Thank you Dianne, I'll make sure to use the inheritance. But why is it so much faster when not inheriting, not using '"parent="android:Theme"'?
When using style-inheritance properly: In the beginning i also thought that my code was the slow part in starting up and preventing a quick initial drawing of the activity's content-view. However, I put tons of timing statements in (e.g. i time the onCreate begins and ends and the system's calls to onResume, onStart, onPostResume, etc). All the timing statements indicate that onCreate finishes timely, onPostCreate, onResume, etc. are all called and finished in a timely manner. I see the last timing statement (log of 'onCreateStartTime- System.currentMillis()') in my onResume() implementation in the log, which appears quickly, in a timely manner. Then the activity just sits there for 0.5 - 2 seconds showing the theme's background without the activity's content. After the 0.5 - 2 seconds, the content shows up. I just can't figure out what happens between after the call to onResume and the appearance of the activity's content.... and why it is slow, even for an activity with hardly any content (a few text- fields, that's all, no large intent-data either). Thanks! On Oct 8, 7:05 pm, Dianne Hackborn <[email protected]> wrote: > First, a theme MUST inherit from one of the standard ones. If it doesn't, > some things won't work now, some things will break in the future, etc. > > When an app is being launched for the first time, a preview of it is first > shown by constructing a window with the theme from its manifest and showing > that. The delay from when that empty window is shown until the actual app > is faded in is the time it is taking your app to launch. If you want to > reduce that, you need to profile and optimize your app's launch time. > > On Fri, Oct 8, 2010 at 3:50 PM, Streets Of Boston > <[email protected]>wrote: > > > > > > > When i create an activity that uses a custom-theme, e.g. > > android:theme="@style/MyLogonTheme". > > > I create my theme in styles.xml: > > > <style name="MyLogonTheme" parent="android:Theme"> > > <item name="android:typeface">sans</item> > > <item name="android:windowBackground">@drawable/ > > android_screen_logon_bg</item> > > </style> > > > (note that i have a few more themes and plenty more styles in > > styles.xml, but they are not in use for this particular activity). > > > When the activity is started brand new (e.g. after the process has > > just started), it starts VERY slowly: > > 1. The background (windowBackground) appears quickly, in a timely > > manner and the activity's 'setContentView' is called almost > > immediately in the onCreate. > > 2. However, the activity's content-view (setContentView) finally shows > > up 0.5 - 2 seconds later (depending on the speed of the phone)! > > > When i remove the 'parent' from MyLogonTheme's definition: > > <style name="MyLogonTheme"> > > <item name="android:typeface">sans</item> > > <item name="android:windowBackground">@drawable/ > > android_screen_logon_bg</item> > > </style> > > Both the background and the content-view appear quickly! > > > Somehow, including the inheritance from the "android:Theme" slows > > things down quite considerably. > > > Why is this the case? > > Is there a way around it? > > > I looked at the log... no special output that may indicate > > something... it is just slow. > > > BTW: > > If i do remove the parent="android:Theme" part, things do load/show > > quickly, but i get quite a few warnings in the log. The warnings > > complain about layout_height is missing and some ColorStateList with > > TypedValue (0x2/0x1010059 a=-1) can not be found. They are just > > warnings... i see no other side effects. > > If i specify the parent="android:Theme", I don't get these warnings. > > > Can I just remove the parent="android:Theme" part and live with the > > warnings? > > > Thanks! > > > -- > > You received this message because you are subscribed to the Google > > Groups "Android Developers" group. > > To post to this group, send email to [email protected] > > To unsubscribe from this group, send email to > > [email protected]<android-developers%2bunsubs[email protected]> > > For more options, visit this group at > >http://groups.google.com/group/android-developers?hl=en > > -- > Dianne Hackborn > Android framework engineer > [email protected] > > Note: please don't send private questions to me, as I don't have time to > provide private support, and so won't reply to such e-mails. All such > questions should be posted on public forums, where I and others can see and > answer them.- Hide quoted text - > > - Show quoted text - -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
