java - Android Studio, Google Maps Search Button is not working -


i worte android application google maps integration. found tutorial in youtube , did in way in video search location button click. have simple plaintext , button search. button set onclick method onsearch() can find code bellow.

when press on button, app crashing. wrong in code??

thank in advance:

public void onsearch(view v){          //textfield in google maps activity         edittext location_tf=(edittext) findviewbyid(r.id.tfadress);         //put written input string work         string location = location_tf.gettext().tostring();          //list geocoder         list<address> addresslist= null;          if(location!= null || !location.equals("")){             geocoder geocoder = new geocoder(this);             try {                 addresslist=geocoder.getfromlocationname(location,1);             } catch (ioexception e) {                 e.printstacktrace();             }             address address = addresslist.get(0);             latlng latlng= new latlng(address.getlatitude(), address.getlongitude());             mmap.addmarker(new markeroptions().position(latlng).title("searched location"));              //movethecamera searched location 18 zoom             mmap.movecamera(cameraupdatefactory.newlatlngzoom(latlng, 18));         }  }

error log:

08-18 13:25:36.182 2619-2619/com.group6.travlhoe e/androidruntime: fatal exception: main process: com.group6.travlhoe, pid: 2619 java.lang.illegalstateexception: not execute method android:onclick @ android.view.view$declaredonclicklistener.onclick(view.java:5336) @ android.view.view.performclick(view.java:6256) @ android.view.view$performclick.run(view.java:24697) @ android.os.handler.handlecallback(handler.java:789) @ android.os.handler.dispatchmessage(handler.java:98) @ android.os.looper.loop(looper.java:164) @ android.app.activitythread.main(activitythread.java:6541) @ java.lang.reflect.method.invoke(native method) @ com.android.internal.os.zygote$methodandargscaller.run(zygote.java:240) @ com.android.internal.os.zygoteinit.main(zygoteinit.java:767) caused by: java.lang.reflect.invocationtargetexception @ java.lang.reflect.method.invoke(native method) @ android.view.view$declaredonclicklistener.onclick(view.java:5331) @ android.view.view.performclick(view.java:6256)  @ android.view.view$performclick.run(view.java:24697)  @ android.os.handler.handlecallback(handler.java:789)  @ android.os.handler.dispatchmessage(handler.java:98)  @ android.os.looper.loop(looper.java:164)  @ android.app.activitythread.main(activitythread.java:6541)  @ java.lang.reflect.method.invoke(native method)  @ com.android.internal.os.zygote$methodandargscaller.run(zygote.java:240)  @ com.android.internal.os.zygoteinit.main(zygoteinit.java:767)  caused by: java.lang.nullpointerexception: attempt invoke interface method 'java.lang.object java.util.list.get(int)' on null object reference @ com.group6.takeoff.mapsactivity.onmapsearch(mapsactivity.java:84) @ java.lang.reflect.method.invoke(native method)  @ android.view.view$declaredonclicklistener.onclick(view.java:5331)  @ android.view.view.performclick(view.java:6256)  @ android.view.view$performclick.run(view.java:24697)  @ android.os.handler.handlecallback(handler.java:789)  @ android.os.handler.dispatchmessage(handler.java:98)  @ android.os.looper.loop(looper.java:164)  @ android.app.activitythread.main(activitythread.java:6541)  @ java.lang.reflect.method.invoke(native method)  @ com.android.internal.os.zygote$methodandargscaller.run(zygote.java:240)  @ com.android.internal.os.zygoteinit.main(zygoteinit.java:767) 


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