android - checking battery level in background and notify when reach 7 percentage -

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can code android app run in background , continuously checks battery percentage , notify me when battery level reaches 7 percentage, tried installing not showing app on screen.

here listen intent (action_battery_changed) , register receiver when intent fired. in actionscript, believe dispatchevent, , call mbatinforeceiver , current level of our battery life , put int value our textfield or textview.

public class main extends activity {   private textview contenttxt;   private broadcastreceiver mbatinforeceiver = new broadcastreceiver(){     @override     public void onreceive(context arg0, intent intent) {       int level = intent.getintextra("batterylevel", 7);       contenttext.settext(string.valueof(level) + "%");     }   };    @override   public void oncreate(bundle icicle) {     super.oncreate(icicle);     setcontentview(r.layout.main_layout);     contenttext = (textview) this.findviewbyid(r.id.mspacetxt);     this.registerreceiver(this.mbatinforeceiver,      new intentfilter(intent.action_battery_changed));   } }

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