Battery efficient android widget that updates once a minute -

i know possible duplicate, havent found specific answer this? (there partial answers on how force widget update every second not after...)

1. i need have widget update once minute.

2. how make battery&cpu&ram efficient widget purpose? (the data fetched internet , parsed before showing user(a small amount of data , processing done.))

3. should make service runs on boot if user has widget on screen , have service schedule alarm manager wakes service updates widget?

also pause service if screen locked or off save battery...

that's how did similar. created service (intentservice if don't need complicated) , register alarm manager.

long interval = intervalminutes * 60 * 1000; long firsttime = calendar.getinstance().gettimeinmillis();  intent = new intent(ctx, alarmservice.class); // use widget id update 1 widget @ time. i.putextra(appwidgetmanager.extra_appwidget_id, id); pendingintent malarmsender = pendingintent.getservice(ctx, id, i, pendingintent.flag_update_current);  alarmmanager = (alarmmanager) ctx.getsystemservice(alarm_service); am.setrepeating(alarmmanager.rtc_wakeup, firsttime, interval, malarmsender); 

being alarmservice.class service or intentservice.

for boot event, can create broadcastreceiver , manage android.intent.action.boot_completed action can register alarm.

you can register event in androidmanifest:

<receiver android:name=".broadcastreceiverwidget" >     <intent-filter>         <action android:name="android.intent.action.boot_completed" />     </intent-filter> </receiver>