目录
2.SystemUI 导航栏虚拟按键icon大小改变的核心类
3.SystemUI 导航栏虚拟按键icon大小改变的核心功能分析和实现
1.概述
在11.0的系统产品开发中，对应SystemUI的NavigationBar导航栏的定制化开发也是比较常见的功能，由于产品的小屏幕的，所以对于屏幕导航栏的三个虚拟按键需要做定制，产品需求要求对导航栏虚拟按键的宽高做调整，放大虚拟按键宽高，所以需要查看关键源码然后修改就好了
2.SystemUI 导航栏虚拟按键icon大小改变的核心类
frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarFragment.java
frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarView.java3.SystemUI 导航栏虚拟按键icon大小改变的核心功能分析和实现
3.1关于加载导航栏的相关代码分析
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.navigation_bar, container, false);
}
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
mNavigationBarView = (NavigationBarView) view;
final Display display = view.getDisplay();
// It may not have display when running unit test.
if (display != null) {
mDisplayId = display.getDisplayId();
mIsOnDefaultDisplay = mDisplayId == Display.DEFAULT_DISPLAY;
}
mNavigationBarView.setComponents(mStatusBarLazy.get().getPanelController());
mNavigationBarView.setDisabledFlags(mDisabledFlags1);
mNavigationBarView.setOnVerticalChangedListener(this::onVerticalChanged);
mNavigationBarView.setOnTouchListener(this::onNavigationTouch);
if (savedInstanceState != null) {
mNavigationBarView.getLightTransitionsController().restoreState(savedInstanceState);
}
mNavigationBarView.setNavigationIconHints(mNavigationIconHints);
mNavigationBarView.setWindowVisible(isNavBarWindowVisible());
prepareNavigationBarView();
checkNavBarModes();
IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_OFF);
filter.addAction(Intent.ACTION_SCREEN_ON);
filter.addAction(Intent.ACTION_USER_SWITCHED);
mBroadcastDispatcher.registerReceiverWithHandler(mBroadcastReceiver, filter,
Handler.getMain(), UserHandle.ALL);
notifyNavigationBarScreenOn();
mOverviewProxyService.addCallback(mOverviewProxyListener);
updateSystemUiStateFlags(-1);
// Currently there is no accelerometer sensor on non-default display.
if (mIsOnDefaultDisplay) {
final RotationButtonController rotationButtonController =
mNavigationBarView.getRotationButtonController();
rotationButtonController.addRotationCallback(mRotationWatcher);
// Reset user rotation pref to match that of the WindowManager if starting in locked
// mode. This will automatically happen when switching from auto-rotate to locked mode.
if (display != null && rotationButtonController.isRotationLocked()) {
rotationButtonController.setRotationLockedAtAngle(display.getRotation());
}
} else {
mDisabledFlags2 |= StatusBarManager.DISABLE2_ROTATE_SUGGESTIONS;
}
setDisabled2Flags(mDisabledFlags2);
if (mIsOnDefaultDisplay) {
mAssistHandlerViewController =
new AssistHandleViewController(mHandler, mNavigationBarView);
getBarTransitions().addDarkIntensityListener(mAssistHandlerViewController);
}
initSecondaryHomeHandleForRotation();
} 在上述代码中onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
Bundle savedInstanceState)中加载代码布局代码就是navigation_bar.xml布局文件
而在onViewCreated(View view, @Nullable Bundle savedInstanceState) 中，也是设置mNavigationBarView
的相关参数，所以需要具体看NavigationBarView的相关源码
private void prepareNavigationBarView() {
mNavigationBarView.reorient();
ButtonDispatcher recentsButton = mNavigationBarView.getRecentsButton();
recentsButton.setOnClickListener(this::onRecentsClick);
recentsButton.setOnTouchListener(this::onRecentsTouch);
recentsButton.setLongClickable(true);
recentsButton.setOnLongClickListener(this::onLongPressBackRecents);
ButtonDispatcher backButton = mNavigationBarView.getBackButton();
backButton.setLongClickable(true);
ButtonDispatcher homeButton = mNavigationBarView.getHomeButton();
homeButton.setOnTouchListener(this::onHomeTouch);
homeButton.setOnLongClickListener(this::onHomeLongClick);
ButtonDispatcher accessibilityButton = mNavigationBarView.getAccessibilityButton();
accessibilityButton.setOnClickListener(this::onAccessibilityClick);
accessibilityButton.setOnLongClickListener(this::onAccessibilityLongClick);
updateAccessibilityServicesState(mAccessibilityManager);
updateScreenPinningGestures();
}在NavigationBarFragment.java中的prepareNavigationBarView() 源码中可以看到，backButton recentsButton homeButton 等到导航栏三大键都是调用
NavigationBarView的对应方法的，所以具体的icon设置都是在NavigationBarView中定义的，所以需要看NavigationBarView的相关源码
3.2NavigationBarView的相关源码分析
public ButtonDispatcher getRecentsButton() {
return mButtonDispatchers.get(R.id.recent_apps);
}
public ButtonDispatcher getBackButton() {
return mButtonDispatchers.get(R.id.back);
}
public ButtonDispatcher getHomeButton() {
return mButtonDispatchers.get(R.id.home);
}在NavigationBarFragment.java中通过上面三个方法调用导航栏的虚拟按键，然后操作这三个键，来实现对他们的点击事件的处理
@Override
public void setLayoutDirection(int layoutDirection) {
reloadNavIcons();
super.setLayoutDirection(layoutDirection);
}
private void reloadNavIcons() {
updateIcons(Configuration.EMPTY);
}
private void updateIcons(Configuration oldConfig) {
final boolean orientationChange = oldConfig.orientation != mConfiguration.orientation;
final boolean densityChange = oldConfig.densityDpi != mConfiguration.densityDpi;
final boolean dirChange = oldConfig.getLayoutDirection() != mConfiguration.getLayoutDirection();
if (orientationChange || densityChange) {
mDockedIcon = getDrawable(R.drawable.ic_sysbar_docked);
mHomeDefaultIcon = getHomeDrawable();
}
if (densityChange || dirChange) {
mRecentIcon = getDrawable(R.drawable.ic_sysbar_recent);
mContextualButtonGroup.updateIcons();
}
if (orientationChange || densityChange || dirChange) {
mBackIcon = getBackDrawable();
}
} 在NavigationBarView的布局是在setLayoutDirection(int layoutDirection)调用reloadNavIcons()，最终调用updateIcons(Configuration oldConfig) 中来加载导航栏的
从上述代码可以发现，home键的图标是getHomeDrawable()而recents键图标就是getDrawable(R.drawable.ic_sysbar_recent)，而back键就是 getBackDrawable()
public KeyButtonDrawable getBackDrawable() {
KeyButtonDrawable drawable = getDrawable(getBackDrawableRes());
orientBackButton(drawable);
return drawable;
}
public @DrawableRes int getBackDrawableRes() {
return chooseNavigationIconDrawableRes(R.drawable.ic_sysbar_back,
R.drawable.ic_sysbar_back_quick_step);
}
public KeyButtonDrawable getHomeDrawable() {
final boolean quickStepEnabled = mOverviewProxyService.shouldShowSwipeUpUI();
KeyButtonDrawable drawable = quickStepEnabled
? getDrawable(R.drawable.ic_sysbar_home_quick_step)
: getDrawable(R.drawable.ic_sysbar_home);
orientHomeButton(drawable);
return drawable;
}通过上述分析，所以back键就是ic_sysbar_back.xml布局，而home键就是ic_sysbar_home布局 recent键就是ic_sysbar_recent布局
接下来看下res/drawable下的icon的xml布局
例如ic_sysbar_back.xml布局如下：
<vector xmlns:android="http://schemas.android.com/apk/res/android"
android:width="28dp"
android:height="28dp"
android:autoMirrored="true"
android:viewportWidth="28"
android:viewportHeight="28">
<path
android:fillColor="?attr/singleToneColor"
android:pathData="M6.49,14.86c-0.66-0.39-0.66-1.34,0-1.73l6.02-3.53l5.89-3.46C19.11,5.73,20,6.26,20,7.1V14v6.9 c0,0.84-0.89,1.37-1.6,0.95l-5.89-3.46L6.49,14.86z" />
</vector>只需要修改width和height属性值就可以了
修改为:
<vector xmlns:android="http://schemas.android.com/apk/res/android"
android:width="42dp"
android:height="42dp"
android:autoMirrored="true"
android:viewportWidth="42"
android:viewportHeight="42">
<path
android:fillColor="?attr/singleToneColor"
android:pathData="M6.49,14.86c-0.66-0.39-0.66-1.34,0-1.73l6.02-3.53l5.89-3.46C19.11,5.73,20,6.26,20,7.1V14v6.9 c0,0.84-0.89,1.37-1.6,0.95l-5.89-3.46L6.49,14.86z" />
</vector>其他的home键和recent键按照这种方式修改就好了 就可以完成功能了