写在前面： SystemUI 是Android原生系统极重要的系统APP，本文介绍如何根据需要在原生三个按键BACK HOME RECENT的基础上，新增新的自定义按键。SystemUI总共分为三个版本：Phone手机、Tablet平板、TV版本。Android13中，Phone、Tablet是一样的。本教程适用SystemUI版本：Android13——>Phone 、Tablet版SystemUI。 注：SystemUI的启动流程，本篇文章不介绍。
一、底部导航栏新增功能按键。
首先介绍一下Phone、Tablet版的SystemUI的启动路线，看下图： 启动流程中的CentralSurfaces，是我们修改的切入点。打开源码找到CentralSurfacesImpl.java文件，下面我沿着CentralSurfacesImpl.java简单描述一下修改思路，然后贴出完整补丁。
1、frameworks\base\packages\SystemUI\src\com\android\systemui\statusbar\phone\CentralSurfacesImpl.java
@Override
public void start() {
. . . . . .
. . . . . .
. . . . . .
createAndAddWindows(result);//这里为入口
. . . . . .
. . . . . .
. . . . . .
}
@Override
public void createAndAddWindows(@Nullable RegisterStatusBarResult result) {
makeStatusBarView(result);//从这里进去创建状态栏、导航栏
mNotificationShadeWindowController.attach();
mStatusBarWindowController.attach();
}
// ================================================================================
// Constructing the view
// ================================================================================
protected void makeStatusBarView(@Nullable RegisterStatusBarResult result) {
. . . . . .
. . . . . .
. . . . . .
createNavigationBar(result);//创建导航栏入口
. . . . . .
. . . . . .
. . . . . .
}
protected void createNavigationBar(@Nullable RegisterStatusBarResult result) {
mNavigationBarController.createNavigationBars(true /* includeDefaultDisplay */, result);
}
2、frameworks\base\packages\SystemUI\src\com\android\systemui\navigationbar\NavigationBarController.java
public void createNavigationBars(final boolean includeDefaultDisplay,
RegisterStatusBarResult result) {
updateAccessibilityButtonModeIfNeeded();
// Don't need to create nav bar on the default display if we initialize TaskBar.
final boolean shouldCreateDefaultNavbar = includeDefaultDisplay
&& !initializeTaskbarIfNecessary();
Display[] displays = mDisplayManager.getDisplays();
for (Display display : displays) {
if (shouldCreateDefaultNavbar || display.getDisplayId() != DEFAULT_DISPLAY) {
createNavigationBar(display, null /* savedState */, result);
}
}
}
/**
* Adds a navigation bar on default display or an external display if the display supports
* system decorations.
*
* @param display the display to add navigation bar on.
*/
@VisibleForTesting
void createNavigationBar(Display display, Bundle savedState, RegisterStatusBarResult result) {
. . . . . .
. . . . . .
. . . . . .
//从这里分为两个部分
NavigationBar navBar = component.getNavigationBar();//导航栏实例化
navBar.init();//将导航栏添加到屏幕上
. . . . . .
. . . . . .
. . . . . .
}
注：导航栏实例化会去加载导航栏对应的XML，里面默认只有Back|Home|Recent，想要添加新的功能键，第一步就是去修改这个XML；navBar.init()中则是为按键添加图标、绑定点击事件，并最终通过windowManager的addView方法将导航添加到桌面上显示。
完整补丁：
1、xml中新增按钮
以我的项目分辨率 = 1920x1080、dpi = 320、density = 2来说，对应修改的xml为——>res\values-sw372dp\config.xml 我这里给出的例子，除了原生Back|Home|Recent之外，新增了其它四个按键。
diff --git a/frameworks/base/packages/SystemUI/res/values-sw372dp/config.xml b/frameworks/base/packages/SystemUI/res/values-sw372dp/config.xml
index 07b797a324..3b936766c5 100644
--- a/frameworks/base/packages/SystemUI/res/values-sw372dp/config.xml
+++ b/frameworks/base/packages/SystemUI/res/values-sw372dp/config.xml
@@ -21,5 +21,5 @@
for different hardware and product builds. -->
-
+
2、NavigationBarInflaterView.java
inflateLayout函数新增inflateButtons选项、createView函数新增对新按钮描述String的过滤；这个类的功能主要是从上述的xml文件中把所有按键加载进来，并进行过滤操作。
diff --git a/frameworks/base/packages/SystemUI/src/com/android/systemui/navigationbar/NavigationBarInflaterView.java b/frameworks/base/packages/SystemUI/src/com/android/systemui/navigationbar/NavigationBarInflaterView.java
index 59bb2278ed..5724e09a00 100644
--- a/frameworks/base/packages/SystemUI/src/com/android/systemui/navigationbar/NavigationBarInflaterView.java
+++ b/frameworks/base/packages/SystemUI/src/com/android/systemui/navigationbar/NavigationBarInflaterView.java
@@ -60,6 +60,12 @@ public class NavigationBarInflaterView extends FrameLayout
public static final String BACK = "back";
public static final String HOME = "home";
public static final String RECENT = "recent";
+ //xuhao add
+ public static final String VOLUME = "volume";
+ public static final String COMMENTS = "comments";
+ public static final String WHITEBOARD = "whiteboard";
+ public static final String COLLAPSE = "collapse";
+ //
public static final String NAVSPACE = "space";
public static final String CLIPBOARD = "clipboard";
public static final String HOME_HANDLE = "home_handle";
@@ -96,7 +102,7 @@ public class NavigationBarInflaterView extends FrameLayout
private View mLastPortrait;
private View mLastLandscape;
- private boolean mIsVertical;
+ private boolean mIsVertical ;
private boolean mAlternativeOrder;
private OverviewProxyService mOverviewProxyService;
@@ -177,6 +183,7 @@ public class NavigationBarInflaterView extends FrameLayout
void updateButtonDispatchersCurrentView() {
if (mButtonDispatchers != null) {
View view = mIsVertical ? mVertical : mHorizontal;
+ Log.d(TAG,"mIsVertical"+mIsVertical);
for (int i = 0; i < mButtonDispatchers.size(); i++) {
final ButtonDispatcher dispatcher = mButtonDispatchers.valueAt(i);
dispatcher.setCurrentView(view);
@@ -236,34 +243,64 @@ public class NavigationBarInflaterView extends FrameLayout
if (newLayout == null) {
newLayout = getDefaultLayout();
}
- String[] sets = newLayout.split(GRAVITY_SEPARATOR, 3);
- if (sets.length != 3) {
+
+ //xuhao add
+ String[] sets = newLayout.split(GRAVITY_SEPARATOR, 7);
+ if (sets.length != 7) {
Log.d(TAG, "Invalid layout.");
newLayout =
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