Android 中的 ManagedQuery()

深碍√TFBOYSˉ_ 2022-06-13 00:12 260阅读 0赞

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      <span style="font-family:inherit">&nbsp;</span> 
      <span style="font-family:inherit"><span style="font-family:微软雅黑; font-size:24px">Android 中的 ManagedQuery()</span></span>&nbsp;&nbsp; 
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        <p style="font-family:inherit"><strong>用途：</strong><br> <br> 根据指定的URI路径信息返回包含特定数据的Cursor对象，应用这个方法可以使Activity接管返回数据对象的生命周期。<br> <br> <strong>参数：</strong><br> <br> URI:&nbsp;&nbsp;Content Provider 需要返回的资源索引<br> <br> Projection: 用于标识有哪些columns需要包含在返回数据中。<br> <br> Selection: 作为查询符合条件的过滤参数，类似于SQL语句中Where之后的条件判断。<br> <br> SelectionArgs: 同上。<br> <br> SortOrder: 用于对返回信息进行排序。<br> <br> <strong>下面是有关 ContentResolver.query() 和 Activity.managedQuery() 两个方法的区别：</strong><br> <br> &nbsp; To query a content provider, you can use either theContentResolver.query() method or the Activity.managedQuery() method.Both methods take the same set of arguments, and both return a Cursorobject. However, managedQuery() causes the activity to manage the lifecycle of the Cursor. [...]</p> 
        <p style="font-family:inherit"><strong>我也来翻译下：</strong></p> 
        <p style="font-family:inherit">&nbsp;对于查询一个内容提供者，你可以使用&nbsp;<strong>ContentResolver.query()&nbsp;</strong>或者&nbsp;<strong>Activity.managedQuery()&nbsp;</strong>方法。两种方法都带有相同参数，并且都返回 Cursor 对象。然后，Activity.managedQuery()&nbsp; 方法导致活动管理 Cursor 的生命周期。</p> 
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