Android Open Source - formulize-android Login Dialog Fragment

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License

The source code is released under:
GNU General Public License
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Java Source Code

package ca.formulize.android.ui;
//from   w ww. j  ava 2  s .co  m
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.app.DialogFragment;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import ca.formulize.android.R;
import ca.formulize.android.connection.LoginRunnable;
import ca.formulize.android.data.ConnectionInfo;

/**
 * The login dialogue that should appear when the user attempts to connect to a
 * server without user credentials.
 * 
 * @author timch326
 * 
 */
public class LoginDialogFragment extends DialogFragment {

  public static final String EXTRA_CONNECITON_INFO = "ca.formulize.android.extras.connectionInfo";
  public static final String EXTRA_IS_REATTEMPT = "ca.formulize.android.extras.isReattempt";

  // Connection Details
  private ConnectionInfo connectionInfo;
  private Boolean isReattempt;
  private String username;
  private String password;

  // UI References
  private TextView errorMessageView;
  private EditText usernameView;
  private EditText passwordView;
  
  public Dialog onCreateDialog(Bundle savedInstanceState) {
    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());

    // Get the layout inflater
    LayoutInflater inflater = getActivity().getLayoutInflater();
    View view = inflater.inflate(R.layout.dialog_login, null);

    // Set UI References
    errorMessageView = (TextView) view.findViewById(R.id.errorMessage);
    usernameView = (EditText) view.findViewById(R.id.username);
    passwordView = (EditText) view.findViewById(R.id.password);

    // Retrieve arguments
    Bundle args = getArguments();
    connectionInfo = (ConnectionInfo) args
        .getParcelable(EXTRA_CONNECITON_INFO);
    isReattempt = args.getBoolean(EXTRA_IS_REATTEMPT, false);

    // Show and set error message if this is a login re-attempt
    if (isReattempt) {
      errorMessageView.setText(R.string.reattempt_message);
      errorMessageView.setVisibility(View.VISIBLE);
    }

    // Override the onclick of the positive button:
    // http://stackoverflow.com/questions/2620444/how-to-prevent-a-dialog-from-closing-when-a-button-is-clicked
    builder.setView(view)
        .setPositiveButton(android.R.string.ok, null)
        .setNegativeButton(android.R.string.cancel,
            new DialogInterface.OnClickListener() {

              @Override
              public void onClick(DialogInterface dialog,
                  int which) {
                LoginDialogFragment.this.getDialog()
                    .cancel();

              }
            }).setTitle(R.string.sign_in_label);

    final AlertDialog alertDialog = builder.create();
    

    // Override standard dialog positive button behaviour
    alertDialog.setOnShowListener(new DialogInterface.OnShowListener() {
      @Override
      public void onShow(DialogInterface dialog) {
        Button positiveButton = alertDialog
            .getButton(AlertDialog.BUTTON_POSITIVE);
        positiveButton.setOnClickListener(new View.OnClickListener() {

          @Override
          public void onClick(View view) {
            username = usernameView.getText().toString();
            password = passwordView.getText().toString();
            connectionInfo.setUsername(username);
            connectionInfo.setPassword(password);

            if (isValidInput()) {
              ProgressDialog progressDialog = new ProgressDialog(LoginDialogFragment.this.getActivity());
              progressDialog.setMessage(getString(R.string.progress_login));
              progressDialog.show();
              Handler handler = new ConnectionActivity.LoginHandler(LoginDialogFragment.this.getActivity(), connectionInfo, progressDialog);
              Runnable loginRunnable = new LoginRunnable(connectionInfo, handler);
              new Thread(loginRunnable).start();
              LoginDialogFragment.this.dismiss();
            }
          }
        });
      }
    });

    return alertDialog;
  }

  /**
   * Checks the validity of the input the user has entered
   * 
   * @return the validity of the inputs
   */
  private boolean isValidInput() {
    Boolean isValid = true;
    if ("".equals(username)) {
      usernameView.setError(getString(R.string.error_username));
      isValid = false;
    }
    if ("".equals(password)) {
      passwordView.setError(getString(R.string.error_password));
      isValid = false;
    }
    return isValid;
  }
}
Java Source Code List
