查询SIM里的联系人报空指针错误

查询SIM里的联系人报空指针异常
public class ContactsActivity extends Activity {
private TelephonyManager cTelephonyManager;
private String strSim;
private ListView contacts_lv;
private TextView contacts_item_id;
private TextView contacts_item_surname;
private TextView contacts_item_number;

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.contacts);

contacts_lv = (ListView) this.findViewById(R.id.contacts_lv);
getSimState();
// showContacts();
contacts_lv = (ListView) this.findViewById(R.id.contacts_lv);
Uri uri = Uri.parse("content://icc/adn");
String[] projection = { "_id", "name", "number" };
Cursor cur = getContentResolver().query(uri, projection, null, null,
null);
SimpleCursorAdapter sca = new SimpleCursorAdapter(this,
R.layout.contacts_item, cur, projection, new int[] {
R.id.contacts_item_id, R.id.contacts_item_surname,
R.id.contacts_item_number });
contacts_lv.setAdapter(sca);

}
}
原来的时候还是可以查的，我现在activity就只写那么多来测试，也照样包空指针异常，
log显示 Cursor cur = getContentResolver().query(uri, projection, null, null, 这行空指针，我检查了uri对的，projection也对的，都不知道错在哪了。

------解决方案--------------------
我运行了

Java code

Uri uri = Uri.parse("content://icc/adn");String[] projection = { "_id", "name", "number" };Cursor cur = getContentResolver().query(uri, projection, null, null,null);