How To Display A "loading..." Text While Retrieving Items For A Listview

There are some others applications doing this, like Twitter, Facebook, or even native applications such as Android Market. When you want to display a list of items retrieved from t

Solution 1:

That's done with the help of AsyncTask (an intelligent backround thread) and ProgressDialog

When the AsyncTask starts we reaise a progressdialog with indeterminate state, once the task is finished we dismiss the dialog.

Example code What the adapter does in this example is not important, more important to understand that you need to use AsyncTask to display a dialog for the progress.

privateclassPrepareAdapter1extendsAsyncTask<Void,Void,ContactsListCursorAdapter > {
    ProgressDialog dialog;
    @Override
    protectedvoidonPreExecute() {
        dialog = new ProgressDialog(viewContacts.this);
        dialog.setMessage(getString(R.string.please_wait_while_loading));
        dialog.setIndeterminate(true);
        dialog.setCancelable(false);
        dialog.show();
    }
    /* (non-Javadoc)
     * @see android.os.AsyncTask#doInBackground(Params[])
     */
    @Override
    protected ContactsListCursorAdapter doInBackground(Void... params) {
        cur1 = objItem.getContacts();
        startManagingCursor(cur1);

        adapter1 = new ContactsListCursorAdapter (viewContacts.this,
                R.layout.contact_for_listitem, cur1, new String[] {}, newint[] {});

        return adapter1;
    }

    protectedvoidonPostExecute(ContactsListCursorAdapter result) {
        list.setAdapter(result);
        dialog.dismiss();
    }
}

Solution 2:

When user scrolls to the bottom your adapter's getView should return a view with "Loading.." text and spinning progress. At the same time AsyncTask or background thread should be started that downloads a new chunk of content. When content is ready adapter.notifyDatasetChanged() is called and ListView redisplays all content including the new items.

So "Loading..." message is just a last item in the ListView.

Solution 3:

I don't know whether it will completely fits your requirement, simple way is just set the loading text initially to android-empty-id-view like

 <TextView
        android:id="@android:id/empty"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_weight="1"
        android:gravity="center"
        android:text="Loading... Please Wait"
        android:textSize="20dip" />

and if no list items found then set android-empty-id-view to different message in async callback

((TextView) findViewById(android.R.id.empty)).setText("Your List is empty");

it will give enough indication to user that something is progressing..i.e list is loading