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public class MainActivity extends Activity implements OnClickListener {
 
    private Button button;
    private WebView webView;
 
    private final static String CLIENT_ID = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
    private final static String CLIENT_SECRET = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
    private final static String CALLBACK_URL = "com.example.runkeeperapi://RunKeeperIsCallingBack";
 
    @SuppressLint("SetJavaScriptEnabled")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        //Force to login on every launch.
        CookieManager cookieManager = CookieManager.getInstance();
        cookieManager.removeAllCookie();
 
        button = (Button) findViewById(R.id.button);
        webView = (WebView) findViewById(R.id.webView);
        //This is important. JavaScript is disabled by default. Enable it.
        webView.getSettings().setJavaScriptEnabled(true);
    }