Android, array question

You'd be more flexible if instead you used an ArrayList. You don't need to change the ArrayAdapter part because it has a constructor that works with ArrayLists.

See the doc here: http://developer.android.com/reference/java/util/ArrayList.html

ArrayList allows you to replace, append, and remove as many elements as you want without worrying about reallocating your array or any other low level operation you'd need to do if you'd implemented your own data structure.

Here's an entire example that I was playing with the other day:

import java.util.ArrayList;
import android.app.Activity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnKeyListener;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;

public class TODOActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        // Get a handle to the ListView and hook it up to the todoList via the
        // adapter.
        ListView myListView = (ListView) findViewById(R.id.myListView);
        final ArrayList<String> todoList = new ArrayList<String>();
        final ArrayAdapter<String> todoListAdapter = new ArrayAdapter<String>(
                this, android.R.layout.simple_list_item_1, todoList);
        myListView.setAdapter(todoListAdapter);
        todoList.
        // Get a handle to the EditText and set a key listener to enter text.
        // with the dpad or enter key.
        final EditText myEditText = (EditText) findViewById(R.id.myEditText);
        myEditText.setOnKeyListener(new OnKeyListener() {
            public boolean onKey(View v, int keyCode, KeyEvent event) {
                if (event.getAction() == KeyEvent.ACTION_DOWN
                        && (keyCode == KeyEvent.KEYCODE_DPAD_CENTER
                                || keyCode == KeyEvent.KEYCODE_ENTER))  {
                    todoList.add(0, myEditText.getText().toString());
                    todoListAdapter.notifyDataSetChanged();
                    myEditText.setText("");
                    return true;    // consume event
                }
                // TODO Auto-generated method stub
                return false;
            }
        });

    }