android sqlite无法读取数据：报错

public List<person> findall() {
SQLiteDatabase db = helper.getReadableDatabase();
List<person> persons = new ArrayList<person>();
// Cursor cursor = db.rawQuery("select * from person", null);
Cursor cursor = db.query("person", new String[] { "name", "id",
"number" }, null, null, null, null, null);
while (cursor.moveToNext()) {
int id = cursor.getInt(cursor.getColumnIndex("id"));
String name = cursor.getString(cursor.getColumnIndex("name"));
String number = cursor.getString(cursor.getColumnIndex("number"));
person p = new person(id, name, number);
persons.add(p);
}
cursor.close();
db.close();
return persons;

}

以上是查找findall的代码 

public void testfindall() throws Exception {
persondao2 dao = new persondao2(getContext());
List<person> persons = dao.findall();
for (person p : persons) {
System.out.println(p.toString());
}
}

这是测试代码 

我确认数据库里有数据 我用第三方软件查看 可以看到数据库的内容 但是利用测试代码读取出来的是这样

刚学android开发 求大神帮看看哪里出了问题 

domain的代码如下

package com.example.domain;


public class person {
private int id;
private String name;
private String number;

public person() {
}

public person(int id, String name, String number) {
this.id = id;
this.name = name;
this.number = number;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getNumber() {
return number;
}
public void setNumber(String number) {
this.number = number;
}



}