Android Word/Letter Tracing SDK is a complet solution to build apps for kids learning in pure kotlin

Last update: Oct 16, 2022

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Overview

Android Word Tracing SDK

Android Word/Letter Tracing SDK is a complet solution to build apps for kids learning in pure kotlin. It supports all kind of shapes and all language letters e.g. english, arabic, Urdu, hindi etc.

Getting Started

Step 1: Include it in your settings.gradle

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

Step 2: Include it in app gradle

	        implementation 'com.github.farimarwat:android-word-tracing-sdk:1.1'

XML Example

Custom Attributes

Attribute	Details
app:tlv_segmentfillimage	Drawable image for fill while moving finger
app:tlv_segmentfillcolor	Fill color while moving finger (Note: Use either fill color or image)
app:tlv_indicator	Drawable png image e.g. hand indication image
app:tlv_segmentbordercolor	Border color for shape
app:tlv_segmentbackgroundcolor	Background color for shape
app:tlv_segmentdot	Dots color on shape
app:tlv_segmentsize	Segment size for shape

Kotlin Code

val width = 420
val height = 420

binding.tlview.setLetter("A",width,height)

binding.tlview.addListener(object :AbcdkidsListener{
            override fun onDotTouched(progress: Float) {
                Log.e(TAG,"Progress: ${progress}")
            }

            override fun onSegmentFinished() {
                Log.e(TAG,"Segment Finished")
            }

            override fun onTraceFinished() {
                Log.e(TAG,"Tracing completed")
            }

        })

Supported letters at the moment A, B, C, D, E, F,P, R,U

Note: Due to short time I have included limited letters. I will gradually update letters Or you have made some shapes/letters then share it with me so I include it in next release

Custom Shape/letters

If you want to build your own custom shape/letter(of any language) then you have to familiar with canvas PATH in android. It is as simple as ABC. Just create a path and use as below. For instance I want to make letter 'A' which has 3 segments:

      val path = Path()
       path.moveTo(width*0.19f,height*0.9f)
        path.lineTo(width*0.45f,height*0.08f)

        path.moveTo(width*0.46f,height*0.08f)
        path.lineTo(width*0.76f,height*0.9f)

        path.moveTo(width*0.32f,height*0.62f)
        path.lineTo(width*0.62f,height*0.62f)
		
        binding.tlview.setLetter(path)

Rules for custom shapes/letters

I have built all the letters using width and height 420,420. If you change the size then you may face unexpacted result in your shapes/letters. Another point to note that if you move finger and the fill does not hide the end then your path is wrong. So every thing is the PATH creation and do not blam the library.