Android随着scrollView或者recyclerView滑动状态栏颜色渐变效果

scroll.setScrollViewListener(new ScrollView.OnScrollViewListener() {
@Override
public void onScollChanged(int l, int t, int oldl, int oldt) {
//在这里做颜色渐变的操作
}
});

recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
}

@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
//在这里做颜色渐变的操作
}
});

private int tempY = 0;
private float duration = 150.0f;//在0-150之间去改变头部的透明度
private ArgbEvaluator evaluator = new ArgbEvaluator();
private RecyclerView.OnScrollListener listener = new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
tempY += dy;

// 滚动的总距离相对0-150之间有一个百分比，头部的透明度也是从初始值变动到不透明，通过距离的百分比，得到透明度对应的值
// 如果小于0那么透明度为初始值，如果大于150为不透明状态

int bgColor = 0X553190E8;
if (tempY < 0) {
bgColor = 0X553190E8;
} else if (tempY > 150) {
bgColor = 0XFF3190E8;
} else {
bgColor = (int) evaluator.evaluate(tempY / duration, 0X553190E8, 0XFF3190E8);
}

title_layout.setBackgroundColor(bgColor);

}
};

final int height = DeviceUtil.dp_to_px(this, 150);
scroll.setScrollViewListener(new ObservableScrollView.OnScrollViewListener() {
@Override
public void onScollChanged(int l, int t, int oldl, int oldt) {
if (t > height) {
t = height;
}
title_layout.setBackgroundColor(Color.argb(Math.round(t * 256 * 0.7f / height), 0, 0, 0));

}
});