LyricView.java 文件源码

private void initView()
{
    mPaint = new TextPaint();
    mPaint.setTextSize(mTextSize);
    mPaint.setTextAlign(Align.CENTER);
    mPaint.setAntiAlias(true);

    // 计算字体高度
    FontMetrics fm = mPaint.getFontMetrics();
    mTextHeight = (int) (fm.bottom - fm.top);

    // 滚动动画
    mLineAnimator = new ValueAnimator();
    mLineAnimator.setIntValues(0, 100);
    mLineAnimator.setDuration(mLineAnimDuration);
    mLineAnimator.addUpdateListener(new AnimatorUpdateListener()
    {
        @Override
        public void onAnimationUpdate(ValueAnimator animation)
        {
            int value = (Integer) animation.getAnimatedValue();
            float percent = 1 - (float) value / 100;
            mLineOffset = (int) (mAnimOffset * percent); // 更新偏移值，重绘View
            invalidate();
        }
    });
}