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androidadditionelementcustom-adapter

Add entry to textview

I think the question is simple. But as a beginner I don't understand what to do. I have read this tutorial How to make list view with multiple textviews

My question is: How can I dynamically add an entry. Adapter.add fails. And I can't google because weather_data is of type weather and this is unknown. Thank you very much for your help.

Solution

  • The tutorial uses a java array which is difficult to add to after it has been created:

    Weather weather_data[]

    The custom adapter used doesn't override the Add method either which is why it doesn't work correctly. I suggest using an ArrayList instead that holds objects of type Weather. In MainActivity:

    ArrayList<Weather> weather_data = new ArrayList<Weather>();

weather_data.add(new Weather(R.drawable.weather_cloudy, "Cloudy"));
weather_data.add(new Weather(R.drawable.weather_showers, "Showers"));
weather_data.add(new Weather(R.drawable.weather_snow, "Snow"));
weather_data.add(new Weather(R.drawable.weather_storm, "Storm"));
weather_data.add(new Weather(R.drawable.weather_sunny, "Sunny"));

    In WeatherAdapter:

    Change the type of the class variable 'data' from an array to an ArrayList:

    Weather data[] = null;

    to become:

    ArrayList<Weather> data = null;

    Change the constructor to accept an ArrayList instead of an array:

    public WeatherAdapter(Context context, int layoutResourceId, ArrayList<Weather> data)

    In the getView method, you'll need to change the syntax for getting the correct array element (use the ArrayList get method):

    Weather weather = data.get(position);

    Then you can add items dynamically from your MainActivity. For example:

    weather_data.add(new Weather(R.drawable.weather_stormy, "Stormy"));
adapter.notifyDataSetChanged();