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do you have link/tutorial for compare the battery level before and after an activity/computation process?

Comic Sans MS Lover
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user1372013
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    There are many links on battery usage in the **Related** column, over there --> – Sam May 06 '12 at 15:56

1 Answers1

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For most devices, the granularity of reported battery changes is 1% of capacity. If your "activity/computation process" consumes more than 1% power, it had better be running for quite some time.

That being said, call registerReceiver(null, new IntentFilter(Intent.ACTION_BATTERY_CHANGED)). Since ACTION_BATTERY_CHANGED is a sticky broadcast, the registerReceiver() call will return the last broadcast Intent. Then, retrieve the BatteryManager.EXTRA_LEVEL and BatteryManager.EXTRA_SCALE values to determine the battery level. Just bear in mind that:

  • While EXTRA_SCALE is frequently 100, it is not always 100

  • While EXTRA_LEVEL frequently changes in increments of 1 (e.g., 100, 99, 98), it does not always change in increments of 1

CommonsWare
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