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PORetaining items in a List View
 

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    <p>I'm new to android development having some problems. I created a list view that is based on the user input. User has to enter a category in a dialog box and then it's added into the list. Works like a charm. The question is how do I retain those categories once the user exits from an app and starts it again ? When the user starts the app, the list is blank. Do I have to create a preference screen or something to save what the user types ? Here is my code:</p> <pre><code>public class MainActivity extends Activity { final Context context = this; ArrayAdapter&lt;String&gt; arrayAdapter; ArrayList&lt;String&gt; listItems = new ArrayList&lt;String&gt;(); ListView lv; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); lv = (ListView)findViewById(R.id.listView1); arrayAdapter = new ArrayAdapter&lt;String&gt;(this,android.R.layout.simple_list_item_1, listItems); lv.setAdapter(arrayAdapter); } @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 boolean onOptionsItemSelected(MenuItem item) { switch(item.getItemId()){ case R.id.menu_add_cat: LayoutInflater li = LayoutInflater.from(context); View promptAdd = li.inflate(R.layout.prompt_add, null); AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(context); //set prompts.xml to alertDialogBuilder alertDialogBuilder.setView(promptAdd); final EditText etAddCat = (EditText)promptAdd.findViewById(R.id.etDialogInput); //set a dialog message alertDialogBuilder.setPositiveButton("Done", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { /* * add a cat here */ String input = etAddCat.getText().toString(); if(null != input &amp;&amp; input.length() &gt; 0){ listItems.add(input); arrayAdapter.notifyDataSetChanged(); }else{ Toast.makeText(getApplicationContext(), "Please enter a new category", Toast.LENGTH_LONG).show(); } } }) .setNegativeButton("Cancel", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.cancel(); } }); // create alert dialog AlertDialog alertDialog = alertDialogBuilder.create(); // show it alertDialog.show(); break; } //return super.onOptionsItemSelected(item); return true; } }// end of MainActivity </code></pre>
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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