獲取狀態(tài)欄高度

public static int getStatusBarHeight(Context context) {
    int result = 0;
    int resourceId = context.getResources().getIdentifier("status_bar_height", "dimen", "android");
    if (resourceId > 0) {
        result = context.getResources().getDimensionPixelSize(resourceId);
    }
    return result;
}

或者

getWindow().getDecorView().setOnApplyWindowInsetsListener((v, insets) -> {
    int statuBarHeight = insets.getStableInsetTop();
    return insets;
});

獲取導航欄高度

public static int getNavigationBarHeight(Context context) {
    int result = 0;
    int resourceId = context.getResources().getIdentifier("navigation_bar_height", "dimen", "android");
    if (resourceId > 0) {
        result = context.getResources().getDimensionPixelSize(resourceId);
    }
    return result;
}

或者

getWindow().getDecorView().setOnApplyWindowInsetsListener((v, insets) -> {
    int navigationBarHeight = insets.getStableInsetBottom();
    return insets;
});

其他數(shù)據(jù)

系統(tǒng)的各種數(shù)據(jù)定義位于SDK的xml文件中：

android-30/data/res/values/dimens.xml

<dimen name="toast_y_offset">24dp</dimen>
<!-- Height of the status bar -->
<dimen name="status_bar_height">@dimen/status_bar_height_portrait</dimen>
<!-- Height of the status bar in portrait. The height should be
     Max((status bar content height + waterfall top size), top cutout size) -->
<dimen name="status_bar_height_portrait">24dp</dimen>
<!-- Height of the status bar in landscape. The height should be
     Max((status bar content height + waterfall top size), top cutout size) -->
<dimen name="status_bar_height_landscape">@dimen/status_bar_height_portrait</dimen>
<!-- Height of the bottom navigation / system bar. -->
<dimen name="navigation_bar_height">48dp</dimen>
<!-- Height of the bottom navigation bar in portrait; often the same as @dimen/navigation_bar_height -->
<dimen name="navigation_bar_height_landscape">48dp</dimen>
<!-- Width of the navigation bar when it is placed vertically on the screen -->
<dimen name="navigation_bar_width">48dp</dimen>

通過key可以獲取對應的值。

修改導航欄、狀態(tài)欄背景色

getWindow().setStatusBarColor(Color.RED);
getWindow().setNavigationBarColor(Color.RED);

源碼

導航欄和狀態(tài)欄源碼相似

#PhoneWindow
@Override
public void setStatusBarColor(int color) {
    mStatusBarColor = color;
    mForcedStatusBarColor = true;
    if (mDecor != null) {
        mDecor.updateColorViews(null, false /* animate */);
    }
}

#DecorView

public static final ColorViewAttributes STATUS_BAR_COLOR_VIEW_ATTRIBUTES =
        new ColorViewAttributes(SYSTEM_UI_FLAG_FULLSCREEN, FLAG_TRANSLUCENT_STATUS,
                Gravity.TOP, Gravity.LEFT, Gravity.RIGHT,
                Window.STATUS_BAR_BACKGROUND_TRANSITION_NAME,
                com.android.internal.R.id.statusBarBackground,
                FLAG_FULLSCREEN, ITYPE_STATUS_BAR);

public static final ColorViewAttributes NAVIGATION_BAR_COLOR_VIEW_ATTRIBUTES =
        new ColorViewAttributes(
                SYSTEM_UI_FLAG_HIDE_NAVIGATION, FLAG_TRANSLUCENT_NAVIGATION,
                Gravity.BOTTOM, Gravity.RIGHT, Gravity.LEFT,
                Window.NAVIGATION_BAR_BACKGROUND_TRANSITION_NAME,
                com.android.internal.R.id.navigationBarBackground,
                0 , ITYPE_NAVIGATION_BAR);


private final ColorViewState mStatusColorViewState = new ColorViewState(STATUS_BAR_COLOR_VIEW_ATTRIBUTES);
private final ColorViewState mNavigationColorViewState = new ColorViewState(NAVIGATION_BAR_COLOR_VIEW_ATTRIBUTES);

WindowInsets updateColorViews(WindowInsets insets, boolean animate) {
	
	...
	
    updateColorViewInt(mNavigationColorViewState, sysUiVisibility,
             calculateNavigationBarColor(), mWindow.mNavigationBarDividerColor, navBarSize,
             navBarToRightEdge || navBarToLeftEdge, navBarToLeftEdge,
             0 /* sideInset */, animate && !disallowAnimate,
             mForceWindowDrawsBarBackgrounds, controller);
	
	...
	
    updateColorViewInt(mStatusColorViewState, sysUiVisibility,
              calculateStatusBarColor(), 0, mLastTopInset,
              false /* matchVertical */, statusBarNeedsLeftInset, statusBarSideInset,
              animate && !disallowAnimate,
              mForceWindowDrawsBarBackgrounds, controller);

}

調(diào)用updateColorViews更新背景色的方法，還有如下位置：

#ViewRootImpl
private void performTraversals() {
	
	dispatchApplyInsets(host);

}

public void dispatchApplyInsets(View host) {
     mApplyInsetsRequested = false;
     WindowInsets insets = getWindowInsets(true /* forceConstruct */);
     host.dispatchApplyWindowInsets(insets);
	...
}

#View

public WindowInsets dispatchApplyWindowInsets(WindowInsets insets) {
    ...
    return onApplyWindowInsets(insets);
	...
}

#DecorView

@Override
public WindowInsets onApplyWindowInsets(WindowInsets insets) {
    ...
    insets = updateColorViews(insets, true);
    ...
    return insets;
}

關于WindowInsets

WindowInsets可以翻譯為窗口附加物，一般是指一個界面中，不由開發(fā)者直接控制的部分，例如：狀態(tài)欄、底部的導航欄等等。具體的類型在Type中有定義：

#WindowInsets.Type
static final int FIRST = 1 << 0;
static final int STATUS_BARS = FIRST;
static final int NAVIGATION_BARS = 1 << 1;
static final int CAPTION_BAR = 1 << 2;

static final int IME = 1 << 3;

static final int SYSTEM_GESTURES = 1 << 4;
static final int MANDATORY_SYSTEM_GESTURES = 1 << 5;
static final int TAPPABLE_ELEMENT = 1 << 6;

static final int DISPLAY_CUTOUT = 1 << 7;

static final int LAST = 1 << 8;
static final int SIZE = 9;
static final int WINDOW_DECOR = LAST;

可以向DecorView添加監(jiān)聽，處理WindowInsets

getWindow().getDecorView().setOnApplyWindowInsetsListener((v, insets) -> {
    return insets;
});

所以，可以在這里獲取導航欄和狀態(tài)欄的高度：

getWindow().getDecorView().setOnApplyWindowInsetsListener((v, insets) -> {
    int statuBarHeight = insets.getStableInsetTop();
    int navigationBarHeight = insets.getStableInsetBottom();
    return insets;
});

也可以修改導航欄和狀態(tài)欄的高度（好像沒有應用場景）：文章來源地址http://www.zghlxwxcb.cn/news/detail-520367.html

getWindow().getDecorView().setOnApplyWindowInsetsListener((v, insets) -> {
    int statuBarHeight = 0;
    int navigationBarHeight = 0;
    return insets.replaceSystemWindowInsets(0,statuBarHeight,0,navigationBarHeight);
;
});

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