Android4.1 关于Rotation相关的Configuration整体分析2
这篇文章继续当旋转手机的时候，系统会做什么操作去通知Activity要旋转界面了。
在上一篇文章中我们看到如果我们在Settings选中了“Auto-rotate”的时候，PhoneWindowManager调用updateOrientationListenerLp去SensorManager里面去注册一个Listener，这样当Sensor发生变化的时候，PhoneWindowManager就可以监听到并且调用回调onProposeRotationChanged。
1. MyOrientationListener.onProposeRotationChange
class MyOrientationListener extends WindowOrientationListener {
@Override
public void onProposedRotationChanged(int rotation) {
if (localLOGV) Log.v(TAG, "onProposedRotationChanged, rotation=" + rotation);
updateRotation(false);
}
}
2. PhoneWindowManager.updateRotation(boolean alwaysSendConfiguration)
注意上面传下来的alwaysSendConfiguration是false。
void updateRotation(boolean alwaysSendConfiguration) {
try {
//set orientation on WindowManager
mWindowManager.updateRotation(alwaysSendConfiguration, false);
} catch (RemoteException e) {
// Ignore
}
}
3. WindowManagerService.updateRotation(boolean alwaysSendConfiguration, boolean forceRelayout)
alwaysSendConfiguration = false;
forceRelayout = false;
updateRotation中直接调用了updateRotatinUnchecked(false, false);
1. 在updateRotatinUnchecked中先通过updateRotationUncheckedLocked(false) 去检测是否Rotation发生改变了。
2. performLayoutAndPlaceSurfacesLocked(); //这个函数太复杂....
3. 如果Rotation发生变化了或者alwaysSendConfiguration为true，就sendNewConfiguration给AMS。
public void updateRotation(boolean alwaysSendConfiguration, boolean forceRelayout) {
updateRotationUnchecked(alwaysSendConfiguration, forceRelayout);
}
public void updateRotationUnchecked(boolean alwaysSendConfiguration, boolean forceRelayout) {
boolean changed;
synchronized(mWindowMap) {
changed = updateRotationUncheckedLocked(false);
if (!changed || forceRelayout) {
getDefaultDisplayContentLocked().layoutNeeded = true;
performLayoutAndPlaceSurfacesLocked();
}
}
if (changed || alwaysSendConfiguration) {
sendNewConfiguration();
}
... ...
}
3.1 WindowManagerService.updateRotationUncheckedLocked(boolean inTransaction) // inTrasaction = false
1. 请求mPolicy.rotationForOrientationLw去获取当前的rotation
2. 如果发现当然的mRotation与刚才取出来的rotation是一样的并且mAltOrientation跟刚才取出来的altOrientation是一样就返回false
要不然就 rotation，altOrientation放在mRotation和mAltOrientation 中保存起来;
3. mPolicy.setRotationLw(mRotation); 把mRotation保存在mOrientationListener的mCurrentRotation中。
4. computeScreenConfigurationLocked()调用这个函数主要是更新Screen size的信息，包括Rotation啊，width，height...
5. mDisplayManagerService.performTraversalInTransactionFromWindowManager();
6. 遍历所有windows，把有Surface的Window的mOrientationChanging设为true.
public boolean updateRotationUncheckedLocked(boolean inTransaction) {
... ...
int rotation = mPolicy.rotationForOrientationLw(mForcedAppOrientation, mRotation);
boolean altOrientation = !mPolicy.rotationHasCompatibleMetricsLw(
mForcedAppOrientation, rotation);
... ...
if (mRotation == rotation && mAltOrientation == altOrientation) {
// No change.
return false;
}
... ...
mRotation = rotation;
mAltOrientation = altOrientation;
mPolicy.setRotationLw(mRotation);
mWindowsFreezingScreen = true;
mH.removeMessages(H.WINDOW_FREEZE_TIMEOUT);
mH.sendMessageDelayed(mH.obtainMessage(H.WINDOW_FREEZE_TIMEOUT),
WINDOW_FREEZE_TIMEOUT_DURATION);
mWaitingForConfig = true;
getDefaultDisplayContentLocked().layoutNeeded = true;
startFreezingDisplayLocked(inTransaction, 0, 0);
// startFreezingDisplayLocked can reset the ScreenRotationAnimation.
screenRotationAnimation =
mAnimator.getScreenRotationAnimationLocked(Display.DEFAULT_DISPLAY);
// We need to update our screen size information to match the new
// rotation. Note that this is redundant with the later call to
// sendNewConfiguration() that must be called after this function
// returns... however we need to do the screen size part of that
// before then so we have the correct size to use when initializing
// the rotation animation for the new rotation.
computeScreenConfigurationLocked(null);
final DisplayContent displayContent = getDefaultDisplayContentLocked();
final DisplayInfo displayInfo = displayContent.getDisplayInfo();
if (!inTransaction) {
if (SHOW_TRANSACTIONS) {
Slog.i(TAG, ">>> OPEN TRANSACTION setRotationUnchecked");
}
Surface.openTransaction();
}
try {
// NOTE: We disable the rotation in the emulator because
// it doesn't support hardware OpenGL emulation yet.
if (CUSTOM_SCREEN_ROTATION && screenRotationAnimation != null
&& screenRotationAnimation.hasScreenshot()) {
if (screenRotationAnimation.setRotationInTransaction(
rotation, mFxSession,
MAX_ANIMATION_DURATION, mTransitionAnimationScale,
displayInfo.logicalWidth, displayInfo.logicalHeight)) {
updateLayoutToAnimationLocked();
}
}
mDisplayManagerService.performTraversalInTransactionFromWindowManager();
} finally {
if (!inTransaction) {
Surface.closeTransaction();
if (SHOW_LIGHT_TRANSACTIONS) {
Slog.i(TAG, "<<< CLOSE TRANSACTION setRotationUnchecked");
}
}
}
final WindowList windows = displayContent.getWindowList();
for (int i = windows.size() - 1; i >= 0; i--) {
WindowState w = windows.get(i);
if (w.mHasSurface) {
if (DEBUG_ORIENTATION) Slog.v(TAG, "Set mOrientationChanging of " + w);
w.mOrientationChanging = true;
mInnerFields.mOrientationChangeComplete = false;
}
}
for (int i=mRotationWatchers.size()-1; i>=0; i--) {
try {
mRotationWatchers.get(i).onRotationChanged(rotation);
} catch (RemoteException e) {
}
}
scheduleNotifyRotationChangedIfNeededLocked(displayContent, rotation);
return true;
}
3.1.1 PhoneWindowManager.rotationForOrientationLw(int orientation, int lastRotation)
1. 通过mOrientationListener.getPropsoeRotation() 从Sensor那边获取建议的Rotation，返回给sensorRotation.
2. 定义一个perferredRotation，然后根据一系列的判断条件找到一个符合条件的Rotation赋值给perferredRotation，
3. 然后再根据传进来的应用程序自己设定的orientation，如果有设定强制哪种横竖屏方式就直接返回与横竖屏对应的Rotation，如果没有强制设定，默认就返回perferredRotation。
public int rotationForOrientationLw(int orientation, int lastRotation) {
... ...
synchronized (mLock) {
int sensorRotation = mOrientationListener.getProposedRotation(); // may be -1
if (sensorRotation < 0) {
sensorRotation = lastRotation;
}
final int preferredRotation;
if (mLidState == LID_OPEN && mLidOpenRotation >= 0) {
// Ignore sensor when lid switch is open and rotation is forced.
preferredRotation = mLidOpenRotation;
} else if (mDockMode == Intent.EXTRA_DOCK_STATE_CAR
&& (mCarDockEnablesAccelerometer || mCarDockRotation >= 0)) {
// Ignore sensor when in car dock unless explicitly enabled.
// This case can override the behavior of NOSENSOR, and can also
// enable 180 degree rotation while docked.
preferredRotation = mCarDockEnablesAccelerometer
? sensorRotation : mCarDockRotation;
} else if ((mDockMode == Intent.EXTRA_DOCK_STATE_DESK
|| mDockMode == Intent.EXTRA_DOCK_STATE_LE_DESK
|| mDockMode == Intent.EXTRA_DOCK_STATE_HE_DESK)
&& (mDeskDockEnablesAccelerometer || mDeskDockRotation >= 0)) {
// Ignore sensor when in desk dock unless explicitly enabled.
// This case can override the behavior of NOSENSOR, and can also
// enable 180 degree rotation while docked.
preferredRotation = mDeskDockEnablesAccelerometer
? sensorRotation : mDeskDockRotation;
} else if (mHdmiPlugged && mHdmiRotationLock) {
// Ignore sensor when plugged into HDMI.
// Note that the dock orientation overrides the HDMI orientation.
preferredRotation = mHdmiRotation;
} else if ((mUserRotationMode == WindowManagerPolicy.USER_ROTATION_FREE
&& (orientation == ActivityInfo.SCREEN_ORIENTATION_USER
|| orientation == ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED))
|| orientation == ActivityInfo.SCREEN_ORIENTATION_SENSOR
|| orientation == ActivityInfo.SCREEN_ORIENTATION_FULL_SENSOR
|| orientation == ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE
|| orientation == ActivityInfo.SCREEN_ORIENTATION_SENSOR_PORTRAIT) {
// Otherwise, use sensor only if requested by the application or enabled
// by default for USER or UNSPECIFIED modes. Does not apply to NOSENSOR.
if (mAllowAllRotations < 0) {
// Can't read this during init() because the context doesn't
// have display metrics at that time so we cannot determine
// tablet vs. phone then.
mAllowAllRotations = mContext.getResources().getBoolean(
com.android.internal.R.bool.config_allowAllRotations) ? 1 : 0;
}
if (sensorRotation != Surface.ROTATION_180
|| mAllowAllRotations == 1
|| orientation == ActivityInfo.SCREEN_ORIENTATION_FULL_SENSOR) {
preferredRotation = sensorRotation;
} else {
preferredRotation = lastRotation;
}
} else if (mUserRotationMode == WindowManagerPolicy.USER_ROTATION_LOCKED
&& orientation != ActivityInfo.SCREEN_ORIENTATION_NOSENSOR) {
// Apply rotation lock. Does not apply to NOSENSOR.
// The idea is that the user rotation expresses a weak preference for the direction
// of gravity and as NOSENSOR is never affected by gravity, then neither should
// NOSENSOR be affected by rotation lock (although it will be affected by docks).
preferredRotation = mUserRotation;
} else {
// No overriding preference.
// We will do exactly what the application asked us to do.
preferredRotation = -1;
}
switch (orientation) {
case ActivityInfo.SCREEN_ORIENTATION_PORTRAIT:
// Return portrait unless overridden.
if (isAnyPortrait(preferredRotation)) {
return preferredRotation;
}
return mPortraitRotation;
case ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE:
// Return landscape unless overridden.
if (isLandscapeOrSeascape(preferredRotation)) {
return preferredRotation;
}
return mLandscapeRotation;
case ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT:
// Return reverse portrait unless overridden.
if (isAnyPortrait(preferredRotation)) {
return preferredRotation;
}
return mUpsideDownRotation;
case ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE:
// Return seascape unless overridden.
if (isLandscapeOrSeascape(preferredRotation)) {
return preferredRotation;
}
return mSeascapeRotation;
case ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE:
// Return either landscape rotation.
if (isLandscapeOrSeascape(preferredRotation)) {
return preferredRotation;
}
if (isLandscapeOrSeascape(lastRotation)) {
return lastRotation;
}
return mLandscapeRotation;
case ActivityInfo.SCREEN_ORIENTATION_SENSOR_PORTRAIT:
// Return either portrait rotation.
if (isAnyPortrait(preferredRotation)) {
return preferredRotation;
}
if (isAnyPortrait(lastRotation)) {
return lastRotation;
}
return mPortraitRotation;
default:
// For USER, UNSPECIFIED, NOSENSOR, SENSOR and FULL_SENSOR,
// just return the preferred orientation we already calculated.
if (preferredRotation >= 0) {
return preferredRotation;
}
return Surface.ROTATION_0;
}
}
3.2 WindowManagerService.performLayoutAndPlaceSurfacesLocked()
1. 在performLayoutAndPlaceSurfacesLocked中就调用了一次performLayoutAndPlaceSurfacesLockedLoop()
private final void performLayoutAndPlaceSurfacesLocked() {
int loopCount = 6;
do {
mTraversalScheduled = false;
performLayoutAndPlaceSurfacesLockedLoop();
mH.removeMessages(H.DO_TRAVERSAL);
loopCount--;
} while (mTraversalScheduled && loopCount > 0);
}
3.3 WindowManagerService.sendNewConfiguration()
1. 去调AMS的updateConfiguration.
void sendNewConfiguration() {
try {
mActivityManager.updateConfiguration(null);
} catch (RemoteException e) {
}
}
3.3.1 updateConfigurationLocked(Configuration values, ActivityRecord starting, boolean persistent, boolean initLocale)
先通过mWindowManager.computeNewConfiguration(); 去获取WMS中最新的configuration，然后通过mSystemThread.applyConfigurationToResources(configCopy);去更新AMS所在进程资源。
1. 通过app.thread.scheduleConfigurationChanged(configCopy); 给让每个进程去update configuration
2. 发送一个Intent.ACTION_CONFIGURATION_CHANGED的broadcast出去。
3. starting = mMainStack.topRunningActivityLocked(null);
kept = mMainStack.ensureActivityConfigurationLocked(starting, changes);
mMainStack.ensureActivitiesVisibleLocked(starting, changes);
boolean updateConfigurationLocked(Configuration values,
ActivityRecord starting, boolean persistent, boolean initLocale) {
// do nothing if we are headless
if (mHeadless) return true;
int changes = 0;
boolean kept = true;
if (values != null) {
Configuration newConfig = new Configuration(mConfiguration);
changes = newConfig.updateFrom(values);
if (changes != 0) {
if (DEBUG_SWITCH || DEBUG_CONFIGURATION) {
Slog.i(TAG, "Updating configuration to: " + values);
}
EventLog.writeEvent(EventLogTags.CONFIGURATION_CHANGED, changes);
if (values.locale != null && !initLocale) {
saveLocaleLocked(values.locale,
!values.locale.equals(mConfiguration.locale),
values.userSetLocale);
}
mConfigurationSeq++;
if (mConfigurationSeq <= 0) {
mConfigurationSeq = 1;
}
newConfig.seq = mConfigurationSeq;
mConfiguration = newConfig;
Slog.i(TAG, "Config changed: " + newConfig);
final Configuration configCopy = new Configuration(mConfiguration);
// TODO: If our config changes, should we auto dismiss any currently
// showing dialogs?
mShowDialogs = shouldShowDialogs(newConfig);
AttributeCache ac = AttributeCache.instance();
if (ac != null) {
ac.updateConfiguration(configCopy);
}
// Make sure all resources in our process are updated
// right now, so that anyone who is going to retrieve
// resource values after we return will be sure to get
// the new ones. This is especially important during
// boot, where the first config change needs to guarantee
// all resources have that config before following boot
// code is executed.
mSystemThread.applyConfigurationToResources(configCopy);
if (persistent && Settings.System.hasInterestingConfigurationChanges(changes)) {
Message msg = mHandler.obtainMessage(UPDATE_CONFIGURATION_MSG);
msg.obj = new Configuration(configCopy);
mHandler.sendMessage(msg);
}
for (int i=mLruProcesses.size()-1; i>=0; i--) {
ProcessRecord app = mLruProcesses.get(i);
try {
if (app.thread != null) {
if (DEBUG_CONFIGURATION) Slog.v(TAG, "Sending to proc "
+ app.processName + " new config " + mConfiguration);
app.thread.scheduleConfigurationChanged(configCopy);
}
} catch (Exception e) {
}
}
Intent intent = new Intent(Intent.ACTION_CONFIGURATION_CHANGED);
intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY
| Intent.FLAG_RECEIVER_REPLACE_PENDING
| Intent.FLAG_RECEIVER_FOREGROUND);
broadcastIntentLocked(null, null, intent, null, null, 0, null, null,
null, false, false, MY_PID, Process.SYSTEM_UID, UserHandle.USER_ALL);
if ((changes&ActivityInfo.CONFIG_LOCALE) != 0) {
intent = new Intent(Intent.ACTION_LOCALE_CHANGED);
intent.addFlags(Intent.FLAG_RECEIVER_FOREGROUND);
broadcastIntentLocked(null, null, intent,
null, null, 0, null, null,
null, false, false, MY_PID, Process.SYSTEM_UID, UserHandle.USER_ALL);
}
}
}
if (changes != 0 && starting == null) {
// If the configuration changed, and the caller is not already
// in the process of starting an activity, then find the top
// activity to check if its configuration needs to change.
starting = mMainStack.topRunningActivityLocked(null);
}
if (starting != null) {
kept = mMainStack.ensureActivityConfigurationLocked(starting, changes);
// And we need to make sure at this point that all other activities
// are made visible with the correct configuration.
mMainStack.ensureActivitiesVisibleLocked(starting, changes);
}
if (values != null && mWindowManager != null) {
mWindowManager.setNewConfiguration(mConfiguration);
}
return kept;
}
3.3.1.1 ActivityThread.handleConfigurationChanged()
1. applyConfigurationToResourcesLocked(config, compat); // 更新该进程的资源相关的东西
2. performConfigurationChanged() // 调用callback的onConfigurationChanged
final void handleConfigurationChanged(Configuration config, CompatibilityInfo compat) {
int configDiff = 0;
synchronized (mPackages) {
... ...
applyConfigurationToResourcesLocked(config, compat);
if (mConfiguration == null) {
mConfiguration = new Configuration();
}
if (!mConfiguration.isOtherSeqNewer(config) && compat == null) {
return;
}
configDiff = mConfiguration.diff(config);
mConfiguration.updateFrom(config);
config = applyCompatConfiguration(mCurDefaultDisplayDpi);
}
ArrayList<ComponentCallbacks2> callbacks = collectComponentCallbacks(false, config);
... ...
if (callbacks != null) {
final int N = callbacks.size();
for (int i=0; i<N; i++) {
performConfigurationChanged(callbacks.get(i), config);
}
}
}
3.3.1.3 ActivityStack.ensureActivityConfigurationLocked(ActivityRecord r, int globalChanges)
final boolean ensureActivityConfigurationLocked(ActivityRecord r,
int globalChanges) {
if (mConfigWillChange) {
if (DEBUG_SWITCH || DEBUG_CONFIGURATION) Slog.v(TAG,
"Skipping config check (will change): " + r);
return true;
}
if (DEBUG_SWITCH || DEBUG_CONFIGURATION) Slog.v(TAG,
"Ensuring correct configuration: " + r);
// Short circuit: if the two configurations are the exact same
// object (the common case), then there is nothing to do.
Configuration newConfig = mService.mConfiguration;
if (r.configuration == newConfig && !r.forceNewConfig) {
if (DEBUG_SWITCH || DEBUG_CONFIGURATION) Slog.v(TAG,
"Configuration unchanged in " + r);
return true;
}
// We don't worry about activities that are finishing.
if (r.finishing) {
if (DEBUG_SWITCH || DEBUG_CONFIGURATION) Slog.v(TAG,
"Configuration doesn't matter in finishing " + r);
r.stopFreezingScreenLocked(false);
return true;
}
// Okay we now are going to make this activity have the new config.
// But then we need to figure out how it needs to deal with that.
Configuration oldConfig = r.configuration;
r.configuration = newConfig;
// Determine what has changed. May be nothing, if this is a config
// that has come back from the app after going idle. In that case
// we just want to leave the official config object now in the
// activity and do nothing else.
final int changes = oldConfig.diff(newConfig);
if (changes == 0 && !r.forceNewConfig) {
if (DEBUG_SWITCH || DEBUG_CONFIGURATION) Slog.v(TAG,
"Configuration no differences in " + r);
return true;
}
// If the activity isn't currently running, just leave the new
// configuration and it will pick that up next time it starts.
if (r.app == null || r.app.thread == null) {
if (DEBUG_SWITCH || DEBUG_CONFIGURATION) Slog.v(TAG,
"Configuration doesn't matter not running " + r);
r.stopFreezingScreenLocked(false);
r.forceNewConfig = false;
return true;
}
// Figure out how to handle the changes between the configurations.
if (DEBUG_SWITCH || DEBUG_CONFIGURATION) {
Slog.v(TAG, "Checking to restart " + r.info.name + ": changed=0x"
+ Integer.toHexString(changes) + ", handles=0x"
+ Integer.toHexString(r.info.getRealConfigChanged())
+ ", newConfig=" + newConfig);
}
if ((changes&(~r.info.getRealConfigChanged())) != 0 || r.forceNewConfig) {
// Aha, the activity isn't handling the change, so DIE DIE DIE.
r.configChangeFlags |= changes;
r.startFreezingScreenLocked(r.app, globalChanges);
r.forceNewConfig = false;
if (r.app == null || r.app.thread == null) {
if (DEBUG_SWITCH || DEBUG_CONFIGURATION) Slog.v(TAG,
"Config is destroying non-running " + r);
destroyActivityLocked(r, true, false, "config");
} else if (r.state == ActivityState.PAUSING) {
// A little annoying: we are waiting for this activity to
// finish pausing. Let's not do anything now, but just
// flag that it needs to be restarted when done pausing.
if (DEBUG_SWITCH || DEBUG_CONFIGURATION) Slog.v(TAG,
"Config is skipping already pausing " + r);
r.configDestroy = true;
return true;
} else if (r.state == ActivityState.RESUMED) {
// Try to optimize this case: the configuration is changing
// and we need to restart the top, resumed activity.
// Instead of doing the normal handshaking, just say
// "restart!".
if (DEBUG_SWITCH || DEBUG_CONFIGURATION) Slog.v(TAG,
"Config is relaunching resumed " + r);
relaunchActivityLocked(r, r.configChangeFlags, true);
r.configChangeFlags = 0;
} else {
if (DEBUG_SWITCH || DEBUG_CONFIGURATION) Slog.v(TAG,
"Config is relaunching non-resumed " + r);
relaunchActivityLocked(r, r.configChangeFlags, false);
r.configChangeFlags = 0;
}
// All done... tell the caller we weren't able to keep this
// activity around.
return false;
}
// Default case: the activity can handle this new configuration, so
// hand it over. Note that we don't need to give it the new
// configuration, since we always send configuration changes to all
// process when they happen so it can just use whatever configuration
// it last got.
if (r.app != null && r.app.thread != null) {
try {
if (DEBUG_CONFIGURATION) Slog.v(TAG, "Sending new config to " + r);
r.app.thread.scheduleActivityConfigurationChanged(r.appToken);
} catch (RemoteException e) {
// If process died, whatever.
}
}
r.stopFreezingScreenLocked(false);
return true;