[android-developers] battery life with proximity Alert

hello,

i have read, that the usage of the proximity alert function isnt the
best for the battery.
What other solutions are a good way?? Shall I use xxx.distanceTo(loc)
function?
I have many POI, which I want to visit step by step. If i am near the
first point, the TTS engine say something and i walk to the next POI.

Thanks,
Stefan
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