Question

For my class we have to create an application where we catch an SMS message in a broadcast receiver, get the string (assumed to be a URL), add it dynamically to a string-array which is displayed in a fragmentlist. When the list item is clicked we then have to load it into a webview in a fragment.

Everything works until here.

The problem is that the list doesn’t update when I try to add the url_act string to it.

Here’s my code:

public class UpdateString extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.main);

    String url_act = "";
    Bundle b = getIntent().getExtras();
    url_act = b.getString("url");

    UrlListFragment uf = (UrlListFragment) getFragmentManager()
            .findFragmentById(R.id.listFragment);


    String[] urls = getResources().getStringArray(R.array.urls_array);
    List<String> list = new ArrayList<String>();
    list = Arrays.asList(urls);
    ArrayList<String> arrayList = new ArrayList<String>(list);
    arrayList.add(url_act);
    urls = arrayList.toArray(new String[list.size()]);

    ArrayAdapter<String> adapter = new ArrayAdapter<String>(UpdateString.this,
            android.R.layout.simple_list_item_1, urls);
    uf.setListAdapter(adapter);



}

If you need more code for context let me know. Updated

Answer 1

You really should post your logcat output just to be sure, as otherwise we don’t know what kind of exception was thrown.

That being said, I bet it is a NullPointerException; findFragmentById() is most likely returning null. This is probably because you never inflate your XML resource to begin with.