How to Add Item into List View from Toast message?

In SecondActivity, you can retrieve this event data from the Intent in the onCreate() method and add it to your ListView adapter. See how you can modify your SecondActivity code to achieve this:

public class SecondActivity extends AppCompatActivity {

    private ListView listView;
    private List eventList;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);

        listView = findViewById(R.id.listView);
        eventList = new ArrayList<>();

        // get the event data from the intent
        String eventData = getIntent().getStringExtra("event_data");
        
        // add the event data to the list
        eventList.add(eventData);

        // create and set the adapter for the list view
        ArrayAdapter adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, eventList);
        listView.setAdapter(adapter);
    }
}

This code retrieves the event data from the Intent in the onCreate() method using the key "event_data", adds it to the eventList list, and creates an ArrayAdapter with this list to set the adapter for the ListView. 

In MainActivity, after displaying the Toast message, add the following code to create an Intent and add the event data as an extra:

Intent intent = new Intent(this, SecondActivity.class);
intent.putExtra("event_data", this.events.get(this.events.size()-1)); // add the latest event to the intent as an extra
startActivity(intent);

This code creates an Intent to start the SecondActivity, and adds the latest event data as an extra with the key "event_data".

Hello Meggy,

To pass the event data from MainActivity to SecondActivity, you can use an Intent to start the SecondActivity and pass the event data as an extra.