Coding for Android Device Battery Life

Most of us have to pay attention to battery life these days. And as a dumb end user there is only so much I can do to regulate battery life. Turning devices off, dimming screens, shutting down wireless connections and, in general, just not using my devices are the sorts of things end users can control.

Of course, that sort of defeats the purpose of having always-on devices, doesn't it? Application developers can do some things to help when they create apps, and hardware engineers can do some things when they design devices.

Ironically, we are so "digital" these days that radio frequency engineering is almost a lost art, as you might infer from the antenna issues the iPhone 4 has been having.

But Android developers can do some things when they develop code that has a direct bearing on power consumption.

Energy Consumption up 250% by 2030, but Mobiles Help

Electricity consumption by "electronics" grew by nearly seven percent each year from 1990 to 2008, says Paul Waide, International Energy Agency senior policy analyst. And electricity consumption is likely to grow by 250 percent by 2030, as a majority of growth already is coming from non-OECD countries.

But use of mobile devices, which is growing rapidly, helps, as mobiles tend to be more power efficient. In fact, says the IEA, matters would be worse but for the convergence of technologies and the growth in mobile applications such as laptop computers, which draw less power.

The IEA study finds that over the next seven months, the number of people using a personal computer will pass the one billion mark. Electronic devices currently account for 15 percent of household electricity consumption but their share is rapidly rising.

Already there are nearly two billion television sets in use, with an average of over 1.3 sets in each home having access to electricity.

Without new policies, the energy consumed by information and communications technologies as well as consumer electronics will double by 2022 and increase threefold by 2030 to 1 700 Terawatt hours (TWh), says Nobuo Tanaka, International Energy Agency Executive Director

Higher efficiency technologies that are already available would half this demand, he notes. So aside from more-efficient technologies, unplugging devices when not in use, unplugging mobiles when fully charged and turning off unused applications such as Bluetooth or Wi-Fi when not needed are steps people can take to limit electrical consumption.

http://www.iea.org/Textbase/press/pressdetail.asp?PRESS_REL_ID=284