OAuthActivity implements OAuth logg in in your Android application

OAuthActivity.java

public class OAuthActivity extends Activity {
 
    public static String OAUTH_URL = "https://github.com/login/oauth/authorize";
    public static String OAUTH_ACCESS_TOKEN_URL = "https://github.com/login/oauth/access_token";
    
    public static String CLIENT_ID = "YOUR_CLIENT_ID";
    public static String CLIENT_SECRET = "YOUR_CLIENT_SECRET";
    public static String CALLBACK_URL = "http://localhost";

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        String url = OAUTH_URL + "?client_id=" + CLIENT_ID;
        
        WebView webview = (WebView)findViewById(R.id.webview);
        webview.getSettings().setJavaScriptEnabled(true);
        webview.setWebViewClient(new WebViewClient() {
            public void onPageStarted(WebView view, String url, Bitmap favicon) {
                String accessTokenFragment = "access_token=";
                String accessCodeFragment = "code=";
                
            	// We hijack the GET request to extract the OAuth parameters
            	
            	if (url.contains(accessTokenFragment)) {
            		// the GET request contains directly the token
            		String accessToken = url.substring(url.indexOf(accessTokenFragment));
            		TokenStorer.setAccessToken(accessToken);

					
		} else if(url.contains(accessCodeFragment)) {
		        // the GET request contains an authorization code
			String accessCode = url.substring(url.indexOf(accessCodeFragment));
            		TokenStorer.setAccessCode(accessCode);
            		
            		
            		String query = "client_id=" + CLIENT_ID + "&client_secret=" + CLIENT_SECRET + "&code=" + accessCode;
            		view.postUrl(OAUTH_ACCESS_TOKEN_URL, query.getBytes());
		}
            	
            	            }
            
        
            
        });
        webview.loadUrl(url);
        
        
    }
}