界面背景半透明 about weibo HOT 7 CLOSED

mParams.windowAnimations = android.R.style.Animation_Toast;

/**
     * 调整窗口的透明度
     *
     * @param from
     * @param to
     */
    private void setOutBackground(float from, float to) {
        final WindowManager.LayoutParams lp = getWindow().getAttributes();
        ValueAnimator valueAnimator = ValueAnimator.ofFloat(from, to);
        valueAnimator.setDuration(600);
        valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                lp.alpha = (float) animation.getAnimatedValue();
                getWindow().setAttributes(lp);
            }
        });
        valueAnimator.start();
    }