如何从市场升级时重置应用状态 [英] How to reset an application states when upgrading from the market

问题描述

作为一个开发人员，我已经发布了市场上的应用程序。当用户下载新版本，我要清理其状态（共享preferences，SQLite的模式......）应用程序。我读到 SQLiteOpenHelper 。我想，当我加载Eclipse中的设备上创建新的apk，应用程序仍保持其previous共享preferences。如果数据库架构发生变化，应用程序会崩溃。

As a developer, I have applications already published on the market. When users download the new version, I want the application to clean its states ( SharedPreferences , SQLite schema ... ). I read about SQLiteOpenHelper. I suppose when I'm loading a new .apk on the device from Eclipse, the app still keeps its previous SharedPreferences . If the DB schema changed, the app will crash.

是否有可能触发一个干净的状态，当应用程序被从市场升级？

Is it possible to trigger a "clean states" when the application is being upgraded from the market ?

推荐答案

要你的问题，你应该能够触发使用SQLiteOpenHelper <一个数据库更新href=\"http://developer.android.com/reference/android/database/sqlite/SQLiteOpenHelper.html#onUpgrade%28android.database.sqlite.SQLiteDatabase,%20int,%20int%29\"相对=nofollow> OnUpgrade （其他城市DATABASE_VERSION在你的类），要么调用从那里功能来清除preferences或添加标志的分贝，这和做它在你的主程序。

To your question, you should be able to trigger a database update using SQLiteOpenHelper OnUpgrade (change DATABASE_VERSION in your class) and either call a function from there to clear the preferences or add a flag to the db for this and do it in your main program.

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