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POHow to Refresh Android List Adapter, so it shows new-added items
 

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  1. POHow to Refresh Android List Adapter, so it shows new-added items
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    <p>I was working on a project. It's just showing a list of tasks and Adding new tasks to it. I have 3 CLASSES. One for adding, One for view and One to hold all information (or so I think).</p> <p>I have 2 tasks in my List already, and they are shown properly. </p> <p>The problem is, when I <strong>add</strong> a new task it won't show them in view. I have tried many possible solutions:</p> <ul> <li><p>simply adding item to list</p></li> <li><p>creating a new list that consists items from old one and rebuilding adapter;</p></li> <li><p>using <code>notifyDataSetChanged();</code> alongside with add() command;</p></li> <li><p>etc.</p></li> </ul> <p>Here is my code, it's a bit messy, but I hope you will figure it out.</p> <p><strong>AndroidListAdapterActivity class:</strong></p> <pre><code>public class AndroidListAdapterActivity extends ListActivity { /** Called when the activity is first created. */ Button b1; Lista o; ArrayAdapter aa; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); b1=(Button)findViewById(R.id.add); Log.w("POC", "PA OVO SE ZOVE SVAKI PUT"); o=new Lista(); o.lis.add("S1"); o.lis.add("S2"); aa = new ArrayAdapter&lt;String&gt;(this, android.R.layout.simple_spinner_item, o.lis); setListAdapter(aa); b1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent i = new Intent(AndroidListAdapterActivity.this, Dodavanje.class); startActivity(i); } }); } @Override public void onResume(){ super.onResume(); aa.notifyDataSetChanged(); if(o.broj&gt;=2){ aa=new ArrayAdapter&lt;String&gt;(this,android.R.layout.simple_spinner_item, o.lis2); setListAdapter(aa); Log.w("myApp", "CALLED TOO"); } String yt=String.valueOf(o.ses); Log.w("teras", yt); aa.notifyDataSetChanged(); Log.w("myApp", "CaLLED!!!!!!!!!!!!!"); String fx= String.valueOf(o.broj); Log.w("myAPPe", fx); } @Override protected void onPause() { // TODO Auto-generated method stub super.onPause(); } } </code></pre> <p><strong>Dodavanje (Adding):</strong></p> <pre><code>public class Dodavanje extends Activity { Button but; Button but2; EditText et; Lista o; AndroidListAdapterActivity www; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.dodavanje); but= (Button)findViewById(R.id.bb); but2= (Button)findViewById(R.id.bc); et=(EditText)findViewById(R.id.tt); www=new AndroidListAdapterActivity(); o = new Lista(); but.setOnClickListener(new View.OnClickListener() { @SuppressWarnings("unchecked") @Override public void onClick(View arg0) { String t1= et.getText().toString(); //o.lis.add(t1); o.lis2.addAll(o.lis); o.lis2.add(t1); o.lis.add(t1); o.ses=true; Log.w("IZVJESTAJ: ", String.valueOf(o.ses)); o.broj++; String fx=String.valueOf(o.broj); Log.w("Izbacaj",fx); et.setText(""); } }); but2.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { finish(); } }); } } </code></pre> <p><strong>Lista (list):</strong></p> <pre><code>public class Lista extends Application { ArrayList&lt;String&gt; lis=new ArrayList&lt;String&gt;(); ArrayList&lt;String&gt; lis2=new ArrayList&lt;String&gt;(); int broj =1; boolean ses= false; } </code></pre>
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