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        目前市场上的好多应用都已经使用了沉浸式，实现方式可以有多中，其中在主题中可以设置两个属性：

//这两个属性默认都是false，//windowTranslucentStatus指的是状态栏是半透明，//当这个值为false时，可以设置statusBarColor的颜色，//当为true时,statusBarColor不起作用,内容会处于状态栏（半透明）的下面
   
    true
   //windowTranslucentNavigation指的是导航栏的半透明//当这个值为false时，可以设置navigationBarColor的颜色//当这个值为true时，navigationBarColor不起作用，内容会处于导航栏（半透明）和状态栏下面
   
    true
   
   
    #ff0000
   
   
    #ff0000
   

当需要把状态栏的半透明换成和底背景一样时，只需要把windowtranslucentStatus改成false或是去掉即可，这两个属性是在PhoneWindow中获取并设置的，让我们来看一下generateLayout(DecorView decor)（这个方法是在setContentView()中被调用到的）这个方法是如何设置的：

if (a.getBoolean(R.styleable.Window_windowTranslucentStatus,        false)) {    setFlags(FLAG_TRANSLUCENT_STATUS, FLAG_TRANSLUCENT_STATUS            & (~getForcedWindowFlags()));}if (a.getBoolean(R.styleable.Window_windowTranslucentNavigation,        false)) {    setFlags(FLAG_TRANSLUCENT_NAVIGATION, FLAG_TRANSLUCENT_NAVIGATION            & (~getForcedWindowFlags()));}

if (!mForcedStatusBarColor) {    mStatusBarColor = a.getColor(R.styleable.Window_statusBarColor, 0xFF000000);}if (!mForcedNavigationBarColor) {    mNavigationBarColor = a.getColor(R.styleable.Window_navigationBarColor, 0xFF000000);}

这里获取到颜色后会在DecorView中进行设置，

private int calculateStatusBarColor() {    return calculateStatusBarColor(mWindow.getAttributes().flags,            mSemiTransparentStatusBarColor, mWindow.mStatusBarColor);}public static int calculateStatusBarColor(int flags, int semiTransparentStatusBarColor,        int statusBarColor) {    return (flags & FLAG_TRANSLUCENT_STATUS) != 0 ? semiTransparentStatusBarColor            : (flags & FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS) != 0 ? statusBarColor            : Color.BLACK;}

这里就是决定statusBarColor的颜色到底是哪一个。

        对于这里的所有设置都可以在代码中进行设置，具体的可以查看郭霖的这一篇。

        不管是在代码中设置还是在主题中设置，最后决定权还是在DecorView这里，

WindowInsets updateColorViews(WindowInsets insets, boolean animate) {    WindowManager.LayoutParams attrs = mWindow.getAttributes();    //主题中设置的系统UI属性在这里可以获取 attrs.systemUiVisibility    //代码中设置的系统UI属性在这里可以获取 getWindowSystemUiVisibility()    int sysUiVisibility = attrs.systemUiVisibility | getWindowSystemUiVisibility();        ...        // When we expand the window with FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS, we still need    // to ensure that the rest of the view hierarchy doesn't notice it, unless they've    // explicitly asked for it.    boolean consumingNavBar = (attrs.flags & FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS) != 0                    && (sysUiVisibility & SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION) == 0                    && (sysUiVisibility & SYSTEM_UI_FLAG_HIDE_NAVIGATION) == 0                    || mLastShouldAlwaysConsumeNavBar;    // If we didn't request fullscreen layout, but we still got it because of the    // mForceWindowDrawsStatusBarBackground flag, also consume top inset.    boolean consumingStatusBar = (sysUiVisibility & SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN) == 0            && (sysUiVisibility & FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS) == 0            && (attrs.flags & FLAG_LAYOUT_IN_SCREEN) == 0            && (attrs.flags & FLAG_LAYOUT_INSET_DECOR) == 0            && mForceWindowDrawsStatusBarBackground            && mLastTopInset != 0;    int consumedTop = consumingStatusBar ? mLastTopInset : 0;    int consumedRight = consumingNavBar ? mLastRightInset : 0;    int consumedBottom = consumingNavBar ? mLastBottomInset : 0;    int consumedLeft = consumingNavBar ? mLastLeftInset : 0;    if (mContentRoot != null            && mContentRoot.getLayoutParams() instanceof ViewGroup.MarginLayoutParams) {        ViewGroup.MarginLayoutParams lp = (ViewGroup.MarginLayoutParams) mContentRoot.getLayoutParams();        if (lp.topMargin != consumedTop || lp.rightMargin != consumedRight                || lp.bottomMargin != consumedBottom || lp.leftMargin != consumedLeft) {            lp.topMargin = consumedTop;            lp.rightMargin = consumedRight;            lp.bottomMargin = consumedBottom;            lp.leftMargin = consumedLeft;            mContentRoot.setLayoutParams(lp);            if (insets == null) {                // The insets have changed, but we're not currently in the process                // of dispatching them.                requestApplyInsets();            }        }        if (insets != null) {            insets = insets.replaceSystemWindowInsets(                    insets.getSystemWindowInsetLeft() - consumedLeft,                    insets.getSystemWindowInsetTop() - consumedTop,                    insets.getSystemWindowInsetRight() - consumedRight,                    insets.getSystemWindowInsetBottom() - consumedBottom);        }    }    if (insets != null) {        insets = insets.consumeStableInsets();    }    return insets;}