SystemUI-StatusBar-虚拟按键

1) StatusBar.start ->createAndAddWindows()->addStatusBarWindow()->makeStatusBarView()->

2) makeStatusBarView()->createNavigationBar()->NavigationBarFragment.create()->

3)  create(Context context, FragmentListener listener)->
    View navigationBarView = LayoutInflater.from(context).inflate(R.layout.navigation_bar_window, null);->
    FragmentHostManager fragmentHost = FragmentHostManager.get(navigationBarView);
    NavigationBarFragment fragment = new NavigationBarFragment();
    fragmentHost.getFragmentManager().beginTransaction().replace(R.id.navigation_bar_frame, fragment, TAG).commit(); ->
    onCreate()->onCreateView()->
    inflater.inflate(R.layout.navigation_bar, container, false);
    

4)由navigation_bar.xml可知查看自定义View
NavigationBarView.java
NavigationBarInflaterView.java

4.1)NavigationBarView.java

NavigationBarView(Context context, AttributeSet attrs)->

onFinishInflate()->

reloadNavIcons->

updateIcons()->

updateIcons()加载对应图标->

4.2）NavigationBarInflaterView.java

根据自定义view的调用顺序：

createInflaters()->onFinishInflate()->inflateChildren()->inflateLayout(String newLayout)->

4.2.1)inflateLayout(String newLayout)

inflateLayout(String newLayout)->getDefaultLayout()->mContext.getString(R.string.config_navBarLayout);获得对应菜单->

inflateLayout()->

inflateButtons(start, mHorizontal.findViewById(R.id.ends_group),false /* landscape */, true /* start */);->

inflateButton(buttons[i], parent, landscape, start);->

View v = createView(buttonSpec, parent, inflater);根据buttonSpec来确定加载对应的布局->

5）KeyButtonView.java

onTouchEvent()->

sendEvent(KeyEvent....)->