Tabris Local Storage

Question

I would like to use different functions like favorites and appointments for one user. I need login data in the app. But is it possible to use local storage in Tabris Framework?

score 0 · Answer 1 · answered May 21 '13 at 12:02

Tabris has a Client Service called ClientStore (RWT.getClient().getService( ClientStore.class) ) to save information on the device. Anyway, it's not recommended to save those data on the device. The recommended way is to store a token with the ClientStore to identify the user when he opens the app the next time. With this token you can store the data e.g. in a data base on the server. The ClientStore can be compared with cookies for a web browser. You never save to much data in a cookie.

score 0 · Answer 2 · answered Jun 03 '13 at 19:40

I'm about to use the ClientStorage, too. Right now I'm testing a few things with Tabris and I used the guide from here http://eclipsesource.com/blogs/2013/02/18/tabris-0-11-0-new-noteworthy/ .

I'm test setting a ClientStorage object from the value "false" to "true". But every time I exit the app and get back in, the value is back to "false" again.

 private void createContent( final UIContext context ) { 
    final ClientStore storageLogin = RWT.getClient().getService( ClientStore.class );
    storageLogin.add( "username", "none" );
    storageLogin.add( "passwd", "none" );
    storageLogin.add( "isLoggedIn", "false");
    labelUsername = new Label( containerContent, SWT.NONE );
    labelUsername.setText( "Username:" );
    final Text usernameText = new Text( containerContent, SWT.BORDER );
    final Label labelPasswd = new Label( containerContent, SWT.NONE );
    labelPasswd.setText( "Password:" );
    final Text passwdText = new Text( containerContent, SWT.PASSWORD | SWT.BORDER );
    final Button buttonLogin = new Button( containerContent, SWT.PUSH );
    if(storageLogin.get( "isLoggedIn" ) == "false"){
      buttonLogin.setText( "Log in" );
    }
    else{
      buttonLogin.setText( "Logged in!" );
    }
    buttonLogin.addSelectionListener( new SelectionListener() {

      public void widgetSelected( SelectionEvent event ) {
        if(storageLogin.get( "isLoggedIn" ) == "false"){
          StringBuilder stringBuilder = new StringBuilder();
          stringBuilder.append( "Username: " + usernameText.getText() + "\n" );
          stringBuilder.append( "Password: " + passwdText.getText() + "\n" );
          System.out.println( "Stringbuilder: \n" + stringBuilder.toString() );
          storageLogin.add( "username", usernameText.getText() );
          storageLogin.add( "passwd", passwdText.getText() );
          storageLogin.add( "isLoggedIn", "true" );
          buttonLogin.setText( "Logged in!" );
        }
        else{

        }

      }

      public void widgetDefaultSelected( SelectionEvent e ) {
      }
    } );

  }

Of course I won't safe any passwords in cleartext, just experimenting around. :)

score 0 · Answer 3 · answered Jun 03 '13 at 19:49

I would say this is because you execute storageLogin.add( "isLoggedIn", "false"); everytime you access the app. This will override the transfered value and store it back to the client. I would recommend only setting it to false if storageLogin.get( "isLoggedIn" ); returns null.

Tabris Local Storage

3 Answers3