check if element from SQLite Database is equal to a particular string

I have a SQLite database, that includes, id, taskName, startMonth and EndMonth

while starting an activity I want to get the text from the button that initialized this activity and check if the text on button is the same as one of the taskName-s. if I found that one of the taskName-s store the same string as the string on the button, then I want to get respective row, that includes this taskName, and set row elements to views.

But I cannot retrieve data from database...

in DBHandler class I have ArrayList but I do not know how to retrieve from an array. then I watched a tutorial and I wrote a method

public Cursor getInfo(){
SQLiteDatabase db = this.getWritableDatabase();
String [] columns = {KEY_ID, KEY_NAME, KEY_START, KEY_END};
Cursor CR = db.query(TABLE_TASKS, columns, null, null, null, null, null);
return CR;

}

Here is a method that saves extra information about button text

 private View.OnClickListener btnListener = new View.OnClickListener() {

    public void onClick(View view) {

        Intent intent = new Intent(getActivity(), AddGoalActivity.class);

        switch (view.getId()) {
            case R.id.button:

                intent.putExtra("called", buttonAdd.getText().toString());

                startActivityForResult(intent, BUTTON_1);
                break;

} }

here is a method that saves the data to database, I deleted some extra lines that is not interesting now

public void onClick(View view) {


            insertTask();
            putTextOnButton();
            break;
}

public void putTextOnButton () {


    taskName = editText.getText().toString();

        Intent i = new Intent(AddGoalActivity.this, MainActivity.class);
        i.putExtra("Goal", taskName);
        setResult(AddGoalActivity.RESULT_OK, i);

        finish();

    } 
}


public void insertTask(){
    dbHandler.getWritableDatabase();
    Task t = new Task();
    dbHandler.addTask(t);
    dbHandler.close();
}

and here is a code in onCreate method where all these checks should take place

 if (dbHandler.getTotalTasks() != 0) {

        Cursor CR = dbHandler.getInfo();
        String called_from = getIntent().getStringExtra("called");


        CR.moveToFirst();
        do {
            taskName = CR.getString(1);

            if (called_from.equals(taskName)) {


                // get single task by its taskName element and set all task elements to views
                Task t = dbHandler.getTask(called_from);
                editText.setText(t.getTaskName());
            }
        } while (CR.moveToNext());


    }
    dbHandler.close();