code sample

Android set Text By Width

   /**
     * Sets the text size for a Paint object so a given string of text will be a
     * given width.
     *
     * @param paint       the Paint to set the text size for
     * @param desiredView the desired view
     * @param text        the text that should be that width
     */
    private static float setTextSizeByWidth(Paint paint, View desiredView,
                                             String text) {

        // Pick a reasonably large value for the test. Larger values produce
        // more accurate results, but may cause problems with hardware
        // acceleration. But there are workarounds for that, too; refer to
        // http://stackoverflow.com/questions/6253528/font-size-too-large-to-fit-in-cache
        final float testTextSize = 90f;

        // Get the bounds of the text, using our testTextSize.
        paint.setTextSize(testTextSize);
        Rect bounds = new Rect();
        String tmpText = "  " + text + "  ";
        paint.getTextBounds(tmpText, 0, tmpText.length(), bounds);


        // Calculate the desired size as a proportion of our testTextSize.
        float desiredTextSizeX = testTextSize * desiredView.getWidth() / bounds.width();
        float desiredTextSizeY = testTextSize * desiredView.getHeight() / bounds.height() * 1000;

//        desiredTextSizeX = desiredTextSizeX ;

        float desiredTextSize = Math.min(desiredTextSizeX, desiredTextSizeY);
        // Set the paint for that size.
        paint.setTextSize(desiredTextSize);
        return desiredTextSize;
    }