练习代码 3-2 《安卓应用开发揭秘》

public  void onCreate(Bundle savedInstanceState)
    {
        TextView tv =  new TextView( this);
        String string = "";        
         super.onCreate(savedInstanceState);    
         // 得到ContentResolver对象
        ContentResolver cr = getContentResolver();  
         // 取得电话本中开始一项的光标
        Cursor cursor = cr.query(ContactsContract.Contacts.CONTENT_URI,  null,  null,  null,  null);
         while(cursor.moveToNext())
        { 
             try{
                 int idColumn  = cursor.getColumnIndex(ContactsContract.Contacts._ID); 
                String contactId = cursor.getString(idColumn);   
                 // 取得联系人名字
                 int nameFieldColumnIndex = cursor.getColumnIndex(PhoneLookup.DISPLAY_NAME);
                String contact = cursor.getString(nameFieldColumnIndex); 
                 // 取得电话号码
                String phoneNumber = ""; 
                 // 取得该联系人，电话数量
                 int phoneCount = cursor.getInt(cursor.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER));   
                 if(phoneCount>0){   
                     // 获得联系人的电话号码   
                    Cursor phones = getContentResolver().query(
                            ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,
                            ContactsContract.CommonDataKinds.Phone.CONTACT_ID+ " = " + contactId,
                             null,  null);   
                     if(phones.moveToFirst()){
                         do{   
                             // 遍历所有的电话号码   
                            phoneNumber += phones.getString(phones.getColumnIndex(
                                    ContactsContract.CommonDataKinds.Phone.NUMBER)) + "\t";   
                            System.out.println(phoneNumber);   
                        } while(phones.moveToNext());   
                    }
                }
                string += contact + ":" + phoneNumber +"\n";
            } catch(Exception ex){
                ex.printStackTrace();
            }
            
             // cursor.moveToNext();
        }
        cursor.close();
         // 设置TextView显示的内容
        tv.setText(string);
         // 显示到屏幕
        setContentView(tv);
    }