Android Timeline View Library demonstrate the the power of ConstraintnLayout and RecyclerView.

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Quick Setup

1. Include library

Using Gradle

TimelineView is currently available in on Jitpack so add the following line before every other thing if you have not done that already.

allprojects {
  repositories {
    ...
    maven { url 'https://jitpack.io' }
  }
}

Then add the following line

dependencies {
  compile 'com.github.po10cio:TimeLineView:1.0.2'
}

Using Maven

Also add the following lines before adding the maven dependency

<repositories>
  <repository>
    <id>jitpack.io</id>
    <url>https://jitpack.io</url>
  </repository>
</repositories>

Then add the dependency

<dependency>
  <groupId>com.github.po10cio</groupId>
  <artifactId>TimeLineView</artifactId>
  <version>1.0.2</version>
</dependency>

2. Usage

In your XML layout include the TimelineView as follows:

<me.jerryhanks.stepview.TimeLineView
  android:id="@+id/timelineView"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:layout_marginBottom="8dp"
  android:layout_marginLeft="8dp"
  android:layout_marginRight="8dp"
  android:layout_marginTop="16dp">

Then in your Kotlin code, do the following:

Create a class that extends TimeLine

class MyTimeLine(status: Status, var title: String?, var content: String?) : TimeLine(status) {
  override fun equals(other: Any?): Boolean {
    if (this === other) return true
    if (javaClass != other?.javaClass) return false
        other as MyTimeLine

    if (title != other.title) return false
    if (content != other.content) return false

    return true
  }

  override fun hashCode(): Int {
    var result = if (title != null) title!!.hashCode() else 0
    result = 31 * result + if (content != null) content!!.hashCode() else 0

    return result
  }

  override fun toString(): String {
    return "MyTimeLine{" +
      "title='" + title + '\'' +
      ", content='" + content + '\'' +
      '}'
  }
}

TimeLine has three Statuses:

• Status.COMPLETED
• Status.UN_COMPLETED
• Status.ATTENTION

You can choose from any of the statuses depending on the status of the item you want to represent.

Create an Array of your TimeLine

val timeLines = mutableListOf<MyTimeLine>()
  .apply {
    add(MyTimeLine(Status.COMPLETED, getString(R.string.s_title_1), getString(R.string.s_content_1)))
    add(MyTimeLine(Status.COMPLETED, getString(R.string.s_title_2), getString(R.string.s_content_2)))
    add(MyTimeLine(Status.COMPLETED, getString(R.string.s_title_3), getString(R.string.s_content_3)))
    add(MyTimeLine(Status.COMPLETED, getString(R.string.s_title_4), getString(R.string.s_content_4)))
    add(MyTimeLine(Status.COMPLETED, getString(R.string.s_title_5), getString(R.string.s_content_5)))
    add(MyTimeLine(Status.COMPLETED, getString(R.string.s_title_6), getString(R.string.s_content_6)))
    add(MyTimeLine(Status.COMPLETED, getString(R.string.s_title_7), getString(R.string.s_content_7)))
  }

Create the IndicatorAdapter and add it to the TimeLineView

val adapter = IndicatorAdapter(mutableListOf(), this, object : TimeLineViewCallback<MyTimeLine> {
  override fun onBindView(model: MyTimeLine, container: FrameLayout, position: Int): View {
    val view = layoutInflater
      .inflate(R.layout.sample_time_line,
      container, false)

    (view.findViewById<TextView>(R.id.tv_title)).text = model.title
    (view.findViewById<TextView>(R.id.tv_content)).text = model.content

    return view
  }
})

timelineView.setIndicatorAdapter(adapter)
adapter.swapItems(timeLines)

IndicatorAdapter This extends RecyclerView.Adapter and exposes the following functions:

• Swaps the old items with the new items

  fun swapItems(timeLines: List<T>)
  

• Update a single item given the index

  fun updateItem(timeline: T, position: Int)
  

• Adds a list of items to the list starting from the given index

  fun addItems(vararg items: T, index: Int = itemCount)
  

Changelog

See the changelog file.

License

TimeLineView is distributed under the MIT license. See LICENSE for details.