Initial commit

Pulling out modules from main QTalk app.
Separating module as standalone project
adding files.

.gitignore

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+*.iml
+.gradle
+.idea
+gradle.properties
+/local.properties
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+### Android template
+# Built application files
+*.apk
+*.ap_
+
+# Files for the ART/Dalvik VM
+*.dex
+
+# Java class files
+*.class
+
+# Generated files
+bin/
+gen/
+out/
+
+# Gradle files
+.gradle/
+build/
+
+# Local configuration file (sdk path, etc)
+local.properties
+
+# Proguard folder generated by Eclipse
+proguard/
+
+# Log Files
+*.log
+
+# Android Studio Navigation editor temp files
+.navigation/
+
+# Android Studio captures folder
+captures/
+
+# IntelliJ
+.idea/workspace.xml
+.idea/tasks.xml
+.idea/gradle.xml
+.idea/assetWizardSettings.xml
+.idea/dictionaries
+.idea/libraries
+.idea/caches
+
+# Keystore files
+# Uncomment the following line if you do not want to check your keystore files in.
+#*.jks
+
+
+# Google Services (e.g. APIs or Firebase)
+google-services.json
+
+# Freeline
+freeline.py
+freeline/
+freeline_project_description.json
+
+# fastlane
+fastlane/report.xml
+fastlane/Preview.html
+fastlane/screenshots
+fastlane/test_output
+fastlane/readme.md
+

README.md

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+#RecyclerViewFastScroller
+
+A simple, easy to use and configurable fast scroller for `RecyclerView`
+
+##Usage:
+
+The base layout type for this fast scroller is a `RelativeLayout` so creating a simple
+vertical fast scroller is as simple as adding elements as children to the `RecyclerViewFastScroller` layout tag
+
+    <com.qtalk.recyclerviewfastscroller.RecyclerViewFastScroller
+            android:layout_width="match_parent"
+            android:id="@+id/fastscroller"
+           android:layout_height="match_parent">
+            <android.support.v7.widget.RecyclerView
+                        android:layout_width="match_parent"
+                        android:layout_height="match_parent"/>
+            ....
+            other views can also come here
+            ....
+    </com.qtalk.recyclerviewfastscroller.RecyclerViewFastScroller>
+
+Since the fast scroller extends a `RelativeLayout` other view can also be added to it, with the rule of 
+the `RecyclerView` on which the fast scroller functionality needs to be added is the first element in the view group
+
+####Programmatically adding the RecyclerView
+
+If the `RecyclerView` to be added to the fast scroller is not available during layout creation time, the same can be done programmatically 
+by calling the `attachFastScrollerToRecyclerView` method on the `RecyclerView`
+
+###Linking with items:
+To reflect the item on the index of the top-most visible item, add make the adapter implement the `OnPopupTextUpdate` interface, which override the method
+`onChange(int index)` which passes the index of the element whose info needs to be displayed in the popup. 
+
+The `CharSequence` to be displayed should be returned in this method. 
+
+Ex:
+
+    class MyAdapter : RecyclerView.Adapter .... implements OnPopupTextUpdate{
+    ....
+    override fun onChange(position: Int): CharSequence {
+       val header = ......
+       return header                  
+       }
+    } 
+
+###Getting fast scroller callbacks:
+
+To get the callback from the fast scroller for different states, a listener can be added using the `setHandleStateListener` which accepts an interface of type
+`HandleStateListener` which has the following callback methods: 
+* `onEngaged` - Called  when the fast scroller is enaged
+* `onDragged` - Called on every movement of the fast scroller, note: this does not get called when the handle moves programmatically, i.e when then the Scroll is programmatic
+* `onReleased` - Called when the fast scroller is released. 
+
+##Customizable XML Attributes: 
+
+* `trackDrawable` - Adds a custom drawable to the scrolling track, defaults to `null` 
+* `handleDrawable` - Adds a custom drawable to the scrolling handle of the fast scroller 
+* `popupDrawable` - Adds a custom drawable to the popup used to show the index of the element fast scrolled at
+* `popupTextStyle` - Sets the style for the popup text shown
+* `fastScrollEnabled` - Boolean flag to enable/ disable the fast scroller, the fast scroller view and track are hidden when disabled
+* `popupPosition` - An enum to define where the popup should be shown for the fast scroller, one of 
+   1. `beforeTrack` - Positions the popup to be shown before the scroll track
+   2. `afterTrack` - Position it after the scroll track
+* `handleWidth` - Use to custom set the width of the fast scroll handle - Defaults to 18dp
+* `handleHeight` - Use to custom set the height of the fast scroll handle - Defaults to 18dp
+* `handleHasFixedSize` - TODO - currently setting this to false doesn`t do anything, as the size of the handle is independent of the item count
+* `addLastItemPadding` - By default the last item of the `RecyclerView` associated with the fast scroller has an extra padding of the height of the first visible item found, to disable this behaviour set this as `false`
+* `fastScrollDirection` - TODO - currently the fast scroller only works in the `vertical` direction
+
+##Advanced usage:
+
+* Different color popups can be shown based on the position of the item shown, to do this, implement the `OnPopupViewUpdate` which overrides the 
+`onUpdate(position: Int, popupTextView: TextView)` which return void, but has an instance of the `TextView` used in popup, this can be used to change the background. 
+
+Ex: 
+
+    class MyAdapter : RecyclerView.Adapter .... implements OnPopupViewUpdate{
+        ....
+        override fun onChange(position: Int, popupTextView: TextView) {
+           // Do something with the TextView here
+           popupTextView.setBackground(....)
+           }
+    }
+#### Proguard: 
+There is no need for any additional proguard rules when using this. 
+
+#### TODO: 
+
+* Add support for `horizontal` fast scrolling
+* Make handle size flexible to item count in adapter
+* Fix 0 item bug, which makes the fast scroller visible 

build.gradle

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+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+
+buildscript {
+    ext.kotlin_version = '1.2.50'
+    repositories {
+        google()
+        jcenter()
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:3.1.3'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+
+        // NOTE: Do not place your application dependencies here; they belong
+        // in the individual module build.gradle files
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        jcenter()
+    }
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}

gradle/wrapper/gradle-wrapper.properties

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+#Tue Jun 26 19:01:24 IST 2018
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip

gradlew

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+#!/usr/bin/env sh
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=$(save "$@")
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+  cd "$(dirname "$0")"
+fi
+
+exec "$JAVACMD" "$@"