TextDrawable which can be used for drawing iconiс fonts

TextDrawable.java

import android.content.res.ColorStateList;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.graphics.Typeface;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.support.annotation.NonNull;
import android.text.TextPaint;
import android.view.View;

public class TextDrawable extends Drawable {
    @NonNull
    private String text;

    @NonNull
    private ColorStateList textColor;

    private float textSize;

    private boolean autoMirrored;

    @NonNull
    private final TextPaint paint;

    @NonNull
    private final Rect rect;

    private boolean boundsChanged;

    public TextDrawable() {
        text = "";
        textColor = ColorStateList.valueOf(Color.BLACK);
        textSize = 16;
        paint = new TextPaint();
        rect = new Rect();

        paint.setAntiAlias(true);
        paint.setTextAlign(Paint.Align.LEFT);
    }

    private void updatePaint() {
        updatePaint(false, false);
    }

    private void updatePaint(boolean updateBounds, @SuppressWarnings("SameParameterValue") boolean forcedInvalidate) {
        boolean colorChanged = updatePaintColor(getState());

        boolean textSizeChanged = false;

        float oldTextSize = paint.getTextSize();
        float newTextSize = textSize;

        if (Float.compare(oldTextSize, newTextSize) != 0) {
            paint.setTextSize(newTextSize);
            textSizeChanged = true;
        }

        if (textSizeChanged || updateBounds) {
            boundsChanged = false;

            paint.getTextBounds(text, 0, text.length(), rect);
            fitRect(rect, (int) textSize);
            setBounds(rect);
        }

        if (colorChanged || forcedInvalidate || boundsChanged) {
            invalidateSelf();
        }
    }

    private static void fitRect(Rect rect, int size) {
        int w = rect.width();
        if (size > w) {
            int d1 = (size - w) / 2;
            int d2 = size - w - d1;
            rect.left -= d1;
            rect.right += d2;
        }

        int h = rect.height();
        if (size > h) {
            int d1 = (size - h) / 2;
            int d2 = size - h - d1;
            rect.top -= d1;
            rect.bottom += d2;
        }
    }

    private boolean updatePaintColor(int[] state) {
        int oldColor = paint.getColor();
        int newColor = textColor.getColorForState(state, textColor.getDefaultColor());

        if (oldColor != newColor) {
            paint.setColor(newColor);
            return true;
        }

        return false;
    }

    @Override
    public boolean isStateful() {
        return textColor.isStateful();
    }

    @Override
    protected boolean onStateChange(int[] state) {
        return updatePaintColor(state);
    }

    public void setTypeface(@NonNull Typeface typeface) {
        paint.setTypeface(typeface);

        updatePaint(true, false);
    }

    @NonNull
    public String getText() {
        return text;
    }

    public void setText(String text) {
        this.text = text != null ? text : "";

        updatePaint(true, false);
    }

    public float getTextSize() {
        return textSize;
    }

    public void setTextSize(float textSize) {
        this.textSize = textSize;

        updatePaint();
    }

    public int getTextColor() {
        return textColor.getColorForState(getState(), textColor.getDefaultColor());
    }

    public void setTextColor(int color) {
        textColor = ColorStateList.valueOf(color);

        updatePaint();
    }

    @NonNull
    public ColorStateList getTextColorStateList() {
        return textColor;
    }

    public void setTextColorStateList(@NonNull ColorStateList color) {
        textColor = color;

        updatePaint();
    }

    public boolean isAutoMirrored() {
        return autoMirrored;
    }

    public void setAutoMirrored(boolean autoMirrored) {
        this.autoMirrored = autoMirrored;
    }

    @Override
    public void setAlpha(int alpha) {
        paint.setAlpha(alpha);
        invalidateSelf();
    }

    @Override
    public void setColorFilter(ColorFilter cf) {
        paint.setColorFilter(cf);
        invalidateSelf();
    }

    @Override
    public int getOpacity() {
        return PixelFormat.TRANSLUCENT;
    }

    protected void onBoundsChange(Rect bounds) {
        boundsChanged = true;
    }

    @Override
    public int getIntrinsicWidth() {
        return rect.width();
    }

    @Override
    public int getIntrinsicHeight() {
        return rect.height();
    }

    protected boolean needMirroring() {
        boolean rtl = false;

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            rtl = getLayoutDirection() == View.LAYOUT_DIRECTION_RTL;
        }

        return isAutoMirrored() && rtl;
    }

    @Override
    public void draw(@NonNull Canvas canvas) {
        final boolean needMirroring = needMirroring();

        if (needMirroring) {
            canvas.save();
            canvas.translate(rect.right - rect.left, 0);
            canvas.scale(-1.0f, 1.0f);
        }

        canvas.drawText(text, -rect.left, -rect.top, paint);

        if (needMirroring) {
            canvas.restore();
        }
    }
}