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Android SystemUI之导航栏（四）_android 11 systemui 导航栏添加按钮

作者：我家自动化 | 2024-03-11 13:23:05

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android 11 systemui 导航栏添加按钮

一、View结构

 

 二、导航栏的创建

1.SystemUI\src\com\android\systemui\statusbar\phone\StatusBar.java

从导航栏的入口看。

  1.  protected void makeStatusBarView(@Nullable RegisterStatusBarResult result) {
  2.         final Context context = mContext;
  3.         updateDisplaySize(); // populates mDisplayMetrics
  4.         updateResources();
  5.         updateTheme();
  6.  
  7.         inflateStatusBarWindow();  //将R.layout.super_status_bar布局文件构建成对应的视图。
  8.  
  9.         ....
  10.  
  11.         createNavigationBar(result); //创建导航栏
  1.  // TODO(b/117478341): This was left such that CarStatusBar can override this method.
  2.     // Try to remove this.
  3.     protected void createNavigationBar(@Nullable RegisterStatusBarResult result) {
  4.         mNavigationBarController.createNavigationBars(true /* includeDefaultDisplay */, result);
  5.     }

2.SystemUI\src\com\android\systemui\statusbar\NavigationBarController.java

进入createNavigationBar方法，发现主要是用NavigationBarFragment来管理。

  1.   void createNavigationBar(Display display, RegisterStatusBarResult result) {
  2.         if (display == null) {
  3.             return;
  4.         }
  5.  
  6.         final int displayId = display.getDisplayId();
  7.         final boolean isOnDefaultDisplay = displayId == DEFAULT_DISPLAY;
  8.         final IWindowManager wms = WindowManagerGlobal.getWindowManagerService();
  9.  
  10.         try {
  11.             if (!wms.hasNavigationBar(displayId)) {
  12.                 return;
  13.             }
  14.         } catch (RemoteException e) {
  15.             // Cannot get wms, just return with warning message.
  16.             Log.w(TAG, "Cannot get WindowManager.");
  17.             return;
  18.         }
  19.         final Context context = isOnDefaultDisplay
  20.                 ? mContext
  21.                 : mContext.createDisplayContext(display);
  22.         NavigationBarFragment.create(context, (tag, fragment) -> {
  23.             NavigationBarFragment navBar = (NavigationBarFragment) fragment;
  24.  
  25.             // Unfortunately, we still need it because status bar needs LightBarController
  26.             // before notifications creation. We cannot directly use getLightBarController()
  27.             // from NavigationBarFragment directly.
  28.             LightBarController lightBarController = isOnDefaultDisplay
  29.                     ? Dependency.get(LightBarController.class)
  30.                     : new LightBarController(context,
  31.                             Dependency.get(DarkIconDispatcher.class),
  32.                             Dependency.get(BatteryController.class),
  33.                             Dependency.get(NavigationModeController.class));
  34.             navBar.setLightBarController(lightBarController);
  35.  
  36.             // TODO(b/118592525): to support multi-display, we start to add something which is
  37.             //                    per-display, while others may be global. I think it's time to add
  38.             //                    a new class maybe named DisplayDependency to solve per-display
  39.             //                    Dependency problem.
  40.             AutoHideController autoHideController = isOnDefaultDisplay
  41.                     ? Dependency.get(AutoHideController.class)
  42.                     : new AutoHideController(context, mHandler,
  43.                             Dependency.get(IWindowManager.class));
  44.             navBar.setAutoHideController(autoHideController);
  45.             navBar.restoreAppearanceAndTransientState();
  46.             mNavigationBars.append(displayId, navBar);
  47.  
  48.             if (result != null) {
  49.                 navBar.setImeWindowStatus(display.getDisplayId(), result.mImeToken,
  50.                         result.mImeWindowVis, result.mImeBackDisposition,
  51.                         result.mShowImeSwitcher);
  52.             }
  53.         });
  54.     }

3.SystemUI\src\com\android\systemui\statusbar\phone\NavigationBarFragment.java

创建navigationBarView 并且把navigationBarView添加到windowManager中。

  1. public static View create(Context context, FragmentListener listener) {
  2.         WindowManager.LayoutParams lp = new WindowManager.LayoutParams(
  3.                 LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT,
  4.                 WindowManager.LayoutParams.TYPE_NAVIGATION_BAR,
  5.                 WindowManager.LayoutParams.FLAG_TOUCHABLE_WHEN_WAKING
  6.                         | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
  7.                         | WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL
  8.                         | WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH
  9.                         | WindowManager.LayoutParams.FLAG_SPLIT_TOUCH
  10.                         | WindowManager.LayoutParams.FLAG_SLIPPERY,
  11.                 PixelFormat.TRANSLUCENT);
  12.         lp.token = new Binder();
  13.         lp.setTitle("NavigationBar" + context.getDisplayId());
  14.         lp.accessibilityTitle = context.getString(R.string.nav_bar);
  15.         lp.windowAnimations = 0;
  16.         lp.privateFlags |= WindowManager.LayoutParams.PRIVATE_FLAG_COLOR_SPACE_AGNOSTIC;
  17.  
  18.         View navigationBarView = LayoutInflater.from(context).inflate(
  19.                 R.layout.navigation_bar_window, null);
  20.  
  21.         if (DEBUG) Log.v(TAG, "addNavigationBar: about to add " + navigationBarView);
  22.         if (navigationBarView == null) return null;
  23.  
  24.         final NavigationBarFragment fragment = FragmentHostManager.get(navigationBarView)
  25.                 .create(NavigationBarFragment.class);
  26.         navigationBarView.addOnAttachStateChangeListener(new View.OnAttachStateChangeListener() {
  27.             @Override
  28.             public void onViewAttachedToWindow(View v) {
  29.                 final FragmentHostManager fragmentHost = FragmentHostManager.get(v);
  30.                 fragmentHost.getFragmentManager().beginTransaction()
  31.                         .replace(R.id.navigation_bar_frame, fragment, TAG)
  32.                         .commit();
  33.                 fragmentHost.addTagListener(TAG, listener);
  34.             }
  35.  
  36.             @Override
  37.             public void onViewDetachedFromWindow(View v) {
  38.                 FragmentHostManager.removeAndDestroy(v);
  39.                 navigationBarView.removeOnAttachStateChangeListener(this);
  40.             }
  41.         });
  42.         context.getSystemService(WindowManager.class).addView(navigationBarView, lp);
  43.         return navigationBarView;
  44.     }

4.看下NavigationBarFragment的生命周期。onCreateView()里，导航栏的真正的rootView。

  1.   @Override
  2.     public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
  3.             Bundle savedInstanceState) {
  4.         return inflater.inflate(R.layout.navigation_bar, container, false);
  5.     }

5.SystemUI\res\layout\navigation_bar.xml。

进入导航栏的真正根布局：navigation_bar.xml，好吧又是自定义view，NavigationBarView和NavigationBarInflaterView都要仔细研读。

  1. <com.android.systemui.statusbar.phone.NavigationBarView
  2.     xmlns:android="http://schemas.android.com/apk/res/android"
  3.     xmlns:systemui="http://schemas.android.com/apk/res-auto"
  4.     android:layout_height="match_parent"
  5.     android:layout_width="match_parent"
  6.     android:background="@drawable/system_bar_background">
  7.  
  8.     <com.android.systemui.CornerHandleView
  9.         android:id="@+id/assist_hint_left"
  10.         android:layout_width="36dp"
  11.         android:layout_height="36dp"
  12.         android:layout_gravity="left|bottom"
  13.         android:rotation="270"
  14.         android:visibility="gone"/>
  15.     <com.android.systemui.CornerHandleView
  16.         android:id="@+id/assist_hint_right"
  17.         android:layout_width="36dp"
  18.         android:layout_height="36dp"
  19.         android:layout_gravity="right|bottom"
  20.         android:rotation="180"
  21.         android:visibility="gone"/>
  22.  
  23.     <com.android.systemui.statusbar.phone.NavigationBarInflaterView
  24.         android:id="@+id/navigation_inflater"
  25.         android:layout_width="match_parent"
  26.         android:layout_height="match_parent" />
  27.  
  28. </com.android.systemui.statusbar.phone.NavigationBarView>

6.SystemUI\src\com\android\systemui\statusbar\phone\NavigationBarInflaterView.java；继承自FrameLayout

看下onFinishInflate()方法，这是view的生命周期，每个view被inflate之后都会回调。

  1.  @Override
  2.     protected void onFinishInflate() {
  3.         super.onFinishInflate();
  4.         inflateChildren();
  5.         clearViews();
  6.         inflateLayout(getDefaultLayout());
  7.     }
  8.  
  9.     private void inflateChildren() {
  10.         removeAllViews();
  11.         mHorizontal = (FrameLayout) mLayoutInflater.inflate(R.layout.navigation_layout,
  12.                 this /* root */, false /* attachToRoot */);
  13.         addView(mHorizontal);
  14.         mVertical = (FrameLayout) mLayoutInflater.inflate(R.layout.navigation_layout_vertical,
  15.                 this /* root */, false /* attachToRoot */);
  16.         addView(mVertical);
  17.         updateAlternativeOrder();
  18.     }
  1.  protected String getDefaultLayout() {
  2.         final int defaultResource = R.string.config_navBarLayout;/*QuickStepContract.isGesturalMode(mNavBarMode)
  3.                 ? R.string.config_navBarLayoutHandle
  4.                 : mOverviewProxyService.shouldShowSwipeUpUI()
  5.                         ? R.string.config_navBarLayoutQuickstep
  6.                         : R.string.config_navBarLayout;*/
  7.         return getContext().getString(defaultResource);
  8.     }
  9.  
  10.  
  11. //<!-- Nav bar button default ordering/layout -->
  12. 	<string name="config_navBarLayout" translatable="false">left;back,home,recent,screenshot;right</string>

看inflateLayout()：里面的newLayout参数很重要！！！根据上一个方法看到getDefaultLayout()，他return了一个在xml写死的字符串。再看inflateLayout方法，他解析分割了xml里配置的字符串，并传给了inflateButtons方法。

  1. protected void inflateLayout(String newLayout) {
  2.         mCurrentLayout = newLayout;
  3.         if (newLayout == null) {
  4.             newLayout = getDefaultLayout();
  5.         }
  6.         String[] sets = newLayout.split(GRAVITY_SEPARATOR, 3);
  7.         if (sets.length != 3) {
  8.             Log.d(TAG, "Invalid layout.");
  9.             newLayout = getDefaultLayout();
  10.             sets = newLayout.split(GRAVITY_SEPARATOR, 3);
  11.         }
  12.         String[] start = sets[0].split(BUTTON_SEPARATOR);
  13.         String[] center = sets[1].split(BUTTON_SEPARATOR);
  14.         String[] end = sets[2].split(BUTTON_SEPARATOR);
  15.         // Inflate these in start to end order or accessibility traversal will be messed up.
  16.         inflateButtons(start, mHorizontal.findViewById(R.id.ends_group),
  17.                 false /* landscape */, true /* start */);
  18.         inflateButtons(start, mVertical.findViewById(R.id.ends_group),
  19.                 true /* landscape */, true /* start */);
  20.  
  21.         inflateButtons(center, mHorizontal.findViewById(R.id.center_group),
  22.                 false /* landscape */, false /* start */);
  23.         inflateButtons(center, mVertical.findViewById(R.id.center_group),
  24.                 true /* landscape */, false /* start */);
  25.  
  26.         addGravitySpacer(mHorizontal.findViewById(R.id.ends_group));
  27.         addGravitySpacer(mVertical.findViewById(R.id.ends_group));
  28.  
  29.         inflateButtons(end, mHorizontal.findViewById(R.id.ends_group),
  30.                 false /* landscape */, false /* start */);
  31.         inflateButtons(end, mVertical.findViewById(R.id.ends_group),
  32.                 true /* landscape */, false /* start */);
  33.  
  34.         updateButtonDispatchersCurrentView();
  35.     }

再看inflateButtons()方法，遍历加载inflateButton：

  1. private void inflateButtons(String[] buttons, ViewGroup parent, boolean landscape,
  2.             boolean start) {
  3.         for (int i = 0; i < buttons.length; i++) {
  4.             inflateButton(buttons[i], parent, landscape, start);
  5.         }
  6.     }
  1.  @Nullable
  2.     protected View inflateButton(String buttonSpec, ViewGroup parent, boolean landscape,
  3.             boolean start) {
  4.         LayoutInflater inflater = landscape ? mLandscapeInflater : mLayoutInflater;
  5.         View v = createView(buttonSpec, parent, inflater);
  6.         if (v == null) return null;
  7.  
  8.         v = applySize(v, buttonSpec, landscape, start);
  9.         parent.addView(v);
  10.         addToDispatchers(v);
  11.         View lastView = landscape ? mLastLandscape : mLastPortrait;
  12.         View accessibilityView = v;
  13.         if (v instanceof ReverseRelativeLayout) {
  14.             accessibilityView = ((ReverseRelativeLayout) v).getChildAt(0);
  15.         }
  16.         if (lastView != null) {
  17.             accessibilityView.setAccessibilityTraversalAfter(lastView.getId());
  18.         }
  19.         if (landscape) {
  20.             mLastLandscape = accessibilityView;
  21.         } else {
  22.             mLastPortrait = accessibilityView;
  23.         }
  24.         return v;
  25.     }

我们来看createView()方法：以home按键为例，加载了home的button,其实是加载了R.layout.home的layout布局。

  1.  private View createView(String buttonSpec, ViewGroup parent, LayoutInflater inflater) {
  2.         View v = null;
  3.         String button = extractButton(buttonSpec);
  4.         if (LEFT.equals(button)) {
  5.             button = extractButton(NAVSPACE);
  6.         } else if (RIGHT.equals(button)) {
  7.             button = extractButton(MENU_IME_ROTATE);
  8.         }
  9.         if (HOME.equals(button)) {
  10.             v = inflater.inflate(R.layout.home, parent, false);
  11.         } else if (BACK.equals(button)) {
  12.             v = inflater.inflate(R.layout.back, parent, false);
  13.         } else if (RECENT.equals(button)) {
  14.             v = inflater.inflate(R.layout.recent_apps, parent, false);
  15.         } else if (SCREENSHOT.equals(button)) { //laiyw
  16.             v = inflater.inflate(R.layout.screenshot, parent, false);
  17.         } else if (MENU_IME_ROTATE.equals(button)) {
  18.             v = inflater.inflate(R.layout.menu_ime, parent, false);
  19.         } else if (NAVSPACE.equals(button)) {
  20.             v = inflater.inflate(R.layout.nav_key_space, parent, false);
  21.         } else if (CLIPBOARD.equals(button)) {
  22.             v = inflater.inflate(R.layout.clipboard, parent, false);
  23.         } else if (CONTEXTUAL.equals(button)) {
  24.             v = inflater.inflate(R.layout.contextual, parent, false);
  25.         } else if (HOME_HANDLE.equals(button)) {
  26.             v = inflater.inflate(R.layout.home_handle, parent, false);
  27.         } else if (IME_SWITCHER.equals(button)) {
  28.             v = inflater.inflate(R.layout.ime_switcher, parent, false);
  29.         } else if (button.startsWith(KEY)) {
  30.             String uri = extractImage(button);
  31.             int code = extractKeycode(button);
  32.             v = inflater.inflate(R.layout.custom_key, parent, false);
  33.             ((KeyButtonView) v).setCode(code);
  34.             if (uri != null) {
  35.                 if (uri.contains(":")) {
  36.                     ((KeyButtonView) v).loadAsync(Icon.createWithContentUri(uri));
  37.                 } else if (uri.contains("/")) {
  38.                     int index = uri.indexOf('/');
  39.                     String pkg = uri.substring(0, index);
  40.                     int id = Integer.parseInt(uri.substring(index + 1));
  41.                     ((KeyButtonView) v).loadAsync(Icon.createWithResource(pkg, id));
  42.                 }
  43.             }
  44.         }
  45.         return v;
  46.     }

7.SystemUI\res\layout\home.xml

  1. <com.android.systemui.statusbar.policy.KeyButtonView
  2.     xmlns:android="http://schemas.android.com/apk/res/android"
  3.     xmlns:systemui="http://schemas.android.com/apk/res-auto"
  4.     android:id="@+id/home"
  5.     android:layout_width="@dimen/navigation_key_width"
  6.     android:layout_height="match_parent"
  7.     android:layout_weight="0"
  8.     systemui:keyCode="3"
  9.     android:scaleType="center"
  10.     android:contentDescription="@string/accessibility_home"
  11.     android:paddingStart="@dimen/navigation_key_padding"
  12.     android:paddingEnd="@dimen/navigation_key_padding"
  13.     />

8.SystemUI\src\com\android\systemui\statusbar\policy\KeyButtonView.java

先来看KeyButtonView的构造方法：我们之前xml的systemui:keyCode="3"方法在这里获取。再来看Touch事件，通过sendEvent()方法可以看出，back等view的点击touch事件不是自己处理的，而是交由系统以实体按键（keycode）的形式处理的。

当然KeyButtonView类还处理了支持长按的button,按键的响声等。

  1. @VisibleForTesting
  2.     public KeyButtonView(Context context, AttributeSet attrs, int defStyle, InputManager manager,
  3.             UiEventLogger uiEventLogger) {
  4.         super(context, attrs);
  5.         mUiEventLogger = uiEventLogger;
  6.  
  7.         TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.KeyButtonView,
  8.                 defStyle, 0);
  9.  
  10.         mCode = a.getInteger(R.styleable.KeyButtonView_keyCode, KEYCODE_UNKNOWN);
  11.  
  12.         mPlaySounds = a.getBoolean(R.styleable.KeyButtonView_playSound, true);
  13.  
  14.         TypedValue value = new TypedValue();
  15.         if (a.getValue(R.styleable.KeyButtonView_android_contentDescription, value)) {
  16.             mContentDescriptionRes = value.resourceId;
  17.         }
  18.  
  19.         a.recycle();
  20.  
  21.         setClickable(true);
  22.         mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
  23.  
  24.         mRipple = new KeyButtonRipple(context, this);
  25.         mOverviewProxyService = Dependency.get(OverviewProxyService.class);
  26.         mInputManager = manager;
  27.         setBackground(mRipple);
  28.         setWillNotDraw(false);
  29.         forceHasOverlappingRendering(false);
  30.     }
  31.  
  32.  
  33.  
  1.  @Override
  2.     public boolean onTouchEvent(MotionEvent ev) {
  3.         final boolean showSwipeUI = mOverviewProxyService.shouldShowSwipeUpUI();
  4.         final int action = ev.getAction();
  5.         int x, y;
  6.         if (action == MotionEvent.ACTION_DOWN) {
  7.             mGestureAborted = false;
  8.         }
  9.         if (mGestureAborted) {
  10.             setPressed(false);
  11.             return false;
  12.         }
  13.  
  14.         switch (action) {
  15.             case MotionEvent.ACTION_DOWN:
  16.                 mDownTime = SystemClock.uptimeMillis();
  17.                 mLongClicked = false;
  18.                 setPressed(true);
  19.  
  20.                 // Use raw X and Y to detect gestures in case a parent changes the x and y values
  21.                 mTouchDownX = (int) ev.getRawX();
  22.                 mTouchDownY = (int) ev.getRawY();
  23.                 if (mCode != KEYCODE_UNKNOWN) {
  24.                     sendEvent(KeyEvent.ACTION_DOWN, 0, mDownTime);
  25.                 } else {
  26.                     // Provide the same haptic feedback that the system offers for virtual keys.
  27.                     performHapticFeedback(HapticFeedbackConstants.VIRTUAL_KEY);
  28.                 }
  29.                 if (!showSwipeUI) {
  30.                     playSoundEffect(SoundEffectConstants.CLICK);
  31.                 }
  32.                 removeCallbacks(mCheckLongPress);
  33.                 postDelayed(mCheckLongPress, ViewConfiguration.getLongPressTimeout());
  34.                 break;
  35.             case MotionEvent.ACTION_MOVE:
  36.                 x = (int)ev.getRawX();
  37.                 y = (int)ev.getRawY();
  38.  
  39.                 float slop = QuickStepContract.getQuickStepTouchSlopPx(getContext());
  40.                 if (Math.abs(x - mTouchDownX) > slop || Math.abs(y - mTouchDownY) > slop) {
  41.                     // When quick step is enabled, prevent animating the ripple triggered by
  42.                     // setPressed and decide to run it on touch up
  43.                     setPressed(false);
  44.                     removeCallbacks(mCheckLongPress);
  45.                 }
  46.                 break;
  47.             case MotionEvent.ACTION_CANCEL:
  48.                 setPressed(false);
  49.                 if (mCode != KEYCODE_UNKNOWN) {
  50.                     sendEvent(KeyEvent.ACTION_UP, KeyEvent.FLAG_CANCELED);
  51.                 }
  52.                 removeCallbacks(mCheckLongPress);
  53.                 break;
  54.             case MotionEvent.ACTION_UP:
  55.                 final boolean doIt = isPressed() && !mLongClicked;
  56.                 setPressed(false);
  57.                 final boolean doHapticFeedback = (SystemClock.uptimeMillis() - mDownTime) > 150;
  58.                 if (showSwipeUI) {
  59.                     if (doIt) {
  60.                         // Apply haptic feedback on touch up since there is none on touch down
  61.                         performHapticFeedback(HapticFeedbackConstants.VIRTUAL_KEY);
  62.                         playSoundEffect(SoundEffectConstants.CLICK);
  63.                     }
  64.                 } else if (doHapticFeedback && !mLongClicked) {
  65.                     // Always send a release ourselves because it doesn't seem to be sent elsewhere
  66.                     // and it feels weird to sometimes get a release haptic and other times not.
  67.                     performHapticFeedback(HapticFeedbackConstants.VIRTUAL_KEY_RELEASE);
  68.                 }
  69.                 if (mCode != KEYCODE_UNKNOWN) {
  70.                     if (doIt) {
  71.                         sendEvent(KeyEvent.ACTION_UP, 0);
  72.                         sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED);
  73.                     } else {
  74.                         sendEvent(KeyEvent.ACTION_UP, KeyEvent.FLAG_CANCELED);
  75.                     }
  76.                 } else {
  77.                     // no key code, just a regular ImageView
  78.                     if (doIt && mOnClickListener != null) {
  79.                         mOnClickListener.onClick(this);
  80.                         sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED);
  81.                     }
  82.                 }
  83.                 removeCallbacks(mCheckLongPress);
  84.                 break;
  85.         }
  86.  
  87.         return true;
  88.     }
  1.  private void sendEvent(int action, int flags, long when) {
  2.         mMetricsLogger.write(new LogMaker(MetricsEvent.ACTION_NAV_BUTTON_EVENT)
  3.                 .setType(MetricsEvent.TYPE_ACTION)
  4.                 .setSubtype(mCode)
  5.                 .addTaggedData(MetricsEvent.FIELD_NAV_ACTION, action)
  6.                 .addTaggedData(MetricsEvent.FIELD_FLAGS, flags));
  7.         logSomePresses(action, flags);
  8.         if (mCode == KeyEvent.KEYCODE_BACK && flags != KeyEvent.FLAG_LONG_PRESS) {
  9.             Log.i(TAG, "Back button event: " + KeyEvent.actionToString(action));
  10.             if (action == MotionEvent.ACTION_UP) {
  11.                 mOverviewProxyService.notifyBackAction((flags & KeyEvent.FLAG_CANCELED) == 0,
  12.                         -1, -1, true /* isButton */, false /* gestureSwipeLeft */);
  13.             }
  14.         }
  15.         final int repeatCount = (flags & KeyEvent.FLAG_LONG_PRESS) != 0 ? 1 : 0;
  16.         final KeyEvent ev = new KeyEvent(mDownTime, when, action, mCode, repeatCount,
  17.                 0, KeyCharacterMap.VIRTUAL_KEYBOARD, 0,
  18.                 flags | KeyEvent.FLAG_FROM_SYSTEM | KeyEvent.FLAG_VIRTUAL_HARD_KEY,
  19.                 InputDevice.SOURCE_KEYBOARD);
  20.  
  21.         int displayId = INVALID_DISPLAY;
  22.  
  23.         // Make KeyEvent work on multi-display environment
  24.         if (getDisplay() != null) {
  25.             displayId = getDisplay().getDisplayId();
  26.         }
  27.         // Bubble controller will give us a valid display id if it should get the back event
  28.         BubbleController bubbleController = Dependency.get(BubbleController.class);
  29.         int bubbleDisplayId = bubbleController.getExpandedDisplayId(mContext);
  30.         if (mCode == KeyEvent.KEYCODE_BACK && bubbleDisplayId != INVALID_DISPLAY) {
  31.             displayId = bubbleDisplayId;
  32.         }
  33.         if (displayId != INVALID_DISPLAY) {
  34.             ev.setDisplayId(displayId);
  35.         }
  36.         mInputManager.injectInputEvent(ev, InputManager.INJECT_INPUT_EVENT_MODE_ASYNC);
  37.     }

9.那么我们现在布局文件都添加完成了，但是你会发现在NavigationBarInflaterView没有对资源文件添加的代码已经控件点击触摸事件处理逻辑。那么这两部分代码在哪里呢？

答案是：

1.NavigationBarView 完成资源文件添加。

2.NavigationBarFragment  添加点击事件和触摸事件的处理逻辑。

9.1.SystemUI\src\com\android\systemui\statusbar\phone\NavigationBarView.java

进入NavigationBarView类里，找到构造方法。

  1. public NavigationBarView(Context context, AttributeSet attrs) {
  2.         super(context, attrs);
  3.  
  4.        ...
  5.         ....
  6. 		
  7. 		//mButtonDispatchers 是维护这些home back recent图标view的管理类，会传递到他的child,NavigationBarInflaterView类中
  8.         mButtonDispatchers.put(R.id.back, new ButtonDispatcher(R.id.back));
  9.         mButtonDispatchers.put(R.id.home, new ButtonDispatcher(R.id.home));
  10. 		mButtonDispatchers.put(R.id.screenshot, new ButtonDispatcher(R.id.screenshot));	 
  11.         mButtonDispatchers.put(R.id.home_handle, new ButtonDispatcher(R.id.home_handle));
  12.         mButtonDispatchers.put(R.id.recent_apps, new ButtonDispatcher(R.id.recent_apps));
  13.         mButtonDispatchers.put(R.id.ime_switcher, imeSwitcherButton);
  14.         mButtonDispatchers.put(R.id.accessibility_button, accessibilityButton);
  15.         mButtonDispatchers.put(R.id.rotate_suggestion, rotateSuggestionButton);
  16.         mButtonDispatchers.put(R.id.menu_container, mContextualButtonGroup);
  17.         mDeadZone = new DeadZone(this);
  18.  
  19.         ......
  20.                         
  21.     }
  1.   @Override
  2.     public void onFinishInflate() {
  3.         super.onFinishInflate();
  4.         mNavigationInflaterView = findViewById(R.id.navigation_inflater);
  5.         mNavigationInflaterView.setButtonDispatchers(mButtonDispatchers);
  6.  
  7.         getImeSwitchButton().setOnClickListener(mImeSwitcherClickListener);
  8.  
  9.         Divider divider = Dependency.get(Divider.class);
  10.         divider.registerInSplitScreenListener(mDockedListener);
  11.         updateOrientationViews();
  12.         reloadNavIcons(); //加载图片
  13.     }
  1.  private void updateIcons(Configuration oldConfig) {
  2.         final boolean orientationChange = oldConfig.orientation != mConfiguration.orientation;
  3.         final boolean densityChange = oldConfig.densityDpi != mConfiguration.densityDpi;
  4.         final boolean dirChange = oldConfig.getLayoutDirection() != mConfiguration.getLayoutDirection();
  5.  
  6.         if (orientationChange || densityChange) {
  7.             mDockedIcon = getDrawable(R.drawable.ic_sysbar_docked);
  8.             mHomeDefaultIcon = getHomeDrawable();
  9.         }
  10.         if (densityChange || dirChange) {
  11.             mRecentIcon = getDrawable(R.drawable.ic_sysbar_recent);
  12. 			mScreenshot = getDrawable(R.drawable.ic_sysbar_shotscreen); 
  13.             mContextualButtonGroup.updateIcons();
  14.         }
  15.         if (orientationChange || densityChange || dirChange) {
  16.             mBackIcon = getBackDrawable();
  17.         }
  18.     }

9.2.SystemUI\src\com\android\systemui\statusbar\phone\NavigationBarFragment.java

  1.  @Override
  2.     public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
  3.         super.onViewCreated(view, savedInstanceState);
  4.         mNavigationBarView = (NavigationBarView) view;
  5.         final Display display = view.getDisplay();
  6.         // It may not have display when running unit test.
  7.         if (display != null) {
  8.             mDisplayId = display.getDisplayId();
  9.             mIsOnDefaultDisplay = mDisplayId == Display.DEFAULT_DISPLAY;
  10.         }
  11.  
  12.         mNavigationBarView.setComponents(mStatusBarLazy.get().getPanelController());
  13.         mNavigationBarView.setDisabledFlags(mDisabledFlags1);
  14.         mNavigationBarView.setOnVerticalChangedListener(this::onVerticalChanged);
  15.         mNavigationBarView.setOnTouchListener(this::onNavigationTouch);
  16.         if (savedInstanceState != null) {
  17.             mNavigationBarView.getLightTransitionsController().restoreState(savedInstanceState);
  18.         }
  19.         mNavigationBarView.setNavigationIconHints(mNavigationIconHints);
  20.         mNavigationBarView.setWindowVisible(isNavBarWindowVisible());
  21.  
  22.         prepareNavigationBarView();  //事件处理
  23.         checkNavBarModes();
  1. private void prepareNavigationBarView() {
  2.         mNavigationBarView.reorient();
  3.  
  4.         ButtonDispatcher recentsButton = mNavigationBarView.getRecentsButton();
  5.         recentsButton.setOnClickListener(this::onRecentsClick);
  6.         recentsButton.setOnTouchListener(this::onRecentsTouch);
  7.         recentsButton.setLongClickable(true);
  8.         recentsButton.setOnLongClickListener(this::onLongPressBackRecents);
  9.  
  10.         ButtonDispatcher backButton = mNavigationBarView.getBackButton();
  11.         backButton.setLongClickable(true);
  12.  
  13.         ButtonDispatcher homeButton = mNavigationBarView.getHomeButton();
  14.         homeButton.setOnTouchListener(this::onHomeTouch);
  15.         homeButton.setOnLongClickListener(this::onHomeLongClick);
  16.  
  17.         ButtonDispatcher accessibilityButton = mNavigationBarView.getAccessibilityButton();
  18.         accessibilityButton.setOnClickListener(this::onAccessibilityClick);
  19.         accessibilityButton.setOnLongClickListener(this::onAccessibilityLongClick);
  20.         updateAccessibilityServicesState(mAccessibilityManager);
  21.  
  22.         updateScreenPinningGestures();
  23.     }

至此，SystemUI的虚拟导航栏模块代码流程结束。

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