or remove while the activity is running. Fragm 阅读全文