A lightweight dropdown popup spinner with an arrow and animations

PowerSpinner

A lightweight dropdown popup spinner with an arrow and animations.

Including in your project

Gradle

Add below codes to your root build.gradle file (not your module build.gradle file).

allprojects {
    repositories {
        jcenter()
    }
}

And add a dependency code to your module's build.gradle file.

dependencies {
    implementation "com.github.skydoves:powerspinner:1.0.1"
}

Usage

Add following XML namespace inside your XML layout file.

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

PowerSpinnerView

Here is a basic example of implementing PowerSpinnerView.

Basically the PowerSpinnerView extends TextView, so we can use it like a TextView.

You can set the unselected text using hint and textColorHint attributes.

<com.skydoves.powerspinner.PowerSpinnerView
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:background="@color/md_blue_200"
  android:gravity="center"
  android:hint="Question 1"
  android:padding="10dp"
  android:textColor="@color/white_93"
  android:textColorHint="@color/white_70"
  android:textSize="14.5sp"
  app:spinner_arrow_gravity="end"
  app:spinner_arrow_padding="8dp"
  app:spinner_divider_color="@color/white_70"
  app:spinner_divider_show="true"
  app:spinner_divider_size="0.4dp"
  app:spinner_item_array="@array/questions"
  app:spinner_popup_animation="dropdown"
  app:spinner_popup_background="@color/background800"
  app:spinner_popup_elevation="14dp" />

Create using builder class

We can create an instance of PowerSpinnerView using the builder class.

val mySpinnerView = createPowerSpinnerView(this) {
  setSpinnerPopupWidth(300)
  setSpinnerPopupHeight(350)
  setArrowPadding(6)
  setArrowAnimate(true)
  setArrowAnimationDuration(200L)
  setArrowGravity(SpinnerGravity.START)
  setArrowTint(ContextCompat.getColor(this@MainActivity, R.color.md_blue_200))
  setSpinnerPopupAnimation(SpinnerAnimation.BOUNCE)
  setShowDivider(true)
  setDividerColor(Color.WHITE)
  setDividerSize(2)
  setLifecycleOwner(this@MainActivity)
}

Show and dismiss

Basically, when the PowerSpinnerView is clicked, the spinner popup will be showed and

when an item is selected, the spinner popup will be dismissed.

But you can show and dismiss manually using methods.

powerSpinnerView.show() // show the spinner popup
powerSpinnerView.dismiss() // dismiss the spinner popup

// If the popup is not showing, shows the spinner popup menu.
// If the popup is already showing, dismiss the spinner popup menu.
powerSpinnerView.showOrDismiss()

And you can set the show and dismiss actions using some listener and attributes.

// the spinner popup will not be shown when clicked.
powerSpinnerView.setOnClickListener { }

// the spinner popup will not be dismissed when item selected.
powerSpinnerView.dismissWhenNotifiedItemSelected = false

OnSpinnerItemSelectedListener

Interface definition for a callback to be invoked when selected item on the spinner popup.

setOnSpinnerItemSelectedListener<String> { index, text ->
   toast("$text selected!")
}

Here is the java way.

powerSpinnerView.setOnSpinnerItemSelectedListener(new OnSpinnerItemSelectedListener<String>() {
  @Override public void onItemSelected(int position, String item) {
    toast(item + " selected!")
  }
});

selectItemByIndex

We can select an item manually or initially using the below method.

spinnerView.selectItemByIndex(4)

SpinnerAnimation

We can customize the showing and dimsmiss animation.

SpinnerAnimation.DROPDOWN
SpinnerAnimation.FADE
SpinnerAnimation.BOUNCE

Dropdown	Fade	Bounce

Customized adapter

We can use our customized adapter and binds to the PowerSpinnerView.

The PowerSpinnerView provides the spinner popup's recyclerview via getSpinnerRecyclerView method.

Here is a sample of the customized adapter.

val adapter = IconSpinnerAdapter(spinnerView)
spinnerView.setSpinnerAdapter(adapter)
spinnerView.getSpinnerRecyclerView().layoutManager = GridLayoutManager(context, 2)

IconSpinnerAdapter

Basically, this library provides a customized adapter.

We should create an instance of the IconSpinnerAdapter and call setItems using a list of IconSpinnerItem.

spinnerView.apply {
  setSpinnerAdapter(IconSpinnerAdapter(this))
  setItems(
    arrayListOf(
        IconSpinnerItem(contextDrawable(R.drawable.unitedstates), "Item1")))
  getSpinnerRecyclerView().layoutManager = GridLayoutManager(context, 2)
  selectItemByIndex(0) // select an item initially.
  lifecycleOwner = this@MainActivity
}

Here is the java way.

List<IconSpinnerItem> iconSpinnerItems = new ArrayList<>();
iconSpinnerItems.add(new IconSpinnerItem(contextDrawable(R.drawable.unitedstates), "item1"));

IconSpinnerAdapter iconSpinnerAdapter = new IconSpinnerAdapter(spinnerView);
spinnerView.setSpinnerAdapter(iconSpinnerAdapter);
spinnerView.setItems(iconSpinnerItems);
spinnerView.selectItemByIndex(0);
spinnerView.setLifecycleOwner(this);

Customized adapter

Here is a way to customize your adapter for binding the PowerSpinnerView.

Firstly, create a new adapter and viewHolder extending RecyclerView.Adapter and PowerSpinnerInterface<T>.

You shoud override spinnerView, onSpinnerItemSelectedListener fields and setItems, notifyItemSelected methods.

class MySpinnerAdapter(
  powerSpinnerView: PowerSpinnerView
) : RecyclerView.Adapter<MySpinnerAdapter.MySpinnerViewHolder>(),
  PowerSpinnerInterface<MySpinnerItem> {

  override val spinnerView: PowerSpinnerView = powerSpinnerView
  override var onSpinnerItemSelectedListener: OnSpinnerItemSelectedListener<MySpinnerItem>? = null

On the customized adapter, you must call spinnerView.notifyItemSelected method when your item is clicked or the spinner item should be changed.

override fun onBindViewHolder(holder: MySpinnerViewHolder, position: Int) {
  holder.itemView.setOnClickListener {
    notifyItemSelected(position)
  }
}

// we must call the spinnerView.notifyItemSelected method to let PowerSpinnerView know about changed information.
override fun notifyItemSelected(index: Int) {
  this.spinnerView.notifyItemSelected(index, this.spinnerItems[index].text)
  this.onSpinnerItemSelectedListener?.onItemSelected(index, this.spinnerItems[index])
}

And we can listen to the selected item's information.

spinnerView.setOnSpinnerItemSelectedListener<MySpinnerItem> { index, item ->  toast(item.text) }

Avoid Memory leak

Dialog, PopupWindow and etc.. have memory leak issue if not dismissed before activity or fragment are destroyed.

But Lifecycles are now integrated with the Support Library since Architecture Components 1.0 Stable released.

So we can solve the memory leak issue so easily.

Just use setLifecycleOwner method. Then dismiss method will be called automatically before activity or fragment would be destroyed.

.setLifecycleOwner(lifecycleOwner)

PowerSpinnerView Attributes

Attributes	Type	Default	Description
spinner_arrow_drawable	Drawable	arrow	arrow drawable.
spinner_arrow_show	Boolean	true	sets the visibility of the arrow.
spinner_arrow_gravity	SpinnerGravity	end	the gravity of the arrow.
spinner_arrow_padding	Dimension	2dp	padding of the arrow.
spinner_arrow_animate	Boolean	true	show arrow rotation animation when showing.
spinner_arrow_animate_duration	integer	250	the duration of the arrow animation.
spinner_divider_show	Boolean	true	show the divider of the popup items.
spinner_divider_size	Dimension	0.5dp	sets the height of the divider.
spinner_divider_color	Color	White	sets the color of the divider.
spinner_popup_width	Dimension	spinnerView's width	the width of the popup.
spinner_popup_height	Dimension	WRAP_CONTENT	the height of the popup.
spinner_popup_background	Color	spinnerView's background	the background color of the popup.
spinner_popup_animation	SpinnerAnimation	Dropdown	the spinner animation when showing.
spinner_popup_animation_style	Style Resource	-1	sets the customized animation style.
spinner_popup_elevation	Dimension	4dp	the elevation size of the popup.
spinner_item_array	String Array Resource	null	sets the items of the popup.
spinner_dismiss_notified_select	Boolean	true	sets dismiss when the popup item is selected.

PowerSpinner

Including in your project

Gradle

Usage

PowerSpinnerView

Create using builder class

Show and dismiss

OnSpinnerItemSelectedListener

selectItemByIndex

SpinnerAnimation

Customized adapter

IconSpinnerAdapter

Customized adapter

Avoid Memory leak

PowerSpinnerView Attributes

GitHub