如何显示在我的飞旋我的联系人数据库的价值?(how to show my contacts data

2019-09-22 08:14发布

在我的布局XML我有一个微调,在我的java我有与它接触,有的值的数据库,所以我想知道我是如何发送或把这些值从微调的数据库,所以当我点击它时,它选择接触,代码的任何示例?

Answer 1:

首先从数据库中的联系人的详细信息。 你可以找到数据库概念的示例代码http://codinglookseasy.blogspot.in/2012/08/sqlite-database.html 。 接着从你可能已经得到了对象的ArrayList和设置使用的微调联系人姓名上面的示例

ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
    android.R.layout.simple_spinner_item, list);
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner2.setAdapter(dataAdapter);

凡在此列出可能与您的ArrayList从数据库中的数据。 (存储想要从数据库显示到这个列表中的特定字段)。 获取使用所选项目

spinner2.getSelectedItem() 

这给选择的项目,并从你从数据库中得到了ArrayList的使用数据



Answer 2:

你试一试

//Initialize  the spinner view
Spinner spinnerContact = (Spinnner) findViewById(R.id.spinner);

//Initialise List Variable
List<String> contactsList = databaseObj.getContacts;

// Create and Implement Adapter for spinner
ArrayAdapter<String> contactAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, contactsList );

//set drop down view for spinner
contactAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

//set adapter for spinner
spinnerContact.setAdapter(contactAdapter);

//select the item in spinner defaultly
spinnerContact.setSelection(position);

//get Selected Item Text from the spinner
spinnerContact.getSelectedItem();


Answer 3:

考虑一下你的主要Activty

 public class MainActivity extends Activity {

   private List<String> contactList;
    private Spinner spinnerComp;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.spinnerdemo);
       spinnerComp= (Spinner) findViewById(R.id.spinner1);

    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_spinner_item, getContacts());
    adapter                 .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

    spinnerComp.setAdapter(adapter);

    spinnerComp.setSelection(0);
}

现在getContacts()containsas如下:

// get Contact Names
private List<String> getContacts() {
    // get Contacts
    List<Contact> contacts = DBHelper.getContacts();
    List<String> contactNames = null;
    if (contacts.size() != 0) {
        contactNames = new ArrayList<String>();
        for (Contact contact : Contacts) {
            String contactName = contact.getName();
            contactNames.add(contactName);
        }

    } 
    return contactNames;
}

在DbHelper.java

  public List<Contact> getAllContacts() {
    String sql = "SELECT * FROM " + Table.CONTACT + " ORDER BY " + 
        Contact.Column.NAME + " ASC";

    List<Contact> contacts = new ArrayList<Contact>();
    Cursor cursor = database.rawQuery(sql, null);
    while(cursor.moveToNext()) {
        Contact contact = getContactFromCursor(cursor);
        if(Contact != null) {
            contacts.add(Contact);
        }
    }
    cursor.close();

    return contacts;
}

private Contact getContactFromCursor(Cursor cursor) {
    long id = cursor.getLong(cursor.getColumnIndex(Contact.Column.ID));
    String name = cursor.getString(cursor.getColumnIndex(Contact.Column.NAME));
    long phoneNumber = cursor.getLong(cursor.getColumnIndex(Contact.Column.DATE_OF_BIRTH));
    Contact Contact = new Contact(name, phoneNumber);
    Contact.setId(id);
    return Contact;
}


文章来源: how to show my contacts database value in my spinner?