public class PxlrActivity extends Activity {
    private ImageView statusImageView;
    private EditText usernameEditText;
    private EditText passwordEditText;
    private Button signInButton;

    private String apiUrl;
    private String apiKey;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
        setContentView(R.layout.main);
        setProgressBarIndeterminateVisibility(false);

        apiUrl = getString(R.string.api_url);
        apiKey = getString(R.string.api_key);

        statusImageView = (ImageView)findViewById(R.id.status);
        usernameEditText = (EditText)findViewById(R.id.username);
        passwordEditText = (EditText)findViewById(R.id.password);
        signInButton = (Button)findViewById(R.id.signin);

        signInButton.setOnClickListener(signInButtonClickListener);
    }

    private OnClickListener signInButtonClickListener = new OnClickListener() {
        public void onClick(View v) {
            setProgressBarIndeterminateVisibility(true);

            String username = usernameEditText.getText().toString();
            String password = passwordEditText.getText().toString();

            String message = ApiHelper.verifyUser(apiUrl, apiKey, username, password);

            if(message != null) {
                statusImageView.setImageResource(R.drawable.logoerror);
                Toast.makeText(PxlrActivity.this, message, Toast.LENGTH_LONG).show();
            } else {
                statusImageView.setImageResource(R.drawable.logosuccess);
            }

            setProgressBarIndeterminateVisibility(false);
        }
    };
}