public static final String CLIENT_ID = "seu_id";
public static final String CLIENT_SECRET = "seu_secret";
public static final String CALLBACK_URL = "callback";
String url ="https://instagram.com/oauth/authorize?" +"response_type=token" + "&redirect_uri=" + CALLBACK_URL+"&scope=basic"+"&client_id=" + CLIENT_ID ;

WebView webview;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.photo_activity);

    ActionBar bar = getActionBar();
    bar.setDisplayHomeAsUpEnabled(true);

    WebView webview = (WebView)findViewById(R.id.webView2);

    webview.setWebViewClient(new WebViewClient() {

        public void onPageStarted(WebView view, String url, Bitmap favicon) {
            String fragment = "#access_token=";
            int start = url.indexOf(fragment);
            if (start > -1) {

                // You can use the accessToken for api calls now.
                String accessToken = url.substring(start + fragment.length(), url.length());

                Log.v(TAG, "OAuth complete, token: [" + accessToken + "].");
                Log.i(TAG, "" +accessToken);
Toast.makeText(PhotosActivity.this, "Token: " + accessToken, Toast.LENGTH_SHORT).show();
            }
        }
    });

    webview.loadUrl(url);

}