Add entry to textview

Question

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.

Answer 1

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();

Answer 2

Add new data into your ArrayList and call the function adaptor.notifyDataSetChanged(); this will refresh your listview. And the new data will be added.