Add Items to ListView - Android

Question

This is my first experience with android  I m trying to add items to my ListView  I use Tabs  and the only way to see that the item was added is to change tab and then come back to the first tab   I searched around  and I ve always found  adapter notifyDataSetChanged      but doesn t work for me   I have created the project with  as I said  Fixed Tabs   Swipe  I simply want to have listviews which rows have an EditText  a Spinner and a Button  On the bottom of the Fragment used for the tab  I have an ImageButton  I want to click on it and have a new Row   my custom Adapter   package com andreapivetta uconverter   import java util ArrayList   import android content Context  import android view LayoutInflater  import android view View  import android view ViewGroup  import android widget ArrayAdapter   public class CustomAdapter extends ArrayAdapter lt String gt    private final Context context  private final int resourceID       public CustomAdapter Context context  int resource  ArrayList lt String gt  bah            super context  resource  bah            this context   context          this resourceID   resource              Override     public View getView int position  View convertView  ViewGroup parent            LayoutInflater inflater    LayoutInflater  context getSystemService Context LAYOUT INFLATER SERVICE           View rowView   inflater inflate resourceID  parent  false            return rowView            fragment main dummy xml   lt RelativeLayout xmlns android  http   schemas android com apk res android  xmlns tools  http   schemas android com tools  android layout width  match parent  android layout height  match parent  android paddingBottom   dimen activity vertical margin  android paddingLeft   dimen activity horizontal margin  android paddingRight   dimen activity horizontal margin  android paddingTop   dimen activity vertical margin  tools context   MainActivity DummySectionFragment   gt    lt ListView     android id    id unitListView      android layout width  match parent      android layout height  wrap content   gt   lt  ListView gt    lt ImageButton     android id    id moreImageButton      android layout width  wrap content      android layout height  wrap content       android layout alignParentBottom  true      android layout alignParentRight  true       android contentDescription   string image button delete      android src   android drawable ic input add    gt    lt  RelativeLayout gt    Row xml   lt  xml version  1 0  encoding  utf-8   gt   lt RelativeLayout xmlns android  http   schemas android com apk res android              android layout width  match parent              android layout height  match parent  gt    lt TextView     android id    id textView1      android layout width  wrap content      android layout height  wrap content      android layout alignParentLeft  true      android layout alignParentTop  true    gt    lt EditText     android id    id unitEditText      android layout width  wrap content      android layout height  wrap content      android layout alignParentLeft  true      android layout below    id textView1      android ems  10      android inputType  numberDecimal   gt        lt requestFocus   gt   lt  EditText gt    lt Spinner     android id    id unitSpinner      android layout width  wrap content      android layout height  wrap content      android layout alignBottom    id imageButton1      android layout marginBottom  15dp      android layout toRightOf    id unitEditText    gt    lt ImageButton     android id    id imageButton1      android layout width  wrap content      android layout height  wrap content      android layout alignBottom    id unitEditText      android layout alignParentRight  true       android onClick  removeItem       android contentDescription   string image button delete      android src   android drawable ic menu delete    gt    lt  RelativeLayout gt    MainActivity     public class MainActivity extends FragmentActivity implements     ActionBar TabListener           The   link android support v4 view PagerAdapter  that will provide    fragments for each of the sections  We use a      link android support v4 app FragmentPagerAdapter  derivative  which    will keep every loaded fragment in memory  If this becomes too memory    intensive  it may be best to switch to a      link android support v4 app FragmentStatePagerAdapter       SectionsPagerAdapter mSectionsPagerAdapter          The   link ViewPager  that will host the section contents      ViewPager mViewPager     Override protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState       setContentView R layout activity main           Set up the action bar      final ActionBar actionBar   getActionBar        actionBar setNavigationMode ActionBar NAVIGATION MODE TABS           Create the adapter that will return a fragment for each of the three        primary sections of the app      mSectionsPagerAdapter   new SectionsPagerAdapter getSupportFragmentManager             Set up the ViewPager with the sections adapter      mViewPager    ViewPager  findViewById R id pager       mViewPager setAdapter mSectionsPagerAdapter           When swiping between different sections  select the corresponding        tab  We can also use ActionBar Tab select   to do this if we have        a reference to the Tab      mViewPager              setOnPageChangeListener new ViewPager SimpleOnPageChangeListener                      Override                 public void onPageSelected int position                        actionBar setSelectedNavigationItem position                                             For each of the sections in the app  add a tab to the action bar      for  int i   0  i  lt  mSectionsPagerAdapter getCount    i                 Create a tab with text corresponding to the page title defined by            the adapter  Also specify this Activity object  which implements            the TabListener interface  as the callback  listener  for when            this tab is selected          actionBar addTab actionBar newTab                    setText mSectionsPagerAdapter getPageTitle i                    setTabListener this              Override public boolean onCreateOptionsMenu Menu menu           Inflate the menu  this adds items to the action bar if it is present      getMenuInflater   inflate R menu main  menu       return true      Override public void onTabSelected ActionBar Tab tab          FragmentTransaction fragmentTransaction           When the given tab is selected  switch to the corresponding page in        the ViewPager      mViewPager setCurrentItem tab getPosition         Override public void onTabUnselected ActionBar Tab tab          FragmentTransaction fragmentTransaction        Override public void onTabReselected ActionBar Tab tab          FragmentTransaction fragmentTransaction              A   link FragmentPagerAdapter  that returns a fragment corresponding to    one of the sections tabs pages      public class SectionsPagerAdapter extends FragmentPagerAdapter        public SectionsPagerAdapter FragmentManager fm            super fm               Override     public Fragment getItem int position               getItem is called to instantiate the fragment for the given page             Return a DummySectionFragment  defined as a static inner class            below  with the page number as its lone argument          Fragment fragment   new DummySectionFragment            Bundle args   new Bundle            args putInt DummySectionFragment ARG SECTION NUMBER  position   1           fragment setArguments args           return fragment              Override     public int getCount                Show 4 total pages          return 4              Override     public CharSequence getPageTitle int position            Locale l   Locale getDefault            switch  position            case 0              return getString R string title section1  toUpperCase l           case 1              return getString R string title section2  toUpperCase l           case 2              return getString R string title section3  toUpperCase l           case 3              return getString R string title section4  toUpperCase l                     return null                  A dummy fragment representing a section of the app  but that simply    displays dummy text      public static class DummySectionFragment extends Fragment                  The fragment argument representing the section number for this        fragment              ArrayList lt String gt  myStringArray1    new ArrayList lt String gt      new String    Egzo   Eg   Egzona        String   myStringArray2   new String    aaa   bbb   ccc        String   myStringArray3   new String    ddd   eeee        String   myStringArray4   new String    Cia   ci   Ciao        public static ArrayAdapter lt String gt  adapter       public static final String ARG SECTION NUMBER    section number        public DummySectionFragment                 Override     public View onCreateView LayoutInflater inflater  ViewGroup container Bundle savedInstanceState            View rootView   inflater inflate R layout fragment main dummy container  false             TextView dummyTextView    TextView  rootView findViewById R id section label             dummyTextView setText Integer toString getArguments   getInt ARG SECTION NUMBER                 ListView         ListView unitListView    ListView  rootView findViewById R id unitListView            switch getArguments   getInt ARG SECTION NUMBER             case 1              myStringArray1 add  mmm                 adapter   new CustomAdapter getActivity    R layout row  myStringArray1               unitListView setAdapter adapter               break          case 2              adapter   new ArrayAdapter lt String gt  getActivity    R layout row  R id textView1  myStringArray2               unitListView setAdapter adapter               break          case 3              adapter   new ArrayAdapter lt String gt  getActivity    R layout row  R id textView1  myStringArray3               unitListView setAdapter adapter               break          case 4              adapter   new ArrayAdapter lt String gt  getActivity    R layout row  R id textView1  myStringArray4               unitListView setAdapter adapter               break                    unitListView setOnItemClickListener listViewOnClickListener               ImageButton         ImageButton moreImageButton    ImageButton  rootView findViewById R id moreImageButton           moreImageButton setOnClickListener moreListener             return rootView             public OnClickListener moreListener   new OnClickListener              Override         public void onClick View v                   TODO Auto-generated method stub              myStringArray1 add  Andrea                adapter clear                adapter addAll myStringArray1               adapter notifyDataSetChanged                           public OnItemClickListener listViewOnClickListener   new OnItemClickListener               Override         public void onItemClick AdapterView lt   gt  arg0  View arg1  int arg2                  long arg3                   TODO Auto-generated method stub                           Note that I m working only with the first tab right now     What am I doing wrong

User · Answer

Try this one it will work  public class Third extends ListActivity   private ArrayAdapter lt String gt  adapter  private List lt String gt  liste   Override protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState       setContentView R layout activity third        String   values   new String      Android    iPhone    WindowsMobile                    Blackberry    WebOS    Ubuntu    Windows7    Max OS X                    Linux    OS 2          liste   new ArrayList lt String gt          Collections addAll liste  values        adapter   new ArrayAdapter lt String gt  this                  android R layout simple list item 1  liste        setListAdapter adapter       Override   protected void onListItemClick ListView l  View v  int position  long id         liste add  Nokia         adapter notifyDataSetChanged

User · Answer

public OnClickListener moreListener   new OnClickListener           Override       public void onClick View v              adapter add  aaaa

User · Answer

ListView myListView    ListView  rootView findViewById R id myListView   ArrayList lt String gt  myStringArray1   new ArrayList lt String gt     myStringArray1 add  something    adapter   new CustomAdapter getActivity    R layout row  myStringArray1   myListView setAdapter adapter     Try it like this  public OnClickListener moreListener   new OnClickListener           Override     public void onClick View v            adapter   null          myStringArray1 add  Andrea            adapter   new CustomAdapter getActivity    R layout row  myStringArray1           myListView setAdapter adapter           adapter notifyDataSetChanged

[java] Add Items to ListView - Android

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