一、背景
在Android系统中，SystemUI负责管理系统的状态栏、导航栏等用户界面元素。若要在SystemUI中默认去掉底部导航栏，
可以通过以下几种方法实现：
1. 修改布局文件
在Android的SystemUI源代码中，底部导航栏的布局文件通常位于com.android.systemui.statusbar.phone包中，文件名可能为NavigationBarView.xml或其他与导航栏相关的布局文件。通过修改这些布局文件，可以隐藏底部导航栏。具体步骤包括：
-
使用Android Studio或其他IDE打开SystemUI项目。
-
导入Android的SystemUI源代码。
-
导航到与导航栏布局相关的文件。
-
修改布局文件中的代码以隐藏底部导航栏，例如通过设置
visibility属性为GONE或INVISIBLEframeworks\base\core\res\res\values\demins.xml
2. 编程方式隐藏
在SystemUI的Java代码中，可以通过编程方式控制底部导航栏的显示与隐藏。这通常涉及到对NavigationBarController或类似控制器的操作。例如，可以通过调用setSystemUiVisibility方法并传入适当的标志来隐藏导航栏，如View.SYSTEM_UI_FLAG_HIDE_NAVIGATION。但请注意，这种方法可能需要在应用层面而非系统层面实现，因为直接修改SystemUI的代码通常需要对Android系统进行深度定制。
frameworks\base\services\core\java\com\android\server\wm\DisplayPolicy.java
3. 使用手势导航
主要核心代码:
framework/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBar.java
二、改变状态栏或者其他系统UI的可见性
setSystemUiVisibility(int visibility)：通过setSystemUiVisibility(int visibility)方法，可以改变状态栏或者其他系统UI的可见性。getWindow().getDecorView().setSystemUiVisibility(int visibility);
可供选择的参数：
View.SYSTEM_UI_FLAG_VISIBLE（默认模式，显示状态栏和导航栏）
View.SYSTEM_UI_FLAG_LOW_PROFILE（低调模式，隐藏不重要的状态栏图标，导航栏中相应的图标都变成了一个小点。点击状态栏或导航栏还原成正常的状态）
SYSTEM_UI_FLAG_HIDE_NAVIGATION（隐藏导航栏，点击屏幕任意区域，导航栏将重新出现，并且不会自动消失
SYSTEM_UI_FLAG_FULLSCREEN（隐藏状态栏，点击屏幕区域不会出现，需要从状态栏位置下拉才会出现）
SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
三、三种方法去去掉底部导航栏
1、StatusBar中实现默认去掉底部导航栏
@Override
public void start() {
mGroupManager = Dependency.get(NotificationGroupManager.class);
mGroupAlertTransferHelper = Dependency.get(NotificationGroupAlertTransferHelper.class);
mVisualStabilityManager = Dependency.get(VisualStabilityManager.class);
mNotificationLogger = Dependency.get(NotificationLogger.class);
mRemoteInputManager = Dependency.get(NotificationRemoteInputManager.class);
mNotificationListener = Dependency.get(NotificationListener.class);
mNotificationListener.registerAsSystemService();
mNetworkController = Dependency.get(NetworkController.class);
mUserSwitcherController = Dependency.get(UserSwitcherController.class);
mScreenLifecycle = Dependency.get(ScreenLifecycle.class);
mScreenLifecycle.addObserver(mScreenObserver);
mWakefulnessLifecycle = Dependency.get(WakefulnessLifecycle.class);
mWakefulnessLifecycle.addObserver(mWakefulnessObserver);
mBatteryController = Dependency.get(BatteryController.class);
mDataSaverController = Dependency.get(DataSaverController.class);
mAssistManager = Dependency.get(AssistManager.class);
mUiModeManager = mContext.getSystemService(UiModeManager.class);
mLockscreenUserManager = Dependency.get(NotificationLockscreenUserManager.class);
mGutsManager = Dependency.get(NotificationGutsManager.class);
mMediaManager = Dependency.get(NotificationMediaManager.class);
mEntryManager = Dependency.get(NotificationEntryManager.class);
mNotificationInterruptionStateProvider =
Dependency.get(NotificationInterruptionStateProvider.class);
mViewHierarchyManager = Dependency.get(NotificationViewHierarchyManager.class);
mForegroundServiceController = Dependency.get(ForegroundServiceController.class);
mAppOpsController = Dependency.get(AppOpsController.class);
mZenController = Dependency.get(ZenModeController.class);
mKeyguardViewMediator = getComponent(KeyguardViewMediator.class);
mColorExtractor = Dependency.get(SysuiColorExtractor.class);
mDeviceProvisionedController = Dependency.get(DeviceProvisionedController.class);
mNavigationBarController = Dependency.get(NavigationBarController.class);
mBubbleController = Dependency.get(BubbleController.class);
mBubbleController.setExpandListener(mBubbleExpandListener);
mActivityIntentHelper = new ActivityIntentHelper(mContext);
KeyguardSliceProvider sliceProvider = KeyguardSliceProvider.getAttachedInstance();
if (sliceProvider != null) {
sliceProvider.initDependencies(mMediaManager, mStatusBarStateController);
} else {
Log.w(TAG, "Cannot init KeyguardSliceProvider dependencies");
}
mColorExtractor.addOnColorsChangedListener(this);
mStatusBarStateController.addCallback(this,
SysuiStatusBarStateController.RANK_STATUS_BAR);
mWindowManager = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);
mDreamManager = IDreamManager.Stub.asInterface(
ServiceManager.checkService(DreamService.DREAM_SERVICE));
/* UNISOC: Bug 1074234, 885650, Super power feature @{ */
if(SprdPowerManagerUtil.SUPPORT_SUPER_POWER_SAVE){
int mode = SprdPowerManagerUtil.getPowerSaveModeInternal();
mPowerSaveMode = mode;
curMode = mode;
}
/* @} */
mDisplay = mWindowManager.getDefaultDisplay();
mDisplayId = mDisplay.getDisplayId();
updateDisplaySize();
mVibrateOnOpening = mContext.getResources().getBoolean(
R.bool.config_vibrateOnIconAnimation);
mVibratorHelper = Dependency.get(VibratorHelper.class);
DateTimeView.setReceiverHandler(Dependency.get(Dependency.TIME_TICK_HANDLER));
putComponent(StatusBar.class, this);
// start old BaseStatusBar.start().
mWindowManagerService = WindowManagerGlobal.getWindowManagerService();
mDevicePolicyManager = (DevicePolicyManager) mContext.getSystemService(
Context.DEVICE_POLICY_SERVICE);
mAccessibilityManager = (AccessibilityManager)
mContext.getSystemService(Context.ACCESSIBILITY_SERVICE);
mPowerManager = (PowerManager) mContext.getSystemService(Context.POWER_SERVICE);
mKeyguardUpdateMonitor = KeyguardUpdateMonitor.getInstance(mContext);
mBarService = IStatusBarService.Stub.asInterface(
ServiceManager.getService(Context.STATUS_BAR_SERVICE));
mRecents = getComponent(Recents.class);
mKeyguardManager = (KeyguardManager) mContext.getSystemService(Context.KEYGUARD_SERVICE);
// Connect in to the status bar manager service
mCommandQueue = getComponent(CommandQueue.class);
mCommandQueue.addCallback(this);
RegisterStatusBarResult result = null;
try {
result = mBarService.registerStatusBar(mCommandQueue);
} catch (RemoteException ex) {
ex.rethrowFromSystemServer();
}
createAndAddWindows(result);
// Make sure we always have the most current wallpaper info.
IntentFilter wallpaperChangedFilter = new IntentFilter(Intent.ACTION_WALLPAPER_CHANGED);
mContext.registerReceiverAsUser(mWallpaperChangedReceiver, UserHandle.ALL,
wallpaperChangedFilter, null /* broadcastPermission */, null /* scheduler */);
mWallpaperChangedReceiver.onReceive(mContext, null);
// Set up the initial notification state. This needs to happen before CommandQueue.disable()
setUpPresenter();
setSystemUiVisibility(mDisplayId, result.mSystemUiVisibility,
result.mFullscreenStackSysUiVisibility, result.mDockedStackSysUiVisibility,
0xffffffff, result.mFullscreenStackBounds, result.mDockedStackBounds,
result.mNavbarColorManagedByIme);
// StatusBarManagerService has a back up of IME token and it's restored here.
setImeWindowStatus(mDisplayId, result.mImeToken, result.mImeWindowVis,
result.mImeBackDisposition, result.mShowImeSwitcher);
// Set up the initial icon state
int numIcons = result.mIcons.size();
for (int i = 0; i < numIcons; i++) {
mCommandQueue.setIcon(result.mIcons.keyAt(i), result.mIcons.valueAt(i));
}
if (DEBUG) {
Log.d(TAG, String.format(
"init: icons=%d disabled=0x%08x lights=0x%08x imeButton=0x%08x",
numIcons,
result.mDisabledFlags1,
result.mSystemUiVisibility,
result.mImeWindowVis));
}
IntentFilter internalFilter = new IntentFilter();
internalFilter.addAction(BANNER_ACTION_CANCEL);
internalFilter.addAction(BANNER_ACTION_SETUP);
mContext.registerReceiver(mBannerActionBroadcastReceiver, internalFilter, PERMISSION_SELF,
null);
IWallpaperManager wallpaperManager = IWallpaperManager.Stub.asInterface(
ServiceManager.getService(Context.WALLPAPER_SERVICE));
try {
wallpaperManager.setInAmbientMode(false /* ambientMode */, 0L /* duration */);
} catch (RemoteException e) {
// Just pass, nothing critical.
}
// end old BaseStatusBar.start().
// Lastly, call to the icon policy to install/update all the icons.
mIconPolicy = new PhoneStatusBarPolicy(mContext, mIconController);
mSignalPolicy = new StatusBarSignalPolicy(mContext, mIconController);
mUnlockMethodCache = UnlockMethodCache.getInstance(mContext);
mUnlockMethodCache.addListener(this);
startKeyguard();
mKeyguardUpdateMonitor.registerCallback(mUpdateCallback);
putComponent(DozeHost.class, mDozeServiceHost);
mScreenPinningRequest = new ScreenPinningRequest(mContext);
mFalsingManager = FalsingManagerFactory.getInstance(mContext);
Dependency.get(ActivityStarterDelegate.class).setActivityStarterImpl(this);
Dependency.get(ConfigurationController.class).addCallback(this);
// set the initial view visibility
Dependency.get(InitController.class).addPostInitTask(this::updateAreThereNotifications);
int disabledFlags1 = result.mDisabledFlags1;
int disabledFlags2 = result.mDisabledFlags2;
Dependency.get(InitController.class).addPostInitTask(
() -> setUpDisableFlags(disabledFlags1, disabledFlags2));
// UNISOC: BUG 1156257 add screen resolution observer to control NavigationBarView
mContext.getContentResolver().registerContentObserver(Settings.System.getUriFor(ACTION_SR_CHANGING),
false, mScreenResolutionObserver);
CommonUtils.setRegionOrLongshotMode(mContext.getContentResolver(), 0);
}
// ================================================================================
// Constructing the view
// ================================================================================
protected void makeStatusBarView(@Nullable RegisterStatusBarResult result) {
final Context context = mContext;
updateDisplaySize(); // populates mDisplayMetrics
updateResources();
updateTheme();
inflateStatusBarWindow(context);
mStatusBarWindow.setService(this);
mStatusBarWindow.setOnTouchListener(getStatusBarWindowTouchListener());
// TODO: Deal with the ugliness that comes from having some of the statusbar broken out
// into fragments, but the rest here, it leaves some awkward lifecycle and whatnot.
mNotificationPanel = mStatusBarWindow.findViewById(R.id.notification_panel);
mStackScroller = mStatusBarWindow.findViewById(R.id.notification_stack_scroller);
mZenController.addCallback(this);
NotificationListContainer notifListContainer = (NotificationListContainer) mStackScroller;
mNotificationLogger.setUpWithContainer(notifListContainer);
mNotificationIconAreaController = SystemUIFactory.getInstance()
.createNotificationIconAreaController(context, this, mStatusBarStateController);
inflateShelf();
mNotificationIconAreaController.setupShelf(mNotificationShelf);
Dependency.get(DarkIconDispatcher.class).addDarkReceiver(mNotificationIconAreaController);
// Allow plugins to reference DarkIconDispatcher and StatusBarStateController
Dependency.get(PluginDependencyProvider.class)
.allowPluginDependency(DarkIconDispatcher.class);
Dependency.get(PluginDependencyProvider.class)
.allowPluginDependency(StatusBarStateController.class);
FragmentHostManager.get(mStatusBarWindow)
.addTagListener(CollapsedStatusBarFragment.TAG, (tag, fragment) -> {
CollapsedStatusBarFragment statusBarFragment =
(CollapsedStatusBarFragment) fragment;
statusBarFragment.initNotificationIconArea(mNotificationIconAreaController);
PhoneStatusBarView oldStatusBarView = mStatusBarView;
mStatusBarView = (PhoneStatusBarView) fragment.getView();
mStatusBarView.setBar(this);
mStatusBarView.setPanel(mNotificationPanel);
mStatusBarView.setScrimController(mScrimController);
// CollapsedStatusBarFragment re-inflated PhoneStatusBarView and both of
// mStatusBarView.mExpanded and mStatusBarView.mBouncerShowing are false.
// PhoneStatusBarView's new instance will set to be gone in
// PanelBar.updateVisibility after calling mStatusBarView.setBouncerShowing
// that will trigger PanelBar.updateVisibility. If there is a heads up showing,
// it needs to notify PhoneStatusBarView's new instance to update the correct
// status by calling mNotificationPanel.notifyBarPanelExpansionChanged().
if (mHeadsUpManager.hasPinnedHeadsUp()) {
mNotificationPanel.notifyBarPanelExpansionChanged();
}
mStatusBarView.setBouncerShowing(mBouncerShowing);
if (oldStatusBarView != null) {
float fraction = oldStatusBarView.getExpansionFraction();
boolean expanded = oldStatusBarView.isExpanded();
mStatusBarView.panelExpansionChanged(fraction, expanded);
}
HeadsUpAppearanceController oldController = mHeadsUpAppearanceController;
if (mHeadsUpAppearanceController != null) {
// This view is being recreated, let's destroy the old one
mHeadsUpAppearanceController.destroy();
}
mHeadsUpAppearanceController = new HeadsUpAppearanceController(
mNotificationIconAreaController, mHeadsUpManager, mStatusBarWindow);
mHeadsUpAppearanceController.readFrom(oldController);
mStatusBarWindow.setStatusBarView(mStatusBarView);
updateAreThereNotifications();
checkBarModes();
}).getFragmentManager()
.beginTransaction()
.replace(R.id.status_bar_container, new CollapsedStatusBarFragment(),
CollapsedStatusBarFragment.TAG)
.commit();
mIconController = Dependency.get(StatusBarIconController.class);
mHeadsUpManager = new HeadsUpManagerPhone(context, mStatusBarWindow, mGroupManager, this,
mVisualStabilityManager);
Dependency.get(ConfigurationController.class).addCallback(mHeadsUpManager);
mHeadsUpManager.addListener(this);
mHeadsUpManager.addListener(mNotificationPanel);
mHeadsUpManager.addListener(mGroupManager);
mHeadsUpManager.addListener(mGroupAlertTransferHelper);
mHeadsUpManager.addListener(mVisualStabilityManager);
mAmbientPulseManager.addListener(this);
mAmbientPulseManager.addListener(mGroupManager);
mAmbientPulseManager.addListener(mGroupAlertTransferHelper);
mNotificationPanel.setHeadsUpManager(mHeadsUpManager);
mGroupManager.setHeadsUpManager(mHeadsUpManager);
mGroupAlertTransferHelper.setHeadsUpManager(mHeadsUpManager);
mNotificationLogger.setHeadsUpManager(mHeadsUpManager);
putComponent(HeadsUpManager.class, mHeadsUpManager);
createNavigationBar(result);
if (ENABLE_LOCKSCREEN_WALLPAPER) {
mLockscreenWallpaper = new LockscreenWallpaper(mContext, this, mHandler);
}
mKeyguardIndicationController =
SystemUIFactory.getInstance().createKeyguardIndicationController(mContext,
mStatusBarWindow.findViewById(R.id.keyguard_indication_area),
mStatusBarWindow.findViewById(R.id.lock_icon));
mNotificationPanel.setKeyguardIndicationController(mKeyguardIndicationController);
mAmbientIndicationContainer = mStatusBarWindow.findViewById(
R.id.ambient_indication_container);
// TODO: Find better place for this callback.
mBatteryController.addCallback(new BatteryStateChangeCallback() {
@Override
public void onPowerSaveChanged(boolean isPowerSave) {
mHandler.post(mCheckBarModes);
if (mDozeServiceHost != null) {
mDozeServiceHost.firePowerSaveChanged(isPowerSave);
}
}
@Override
public void onBatteryLevelChanged(int level, boolean pluggedIn, boolean charging) {
// noop
}
});
mAutoHideController = Dependency.get(AutoHideController.class);
mAutoHideController.setStatusBar(this);
mLightBarController = Dependency.get(LightBarController.class);
ScrimView scrimBehind = mStatusBarWindow.findViewById(R.id.scrim_behind);
ScrimView scrimInFront = mStatusBarWindow.findViewById(R.id.scrim_in_front);
mScrimController = SystemUIFactory.getInstance().createScrimController(
scrimBehind, scrimInFront, mLockscreenWallpaper,
(state, alpha, color) -> mLightBarController.setScrimState(state, alpha, color),
scrimsVisible -> {
if (mStatusBarWindowController != null) {
mStatusBarWindowController.setScrimsVisibility(scrimsVisible);
}
if (mStatusBarWindow != null) {
mStatusBarWindow.onScrimVisibilityChanged(scrimsVisible);
}
}, DozeParameters.getInstance(mContext),
mContext.getSystemService(AlarmManager.class));
mNotificationPanel.initDependencies(this, mGroupManager, mNotificationShelf,
mHeadsUpManager, mNotificationIconAreaController, mScrimController);
mDozeScrimController = new DozeScrimController(DozeParameters.getInstance(context));
BackDropView backdrop = mStatusBarWindow.findViewById(R.id.backdrop);
mMediaManager.setup(backdrop, backdrop.findViewById(R.id.backdrop_front),
backdrop.findViewById(R.id.backdrop_back), mScrimController, mLockscreenWallpaper);
// Other icons
mVolumeComponent = getComponent(VolumeComponent.class);
mNotificationPanel.setUserSetupComplete(mUserSetup);
if (UserManager.get(mContext).isUserSwitcherEnabled()) {
createUserSwitcher();
}
mNotificationPanel.setLaunchAffordanceListener(
mStatusBarWindow::onShowingLaunchAffordanceChanged);
// Set up the quick settings tile panel
View container = mStatusBarWindow.findViewById(R.id.qs_frame);
if (container != null) {
FragmentHostManager fragmentHostManager = FragmentHostManager.get(container);
ExtensionFragmentListener.attachExtensonToFragment(container, QS.TAG, R.id.qs_frame,
Dependency.get(ExtensionController.class)
.newExtension(QS.class)
.withPlugin(QS.class)
.withDefault(this::createDefaultQSFragment)
.build());
mBrightnessMirrorController = new BrightnessMirrorController(mStatusBarWindow,
(visible) -> {
mBrightnessMirrorVisible = visible;
updateScrimController();
});
fragmentHostManager.addTagListener(QS.TAG, (tag, f) -> {
QS qs = (QS) f;
if (qs instanceof QSFragment) {
mQSPanel = ((QSFragment) qs).getQsPanel();
mQSPanel.setBrightnessMirror(mBrightnessMirrorController);
mFooter = ((QSFragment) qs).getFooter();
}
});
}
mReportRejectedTouch = mStatusBarWindow.findViewById(R.id.report_rejected_touch);
if (mReportRejectedTouch != null) {
updateReportRejectedTouchVisibility();
mReportRejectedTouch.setOnClickListener(v -> {
Uri session = mFalsingManager.reportRejectedTouch();
if (session == null) { return; }
StringWriter message = new StringWriter();
message.write("Build info: ");
message.write(SystemProperties.get("ro.build.description"));
message.write("\nSerial number: ");
message.write(SystemProperties.get("ro.serialno"));
message.write("\n");
PrintWriter falsingPw = new PrintWriter(message);
FalsingLog.dump(falsingPw);
falsingPw.flush();
startActivityDismissingKeyguard(Intent.createChooser(new Intent(Intent.ACTION_SEND)
.setType("*/*")
.putExtra(Intent.EXTRA_SUBJECT, "Rejected touch report")
.putExtra(Intent.EXTRA_STREAM, session)
.putExtra(Intent.EXTRA_TEXT, message.toString()),
"Share rejected touch report")
.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK),
true /* onlyProvisioned */, true /* dismissShade */);
});
}
PowerManager pm = (PowerManager) mContext.getSystemService(Context.POWER_SERVICE);
if (!pm.isScreenOn()) {
mBroadcastReceiver.onReceive(mContext, new Intent(Intent.ACTION_SCREEN_OFF));
}
mGestureWakeLock = pm.newWakeLock(PowerManager.SCREEN_BRIGHT_WAKE_LOCK,
"GestureWakeLock");
mVibrator = mContext.getSystemService(Vibrator.class);
int[] pattern = mContext.getResources().getIntArray(
R.array.config_cameraLaunchGestureVibePattern);
mCameraLaunchGestureVibePattern = new long[pattern.length];
for (int i = 0; i < pattern.length; i++) {
mCameraLaunchGestureVibePattern[i] = pattern[i];
}
// receive broadcasts
IntentFilter filter = new IntentFilter();
filter.addAction(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
filter.addAction(Intent.ACTION_SCREEN_OFF);
filter.addAction(DevicePolicyManager.ACTION_SHOW_DEVICE_MONITORING_DIALOG);
/* UNISOC: Bug 1074234, 885650, Super power feature @{ */
if(SprdPowerManagerUtil.SUPPORT_SUPER_POWER_SAVE){
filter.addAction(SprdPowerManagerUtil.ACTION_POWEREX_SAVE_MODE_CHANGED);
}
/* @} */
context.registerReceiverAsUser(mBroadcastReceiver, UserHandle.ALL, filter, null, null);
IntentFilter demoFilter = new IntentFilter();
if (DEBUG_MEDIA_FAKE_ARTWORK) {
demoFilter.addAction(ACTION_FAKE_ARTWORK);
}
demoFilter.addAction(ACTION_DEMO);
context.registerReceiverAsUser(mDemoReceiver, UserHandle.ALL, demoFilter,
android.Manifest.permission.DUMP, null);
// listen for USER_SETUP_COMPLETE setting (per-user)
mDeviceProvisionedController.addCallback(mUserSetupObserver);
mUserSetupObserver.onUserSetupChanged();
// disable profiling bars, since they overlap and clutter the output on app windows
ThreadedRenderer.overrideProperty("disableProfileBars", "true");
// Private API call to make the shadows look better for Recents
ThreadedRenderer.overrideProperty("ambientRatio", String.valueOf(1.5f));
/* UNISOC: Bug 1074234, 885650, Super power feature @{ */
if(SprdPowerManagerUtil.SUPPORT_SUPER_POWER_SAVE && mNotificationPanel != null){
int mode = SprdPowerManagerUtil.getPowerSaveModeInternal();
if(mFooter != null){
mFooter.setPowerSaveMode(mode);
}
if(mQSPanel != null){
mQSPanel.setPowerSaveMode(mode);
}
if (mNotificationPanel != null){
mNotificationPanel.setPowerSaveMode(mode);
}
/* UNISOC: Modify for bug974161 {@ */
mNavigationBarController.setPowerSaveMode(mode);
/* @} */
}
/* @} */
/* UNISOC: Bug 1104465 add for screen pinning @{ */
mScreenPinningNotify = new ScreenPinningNotify(mContext);
/* @} */
}
在makeStatusBarView(@Nullable RegisterStatusBarResult result)中的 createNavigationBar(result); 就是加载导航栏 直接注释掉就可以了
2、在DisplayPolicy.java中去掉底部导航栏
public boolean hasNavigationBar() {
return mHasNavigationBar;
}
/**
* Return the display height available after excluding any screen
* decorations that could never be removed in Honeycomb. That is, system bar or
* button bar.
*/
public int getNonDecorDisplayHeight(int fullWidth, int fullHeight, int rotation, int uiMode,
DisplayCutout displayCutout) {
int height = fullHeight;
if (hasNavigationBar()) {
final int navBarPosition = navigationBarPosition(fullWidth, fullHeight, rotation);
if (navBarPosition == NAV_BAR_BOTTOM) {
height -= getNavigationBarHeight(rotation, uiMode);
}
}
if (displayCutout != null) {
height -= displayCutout.getSafeInsetTop() + displayCutout.getSafeInsetBottom();
}
return height;
}
/**
* Return the display width available after excluding any screen
* decorations that could never be removed in Honeycomb. That is, system bar or
* button bar.
*/
public int getNonDecorDisplayWidth(int fullWidth, int fullHeight, int rotation, int uiMode,
DisplayCutout displayCutout) {
int width = fullWidth;
if (hasNavigationBar()) {
final int navBarPosition = navigationBarPosition(fullWidth, fullHeight, rotation);
if (navBarPosition == NAV_BAR_LEFT || navBarPosition == NAV_BAR_RIGHT) {
width -= getNavigationBarWidth(rotation, uiMode);
}
}
if (displayCutout != null) {
width -= displayCutout.getSafeInsetLeft() + displayCutout.getSafeInsetRight();
}
return width;
}
根据hasNavigationBar()判断是否有导航栏来就是显示屏幕宽度和高度
所以修改为:
public boolean hasNavigationBar() {
- return mHasNavigationBar;
+ return false;
}
3、默认隐藏导航栏
设置导航栏高度为0
路径:frameworks\base\core\res\res\values\demins.xml
<dimen name="navigation_bar_height">48dp</dimen>
navigation_bar_height 导航栏高度设置为0
4、修改完成记得执行快速编译命令
make snod
然后重启编译备，模拟器或者设备即可看到效果。
参考