有什么便捷的方式实现activity变暗的效果

1768次阅读  |  发布于5年以前

有什么便捷的方式实现activity变暗的效果

private void dimBackground(final float from, final float to) {
        final Window window = getWindow();
        ValueAnimator valueAnimator = ValueAnimator.ofFloat(from, to);
        valueAnimator.setDuration(500);
        valueAnimator.addUpdateListener(new AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                WindowManager.LayoutParams params = window.getAttributes();
                params.alpha = (Float) animation.getAnimatedValue();
                window.setAttributes(params);
            }
        });

        valueAnimator.start();
    }

亲测可用

    /** 窗口背景变暗*/
    dimBackground(1.0f,0.5f);

    /** 窗口背景变亮*/
    dimBackground(0.5f,1.0f);

更多参考资料

Copyright© 2013-2020

All Rights Reserved 京ICP备2023019179号-8