Question

private ArrayList<String> conversation = new ArrayList<String>();
public ArrayAdapter<String> adapter;
private String phoneNumber;     
ListView listView;



protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.converse_view);

    this.adapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_list_item_1, android.R.id.text1,
            conversation);

    ListView listView = (ListView) findViewById(R.id.conversation);
    listView.setAdapter(adapter);

}



protected void onResume()
{
   super.onResume();
   setContentView(R.layout.converse_view);
   this.adapter.notifyDataSetChanged();


}


public void changeNumber(String phoneNumber2) {
    this.phoneNumber = phoneNumber2;

}

public void addText(String message) {
    conversation.add(message);

}

@Override
public String toString() {
    return phoneNumber;
}

public boolean equals(converseView other) {
    return this.phoneNumber.equals(other.phoneNumber);
}

I am creating a text messaging app this is my class for the conversation view screen.
addText() is called when you click the send button. How do i get the list view to update so i can see what text messages where send

Answer 1

You need to add the message to the adapter, and notify the adapter that the list has changed.

if (this.adapter!=null)
{
  this.adapter.add(message);
  this.adapter.notifyDataSetChanged();
}

Basically, the last time that the adapter knows the state of conversation is at:

this.adapter = new ArrayAdapter<String>(this,
        android.R.layout.simple_list_item_1, android.R.id.text1,
        conversation);

This will add everything from the ArrayList to the ArrayAdapter, but it doesn’t link them together in any way.