Trying to add a string to an arraylist

Question

Why is the follow array assignment not working...

working part....

String[] values = new String[] { "Android","BlackBerry","HardCore"};
ArrayList<String> list = new ArrayList<String>();
for (int i = 0; i < values.length; ++i) 
   {
      list.add(values[i]);
   }

not working part...whit I add the following code to that onclick of a button the app crashes can anyone help...my ultimate goal is to get the text from a edittext view from the screen and place in into the list...however I and trying to do the following first

public void onClick(View view) 
   {
   list.add(new String("testing"));                 
   adapter.notifyDataSetChanged();
   }

Welcome To StackOverflow. Are you getting any exception? If so, post the stacktrace. — Maximin
– Maximin, Commented Dec 19, 2013 at 14:41
I would recommend not to use an ArrayList because it is not typecasted... The generic supporting alternative would be List — Dominic B.
– Dominic B., Commented Dec 19, 2013 at 14:45
How does ArrayList<String> even compile? ArrayList has no type parameters. Did you mean List<String>? — Jacob Rohde
– Jacob Rohde, Commented Dec 19, 2013 at 14:46
sorry now started android..how do one "post the stacktrace"? — user3103307
– user3103307, Commented Dec 19, 2013 at 16:34

mason · Accepted Answer · 2013-12-19 14:55:07Z

1

Is onClick() supposed to be an event handler for a button click? If so, the signature is wrong.

I believe you are looking for something like this. I have changed it from an ArrayList to a generic List. And initialized it with a collection initializer, and made it accessible from within your function. Please run the code below and let us know if you get exceptions.

List<string> MyList=new List<string>() {"Android", "Blackberry", "Hardcore"};

public void onClick(View view)
   {
   MyList.Add("testing");
   adapter.notifyDataSetChanged();
   }

answered Dec 19, 2013 at 14:55

mason

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2 Comments

user3103307 Over a year ago

Design error with the Lst<string>....saying "Syntax error on token(s), misplaced construct(s)"

mason Over a year ago

@user3103307 Are you programming in Java, or in C#? And make sure you check what your post for typos, to reduce confusion.

Scott Yang · Accepted Answer · 2013-12-19 14:49:22Z

0

ArrayList<String> list = new ArrayList<String>(); can this sentence be compile successfully? it cause compiling error in my VS2010 and .NetFramework3.5. I think you could use List<string> list = new List<string>(); to replace it.

answered Dec 19, 2013 at 14:49

Scott Yang

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1 Comment

user3103307 Over a year ago

Design time error saying "Cannot instantiate the type List<R.string>" at the List<string>....

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