android - how to implement a button with a tab activity -



android - how to implement a button with a tab activity -

i have tab activity , in 1 of activities want place button take different activity. when code button (getting no errors) when launching app crashes error code:

11-14 12:50:43.783: e/androidruntime(10933): java.lang.runtimeexception: unable start activity componentinfo{com.dist.distguide/com.dist.distguide.mainactivity}: java.lang.nullpointerexception

however when remove button coding app launches fine.

here xml file:

<?xml version="1.0" encoding="utf-8"?> <tabhost xmlns:android="http://schemas.android.com/apk/res/android" android:id="@android:id/tabhost" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@drawable/logo1"> <linearlayout android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" android:padding="5dp"> <tabwidget android:id="@android:id/tabs" android:layout_width="fill_parent" android:layout_height="wrap_content" /> <framelayout android:id="@android:id/tabcontent" android:layout_width="fill_parent" android:layout_height="fill_parent" android:padding="5dp" > <button android:id="@+id/distancecalc" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="distance calculator" /> <button android:id="@+id/distance" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="distance calculator" /> </framelayout> </linearlayout> </tabhost>

and java:

intent intenthome = new intent().setclass(this, homeactivity.class); tabspec tabspechome = tabhost .newtabspec("home") .setindicator("", ressources.getdrawable(r.drawable.icon_home_config)) .setcontent(intenthome); button add together = (button)findviewbyid(r.id.distance1); add.bringtofront(); add.setonclicklistener(new view.onclicklistener() { public void onclick(view v) { intent myintent = new intent(mainactivity.this,distancecalc.class); startactivity(myintent); } });

what doing wrong here? please help! give thanks you

change

button add together = (button)findviewbyid(r.id.distance1);

to

button add together = (button)findviewbyid(r.id.distancecalc);

your button id distancecalc. , you're trying initialize distance1.

android android-intent

Comments

Post a Comment

Popular posts from this blog

Delphi change the assembly code of a running process -

Delphi change the assembly code of a running process - i'm trying alter address 00741fa5 has push test.009e721c . alter push test.009e71c8 . procedure callback; asm force $9e71c8 end; procedure tform2.btn1click(sender: tobject); var ppid :dword; pprocess : cardinal; begin getwindowthreadprocessid(findwindow(nil,pchar('test')), @ppid); pprocess := openprocess(process_all_access, false, ppid); injectasm(pprocess, $741fa5, 10, integer(@callback), 0); end; here injectasm function (with error checking) function injectasm(process: longword; injectaddress, injectsize, codeaddress, codesize : integer): pointer; var csize, rsize : integer; replaced : array of byte; jmp : array [0..4] of byte; jmpaddress : integer; nopv : byte; : integer; nbr: ulong_ptr; begin //injectsize must equal or greater 5, because need space our //(far) jmp wwxxyyzz instruction //if there's no space, inject in place of few instructions if injectsize ...
Read more

json - Hibernate and Jackson (java.lang.IllegalStateException: Cannot call sendError() after the response has been committed) -

json - Hibernate and Jackson (java.lang.IllegalStateException: Cannot call sendError() after the response has been committed) - hello have problem hibernate , jackson. have 2 pojos @entity @table(name = "users") public class user implements serializable { static final long serialversionuid = 4235637833262722256l; @id @generatedvalue private int id; @column(name = "creation_date") private date creationdate; @column(name = "first_name") private string firstname; @column(name = "last_name") private string lastname; @version @column(name = "version") private int version; @column(name = "e_mail") private string email; @column(name = "enabled") private boolean enabled; @column(name = "login") private string login; @column(name = "password") private string password; @jsonmanagedreference("role") @onetomany(mappedby = "user", cascade = cascadetype.all,fetch = fetchtyp...
Read more

C++ 11 "class" keyword -

C++ 11 "class" keyword - i've started using c++ 11 little bit more , have few questions on special uses of class keyword. know it's used declare class, there's 2 instances have seen don't understand: method<class t>(); and class class_name *var; why precede typename keyword class in first example, , keyword pointer in sec example? that known elaborated type specifier , necessary when class name "shadowed" or "hidden" , need explicit. class t { }; // love of god don't t t; t t2; if compiler smart, give these warnings: main.cpp:15:5: error: must utilize 'class' tag refer type 't' in scope t t2; ^ class main.cpp:14:7: note: class 't' hidden non-type declaration of 't' here t t; ^ if class not defined, deed forwards declaration. for example: template <typename t> void method() { using type = typename t::value_type; } method...
Read more