在我的应用程序中,我想让用户能够使用他们的 Facebook 帐户登录。经过一些搜索,我能够弄清楚这一点,尽管我认为这种方式不是最好的方法。我在 UI 中使用了 webview,并使用 webviewclient 来感知 url 切换。据我了解,在 Android 上,我必须在我的 webviewclient 中处理所有重定向(Facebook 重定向,当用户设置他/她的电子邮件和密码时会发生几次重定向)。但我只需要解析我的输出 xml 并根据输出结果做出决定(重定向到我的家庭活动或失败等)。这是我的代码,如果存在更合适的方法,请提出您的建议。
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);
}
}
}