ExpandTextView.java 文件源码

public void expand() {
    if (!isExpand) {
        isExpand = true;
        mText.setTextColor(Color.TRANSPARENT);
        mExpandText.setTextColor(mTextColor);
        Animation animation = new Animation() {
            @Override
            protected void applyTransformation(float interpolatedTime, Transformation t) {
                ViewGroup.LayoutParams params = ExpandTextView.this.getLayoutParams();
                params.height = mStart + (int) ((mEnd - mStart) * interpolatedTime);
                setLayoutParams(params);
            }
        };
        animation.setDuration(500);
        startAnimation(animation);
    }

}