Question

在登录页面后，我想要显示A代表Apple，B代表男孩......等待F..in listview。但在我的应用程序中我完全登录成功只有登录表完全成功创建但是mainmenu没有创建..我想在测试数据库中创建mainmenu表之后我想从mainmenu表获取数据到android中的listview

      i try this code
      if(username.length()>0&&password.length()>0)
        {
            SQLiteAdapter db=new SQLiteAdapter(Main.this);
            db.openToWrite();
            if(db.Login(username,password))
            {
                System.out.println("goutham");
                Intent intent=new Intent(getApplicationContext(),ExampleActivity.class);

                startActivity(intent);
            }

SQLiteAdapter.java

           public class SQLiteAdapter {

public static final String MYDATABASE_NAME = "test";
public static final String KEY_USERNAME = "username";
public static final String KEY_PASSWORD = "password";
public static final String MYDATABASE_TABLE = "mainmenu";
private static final String DATABASE_TABLE = "login";
public static final int MYDATABASE_VERSION = 1;
public static final String KEY_ID = "_id";
public static final String KEY_CONTENT = "Content";

// create table MY_DATABASE (ID integer primary key, Content text not null);
private static final String SCRIPT_CREATE_DATABASE = "create table "
        + MYDATABASE_TABLE + " (" + KEY_ID
        + " integer primary key autoincrement, " + KEY_CONTENT
        + " text not null);";
private static final String DATABASE_CREATE = "create table login (_id integer primary key autoincrement, "
        + "username text not null, " + "password text not null);";

private SQLiteHelper sqLiteHelper;
private SQLiteDatabase sqLiteDatabase;

private Context context;

public SQLiteAdapter(Context c) {
    context = c;
}

public SQLiteAdapter openToRead() throws android.database.SQLException {
    sqLiteHelper = new SQLiteHelper(context, MYDATABASE_NAME, null,
            MYDATABASE_VERSION);
    sqLiteDatabase = sqLiteHelper.getReadableDatabase();
    return this;
}

public SQLiteAdapter openToWrite() throws android.database.SQLException {
    sqLiteHelper = new SQLiteHelper(context, MYDATABASE_NAME, null,
            MYDATABASE_VERSION);
    sqLiteDatabase = sqLiteHelper.getWritableDatabase();
    return this;
}

public void close() {
    sqLiteHelper.close();
}

public long insert(String content) {

    ContentValues contentValues = new ContentValues();
    contentValues.put(KEY_CONTENT, content);
    return sqLiteDatabase.insert(MYDATABASE_TABLE, null, contentValues);
}

public int deleteAll() {
    return sqLiteDatabase.delete(MYDATABASE_TABLE, null, null);

}

public Cursor queueAll() {
    String[] columns = new String[] { KEY_ID, KEY_CONTENT };
    Cursor cursor = sqLiteDatabase.query(MYDATABASE_TABLE, columns, null,
            null, null, null, null);

    return cursor;
}

private static class SQLiteHelper extends SQLiteOpenHelper {

    public SQLiteHelper(Context context, String name,
            CursorFactory factory, int version) {
        super(context, name, factory, version);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        // TODO Auto-generated method stub
        db.execSQL(SCRIPT_CREATE_DATABASE);
        db.execSQL(DATABASE_CREATE);
    }

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

    }

}

public long AddUser(String username, String password) {
    ContentValues initialValues = new ContentValues();
    initialValues.put(KEY_USERNAME, username);
    initialValues.put(KEY_PASSWORD, password);
    return sqLiteDatabase.insert(DATABASE_TABLE, null, initialValues);

}

public boolean Login(String username, String password) {
    // TODO Auto-generated method stub
    Cursor mCursor = sqLiteDatabase.rawQuery("SELECT * FROM "
            + DATABASE_TABLE + " WHERE username=? AND password=?",
            new String[] { username, password });
    if (mCursor != null) {
        if (mCursor.getCount() > 0) {
            return true;
        }
    }
    return false;
}

 }

ExampleActivity.java

                 public class ExampleActivity extends Activity {
private SQLiteAdapter mySQLiteAdapter;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    ListView listContent = (ListView) findViewById(R.id.contentlist);

    /*
     * Create/Open a SQLite database and fill with dummy content and close
     * it
     */
    mySQLiteAdapter = new SQLiteAdapter(this);
    mySQLiteAdapter.openToWrite();
    // mySQLiteAdapter.deleteAll();

    mySQLiteAdapter.insert("A for Apply");
    mySQLiteAdapter.insert("B for Boy");
    mySQLiteAdapter.insert("C for Cat");
    mySQLiteAdapter.insert("D for Dog");
    mySQLiteAdapter.insert("E for Egg");
    mySQLiteAdapter.insert("F for Fish");

    mySQLiteAdapter.close();

    /*
     * Open the same SQLite database and read all it's content.
     */
    mySQLiteAdapter = new SQLiteAdapter(this);
    mySQLiteAdapter.openToRead();

    Cursor cursor = mySQLiteAdapter.queueAll();
    startManagingCursor(cursor);

    String[] from = new String[] { SQLiteAdapter.KEY_CONTENT };
    int[] to = new int[] { R.id.text };

    SimpleCursorAdapter cursorAdapter = new SimpleCursorAdapter(this,
            R.layout.row, cursor, from, to);

    listContent.setAdapter(cursorAdapter);

    mySQLiteAdapter.close();

}

}

运行程序后，登录表只在数据库中创建，但是mainmenu表没有在数据库中创建。运行后程序显示错误，如sqlite返回代码= 1没有这样的表在MY_TABLE中

Answer 1

这是我用来获取所有值的代码。

/ * 这是数据库类 * /

public String getData1() throws SQLException{
        // TODO Auto-generated method stub
        String[] columns1 = new String[] { KEY_DATE };
        Cursor c1 = ourDatabase.query(DATABASE_MARKSTABLE, columns1, null, null, null,
                null, KEY_ENDINGTIME+" DESC", " 30");
        String result1 = "";

        int isName = c1.getColumnIndex(KEY_DATE);

        for (c1.moveToFirst(); !c1.isAfterLast(); c1.moveToNext()) {

            result1 = result1 + c1.getString(isName)
                    + "  " + "\n";

        }
        c1.close();
        return result1;

    }

并且为了在列表视图中显示它，请查看此链接

http://www.technotalkative.com/android-%E2%80%93-listview-%E2%80%93-2-custom-listview/

如何从sqlite数据库中获取数据并在android中的listview中显示

1 个答案: