public Animator createAnimator()

in Unsplash/app/src/main/java/com/example/android/unsplash/transition/TextResize.java [106:222]
94 lines of code
9 McCabe index (conditional complexity)

    public Animator createAnimator(ViewGroup sceneRoot, TransitionValues startValues,
                                   TransitionValues endValues) {
        if (startValues == null || endValues == null) {
            return null;
        }

        final TextResizeData startData = (TextResizeData) startValues.values.get(DATA);
        final TextResizeData endData = (TextResizeData) endValues.values.get(DATA);
        if (startData.gravity != endData.gravity) {
            return null; // Can't deal with changes in gravity
        }

        final TextView textView = (TextView) endValues.view;
        float startFontSize = (Float) startValues.values.get(FONT_SIZE);
        // Capture the start bitmap -- we need to set the values to the start values first
        setTextViewData(textView, startData, startFontSize);
        final float startWidth = textView.getPaint().measureText(textView.getText().toString());

        final Bitmap startBitmap = captureTextBitmap(textView);

        if (startBitmap == null) {
            startFontSize = 0;
        }

        float endFontSize = (Float) endValues.values.get(FONT_SIZE);

        // Set the values to the end values
        setTextViewData(textView, endData, endFontSize);

        final float endWidth = textView.getPaint().measureText(textView.getText().toString());

        // Capture the end bitmap
        final Bitmap endBitmap = captureTextBitmap(textView);
        if (endBitmap == null) {
            endFontSize = 0;
        }

        if (startFontSize == 0 && endFontSize == 0) {
            return null; // Can't animate null bitmaps
        }

        // Set the colors of the TextView so that nothing is drawn.
        // Only draw the bitmaps in the overlay.
        final ColorStateList textColors = textView.getTextColors();
        final ColorStateList hintColors = textView.getHintTextColors();
        final int highlightColor = textView.getHighlightColor();
        final ColorStateList linkColors = textView.getLinkTextColors();
        textView.setTextColor(Color.TRANSPARENT);
        textView.setHintTextColor(Color.TRANSPARENT);
        textView.setHighlightColor(Color.TRANSPARENT);
        textView.setLinkTextColor(Color.TRANSPARENT);

        // Create the drawable that will be animated in the TextView's overlay.
        // Ensure that it is showing the start state now.
        final SwitchBitmapDrawable drawable = new SwitchBitmapDrawable(textView, startData.gravity,
                startBitmap, startFontSize, startWidth, endBitmap, endFontSize, endWidth);
        textView.getOverlay().add(drawable);

        // Properties: left, top, font size, text color
        final PropertyValuesHolder leftProp =
                PropertyValuesHolder.ofFloat("left", startData.paddingLeft, endData.paddingLeft);
        final PropertyValuesHolder topProp =
                PropertyValuesHolder.ofFloat("top", startData.paddingTop, endData.paddingTop);
        final PropertyValuesHolder rightProp = PropertyValuesHolder.ofFloat("right",
                startData.width - startData.paddingRight, endData.width - endData.paddingRight);
        final PropertyValuesHolder bottomProp = PropertyValuesHolder.ofFloat("bottom",
                startData.height - startData.paddingBottom, endData.height - endData.paddingBottom);
        final PropertyValuesHolder fontSizeProp =
                PropertyValuesHolder.ofFloat("fontSize", startFontSize, endFontSize);
        final ObjectAnimator animator;
        if (startData.textColor != endData.textColor) {
            final PropertyValuesHolder textColorProp = PropertyValuesHolder.ofObject("textColor",
                    new ArgbEvaluator(), startData.textColor, endData.textColor);
            animator = ObjectAnimator.ofPropertyValuesHolder(drawable,
                    leftProp, topProp, rightProp, bottomProp, fontSizeProp, textColorProp);
        } else {
            animator = ObjectAnimator.ofPropertyValuesHolder(drawable,
                    leftProp, topProp, rightProp, bottomProp, fontSizeProp);
        }

        final float finalFontSize = endFontSize;
        AnimatorListenerAdapter listener = new AnimatorListenerAdapter() {
            @Override
            public void onAnimationEnd(Animator animation) {
                textView.getOverlay().remove(drawable);
                textView.setTextColor(textColors);
                textView.setHintTextColor(hintColors);
                textView.setHighlightColor(highlightColor);
                textView.setLinkTextColor(linkColors);
            }

            @Override
            public void onAnimationPause(Animator animation) {
                textView.setTextSize(TypedValue.COMPLEX_UNIT_PX, drawable.getFontSize());
                final int paddingLeft = Math.round(drawable.getLeft());
                final int paddingTop = Math.round(drawable.getTop());
                final float fraction = animator.getAnimatedFraction();
                final int paddingRight = Math.round(interpolate(startData.paddingRight,
                        endData.paddingRight, fraction));
                final int paddingBottom = Math.round(interpolate(startData.paddingBottom,
                        endData.paddingBottom, fraction));
                textView.setPadding(paddingLeft, paddingTop, paddingRight, paddingBottom);
                textView.setTextColor(drawable.getTextColor());
            }

            @Override
            public void onAnimationResume(Animator animation) {
                textView.setTextSize(TypedValue.COMPLEX_UNIT_PX, finalFontSize);
                textView.setPadding(endData.paddingLeft, endData.paddingTop,
                        endData.paddingRight, endData.paddingBottom);
                textView.setTextColor(endData.textColor);
            }
        };
        animator.addListener(listener);
        animator.addPauseListener(listener);
        return animator;
    }