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.
Disclaimer
There may be slight differences between the official Material Design specifications and the implementation of this library.
Examples
What’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()
andsetStepSubtitle()
- 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
Installation 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 methodscreateStepContentView()
,onStepOpening()
andsendData()
.
Implementing 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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