Android delete query database

i trying to delete query database in my app but i have a little problem. so, in delete code i have 4 case :

1. database empty -> MESSAGE TOAST DATABASE EMPTY


2. txtfield empty -> MESSAGE TOAST TXTFIELD EMPTY


3. words in txtfield not found in DB -> MESSAGE TOAST word no found


4. deleted OK -> DELETE QUERY + TOAST NOTIFICATION

My problem is 3° case, I use an external method to verify if words exists in db! this is code :

public boolean trovato(String n){

    boolean find = false;
    int k=0;

    Cursor c=db.rawQuery("SELECT * from TABLE_NAME", null);
    int count= c.getCount();
    c.moveToFirst();

    String[] nomi = new String[count];


    while(c.moveToNext())
    {
       nomi[k]= c.getString(c.getColumnIndex("fname"));
       if(nomi[k].equalsIgnoreCase(n)){
           find = true;
           break;
       }else{
           k++;
       }


    }
    return false;
}

public void delete(View data){

    EditText delete=(EditText)findViewById(R.id.txtdel);
    String delete2 = delete.toString();
    Cursor c=db.rawQuery("SELECT * from TABLE_NAME", null);
    int count= c.getCount();   

    if(count==0){
        Toast.makeText(getApplicationContext(),"DATABASE VUOTO",Toast.LENGTH_LONG).show();
    }

    else if(delete.getText().toString().trim().length()==0){
        Toast.makeText(getApplicationContext(),"STRINGA VUOTA, RIPROVA", Toast.LENGTH_LONG).show();

    }else if(trovato(delete.toString())){

        Toast.makeText(getApplicationContext(),"NON ESISTE !!!!",Toast.LENGTH_LONG).show();
    }else{
        db.execSQL("DELETE FROM TABLE_NAME WHERE fname='"+delete.getText()+"'");
        Toast.makeText(getApplicationContext(),"DELETE OK",Toast.LENGTH_LONG).show();
    }
}