android - open app when screen on -

i'm trying app started when screen on. lockscreen should show everytime screen goes on. following code wrote far , i'm not sure wrong. there no error message. application runs won't start when screen goes on.

this receiver:

package com.example.screenlocker;  import android.content.broadcastreceiver; import android.content.context; import android.content.intent;  public class startmyserviceatbootreceiver extends broadcastreceiver {   public static boolean screenoff = true;  @override public void onreceive(context context, intent intent) {     if (intent.getaction().equals(intent.action_screen_on)) {         screenoff = true;         intent = new intent(context,lockservice.class);         i.putextra("screen_state", screenoff);         context.startservice(i);        } else if (intent.getaction().equals(intent.action_screen_off)) {         screenoff = false;     } } 

and service:

package com.example.screenlocker;  import android.app.service; import android.content.broadcastreceiver; import android.content.intent; import android.content.intentfilter; import android.os.ibinder;  public class lockservice extends service {  public void oncreate(){     intentfilter filter=new intentfilter(intent.action_screen_on);     filter.addaction(intent.action_screen_off);     broadcastreceiver locker=new startmyserviceatbootreceiver();     registerreceiver(locker, filter); }    @override   public void onstart(intent intent, int startid) {       boolean screenon = intent.getbooleanextra("screen_state", false);               if(screenon){                 startactivity(new intent(this, mainactivity.class));                   }    }  @override public ibinder onbind(intent arg0) {     // todo auto-generated method stub     return null; } } 

maybe know wrong.

you gave if expression wrong if see correctly.

if (intent.getaction().equals(intent.action_screen_on)) {     screenoff = true;     intent = new intent(context,lockservice.class);     i.putextra("screen_state", screenoff);     context.startservice(i);    } 

you set screenoff = true when comes on. switch false , bellow in action_screen_off true.