Question

How to return a list in a column e.g like all emails in column…here my code

public String reTurn() throws SQLException 
{

    String emails=null;

    Cursor mCursor = db.rawQuery("SELECT EmailNO FROM  Details_Customer " ,null); 
    mCursor.moveToFirst(); 


    if(mCursor.getCount() > 0){ 
        emails= mCursor.getString(mCursor.getColumnIndex(DBAdapter.COLUMN_EMAIL)); 
        //password = mCursor.getString(11);
    }
return emails;
  }

But it only returning one email, I want it to return all the emails in a database

Answer 1

Try this:

public List<String> reTurn() throws SQLException 
{
    List<String> emails = new ArrayList<String>();
    Cursor mCursor = db.rawQuery("SELECT EmailNO FROM  Details_Customer ", null);

    int index = mCursor.getColumnIndex(DBAdapter.COLUMN_EMAIL);
    while(mCursor.moveToNext()) {
        emails.add(mCursor.getString(index)); 
        //password = mCursor.getString(11);
    }
    return emails;
}

Added from comment

From this:

email.putExtra(Intent.EXTRA_EMAIL, new String[]{ dbUser.reTurned});

I guess that your are trying to put the array of email addresses into an Intent called email. Here is a better approach:

public String[] reTurn() throws SQLException 
{
    Cursor mCursor = db.rawQuery("SELECT EmailNO FROM  Details_Customer ", null);
    String[] emails = new String[mCursor.getCount()];

    int i = 0;
    int index = mCursor.getColumnIndex(DBAdapter.COLUMN_EMAIL);
    while(mCursor.moveToNext()) {
        emails[i++] = mCursor.getString(index); 
        //password = mCursor.getString(11);
    }

    return emails;
}

And to put this in an Intent:

email.putExtra(Intent.EXTRA_EMAIL, dbUser.reTurned());

Lastly, in your new Activity read the email array with:

String[] emails = getIntent().getStringArrayExtra(Intent.EXTRA_EMAIL);

Hope that helps.