In my app, I want to make users be able to login with their Facebook account. After some searches, I am able to figure out this although I don't think this way is the best method. I used a webview in my UI, and a webviewclient to sense url switchings. As I understand, On Android, I must handle all redirections in my webviewclient (Facebook redirections, several redirections happen when user set the his/her email and password). But all I need is to parse my output xml and make a decision according to output result(redirect to my home activiy or failure etc). Here is my code, Please give your suggestions if more suitable method exists.
public class FbLoginActivity extends Activity {
String fbLoginBaseUrl = "{my server url}/facebook/redirector.jsp?";
private ProgressDialog progressBar;
WebView webView;
int count = 0;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fb_login);
fbLoginBaseUrl += "usdId=NoSession:";
fbLoginBaseUrl += Subroutines.getInstance().getDeviceId() + "_L";
webView = (WebView) findViewById(R.id.webview);
webView.getSettings().setJavaScriptEnabled(true);
webView.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);
progressBar = ProgressDialog.show(FbLoginActivity.this, "", "Page is loading...");
webView.setWebViewClient(new HelloWebViewClient());
webView.loadUrl(fbLoginBaseUrl);
}
private class HelloWebViewClient extends WebViewClient {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
Log.v(Subroutines.TAG, url);
return true;
}
@Override
public void onPageFinished(WebView view, String url) {
Log.i(Subroutines.TAG, "Finished loading URL: " +url);
// if login screen loading finishes, cancel the progressdialog..
// twice redirecting happens to this sub url..
String subFace = "m.facebook.com/login.php";
if(url.indexOf(subFace) != -1 && ++count == 2){
if (progressBar.isShowing()) {
progressBar.cancel();
}
}
// Permission redirecting..
String loginSub = "www.facebook.com/connect/uiserver.php?method=permissions.request";
if(url.indexOf(loginSub) != -1){
progressBar = ProgressDialog.show(FbLoginActivity.this, "", "Logging in...");
}
// finally if my server makes a response..
String sub = "{my server url}/facebook/connect.jsp";
if(url.indexOf(sub) != -1){
Log.v(Subroutines.TAG, "my server makes a response..");
// xml parsing stuff..
// use url content to parse
}
}
@Override
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
Log.e(Subroutines.TAG, "Error: " + description);
}
}
}
I would get the Facebook SDK and use their functions
In a nutshell you do this:
public Facebook facebook = new Facebook("appID");
Then in on create or wherever:
facebook.authorize(this,String[] YourNeededPermissions, new DialogListener() {
@Override
public void onComplete(Bundle values) {}
@Override
public void onFacebookError(FacebookError error) {}
@Override
public void onError(DialogError e) {}
@Override
public void onCancel() {}
});
You can see this here: http://developers.facebook.com/docs/guides/mobile/#android