android - Background service to control proximity sensor -

i need run service (always in background, want service checking if application closed) control proximity sensor status, , when it's covered launch activity. tried had error. examples of this?

p.s. in androidmanifest added:

            <service             android:name="xxx.xxxxx.xxxxx.myservice"             android:enabled="true" /> 

here myservice.java: (eclipse don't report error when try on device, apps give force close.)

import android.app.service; import android.content.intent; import android.hardware.sensor; import android.hardware.sensorevent; import android.hardware.sensoreventlistener; import android.hardware.sensormanager; import android.os.ibinder; import android.widget.toast;   public class myservice extends service implements sensoreventlistener { sensor proxsensor; sensormanager sm;  @override public ibinder onbind(intent intent) {     return null; }  @override public void oncreate() {     toast.maketext(this, "service created", toast.length_long).show();     sm=(sensormanager)getsystemservice(sensor_service);     proxsensor=sm.getdefaultsensor(sensor.type_proximity);      sm.registerlistener(this, proxsensor, sensormanager.sensor_delay_normal); } @override public void onaccuracychanged(sensor sensor, int accuracy) {     // todo auto-generated method stub  }  @override public void onsensorchanged(sensorevent event) {     // todo auto-generated method stub     intent panel = new intent(this, panel.class);     startactivity(panel); } @override public void ondestroy() {     toast.maketext(this, "service stopped", toast.length_long).show(); }  @override public void onstart(intent intent, int startid) {     toast.maketext(this, "service started", toast.length_long).show(); }      } 

and here main.java :

import android.app.activity; import android.content.intent; import android.os.bundle; import android.view.view; import android.view.view.onclicklistener; import android.widget.button; import com.lino99.smarttask.r;  public class main extends activity implements onclicklistener { button buttonstart, buttonstop;  @override public void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.main);  buttonstart = (button) findviewbyid(r.id.buttonstart); buttonstop = (button) findviewbyid(r.id.buttonstop);  buttonstart.setonclicklistener(this); buttonstop.setonclicklistener(this); }  public void onclick(view src) { switch (src.getid()) { case r.id.buttonstart:   startservice(new intent(this, myservice.class));   break; case r.id.buttonstop:   stopservice(new intent(this, myservice.class));   break; } } } 

ok here few changes in code should clear errors , make service ongoing , proximity sensor responsive:

this how service should like:

@override public void oncreate() {//oncreat shouldn't used sensor u should use onstartcommand     toast.maketext(this, "service created", toast.length_long).show(); } @override public void onaccuracychanged(sensor sensor, int accuracy) {     // todo auto-generated method stub  }  @override public void onsensorchanged(sensorevent event) {     // todo auto-generated method stub     //here u should use following code otherwise sensor crazy     if(event.values[0] == 0){     intent panel = new intent(this, panel.class);     startactivity(panel);     } } @override public void ondestroy() {//here u should unregister sensor     toast.maketext(this, "service stopped", toast.length_long).show();     sm.unregisterlistener(this); }  @override//here u should register sensor , write onstartcommand not onstart public int onstartcommand(intent intent, int flags, int startid) {     toast.maketext(this, "service started", toast.length_long).show();     sm=(sensormanager)getsystemservice(sensor_service);     proxsensor=sm.getdefaultsensor(sensor.type_proximity);     sm.registerlistener(this, proxsensor, sensormanager.sensor_delay_normal);      //here u should make service foreground keep working if app closed      notificationmanager mnotificationmanager = (notificationmanager) getsystemservice(notification_service);     intent bintent = new intent(myservice.this, mainactivity.class);            pendingintent pbintent = pendingintent.getactivity(myservice.this, 0 , bintent, 0);     notificationcompat.builder bbuilder =             new notificationcompat.builder(this)                 .setsmallicon(r.drawable.ic_launcher)                 .setcontenttitle("title")                 .setcontenttext("subtitle")                 .setautocancel(true)                 .setongoing(true)                 .setcontentintent(pbintent);     barnotif = bbuilder.build();     this.startforeground(1, barnotif);          //then should return sticky         return service.start_sticky; } 

}

ok try code , let me know how works you, hope helped.