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POApp crashes when opening a class which contains a ListView
 

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  1. POApp crashes when opening a class which contains a ListView
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    <p>I have the following class which as you can see contains a EditText, Button and list. I want the user to type in the EditText some text,click Search and Show up the results from </p> <pre><code>SQLite database in the list below the button/edittext field. public class FindOrder extends ListActivity { private List&lt;String&gt; arr; private ListView listView; Button search; EditText search_field; String search_val; SQLiteDatabase db = null; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.find_order); // TODO Auto-generated method stub Log.e("myTag","in func"); search = (Button) findViewById(R.id.search_button); search_field = (EditText) findViewById(R.id.search_field); search.setOnClickListener( new View.OnClickListener() { public void onClick(View view) { search_val=search_field.getText().toString(); //getOrder(search_val); } }); } public void getOrder(String val) { Log.e("myTag","in func"); String query; String[] s_arr = new String[1]; listView = (ListView) findViewById(R.id.listView); ArrayAdapter&lt;String&gt; adapter; arr = new ArrayList&lt;String&gt;(); db = this.openOrCreateDatabase( "DBname", MODE_PRIVATE, null); query="SELECT OrderName, OrderLink, DateYear, DateMonth, DateDay, OrderPrice FROM Orders where OrderName=?"; s_arr[0]=val; Cursor c = db.rawQuery(query, s_arr); if (c != null ) { if (c.moveToFirst()) { do { arr.add(c.getString(c.getColumnIndex(DatabaseHelper.colName))); Log.e("myTag",c.getString(c.getColumnIndex(DatabaseHelper.colName))); } while (c.moveToNext()); } } c.close(); //setListAdapter(new ArrayAdapter&lt;String&gt;(this, android.R.layout.simple_list_item_1,arr)); adapter = new ArrayAdapter&lt;String&gt;(this,android.R.layout.simple_list_item_1, arr); listView.setAdapter(adapter); TextView textview = new TextView(this); LinearLayout ll2 = (LinearLayout)findViewById(R.id.linearLayout2); ll2.addView(textview); } } </code></pre> <p>Currently whenever i click on the button in Main Menu which leads to this activity, i get an FC. One of the errors i can see i the log is :</p> <pre><code>06-02 10:32:18.387: E/AndroidRuntime(1904): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.Sagi.MyOrders/com.Sagi.MyOrders.FindOrder}: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list' </code></pre> <p>Together with many other errors . <strong>But i couldn't really understand why should i have .list attribute ...</strong></p> <p>XML :</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" &gt; &lt;LinearLayout android:id = "@+id/linearLayout1" android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="wrap_content"&gt; &lt;EditText android:id="@+id/search_field" android:layout_width="wrap_content" android:layout_height="wrap_content" android:ems="10" &gt; &lt;/EditText&gt; &lt;Button android:id="@+id/search_button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Search" /&gt; &lt;/LinearLayout&gt; &lt;LinearLayout android:id = "@+id/linearLayout2" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="wrap_content"&gt; &lt;/LinearLayout&gt; &lt;ListView android:id="@+id/listView" android:layout_width="fill_parent" android:layout_height="wrap_content"/&gt; &lt;/LinearLayout&gt; </code></pre> <p><strong>Thanks !</strong></p>
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    1. USShankar Agarwal
    1. USSagiLow
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