Java – how to dynamically add projects to listview in Android

Who can help me? I'm trying to create a listview in Android, and I'm trying to load the project into it using code (not XML)

This is my code so far

tweetList = (ListView)this.findViewById(R.id.tweetListView);
        TextView tv;
        for(int i=0;i<20;i++)
        {
            tv = new TextView(this);
            tv.setText("I'm a textView");
            tweetList.addHeaderView(tv);

        }

        tweetList.invalidate();

What on earth did I do wrong? These items are not displayed at run time

Editor: I changed the code according to the answer below. This is my current code

tweetList = (ListView)this.findViewById(R.id.tweetListView);
        ArrayAdapter<TextView> aa = new ArrayAdapter<TextView>(this,R.id.tweetListView);
        tweetList.setAdapter(aa);
        TextView tv;
        for(int i=0;i<20;i++)
        {
            tv = new TextView(this);
            tv.setText("I'm a textView");
            //tweetList.addHeaderView(tv);

            aa.add(tv);

        }

        tweetList.invalidate();

I now get an exception

11-10 01:32:16.002: ERROR/AndroidRuntime(867): android.content.res.Resources$NotFoundException: Resource ID #0x7f050030 type #0x12 is not valid

Why can't I add them dynamically now?

Solution

You need to use the arrayadapter and add it to the listview Then simply add elements to the arrayadapter dynamically

For example:

ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(context,android.R.layout.simple_list_item_1);
tweetList.setAdapter(arrayAdapter);
// ...
arrayAdapter.add("New Item");