Android login screen goes blank

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http://stackoverflow.com – I am facing serious problems with the following code, and will appreciate any form of help. public class WebHandler { private String username; private String password; private boolean errorOccured; private String errorMessage; private String server; public WebHandler(String server) { this.server = server; StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build(); StrictMode.setThreadPolicy(policy); } public void setUsername(String username) { this.username = username; } public void setPassword(String password) { this.passw (HowTos)