android-discuss, Problem with a contacts viewer

 Hi,

I'm just getting problems with my app'... and really don't understand
all about that.
When I launch my ListActivity I get : "XContacts has stopped
unexpectedly"

XContacts is just a list view of contacts which are saved in phone.
Here is the code, I hope that I'll get some responses because I'm
thinking that I haven't understood something in documentation...


--
XContacts.java
--
package com.test.xcontacts;

import android.app.ListActivity;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.Contacts.People;
import android.widget.ListAdapter;
import android.widget.SimpleCursorAdapter;

public class XContacts extends ListActivity {
        private String[] _projection = new String[] {
                    People.NAME
                };

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.contacts_list);

        Cursor managedCursor = managedQuery(People.CONTENT_URI,
                                _projection,
                                null,
                                null,
                                People.NAME + " ASC");

        String[] from = new String[] {
                        People.NAME
        };

        int[] to = new int[] {
                        R.id.text1
        };

        ListAdapter contactsAdapter =
                        new SimpleCursorAdapter(this, 
R.layout.contacts_list_row,
managedCursor, from, to);
        setListAdapter(contactsAdapter);
    }
}


--
contacts_list.xml
--
<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android=" http://schemas.android.com/apk/res/ 
android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
  <ListView android:id="@android:id/list"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
  <TextView android:id="@android:id/empty"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/no_contacts"/>

</LinearLayout>


--
contacts_list_row
--
<?xml version="1.0" encoding="UTF-8"?>
<TextView android:id="@+id/text1"
    xmlns:android=" http://schemas.android.com/apk/res/android" ;
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"/>

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Have you looked at the log output (e.g., adb logcat) to see what errors 
you are getting?

-- 
Mark Murphy (a Commons Guy)
 http://commonsware.com 
_The Busy Coder's Guide to Android Development_ Version 1.9 Published!

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 Hmm finally I looked at it and resolved my problem.
That was my projection which causes that.
I just added People._ID and that worked :)

Thanks for your help, and hope that can serve to others having same
problems.





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 Ah you helped me fix it anyway.... Exception browser wasn't showing
any errors so I had nothing to go off of.

My issue was android:id was set to "@+id/list", changed this to
"@android:id/list" and it fixed it.







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 Why even post that you fixed it if you aren't going to give any
details? What a waste of your time _and_ mine. Where did you add the
like People._ID?









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 i have problem with managedQuery ,too.

from document we know Parameters :

uri                The URI of the content provider to query.
projection         List of columns to return.
selection          SQL WHERE clause.
selectionArgs   The arguments to selection, if any ?s are pesent
sortOrder               SQL ORDER BY clause.


i want to query the contact, select  whose name is User and show the
id
how do i write the query string ??

i thought maybe :

 String queryResult[]= new String[] {People._ID};
 String queryStr = People.NUMBER + " is not null and " + People.NAME +
"="+"User";

         Cursor c = getContentResolver().query(
                         People.CONTENT_URI,
                         queryResult,
                         querystr,
                         null,
                         People.DISPLAY_NAME + " asc");

but the error log :

03-05 13:31:52.736: ERROR/DatabaseUtils(90):
android.database.sqlite.SQLiteException: no such column: User: ,
while compiling: SELECT people._id AS _id FROM people LEFT OUTER JOIN
phones ON people.primary_phone=phones._id LEFT OUTER JOIN presence ON
 (presence.person=people._id) WHERE (name=Anderson) ORDER BY
display_name asc

can anyone explain this error log ?

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