sticky-index

Introduction: A library that provides the "Sticky Letter Index" such as it is presented in the Android Contact App from Android Lollipop (API 21) on.
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Provides sticky-index and fast-scroller UI components

Showcase

How to use

  1. Import the dependencies
repositories {
    maven {
        url "https://jitpack.io"
    }
}

dependencies {
    compile 'com.github.edsilfer:sticky-index:1.3.0'
}
  1. Add the component to your XML layout, right after the RecyclerView:
<br.com.stickyindex.view.StickyIndex
    android:id="@+id/stickyIndex"
    android:layout_width="80dp"
    android:layout_height="wrap_content"
    android:textSize="20sp"
    android:textStyle="bold"
    app:rowHeight="64dp"
    app:stickyWidth="60dp" />

<android.support.v7.widget.RecyclerView
    android:id="@+id/recyclerView"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

 <br.com.stickyindex.view.FastScroller
    android:id="@+id/fastScroller"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:layout_alignParentEnd="true"
    android:layout_marginBottom="10dp"
    android:layout_marginTop="10dp" />

PS: FastScroller is optional

  1. Customize sitcky-index: You can customizing the stick-index with the following arguments:
    • xml android:textSize: changes the index list text size;
    • xml android:textStyle: changes the index list text style;
    • xml android:textColor: changes the index list test color;
    • xml app:rowHeight: changes the index list row height;
    • xml app:stickyWidth: changes the LinearLayout width that wrappers the text - which, by its turn, it is centralized inside it. Use this atribute to control the distance of the index list from the corner of its parent.

The last attribute xml android:rowHeight is mandatory. sticky-index consists of a RecyclerView which must match the reference one (in terms of ScrollListener and rowHeight). Having different rowHeights WILL lead to layout failures.

  1. initialize it in the container main class. The dataSet (a char array that will contain the indexes) must have the same size as the main list, with each row corresponding to the element that it will be associated). Finally, set the reference RecyclerView that will control the scroll movement:
    // Acquire component's reference
    StickyIndex stickyIndex = findViewById<StickyIndex>(R.id.stickyIndex);
    FastScroller fastScroller = findViewById<FastScroller>(R.id.fastScroller);
    // Binds the RecyclerViews to synchronize the scroll event between the them
    stickyIndex.bindRecyclerView(recyclerView);
    fastScroller.bindRecyclerView(recyclerView);
    // Adds the sticky index content to the stickyIndex. This must be called whenever the content changes
    stickyIndex.refresh(convertToIndexList(contacts))

License

Copyright 2018 Edgar da Silva Fernandes

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

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