Android Vertical Stepper Form Library

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Vertical Stepper Form Library
Vertical Stepper Form Library

Google came Android vertical stepper concept with Material design and that display progress through a sequence of logical and numbered steps. They may also be used for navigation.

Android Vertical Steppers may display a transient feedback message after a step is saved. And today we’re going to see a cool library which help you to implement that stepper form in your applications. This Android library implements a vertical stepper form following Google Material Design guidelines.

Demo : Vertical Stepper Form Library
Demo : Vertical Stepper Form Library
Disclaimer

There may be slight differences between the official Material Design specifications and the implementation of this library.

1Examples

Example of Android Vertical Stepper Form Library
Example of Android Vertical Stepper Form Library

2What’s new

Version 0.9.9

  • Dimensions are specified in an XML file so they can be overriden
  • Subtitles can be added in each step by calling stepsSubtitles() in the builder
  • Titles and subtitles can be modified after the form has been initialized thanks to setStepTitle() and setStepSubtitle()
  • Official Material Design appearance can be applied to disabled/not visited steps by calling materialDesignInDisabledSteps(true) in the builder
  • The hiding of the software keyboard that is carried out by default every time a step is open can be avoided by calling hideKeyboard(false) in the builder
  • Now it is possible to force the vertical line to be displayed between collapsed steps by calling showVerticalLineWhenStepsAreCollapsed(true) in the builder

Version 0.9.8

  • Easier to set up (Builder Pattern has been implemented)
  • Navigation bar on the bottom can be hidden in order to make the form follow Material Design guidelines more precisely
  • Optional error messages for each step
  • Smoother transitions
  • Tick icon displayed on completed steps
  • Javadoc documentation of the most important methods

3Installation and usage

  • To include the library in your project, first add it via Gradle:
dependencies {
  compile 'com.ernestoyaquello.stepperform:vertical-stepper-form:0.9.9'
}
  • Now, you have to add a VerticalStepperFormLayout view to your activity layout, which will contain the vertical stepper form. For design purposes, it is recommended that you don’t put anything else than this view in your activity layout (see the code below).
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent" android:layout_height="match_parent"
    tools:context=".StepperExampleActivity">

    <ernestoyaquello.com.verticalstepperform.VerticalStepperFormLayout
        android:id="@+id/vertical_stepper_form"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentTop="true"/>

</RelativeLayout>
  • In onCreate(), you will need to find the view and initialize the form:
private VerticalStepperFormLayout verticalStepperForm;
...

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.your_activity_layout);
    
    String[] mySteps = {"Name", "Email", "Phone Number"};
    int colorPrimary = ContextCompat.getColor(getApplicationContext(), R.color.colorPrimary);
    int colorPrimaryDark = ContextCompat.getColor(getApplicationContext(), R.color.colorPrimaryDark);
    
    // Finding the view
    verticalStepperForm = (VerticalStepperFormLayout) findViewById(R.id.vertical_stepper_form);
        
    // Setting up and initializing the form
    VerticalStepperFormLayout.Builder.newInstance(verticalStepperForm, mySteps, this, this)
        .primaryColor(colorPrimary)
        .primaryDarkColor(colorPrimaryDark)
        .displayBottomNavigation(true) // It is true by default, so in this case this line is not necessary
        .init();
    
    ...
    
}

NOTE: In this step you may need need to import ernestoyaquello.com.verticalstepperform.*.

  • Finally, edit your activity class to make it implement VerticalStepperForm. Then, implement the methods createStepContentView(), onStepOpening() and sendData().

4Implementing the methods

createStepContentView()

This method will be called automatically by the system to generate the view of the content of each step. You have to implement the generation of the corresponding step view and return it:

@Override
public View createStepContentView(int stepNumber) {
  View view = null;
  switch (stepNumber) {
    case 0:
      view = createNameStep();
      break;
    case 1:
      view = createEmailStep();
      break;
    case 2:
      view = createPhoneNumberStep();
      break;
  }
  return view;
}

private View createNameStep() {
  // Here we generate programmatically the view that will be added by the system to the step content layout
  name = new EditText(this);
  name.setSingleLine(true);
  name.setHint("Your name");
  ...
  return name;
}

private View createEmailStep() {
  // In this case we generate the view by inflating a XML file
  LayoutInflater inflater = LayoutInflater.from(getBaseContext());
  LinearLayout emailLayoutContent = (LinearLayout) inflater.inflate(R.layout.email_step_layout, null, false);
  email = (EditText) emailLayoutContent.findViewById(R.id.email);
  ...
  return emailLayoutContent;
}

private View createPhoneNumberStep() {
  LayoutInflater inflater = LayoutInflater.from(getBaseContext());
  LinearLayout phoneLayoutContent = (LinearLayout) inflater.inflate(R.layout.phone_step_layout, null, false);
  ...
  return phoneLayoutContent;
}

onStepOpening()

This method will be called every time a step is open, so it can be used for checking conditions. It is noteworthy that the button “Continue” is disabled by default in every step, so it will only show up after certain user actions (for example, after the introduction of a correct name or email):

@Override
public void onStepOpening(int stepNumber) {
  switch (stepNumber) {
    case 0: 
      checkName();
      break;
    case 1:
      checkEmail();
      break;
    case 2: 
      // As soon as the phone number step is open, we mark it as completed in order to show the "Continue"
      // button (We do it because this field is optional, so the user can skip it without giving any info)
      verticalStepperForm.setStepAsCompleted(2);
      // In this case, the instruction above is equivalent to: 
      // verticalStepperForm.setActiveStepAsCompleted();
      break;
  }
}

private void checkName() {
  if(name.length() >= 3 && name.length() <= 40) {
    verticalStepperForm.setActiveStepAsCompleted();
  } else {
    // This error message is optional (use null if you don't want to display an error message)
    String errorMessage = "The name must have between 3 and 40 characters";
    verticalStepperForm.setActiveStepAsUncompleted(errorMessage);
  }
}

private void checkEmail() {
  ...
}

NOTE: You can also use this method to trigger some actions whenever a certain step is open.

sendData()

In this method you have to implement the sending of the data.

Screen rotation

This library handles screen rotation by saving and restoring the state of the form. Therefore, if you want to use onSaveInstanceState() and onRestoreInstanceState(), don’t forget to call super() at the end:

@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
  ...
  super.onSaveInstanceState(savedInstanceState);
}

@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
  ...
  super.onRestoreInstanceState(savedInstanceState);
}

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