I m New to android. 现在是Im 做内容提供者。 I m 遵循“Pro android 3”书。 我从那里执行了<代码>BookProvider。 我已在<条码>中履行以下职能:<条码>、更新日期、delete;>条码,延伸至<条码>。 但是,在行使职能时,我使用了:
ContentResolver cr = context.getContentResolver();
cr.delete(uri,contentValues);
我怀疑,我在<代码>BookProvider类别中书写的方法与ContentResolver类别......
另外,请举例说明以下几类基本定义、区别和关系:>Context ,ContentProvider和.ContentResolver。
更令人怀疑的是,在某些例子中,它们明确地将环境物体纳入活动目标......。 活动和背景类别如何相关?
A Context contains information about the context where an Activity, Service or BroadcastReceiver is running. All those classes inherit directly or indirectly from Context. So it stands that all Activityies are Contexts, but only some Contexts are Activityies
当你界定了<条码>自动提供人时,请具体说明可以处理的内容的一个或多个基端。 <代码>ContentResolver 的工作是,根据你提供的内容,向ContentProvider发出指示。
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