Add text to image in android programmatically

Question

I want to make an application just like opening screen of android.I am dynamically adding images to the rows of tableLayout. I have only defined tableLayout in xml file and remaining code is in java. I have added images successfully but i am not getting any help with setting text of that image (I want to display a text under image) and image to be a specific padding.How to do it?Thanks in advance.

Answer 1

Here's Kotlin version Arun's solution:

import org.jetbrains.anko.dip

fun Context.writeTextOnDrawable(drawableId: Int, text: String) =
        DrawableUtil.writeTextOnDrawableInternal(this, drawableId, text, 25, -2, 0)

object DrawableUtil {

    fun writeTextOnDrawableInternal(context: Context, drawableId: Int, text: String,
            textSizeDp: Int, horizontalOffset: Int, verticalOffset: Int): BitmapDrawable {

        val bm = BitmapFactory.decodeResource(context.resources, drawableId)
                .copy(Bitmap.Config.ARGB_8888, true)

        val tf = Typeface.create("Helvetica", Typeface.BOLD)

        val paint = Paint()
        paint.style = Paint.Style.FILL
        paint.color = Color.WHITE
        paint.typeface = tf
        paint.textAlign = Paint.Align.LEFT
        paint.textSize = context.dip(textSizeDp).toFloat()

        val textRect = Rect()
        paint.getTextBounds(text, 0, text.length, textRect)

        val canvas = Canvas(bm)

        //If the text is bigger than the canvas , reduce the font size
        if (textRect.width() >= canvas.getWidth() - 4)
            //the padding on either sides is considered as 4, so as to appropriately fit in the text
            paint.textSize = context.dip(12).toFloat()

        //Calculate the positions
        val xPos = canvas.width.toFloat()/2 + horizontalOffset  

        //"- ((paint.descent() + paint.ascent()) / 2)" is the distance from the baseline to the center.
        val yPos = (canvas.height / 2 - (paint.descent() + paint.ascent()) / 2) + verticalOffset

        canvas.drawText(text, xPos, yPos, paint)

        return BitmapDrawable(context.resources, bm)
    }
}

Answer 2

Use the following function to write Text on Images:

private BitmapDrawable writeTextOnDrawable(int drawableId, String text) {

    Bitmap bm = BitmapFactory.decodeResource(getResources(), drawableId)
            .copy(Bitmap.Config.ARGB_8888, true);

    Typeface tf = Typeface.create("Helvetica", Typeface.BOLD);

    Paint paint = new Paint();
    paint.setStyle(Style.FILL);
    paint.setColor(Color.WHITE);
    paint.setTypeface(tf);
    paint.setTextAlign(Align.CENTER);
    paint.setTextSize(convertToPixels(mContext, 11));

    Rect textRect = new Rect();
    paint.getTextBounds(text, 0, text.length(), textRect);

    Canvas canvas = new Canvas(bm);

    //If the text is bigger than the canvas , reduce the font size
    if(textRect.width() >= (canvas.getWidth() - 4))     //the padding on either sides is considered as 4, so as to appropriately fit in the text
        paint.setTextSize(convertToPixels(mContext, 7));        //Scaling needs to be used for different dpi's

    //Calculate the positions
    int xPos = (canvas.getWidth() / 2) - 2;     //-2 is for regulating the x position offset

    //"- ((paint.descent() + paint.ascent()) / 2)" is the distance from the baseline to the center.
    int yPos = (int) ((canvas.getHeight() / 2) - ((paint.descent() + paint.ascent()) / 2)) ;  

    canvas.drawText(text, xPos, yPos, paint);

    return new BitmapDrawable(getResources(), bm);
}



public static int convertToPixels(Context context, int nDP)
{
    final float conversionScale = context.getResources().getDisplayMetrics().density;

    return (int) ((nDP * conversionScale) + 0.5f) ;

}

Answer 3

What you can instead do is to put a TextView in overlay to a ImageView using a RelativeLayout :)