My Tracks to dailymile GPX route exporter – part 2

In my last post I talked about a project I’m working on to export GPS tracks from My Tracks directly to dailymile.

I was having problems getting the mobile client flow for oAuth 2.0 to work with dailymile. As a work around I decided to see if I could get the User-Agent flow to work for this application.

At the end of the previous post I suggested using an Intent filter to catch a redirect to a custom URI schema, while I got this to work it was messy as it left the browser app on the activity stack during the authentication. While looking for a way round this I found the documentation for the WebView widget and came up a much better solution. The WebView widget allows you to embed HTML content in your application so it should be possible to embed the web based authorisation set into a Activity.


<pre>
getWindow().requestFeature(Window.FEATURE_PROGRESS);
WebView webView = new WebView(this);
setContentView(webView);
final Activity activity = this;
webView.loadUrl(Constants.AUTH_URL);
</pre>

In the onCreate method of the Activity I have done away with a normal layout and just used a full screen WebView and asked it to load the authentication URL from the User-Agent Flow

https://api.dailymile.com/oauth/authorize?response_type=token&client_id=<CLIENT_ID>&redirect_uri=dm://locahost

Login Authorise

The callback redirect URI (dm://localhost) still has a custom schema similar to the one suggested in the previous post. Assuming the user allows access to their dailymile profile we can intercept the redirect by overriding the WebViewClient on the Webview which will look a bit like this:

dm://localhost#access_token=[ACCESS_TOKEN]

webView.setWebViewClient(new WebViewClient() {
  @Override
  public boolean shouldOverrideUrlLoading(WebView view, String url) {
    if (url.startsWith("dm://")) {
      String summary = "<html><body>Grabbing Account info</body></html>";
      view.loadData(summary, "text/html", "utf-8");
      String token = url.substring(url.lastIndexOf("=")+1);
      User user = Utilities.getAccountDetails(token, activity, handler);
      if (user != null) {
        user.setToken(token);
        finishLogin(user);
      }
      return false;
    }
    view.loadUrl(url);
    return true;
}});

Now I’ve got the AuthToken I can tuck it away in the Android AccountManager so I can grab it later when I want to upload a training session.

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