Use getText().toString(); As Database Query Filter

I am just learning about Android and databases and would appreciate some assistance, hope I can be clear.

I have an Activity class where I get the getText().toString() value which works fine when I log the value returned, I would like to take this value and use it in my DatabaseHelper class to filter my query by this value which comes from a user click.

Activity Class:

    @Override
public void onItemClick(AdapterView<?> parent, View viewClicked, int position, long id) {
    // TODO Auto-generated method stub

    LinearLayout ll = (LinearLayout) viewClicked;                            
    TextView tv = (TextView) ll.findViewById(R.id.textViewArtistsSingle); 
    String tvName = tv.getText().toString()     

    // tv.getText().toString() will return JOHN if the user clicked on John

    startActivity(new Intent(CURRENT_ACTIVITY.this, NEXT_ACTIVITY.class));

DatabaseHelper Class:

    public List<String> getDBNameSingle(){

    List<String> listRows = new ArrayList<String>();
    SQLiteDatabase db = this.getWritableDatabase();

    Cursor c;

    try {

        c = db.rawQuery("SELECT name FROM " + TABLE_LM + " WHERE name = 'JOHN'", null); //Get Specific Name HARD)

I would like to HAVE THIS: (note tvName from getText().toString()

c = db.rawQuery("SELECT name FROM " + TABLE_LM + " WHERE name = '" + tvName +"'", null); //Get Specific Name VARIABLE)

INSTEAD of THIS:

c = db.rawQuery("SELECT name FROM " + TABLE_LM + " WHERE name = 'JOHN'", null); //Get Specific Name HARD)

But my DatabaseHelper class does not know about tvName, how can I pass this variable from CURRENT_ACTIVITY to DatabaseHelper so that I may filter the name column to return the row WHERE name = tvName (from getText().toString();)