如何在listview之上添加项目并将其保存在数据库中

Question

I'm trying to save data using listview and I want to store the next data at the top of the listview instead it is storing data in the bottom. Here's my DatabaseHelper class

public class DatabaseHelper extends SQLiteOpenHelper {

private static final String TABLE_NAME = "people_table";
private static final String COL1 = "ID";
private static final String COL2 = "name";

public DatabaseHelper(Context context) {
    super(context, TABLE_NAME, null, 1);
}

@Override
public void onCreate(SQLiteDatabase db) {
    String createTable = "CREATE TABLE " + TABLE_NAME + "(ID INTEGER PRIMARY KEY AUTOINCREMENT, " +
            COL2 +" TEXT)";
    db.execSQL(createTable);
}

@Override
public void onUpgrade(SQLiteDatabase db, int i, int i1) {
    db.execSQL("DROP INDEX IF EXISTS " + TABLE_NAME);
    onCreate(db);
}

public boolean addData(String item) {
    SQLiteDatabase db = this.getWritableDatabase();
    ContentValues contentValues = new ContentValues();
    contentValues.put(COL2, item);


    Log.d(TAG, "addData: Adding " + item + " to " + TABLE_NAME);

    long result = db.insert(TABLE_NAME, null, contentValues);

    //if data as inserted incorrectly it will return -1
    if (result == -1) {
        return false;
    } else {
        return true;
    }
}

}

Answer 1

There is no such thing as top bottom middle etc with SQLite, although the order of insertions will generally/likely match the rowid column or an alias thereof (your ID column is an alias of the rowid column and as AUTOINCREMENT has been specified then a new insert will have a higher rowid then any that exist).

If you need data in a particular order then you use ORDER BY when extracting the data. In your case ORDER BY ID DESC should extract the latest first.

As the code you use to extract the data is not present the actual code to be used cannot be provided.