How to have an image with a dynamic text in it, all in a drawable, like the “today” action item on Google Calendar app?

Question

Background

Google Calendar app has an action item that dynamically change according to the current day (\"today\"):

I\'m required to do a very similar

Answer 1

OK, found the answer about how to have the same font for the TextPaint of the Drawable class I've made:

mPaint.typeface = ResourcesCompat.getFont(context, R.font.lato)

The result:

Here's the full implementation of this class:

class TextDrawable(context: Context, text: CharSequence) : Drawable() {
    companion object {
        private val DEFAULT_COLOR = Color.WHITE
        private val DEFAULT_TEXT_SIZE_IN_DP = 12
    }

    private val mTextBounds = Rect()
    private val mPaint: TextPaint = TextPaint(Paint.ANTI_ALIAS_FLAG)
    private val mDrawable: Drawable?

    var text: CharSequence = text
        set (value) {
            field = value
            invalidateSelf()
        }

    init {
        mPaint.typeface = ResourcesCompat.getFont(context, R.font.lato)
        mPaint.color = DEFAULT_COLOR
        mPaint.textAlign = Align.CENTER
        val textSize = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, DEFAULT_TEXT_SIZE_IN_DP.toFloat(), context.resources.displayMetrics)
        mPaint.textSize = textSize
        mDrawable = AppCompatResources.getDrawable(context, R.drawable.ic_backtodate)
        mDrawable!!.setBounds(0, 0, mDrawable.intrinsicWidth, mDrawable.intrinsicHeight)
    }

    override fun draw(canvas: Canvas) {
        val bounds = bounds
        mDrawable!!.draw(canvas)
        mPaint.getTextBounds(text.toString(), 0, text.length, mTextBounds);
        val textHeight = mTextBounds.bottom - mTextBounds.top
        canvas.drawText(text as String?, (bounds.right / 2).toFloat(), (bounds.bottom.toFloat() + textHeight + 1) / 2, mPaint)
    }

    override fun getOpacity(): Int = mPaint.alpha
    override fun getIntrinsicWidth(): Int = mDrawable!!.intrinsicWidth
    override fun getIntrinsicHeight(): Int = mDrawable!!.intrinsicHeight

    override fun setAlpha(alpha: Int) {
        mPaint.alpha = alpha
        invalidateSelf()
    }

    override fun setColorFilter(filter: ColorFilter?) {
        mPaint.colorFilter = filter
        invalidateSelf()
    }

}

EDIT: this code is now complete and works well. It should work fine, and is partially based on Calendar app itself, as was recommended to me to look at (here and here) .