在Android4.0(API leverl 14)中使用ActionProvider能夠更容易的實現一個在ActionBar中的方便使用和高效的共用Action。一旦一個ActionProvider附加到ShareActionProvider菜單中,你只需要提供一個共用的Intent就可以,剩下的其他工作由它來完成。注意一點:ActionProvider只能用在API lever 14及以後的版本中。
今天自訂了一個AlertDialog對話方塊,第一次點擊時正常,但第二次調用時會出現錯誤:java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first. 出錯的代碼為:[java] //視窗構造器 synchronized protected
An important aspect of the user experience when operating a TV is the direct human interface: a remote control. As you optimize your Android application for TVs, you should pay special attention to how the user actually navigates around your
The exhaustive screen map from the previous lesson isn't tied to a particular device form factor, although it can generally look and work okay on a handset or similar-size device. But Android applications need to adapt to a number of different
To perform a query, create the CursorLoader, set up its query, and pass it to the loader framework. From then on, the framework manages everything. It runs the query on a background thread, returns the results to the foreground, and watches for