java - App has stopped - ProgressBar in Android -

friends. started learn android app developinng android studio , java. trying make 1 progressbar. when app started have 2 edittext fields first 100 default(how max value progressbar ) , 1 edittext field increment by(this step) progressbar. when click start must show via dialog.

i write code, there no more errors, app closing when hit start button. progressbar not working

this code: activity_main.xml

<?xml version="1.0" encoding="utf-8"?>  <linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     android:orientation="vertical"     android:layout_width="fill_parent"     android:layout_height="fill_parent" >      <textview         android:id="@+id/txt_max"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="max value" />     <edittext         android:id="@+id/maximum"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="100.0" />     <textview         android:id="@+id/txt_increment"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="increment by"/>     <edittext         android:id="@+id/increment"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="5.0" />     <button         android:id="@+id/butt_start"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="start" /> </linearlayout> 

this mainactivity.java:

public class mainactivity extends appcompatactivity {     int increment;     progressdialog dialog;     @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);          button startbutton = (button) findviewbyid(r.id.butt_start);         startbutton.setonclicklistener(new view.onclicklistener()         {             public void onclick(view view)             {                 edittext et = (edittext) findviewbyid(increment);                 increment = integer.parseint(et.gettext().tostring());                 dialog = new progressdialog(mainactivity.this);                 dialog.setcancelable(true);                 dialog.setmessage("loading...");                 dialog.setprogressstyle(progressdialog.style_horizontal);                 dialog.setprogress(0);                 edittext max = (edittext) findviewbyid(r.id.maximum);                 int maximum = integer.parseint(max.gettext().tostring());                 dialog.setmax(maximum);                 dialog.show();                 thread background = new thread(new runnable()                 {                     public void run()                     {                         try                         {                             while (dialog.getprogress() <= dialog.getmax())                             {                                 thread.sleep(500);                                 progresshandler.sendmessage(progresshandler.obtainmessage());                             }                         } catch (java.lang.interruptedexception e)                         {                          }                     }                 });                 background.start();             }                  handler progresshandler = new handler() {                     public void handlemessage(message msg) {                         dialog.incrementprogressby(increment);                     }                 };          });         }  } 

there error code.. comment each reporting snippet:

public class mainactivity extends appcompatactivity {     int increment;     progressdialog dialog;     @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);          button startbutton = (button) findviewbyid(r.id.butt_start);         startbutton.setonclicklistener(new view.onclicklistener()         {             public void onclick(view view)             {                 edittext et = (edittext) findviewbyid(increment); 

here first error: not wrong thing, it's better istantiate edittext in oncreate (outside onclick), because way re-create edittext every time click button.

the error double: using findviewbyid(increment) where, in code, increment int variable value 0. have use (as did button)

findviewbyid(r.id.increment); 

going on:

                increment = integer.parseint(et.gettext().tostring());                 dialog = new progressdialog(mainactivity.this);                 dialog.setcancelable(true);                 dialog.setmessage("loading...");                 dialog.setprogressstyle(progressdialog.style_horizontal);                 dialog.setprogress(0);                 edittext max = (edittext) findviewbyid(r.id.maximum);                 int maximum = integer.parseint(max.gettext().tostring()); 

here error xml side: since assuming max.gettext().tostring() integer, add inputtype xml number value.

                dialog.setmax(maximum);                 dialog.show();                 thread background = new thread(new runnable()                 {                     public void run()                     {                         try                         {                             while (dialog.getprogress() <= dialog.getmax())                             {                                 thread.sleep(500);                                 progresshandler.sendmessage(progresshandler.obtainmessage());                             }                         } catch (java.lang.interruptedexception e)                         {                          }                     }                 });                 background.start();             }                  handler progresshandler = new handler() {                     public void handlemessage(message msg) {                         dialog.incrementprogressby(increment);                     }                 };          });         }  } 

another thing is better avoid naming variable same name of id, expecially because id should representative of control pointing @ (for example call "edittextmaxvaluemainactivity", limit example representative).

if can suggest you, thenewboston channel/site best tutorials, has couple of playlist android basics advanced , simple , explicative. luck!

for other errors, need logtrace