Material Contextual Action Bar

Material CAB allows you to implement a customizable and flexible contextual action bar in your app. The traditional stock CAB on Android is limited to being placed at the top of your Activity, and the navigation drawer cannot go over it. This library lets you choose its exact location, and a toolbar is used, allowing views to be be placed over and under it.

Table of Contents

1. Gradle Dependency
2. Getting Started
3. Destroying the CAB

---

Gradle Dependency

Add Material CAB to your module's build.gradle dependencies block:

dependencies {

  implementation 'com.afollestad:material-cab:2.0.1'
}

---

Getting Started

This library attaches to your Activity by taking the place of a ViewStub in your Activity layout. For an example, this is similar to the main layout of the sample project:

<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical">

  <FrameLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <androidx.appcompat.widget.Toolbar
      android:id="@+id/main_toolbar"
      ... />

    <ViewStub
      android:id="@+id/cab_stub"
      android:layout_width="match_parent"
      android:layout_height="?actionBarSize" />

  </FrameLayout>

  <androidx.recyclerview.widget.RecyclerView
    android:id="@+id/list"
    ... />

</LinearLayout>

You create/attach a Material CAB in an Activity like this:

class MyActivity : AppCompatActivity() {
  private var cab: AttachedCab? = null
  
  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    
    // createCab is an extension on Activity/Fragment
    cab = createCab(R.id.cab_stub) {
        title(R.string.some_title)
        menu(R.menu.some_menu)
        slideDown()
    }
  }
}

R.id.cab_stub references the ViewStub, which is replaced with the CAB toolbar.

In addition, you can also pass the ID of a ViewGroup (such as a FrameLayout). The CAB will get appended as a child to that view group.

---

Configuration

You can configure various properties about your CAB during attachment:

val attachedCab = createCab(R.id.cab_stub) {
    title(R.string.some_title)
    title(literal = "Some Title")
    subtitle(R.string.some_subtitle)
    subtitle(literal = "Some Subtitle")
    
    titleColor(R.color.white)
    titleColor(literal = Color.WHITE)
    subtitleColor(R.color.white)
    subtitleColor(literal = Color.WHITE)
    
    popupTheme(R.style.ThemeOverlay_AppCompat_Light)
    
    contentInsetStart(R.dimen.mcab_default_content_inset)
    contentInsetStart(literal = 52)
    
    backgroundColor(R.color.dark_gray)
    backgroundColor(literal = Color.DARK_GRAY)
    
    closeDrawable(R.drawable.close_icon)
    
    menu(R.menu.cab_menu_items)

    onCreate { cab, menu ->
      ...
    }
    onSelection { item ->
      ...
      true // allow selection?
    }
    onDestroy { cab ->
      ...
      true // allow destruction?
    }
    
    animateOnCreate { view, animator -> 
      // Animate the view with its animator.
      // See the source of fadeIn(Long) or slideDown(Long) for an example.
    }
    
    animateOnDestroy { view, animator ->
      // Animate the view with its animator.
      // See the source of fadeIn(Long) or slideDown(Long) for an example.
    }
    
    // Sets animateOnCreate and animateOnDestroy to fade the CAB. Duration is optional, 250 is default.
    fadeIn(durationMs = 250)
    
    // Sets animateOnCreate and animateOnDestroy to slide the CAB up/down. Duration is optional, 250 is default.
    slideDown(durationMs = 250)
}

---

Destroying the CAB

The navigation icon in your CAB toolbar (far left button) will trigger this method, but you can manually call it whenever you'd like as well:

val cab: AttachedCab? = // ...

val isDestroyed = cab.isDestroyed() // true if null or destroyed
val isActive = cab.isActive() // true if not destroyed

cab.destroy()

This will invoke the onDestroy callback. If the callback returns true, the CAB is destroyed. If the CAB replaced a ViewStub, it's hidden (GONE), otherwise it's removed from the layout.