如何显示在Android列表视图数据库内容？ [英] How to display database content on android Listview?

问题描述

我在联络簿一样application.I工作有一个数据库，并且我想在ListView中显示的数据。谁能告诉我如何实现这一目标？下面是我到目前为止已经试过，

I am working on a contact book like application.I have a database and,I want to display the data in ListView. Can anybody tell me how to achieve this? Below is what I have tried so far,

public class Contacts {

    private int id;
    private String name;
    private String phone_number;
    private String email;


    public Contacts()
    {

    }

    public Contacts(int id, String name, String phone_number, String email) 
    {
        this.id = id;
        this.name = name;
        this.phone_number = phone_number;
        this.email = email;
    }

    public Contacts(String name, String phone_number, String email) 
    {
        this.name = name;
        this.phone_number = phone_number;
        this.email = email;
    }

    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 getPhone_number() {
        return phone_number;
    }
    public void setPhone_number(String phone_number) {
        this.phone_number = phone_number;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getEmail() {
        return email;
    }

}

public class DatabaseHandler extends SQLiteOpenHelper {

    private static final int DATABASE_VERSION = 2;
    private static final String DATABASE_NAME = "ContactsManager";
    private static final String TABLE_CONTACTS = "contacts";

    private static final String KEY_ID = "id";

    private static final String KEY_NAME = "name";

    private static final String KEY_PH_NO = "phone_number";

    private static final String KEY_EMAIL = "email";


    public DatabaseHandler(Context context) {

        super( context, DATABASE_NAME, null, DATABASE_VERSION);
        // TODO Auto-generated constructor stub
    }


    @Override
    public void onCreate(SQLiteDatabase db) {
        // TODO Auto-generated method stub

        String CREATE_CONTACTS_TABLE = "CREATE TABLE " + TABLE_CONTACTS + "("

        + KEY_ID + " INTEGER PRIMARY KEY," + KEY_NAME + " TEXT,"

        + KEY_PH_NO + " TEXT," + KEY_EMAIL + " TEXT" + ")";

        db.execSQL(CREATE_CONTACTS_TABLE);

    }


    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO Auto-generated method stub

        db.execSQL("DROP TABLE IF EXISTS " + TABLE_CONTACTS);

        onCreate(db);

    }


    public void insertContact(Contacts contacts) 
    {

        SQLiteDatabase db = this.getWritableDatabase();



        ContentValues cv = new ContentValues();

        cv.put(KEY_NAME, contacts.getName()); // Contact Name

        cv.put(KEY_PH_NO, contacts.getPhone_number()); // Contact Phone

        cv.put(KEY_EMAIL, contacts.getEmail()); //Contact  Email



        // Inserting Row

        db.insert(TABLE_CONTACTS, null, cv);

        db.close();

    }


    // Getting All Contacts

    public List<Contacts> getAllContacts() 
    {

    List<Contacts> contactList = new ArrayList<Contacts>();

    // Select All Query

    String selectQuery = "SELECT  * FROM " + TABLE_CONTACTS;



    SQLiteDatabase db = this.getWritableDatabase();

    Cursor cursor = db.rawQuery(selectQuery, null);




    // looping through all rows and adding to list

    if (cursor.moveToFirst()) 
    {

    do {

    Contacts contact = new Contacts();

    //contact.setId(Integer.parseInt(cursor.getString(0)));

    contact.setName(cursor.getString(1));

    contact.setPhone_number(cursor.getString(2));

    contact.setEmail(cursor.getString(3));

    // Adding contact to list

    contactList.add(contact);

    } 
    while (cursor.moveToNext());

    }



    // return contact list


    return contactList;
    }
}

public class View_data extends ListActivity {

    DatabaseHandler db = new DatabaseHandler(this);
    Cursor c ;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_view_data);



        db.getWritableDatabase();

        List<Contacts> values = db.getAllContacts();

        ArrayAdapter<Contacts> adapter = new ArrayAdapter<Contacts>(this,
                android.R.layout.simple_list_item_1, values);
            setListAdapter(adapter);

          }




    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.view_data, menu);
        return true;
    }

}

在 View_data 类，我试图显示的数据，但不能做到这一点。
任何建议将高​​度AP preciated。

In View_data class i tried to display the data but couldn't do it. Any Suggestion will be highly appreciated.

推荐答案

试试这个：

您可以使用

的http://dj-android.blogspot.in/2012/10/android-show-data-from-sqlite-db-into.html

和得到解决。在此，你必须只使用ListView控件代替GridView的。

and get solution.. In this you have to just use ListView instead of GridView.

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