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BOOK: Professional Android Application Development ISBN: 978-0-470-34471-2
This is the forum to discuss the Wrox book Professional Android Application Development by Reto Meier; ISBN: 9780470344712
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Old March 3rd, 2009, 06:22 PM
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Default Chap 2 ToDoList - Stopped Unexpectedly

I hope I didn't miss something basic, but my first attempt to run the ToDoList in Chapter 2 results in: "Sorry! The application To Do List has stopped unexpectedly. Please try again.". I assume there's an exception somewhere, but I'm too much of a novice to diagnose it.

Code:
package com.paad.todolist;

import java.util.ArrayList;

import android.app.Activity;
import android.os.Bundle;
import android.view.*;
import android.view.View.*;
import android.widget.*;

public class ToDoList extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle icicle) {
        // Inflate your view
        setContentView(R.layout.main);
        
        // Get references to UI widgets
        ListView myListView = (ListView)findViewById(R.id.myListView);
        final EditText myEditText = (EditText)findViewById(R.id.myEditText);
        
        // Create the array list of to do items
        final ArrayList<String> todoItems = new ArrayList<String>();
        // Create the array adapter to bind the array to the listview
        final ArrayAdapter<String> aa;
        aa = new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1,
                todoItems);
        // Bind the array adapter to the listview
        myListView.setAdapter(aa);
        
        myEditText.setOnKeyListener(new OnKeyListener() {
            public boolean onKey(View v, int keyCode, KeyEvent event) {
                if (event.getAction() == KeyEvent.ACTION_DOWN)
                    if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER)
                    {
                        todoItems.add(0, myEditText.getText().toString());
                        aa.notifyDataSetChanged();
                        myEditText.setText("");
                        return true;
                    }
                return false;
            }
        });
    }
}
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Old March 4th, 2009, 01:14 PM
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Default

I actually found the reason for my program crashing. I had dropped the call to:

super.onCreate(icicle);

from my method since the book didn't include this in the source code. Although the Eclipse template creates this call, I took the book's code literally which might confuse some readers in this case.
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