其中左侧为 TASKBAR 右侧为 NavigationBar
Launcher 中TaskBar的显示控制在 packages\apps\Launcher3\src\com\android\launcher3\config\FeatureFlags.java
public static final BooleanFlag ENABLE_TASKBAR = getDebugFlag(
"ENABLE_TASKBAR", false, "Allows a system Taskbar to be shown on larger devices.");
packages\apps\Launcher3\src\com\android\launcher3\DeviceProfile.java 使用 ENABLE_TASKBAR
isTablet = info.isTablet(windowBounds);
isTaskbarPresent = isTablet && ApiWrapper.TASKBAR_DRAWN_IN_PROCESS && FeatureFlags.ENABLE_TASKBAR.get();
if (isTaskbarPresent) {
taskbarSize = res.getDimensionPixelSize(R.dimen.taskbar_size);
}
在 systemUI里 也有相关的控制
/** @return {@code true} if taskbar is enabled, false otherwise */
private boolean initializeTaskbarIfNecessary() {
if (mIsTablet) {
// Remove navigation bar when taskbar is showing
removeNavigationBar(mContext.getDisplayId());
mTaskbarDelegate.init(mContext.getDisplayId());
} else {
mTaskbarDelegate.destroy();
}
return mIsTablet;
}
mIsTablet = isTablet(mContext);
frameworks\base\packages\SystemUI\shared\src\com\android\systemui\shared\recents\utilities\Utilities.java
/** @return whether or not {@param context} represents that of a large screen device or not */
@TargetApi(Build.VERSION_CODES.R)
public static boolean isTablet(Context context) {
final WindowManager windowManager = context.getSystemService(WindowManager.class);
final Rect bounds = windowManager.getCurrentWindowMetrics().getBounds();
float smallestWidth = dpiFromPx(Math.min(bounds.width(), bounds.height()),
context.getResources().getConfiguration().densityDpi);
return smallestWidth >= TABLET_MIN_DPS;
}
创建NavigationBars的时候会判断是否创建了Taskbar
// TODO(b/117478341): I use {@code includeDefaultDisplay} to make this method compatible to
// CarStatusBar because they have their own nav bar. Think about a better way for it.
/**
* Creates navigation bars when car/status bar initializes.
*
* @param includeDefaultDisplay {@code true} to create navigation bar on default display.
*/
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);
}
}
}
/frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBar.java会调用 createNavigationBars
// TODO(b/117478341): This was left such that CarStatusBar can override this method.
// Try to remove this.
protected void createNavigationBar(@Nullable RegisterStatusBarResult result) {
mNavigationBarController.createNavigationBars(true /* includeDefaultDisplay */, result);
}
start----》createAndAddWindows---》makeStatusBarView----》createNavigationBar----》mNavigationBarController.createNavigationBars
public class StatusBar extends SystemUI implements
ActivityStarter,
LifecycleOwner {
public abstract class SystemUI implements Dumpable {
protected final Context mContext;
public SystemUI(Context context) {
mContext = context;
}
public abstract void start();
frameworks\base\services\java\com\android\server\SystemServer.java 启动 startSystemUi
t.traceBegin("StartSystemUI");
try {
startSystemUi(context, windowManagerF);
} catch (Throwable e) {
reportWtf("starting System UI", e);
}
t.traceEnd();
private static void startSystemUi(Context context, WindowManagerService windowManager) {
PackageManagerInternal pm = LocalServices.getService(PackageManagerInternal.class);
Intent intent = new Intent();
intent.setComponent(pm.getSystemUiServiceComponent());
intent.addFlags(Intent.FLAG_DEBUG_TRIAGED_MISSING);
//Slog.d(TAG, "Starting service: " + intent);
context.startServiceAsUser(intent, UserHandle.SYSTEM);
windowManager.onSystemUiStarted();
}
frameworks\base\services\core\java\com\android\server\pm\PackageManagerService.java
@Override public ComponentName getSystemUiServiceComponent() { return ComponentName.unflattenFromString(mContext.getResources().getString( com.android.internal.R.string.config_systemUIServiceComponent)); }
frameworks\base\core\res\res\values\config.xml
<!-- SystemUi service component --> <string name="config_systemUIServiceComponent" translatable="false" >com.android.systemui/com.android.systemui.SystemUIService</string>
frameworks\base\packages\SystemUI\src\com\android\systemui\SystemUIService.java
@Override
public void onCreate() {
super.onCreate();
// Start all of SystemUI
((SystemUIApplication) getApplication()).startServicesIfNeeded();
// Finish initializing dump logic
mLogBufferFreezer.attach(mBroadcastDispatcher);
// If configured, set up a battery notification
if (getResources().getBoolean(R.bool.config_showNotificationForUnknownBatteryState)) {
mBatteryStateNotifier.startListening();
}
// For debugging RescueParty
if (Build.IS_DEBUGGABLE && SystemProperties.getBoolean("debug.crash_sysui", false)) {
throw new RuntimeException();
}
if (Build.IS_DEBUGGABLE) {
// b/71353150 - looking for leaked binder proxies
BinderInternal.nSetBinderProxyCountEnabled(true);
BinderInternal.nSetBinderProxyCountWatermarks(1000,900);
BinderInternal.setBinderProxyCountCallback(
new BinderInternal.BinderProxyLimitListener() {
@Override
public void onLimitReached(int uid) {
Slog.w(SystemUIApplication.TAG,
"uid " + uid + " sent too many Binder proxies to uid "
+ Process.myUid());
}
}, mMainHandler);
}
// Bind the dump service so we can dump extra info during a bug report
startServiceAsUser(
new Intent(getApplicationContext(), SystemUIAuxiliaryDumpService.class),
UserHandle.SYSTEM);
}
frameworks\base\packages\SystemUI\src\com\android\systemui\SystemUIApplication.java
public void startServicesIfNeeded() {
String[] names = SystemUIFactory.getInstance().getSystemUIServiceComponents(getResources());
startServicesIfNeeded(/* metricsPrefix= */ "StartServices", names);
}
frameworks\base\packages\SystemUI\src\com\android\systemui\SystemUIFactory.java
public String[] getSystemUIServiceComponents(Resources resources) {
return resources.getStringArray(R.array.config_systemUIServiceComponents);
}
frameworks\base\packages\SystemUI\res\values\config.xml
<!-- SystemUI Services: The classes of the stuff to start. -->
<string-array name="config_systemUIServiceComponents" translatable="false">
<item>com.android.systemui.util.NotificationChannels</item>
<item>com.android.systemui.keyguard.KeyguardViewMediator</item>
<item>com.android.systemui.recents.Recents</item>
<item>com.android.systemui.volume.VolumeUI</item>
<item>com.android.systemui.statusbar.phone.StatusBar</item>
<item>com.android.systemui.usb.StorageNotification</item>
<item>com.android.systemui.power.PowerUI</item>
<item>com.android.systemui.media.RingtonePlayer</item>
<item>com.android.systemui.keyboard.KeyboardUI</item>
<item>com.android.systemui.shortcut.ShortcutKeyDispatcher</item>
<item>@string/config_systemUIVendorServiceComponent</item>
<item>com.android.systemui.util.leak.GarbageMonitor$Service</item>
<item>com.android.systemui.LatencyTester</item>
<item>com.android.systemui.globalactions.GlobalActionsComponent</item>
<item>com.android.systemui.ScreenDecorations</item>
<item>com.android.systemui.biometrics.AuthController</item>
<item>com.android.systemui.SliceBroadcastRelayHandler</item>
<item>com.android.systemui.statusbar.notification.InstantAppNotifier</item>
<item>com.android.systemui.theme.ThemeOverlayController</item>
<item>com.android.systemui.accessibility.WindowMagnification</item>
<item>com.android.systemui.accessibility.SystemActions</item>
<item>com.android.systemui.toast.ToastUI</item>
<item>com.android.systemui.wmshell.WMShell</item>
</string-array>
private void startServicesIfNeeded(String metricsPrefix, String[] services) {
if (mServicesStarted) {
return;
}
mServices = new SystemUI[services.length];
if (!mBootCompleteCache.isBootComplete()) {
// check to see if maybe it was already completed long before we began
// see ActivityManagerService.finishBooting()
if ("1".equals(SystemProperties.get("sys.boot_completed"))) {
mBootCompleteCache.setBootComplete();
if (DEBUG) {
Log.v(TAG, "BOOT_COMPLETED was already sent");
}
}
}
final DumpManager dumpManager = mSysUIComponent.createDumpManager();
Log.v(TAG, "Starting SystemUI services for user " +
Process.myUserHandle().getIdentifier() + ".");
TimingsTraceLog log = new TimingsTraceLog("SystemUIBootTiming",
Trace.TRACE_TAG_APP);
log.traceBegin(metricsPrefix);
final int N = services.length;
for (int i = 0; i < N; i++) {
String clsName = services[i];
if (DEBUG) Log.d(TAG, "loading: " + clsName);
log.traceBegin(metricsPrefix + clsName);
long ti = System.currentTimeMillis();
try {
SystemUI obj = mComponentHelper.resolveSystemUI(clsName);
if (obj == null) {
Constructor constructor = Class.forName(clsName).getConstructor(Context.class);
obj = (SystemUI) constructor.newInstance(this);
}
mServices[i] = obj;
} catch (ClassNotFoundException
| NoSuchMethodException
| IllegalAccessException
| InstantiationException
| InvocationTargetException ex) {
throw new RuntimeException(ex);
}
if (DEBUG) Log.d(TAG, "running: " + mServices[i]);
mServices[i].start();
log.traceEnd();
// Warn if initialization of component takes too long
ti = System.currentTimeMillis() - ti;
if (ti > 1000) {
Log.w(TAG, "Initialization of " + clsName + " took " + ti + " ms");
}
if (mBootCompleteCache.isBootComplete()) {
mServices[i].onBootCompleted();
}
dumpManager.registerDumpable(mServices[i].getClass().getName(), mServices[i]);
}
mSysUIComponent.getInitController().executePostInitTasks();
log.traceEnd();
mServicesStarted = true;
}
标签：12,java,Tablet,public,SystemUI,靠右,android,com,systemui From： https://www.cnblogs.com/wanglongjiang/p/17638643.html