Android SystemUI分析之状态栏字体和图标颜色随背景而改变 |
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Android SystemUI分析之状态栏字体和图标颜色随背景而改变
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Android版本： 8.1 
切换桌面的时候我们可以看到，状态栏的数字和icon图标都变成颜色，假如我们开发的时候也要添加一个新的view到状态栏，就需要实现同样的方法。 实现这个功能，需要实现DarkReceiver这个接口。 interface DarkReceiver { void onDarkChanged(Rect area, float darkIntensity, int tint); }onDarkChanged就是在当背景色改变时，对应发生的监听回调。 下面开始看源码是怎么操作的 当Window 界面切换的时候，会调用setSystemUiVisibility 传到StatusBar里， @Override // CommandQueue public void setSystemUiVisibility(int vis, int fullscreenStackVis, int dockedStackVis, int mask, Rect fullscreenStackBounds, Rect dockedStackBounds) { 。。。//最后调用了mLightBarController mLightBarController.onSystemUiVisibilityChanged(fullscreenStackVis, dockedStackVis, mask, fullscreenStackBounds, dockedStackBounds, sbModeChanged, mStatusBarMode); }setSystemUiVisibility最后调用了mLightBarController，这里的mLightBarController是LightBarController onSystemUiVisibilityChanged public void onSystemUiVisibilityChanged(int fullscreenStackVis, int dockedStackVis, int mask, Rect fullscreenStackBounds, Rect dockedStackBounds, boolean sbModeChanged, int statusBarMode) { int oldFullscreen = mFullscreenStackVisibility; int newFullscreen = (oldFullscreen & ~mask) | (fullscreenStackVis & mask); int diffFullscreen = newFullscreen ^ oldFullscreen; int oldDocked = mDockedStackVisibility; int newDocked = (oldDocked & ~mask) | (dockedStackVis & mask); int diffDocked = newDocked ^ oldDocked; if ((diffFullscreen & View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR) != 0 || (diffDocked & View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR) != 0 || sbModeChanged || !mLastFullscreenBounds.equals(fullscreenStackBounds) || !mLastDockedBounds.equals(dockedStackBounds)) { mFullscreenLight = isLight(newFullscreen, statusBarMode, View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR); mDockedLight = isLight(newDocked, statusBarMode, View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR); updateStatus(fullscreenStackBounds, dockedStackBounds); } mFullscreenStackVisibility = newFullscreen; mDockedStackVisibility = newDocked; mLastStatusBarMode = statusBarMode; mLastFullscreenBounds.set(fullscreenStackBounds); mLastDockedBounds.set(dockedStackBounds); }如果参数比较有改变，则会走向updateStatus private void updateStatus(Rect fullscreenStackBounds, Rect dockedStackBounds) { boolean hasDockedStack = !dockedStackBounds.isEmpty(); // If both are light or fullscreen is light and there is no docked stack, all icons get // dark. if ((mFullscreenLight && mDockedLight) || (mFullscreenLight && !hasDockedStack)) { mStatusBarIconController.setIconsDarkArea(null); mStatusBarIconController.getTransitionsController().setIconsDark(true, animateChange()); } // If no one is light or the fullscreen is not light and there is no docked stack, // all icons become white. else if ((!mFullscreenLight && !mDockedLight) || (!mFullscreenLight && !hasDockedStack)) { mStatusBarIconController.getTransitionsController().setIconsDark( false, animateChange()); } // Not the same for every stack, magic! else { Rect bounds = mFullscreenLight ? fullscreenStackBounds : dockedStackBounds; if (bounds.isEmpty()) { mStatusBarIconController.setIconsDarkArea(null); } else { mStatusBarIconController.setIconsDarkArea(bounds); } mStatusBarIconController.getTransitionsController().setIconsDark(true, animateChange()); } }最终都会走向mStatusBarIconController。 private final DarkIconDispatcher mStatusBarIconController;这里的DarkIconDispatcher是个接口，实际对象是他的继承者DarkIconDispatcherImpl 这里的setIconsDarkArea public void setIconsDarkArea(Rect darkArea) { if (darkArea == null && mTintArea.isEmpty()) { return; } if (darkArea == null) { mTintArea.setEmpty(); } else { mTintArea.set(darkArea); } applyIconTint(); } private void applyIconTint() { for (int i = 0; i |
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