Text badge drawable

TextBadgeDrawable.java

public class TextBadgeDrawable extends Drawable {
    private Paint mPaint;
    private Rect mBounds;
    private Rect mTextBounds;
    private RectF mRectF;
    private int mColor;
    private String mText;

    public TextBadgeDrawable() {
        mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mBounds = new Rect();
        mTextBounds = new Rect();
        mRectF = new RectF();
        setBounds(0, 0, 60, 40);
    }

    public void setConfiguration(String text, int color) {
        mText = text;
        mColor = color;
    }

    @Override
    public void draw(Canvas canvas) {
        mBounds = getBounds();
        //Do not use canvas.getClipBounds(),due to canvas delivered from parent container view.
        //canvas.getClipBounds(mBounds);

        canvas.drawColor(Color.TRANSPARENT);

        mPaint.setColor(mColor);
        mPaint.setTextSize(28f);

        //Draw text center,refer to http://chris.banes.me/2014/03/27/measuring-text/
        mPaint.getTextBounds(mText, 0, mText.length(), mTextBounds);
        float textHeight = mTextBounds.height();
        float textWidth = mPaint.measureText(mText);
        canvas.drawText(mText, mBounds.centerX() - textWidth / 2f, mBounds.centerY() + textHeight / 2f, mPaint);

        mPaint.setStrokeWidth(3f);
        mPaint.setStyle(Paint.Style.STROKE);
        mRectF.left = mBounds.left;
        mRectF.top = mBounds.top;
        mRectF.right = mBounds.right;
        mRectF.bottom = mBounds.bottom;
        canvas.drawRoundRect(mRectF, 8f, 8f, mPaint);
    }

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

    @Override
    public void setColorFilter(ColorFilter colorFilter) {
        mPaint.setColorFilter(colorFilter);
        invalidateSelf();
    }

    @Override
    public int getOpacity() {
        // not sure, so be safe
        return PixelFormat.TRANSLUCENT;
    }

}