[android-developers] Re: launch activity like phone call
ok thanks for the explanation. i learn more :D On Sep 28, 8:13 pm, Mark Murphy wrote: > sleith wrote: > > Hi, > > wanna ask again about Mark's first warning: > > " Your service will not be running for very long once the screen turns > > off. The phone will go to sleep, and your service will stop running > > when > > the phone turns off the CPU. " > > > when the phone turns on the CPU again, will the service restarted > > automatically? > > "Restarted"? A running service will start running again, but to me > "restart" implies it was destroyed and recreated, which does not happen. > > When the CPU shuts down, everything freezes in mid-operation. When the > CPU starts up again, everything continues from where it was. > > Again, I strongly advise against having services run indefinitely. A > well-constructed service only runs when it needs to (via an alarm) and > can arrange via a WakeLock to keep the CPU running for the short period > it needs to run. See more at: > > http://www.androidguys.com/2009/09/09/diamonds-are-forever-services-a... > > -- > Mark Murphy (a Commons > Guy)http://commonsware.com|http://twitter.com/commonsguy > > Android Development Wiki:http://wiki.andmob.org --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Re: launch activity like phone call
sleith wrote: > Hi, > wanna ask again about Mark's first warning: > " Your service will not be running for very long once the screen turns > off. The phone will go to sleep, and your service will stop running > when > the phone turns off the CPU. " > > when the phone turns on the CPU again, will the service restarted > automatically? "Restarted"? A running service will start running again, but to me "restart" implies it was destroyed and recreated, which does not happen. When the CPU shuts down, everything freezes in mid-operation. When the CPU starts up again, everything continues from where it was. Again, I strongly advise against having services run indefinitely. A well-constructed service only runs when it needs to (via an alarm) and can arrange via a WakeLock to keep the CPU running for the short period it needs to run. See more at: http://www.androidguys.com/2009/09/09/diamonds-are-forever-services-are-not/ -- Mark Murphy (a Commons Guy) http://commonsware.com | http://twitter.com/commonsguy Android Development Wiki: http://wiki.andmob.org --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Re: launch activity like phone call
Hi, wanna ask again about Mark's first warning: " Your service will not be running for very long once the screen turns off. The phone will go to sleep, and your service will stop running when the phone turns off the CPU. " when the phone turns on the CPU again, will the service restarted automatically? if it won't, how to know if the CPU has been turned on/off? thanks On Sep 27, 5:35 pm, sleith wrote: > Hi, > thanks Mark for your advice, that's a nice input from you :) > > On Sep 27, 5:26 pm, Mark Murphy wrote: > > > sleith wrote: > > > i've tested when the phone screen is off, the service is still > > > running, but when the service try to start intent, the screen is still > > > not shown because it's off. when the screen is on again, i can see the > > > intent that was launched by service. > > > is there any way to make the screen on by programming? because when we > > > receive call, the screen will on. so i think it is possible :D > > > First, the warnings: > > > 1. Your service will not be running for very long once the screen turns > > off. The phone will go to sleep, and your service will stop running when > > the phone turns off the CPU. > > > 2. Doing things that wake up the phone are bad for battery life. See > > Jeff Sharkey's "Coding for Life...Battery Life, That Is" presentation > > from Google I/O 2009 for statistics. > > > 3. Popping up user interfaces from a service are bad for the user > > experience. If the user is, say, in the middle of typing a text message, > > and your service-spawned activity steals the foreground, they may have > > quite a few profanities to fling in your direction. An incoming phone > > call is one of the few things users might tend to agree warrants such an > > intrusion...and I suspect there are still many a curse word used when > > users get interrupted, even for that. > > > Hence, before you even bother with any code, you need to really make > > sure that this is what you want to do, and consider offering user > > preferences to disable this functionality. > > > All that said, you will want to look at PowerManager.WakeLock to arrange > > to keep the screen and CPU on for a while. Which leads to: > > > 4. Misusing WakeLocks are horrible for the battery. Do not leak an > > acquired WakeLock. > > > -- > > Mark Murphy (a Commons > > Guy)http://commonsware.com|http://twitter.com/commonsguy > > > Android Training in Germany, 18-22 January 2010:http://bignerdranch.com > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Re: launch activity like phone call
Hi, thanks Mark for your advice, that's a nice input from you :) On Sep 27, 5:26 pm, Mark Murphy wrote: > sleith wrote: > > i've tested when the phone screen is off, the service is still > > running, but when the service try to start intent, the screen is still > > not shown because it's off. when the screen is on again, i can see the > > intent that was launched by service. > > is there any way to make the screen on by programming? because when we > > receive call, the screen will on. so i think it is possible :D > > First, the warnings: > > 1. Your service will not be running for very long once the screen turns > off. The phone will go to sleep, and your service will stop running when > the phone turns off the CPU. > > 2. Doing things that wake up the phone are bad for battery life. See > Jeff Sharkey's "Coding for Life...Battery Life, That Is" presentation > from Google I/O 2009 for statistics. > > 3. Popping up user interfaces from a service are bad for the user > experience. If the user is, say, in the middle of typing a text message, > and your service-spawned activity steals the foreground, they may have > quite a few profanities to fling in your direction. An incoming phone > call is one of the few things users might tend to agree warrants such an > intrusion...and I suspect there are still many a curse word used when > users get interrupted, even for that. > > Hence, before you even bother with any code, you need to really make > sure that this is what you want to do, and consider offering user > preferences to disable this functionality. > > All that said, you will want to look at PowerManager.WakeLock to arrange > to keep the screen and CPU on for a while. Which leads to: > > 4. Misusing WakeLocks are horrible for the battery. Do not leak an > acquired WakeLock. > > -- > Mark Murphy (a Commons > Guy)http://commonsware.com|http://twitter.com/commonsguy > > Android Training in Germany, 18-22 January 2010:http://bignerdranch.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Re: launch activity like phone call
sleith wrote: > i've tested when the phone screen is off, the service is still > running, but when the service try to start intent, the screen is still > not shown because it's off. when the screen is on again, i can see the > intent that was launched by service. > is there any way to make the screen on by programming? because when we > receive call, the screen will on. so i think it is possible :D First, the warnings: 1. Your service will not be running for very long once the screen turns off. The phone will go to sleep, and your service will stop running when the phone turns off the CPU. 2. Doing things that wake up the phone are bad for battery life. See Jeff Sharkey's "Coding for Life...Battery Life, That Is" presentation from Google I/O 2009 for statistics. 3. Popping up user interfaces from a service are bad for the user experience. If the user is, say, in the middle of typing a text message, and your service-spawned activity steals the foreground, they may have quite a few profanities to fling in your direction. An incoming phone call is one of the few things users might tend to agree warrants such an intrusion...and I suspect there are still many a curse word used when users get interrupted, even for that. Hence, before you even bother with any code, you need to really make sure that this is what you want to do, and consider offering user preferences to disable this functionality. All that said, you will want to look at PowerManager.WakeLock to arrange to keep the screen and CPU on for a while. Which leads to: 4. Misusing WakeLocks are horrible for the battery. Do not leak an acquired WakeLock. -- Mark Murphy (a Commons Guy) http://commonsware.com | http://twitter.com/commonsguy Android Training in Germany, 18-22 January 2010: http://bignerdranch.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Re: launch activity like phone call
Hi, thanks for your fast response :D how about the questions number 1? i've tested when the phone screen is off, the service is still running, but when the service try to start intent, the screen is still not shown because it's off. when the screen is on again, i can see the intent that was launched by service. is there any way to make the screen on by programming? because when we receive call, the screen will on. so i think it is possible :D thank you On Sep 27, 3:50 pm, Dianne Hackborn wrote: > On Sun, Sep 27, 2009 at 1:47 AM, sleith wrote: > > 2. how to start a service right after downloaded and installed from > > android market? > > This is deliberately not supported. You can start the service when the user > launches your app. > > -- > Dianne Hackborn > Android framework engineer > hack...@android.com > > 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. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Re: launch activity like phone call
On Sun, Sep 27, 2009 at 1:47 AM, sleith wrote: > 2. how to start a service right after downloaded and installed from > android market? > This is deliberately not supported. You can start the service when the user launches your app. -- Dianne Hackborn Android framework engineer hack...@android.com 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. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
