Step Bar

With this library you can have a step bar that allows you to manage multiple fragment steps in a simple way.

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Add ViewPager and StepBar on layout

The step bar is a viewGroup, so, you can put a close tag like < /StepBar> and put some other view inside it.

<android.support.v4.view.ViewPager
    android:id="@+id/viewPager"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_above="@id/stepBar" />

<com.steps.StepBar
    android:id="@+id/stepBar"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true" />

Implementation of view

Here you have to give a view pager to the step bar. After complete all steps, the step bar will call the onComplete of your onCompleteListener. It gives you a bundle with all values of your steps. You can see an simple implementation of it below:

    override fun onCreate(savedInstanceState: Bundle?) {
          super.onCreate(savedInstanceState)
          setContentView(R.layout.step_container_activity)

          val steps = listOf<Step>(FirstStepFragment(), SecondStepFragment())

          viewPager.adapter = SampleStepAdapter(steps, supportFragmentManager)
          stepBar.setViewPager(viewPager)
      }

Getting results

To get the results after done all steps, you can use:

  //After compleet the stpes, onComplete will be called
  stepBar.setOnCompleteListener({
      val intent = Intent(this,ResultActivity::class.java)
      intent.putExtras(it)
      startActivity(intent)

  //Where 'it' is a bundle that concat all bundles of 'value' variable, returned by each step
  })

The Fragment

All the step fragments has to Extends support.v4.app.Fragment and implements Step:

class FirstStepFragment : Fragment(), Step {

with this, you have to provide a implementation to var value:Bundle, like this:

  override var value: Bundle
  get() = getValues()
  set(value) {}

  private fun getValues(): Bundle {
      val bundle = Bundle()
      bundle.putString("keyStepExample", "some value")
      return bundle
  }

//this value variable will be concat on done all steps and returned to
//onCompleteListener that you set in stepBar.setOnCompleteListener()

And implements invalidateStep method to, like this:

    override fun invalidateStep(invalidate: (isValid: Boolean?) -> Unit{
        invalidate(true) //this step will be ever valid
     }

For example, if you want to validate the step checking if some edit text is empty or not, you could do this:

    override fun invalidateStep(invalidate: (isValid: Boolean?) -> Unit) {
        this.invalidate = invalidate

        validate() //This is for validate when step back, it keeps the previous valid step valid
    }

    private fun validate() = invalidate(editText?.text?.let { !it.isEmpty() })

StepAdapter

To work with step bar, your adapter has to extends the StepAdapter and implements getCount and getStep

    override fun getCount(): Int = 3

    override fun getStep(position: Int): Step {
        when(position){
          0-> FirstStep()
          1-> SecondStep()
          2-> ThirdStep()
        }
    }

If you give a list of steps to your implementation of step adapter you can make things more simple, like:

    class TestAdapter constructor(val steps: List<Step>, fm: FragmentManager) : StepAdapter(fm) {

        override fun getStep(position: Int): Step = steps[position]

        override fun getCount(): Int = steps.size
    }

Customize

For now you can customize 3 attributes of step bar.

First, import custom attributes

 xmlns:step="http://schemas.android.com/apk/res-auto"

buttons_tint: this attribute changes the drawable color of back and next step buttons

<com.steps.StepBar
      android:id="@+id/stepBar"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_alignParentBottom="true"
      step:buttons_tint="@color/colorAccent"/>

done_text_tint: Using this, you can customize the color of done button text

<com.steps.StepBar
        android:id="@+id/stepBar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        step:done_text_tint="@color/colorPrimary"/>

if you don't customize the button text tint, the tint of done text will be the same of back and next step buttons

done_button_text : You can change the text of done button, that comes by default as "DONE"

<com.steps.StepBar
        android:id="@+id/stepBar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        step:done_button_text="Some other text" />