本文详细解析了Android系统中Configuration更新的整个流程，包括语言切换触发的更新机制、资源更新方式及Activity配置变化的处理。
AndroidConfiguration更新流程分析
当用户发生语言切换事件，就是Configuration中locale值发生改变。
这个函数主要获取AMS代理对象，然后从AMS中获取Configuration对象config
public static void updateLocale(Locale locale) {
IActivityManager am = ActivityManagerNative.getDefault();
Configuration config = am.getConfiguration();
config.setLocale(locale);
config.userSetLocale = true;
am.updateConfiguration(config);
} 1.调用updateConfiguration()方法，本质是调用updateConfigurationLocked()。
am.updateConfiguration(config);
public void updateConfiguration(Configuration values) {
enforceCallingPermission(android.Manifest.permission.CHANGE_CONFIGURATION,
"updateConfiguration()");
synchronized(this) {
if (values == null && mWindowManager != null) {
// sentinel: fetch the current configuration from the window manager
values = mWindowManager.computeNewConfiguration();
}
if (mWindowManager != null) {
mProcessList.applyDisplaySize(mWindowManager);
}
final long origId = Binder.clearCallingIdentity();
if (values != null) {
Settings.System.clearConfiguration(values);
}
updateConfigurationLocked(values, null, false, false);
Binder.restoreCallingIdentity(origId);
}
} public boolean updateConfigurationLocked(Configuration values,
ActivityRecord starting, boolean persistent, boolean initLocale) {
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, values.simSetLocale);
}
mConfigurationSeq++;
if (mConfigurationSeq <= 0) {
mConfigurationSeq = 1;
}
newConfig.seq = mConfigurationSeq;
mConfiguration = newConfig;
Slog.i(TAG, "Config changed: " + newConfig);
final Configuration configCopy = new Configuration(mConfiguration);
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);
broadcastIntentLocked(null, null, intent, null, null, 0, null, null,
null, false, false, MY_PID, Process.SYSTEM_UID);
if ((changes&ActivityInfo.CONFIG_LOCALE) != 0) {
broadcastIntentLocked(null, null,
new Intent(Intent.ACTION_LOCALE_CHANGED),
null, null, 0, null, null,
null, false, false, MY_PID, Process.SYSTEM_UID);
}
}
}
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;
} 1).更新当前的configuration到最新的configuration
2).保证所有的Activity都能更新改变后的configuration
通过调用mSystemThread.applyConfigurationToResources(configCopy);更新系统配置。
通过循环调用app.thread.scheduleConfigurationChanged(configCopy);通知各个进程Configuration改变。
注：在更新configuration或者清除configuration缓存时，是通过changes位标记法来确认修改哪一个configuration选项。
public int updateFrom(Configuration delta) {
int changed = 0;
if (delta.fontScale > 0 && fontScale != delta.fontScale) {
changed |= ActivityInfo.CONFIG_FONT_SCALE;
fontScale = delta.fontScale;
}
if (delta.mcc != 0 && mcc != delta.mcc) {
changed |= ActivityInfo.CONFIG_MCC;
mcc = delta.mcc;
}
if (delta.mnc != 0 && mnc != delta.mnc) {
changed |= ActivityInfo.CONFIG_MNC;
mnc = delta.mnc;
}
if (delta.locale != null
&& (locale == null || !locale.equals(delta.locale))) {
changed |= ActivityInfo.CONFIG_LOCALE;
locale = delta.locale != null
? (Locale) delta.locale.clone() : null;
// If locale has changed, then layout direction is also changed ...
changed |= ActivityInfo.CONFIG_LAYOUT_DIRECTION;
// ... and we need to update the layout direction (represented by the first
// 2 most significant bits in screenLayout).
setLayoutDirection(locale);
}
final int deltaScreenLayoutDir = delta.screenLayout & SCREENLAYOUT_LAYOUTDIR_MASK;
if (deltaScreenLayoutDir != SCREENLAYOUT_LAYOUTDIR_UNDEFINED &&
deltaScreenLayoutDir != (screenLayout & SCREENLAYOUT_LAYOUTDIR_MASK)) {
screenLayout = (screenLayout & ~SCREENLAYOUT_LAYOUTDIR_MASK) | deltaScreenLayoutDir;
changed |= ActivityInfo.CONFIG_LAYOUT_DIRECTION;
}
if (delta.userSetLocale && (!userSetLocale || ((changed & ActivityInfo.CONFIG_LOCALE) != 0)))
{
changed |= ActivityInfo.CONFIG_LOCALE;
userSetLocale = true;
}
if (delta.touchscreen != TOUCHSCREEN_UNDEFINED
&& touchscreen != delta.touchscreen) {
changed |= ActivityInfo.CONFIG_TOUCHSCREEN;
touchscreen = delta.touchscreen;
}
if (delta.keyboard != KEYBOARD_UNDEFINED
&& keyboard != delta.keyboard) {
changed |= ActivityInfo.CONFIG_KEYBOARD;
keyboard = delta.keyboard;
}
if (delta.keyboardHidden != KEYBOARDHIDDEN_UNDEFINED
&& keyboardHidden != delta.keyboardHidden) {
changed |= ActivityInfo.CONFIG_KEYBOARD_HIDDEN;
keyboardHidden = delta.keyboardHidden;
}
if (delta.hardKeyboardHidden != HARDKEYBOARDHIDDEN_UNDEFINED
&& hardKeyboardHidden != delta.hardKeyboardHidden) {
changed |= ActivityInfo.CONFIG_KEYBOARD_HIDDEN;
hardKeyboardHidden = delta.hardKeyboardHidden;
}
if (delta.navigation != NAVIGATION_UNDEFINED
&& navigation != delta.navigation) {
changed |= ActivityInfo.CONFIG_NAVIGATION;
navigation = delta.navigation;
}
if (delta.navigationHidden != NAVIGATIONHIDDEN_UNDEFINED
&& navigationHidden != delta.navigationHidden) {
changed |= ActivityInfo.CONFIG_KEYBOARD_HIDDEN;
navigationHidden = delta.navigationHidden;
}
if (delta.orientation != ORIENTATION_UNDEFINED
&& orientation != delta.orientation) {
changed |= ActivityInfo.CONFIG_ORIENTATION;
orientation = delta.orientation;
}
if (getScreenLayoutNoDirection(delta.screenLayout) !=
(SCREENLAYOUT_SIZE_UNDEFINED | SCREENLAYOUT_LONG_UNDEFINED)
&& (getScreenLayoutNoDirection(screenLayout) !=
getScreenLayoutNoDirection(delta.screenLayout))) {
changed |= ActivityInfo.CONFIG_SCREEN_LAYOUT;
// We need to preserve the previous layout dir bits if they were defined
if ((delta.screenLayout&SCREENLAYOUT_LAYOUTDIR_MASK) == 0) {
screenLayout = (screenLayout&SCREENLAYOUT_LAYOUTDIR_MASK)|delta.screenLayout;
} else {
screenLayout = delta.screenLayout;
}
}
if (delta.uiMode != (UI_MODE_TYPE_UNDEFINED|UI_MODE_NIGHT_UNDEFINED)
&& uiMode != delta.uiMode) {
changed |= ActivityInfo.CONFIG_UI_MODE;
if ((delta.uiMode&UI_MODE_TYPE_MASK) != UI_MODE_TYPE_UNDEFINED) {
uiMode = (uiMode&~UI_MODE_TYPE_MASK)
| (delta.uiMode&UI_MODE_TYPE_MASK);
}
if ((delta.uiMode&UI_MODE_NIGHT_MASK) != UI_MODE_NIGHT_UNDEFINED) {
uiMode = (uiMode&~UI_MODE_NIGHT_MASK)
| (delta.uiMode&UI_MODE_NIGHT_MASK);
}
}
if (delta.screenWidthDp != SCREEN_WIDTH_DP_UNDEFINED
&& screenWidthDp != delta.screenWidthDp) {
changed |= ActivityInfo.CONFIG_SCREEN_SIZE;
screenWidthDp = delta.screenWidthDp;
}
if (delta.screenHeightDp != SCREEN_HEIGHT_DP_UNDEFINED
&& screenHeightDp != delta.screenHeightDp) {
changed |= ActivityInfo.CONFIG_SCREEN_SIZE;
screenHeightDp = delta.screenHeightDp;
}
if (delta.smallestScreenWidthDp != SMALLEST_SCREEN_WIDTH_DP_UNDEFINED
&& smallestScreenWidthDp != delta.smallestScreenWidthDp) {
changed |= ActivityInfo.CONFIG_SMALLEST_SCREEN_SIZE;
smallestScreenWidthDp = delta.smallestScreenWidthDp;
}
if (delta.densityDpi != DENSITY_DPI_UNDEFINED &&
densityDpi != delta.densityDpi) {
changed |= ActivityInfo.CONFIG_DENSITY;
densityDpi = delta.densityDpi;
}
if (delta.compatScreenWidthDp != SCREEN_WIDTH_DP_UNDEFINED) {
compatScreenWidthDp = delta.compatScreenWidthDp;
}
if (delta.compatScreenHeightDp != SCREEN_HEIGHT_DP_UNDEFINED) {
compatScreenHeightDp = delta.compatScreenHeightDp;
}
if (delta.compatSmallestScreenWidthDp != SMALLEST_SCREEN_WIDTH_DP_UNDEFINED) {
compatSmallestScreenWidthDp = delta.compatSmallestScreenWidthDp;
}
if (delta.seq != 0) {
seq = delta.seq;
}
return changed;
}语言改变了，所以changed大于0。
3.更新资源，将configuration应用到Resource中：
首先调用系统进程（及AMS所在进程）通知configuration改变：mSystemThread就是ActivityThread类对象：
public final void applyConfigurationToResources(Configuration config) {
synchronized (mResourcesManager) {
mResourcesManager.applyConfigurationToResourcesLocked(config, null);
}
}4.ActivityThread的applyConfigurationToResources函数直接调用了ResourcesManager的函数applyConfigurationToResourcesLocked
final boolean applyConfigurationToResourcesLocked(Configuration config,
CompatibilityInfo compat) {
if (mResConfiguration == null) {
mResConfiguration = new Configuration();
}
if (!mResConfiguration.isOtherSeqNewer(config) && compat == null) {
return false;
}
int changes = mResConfiguration.updateFrom(config);
mDisplays.clear();
DisplayMetrics defaultDisplayMetrics = getDisplayMetricsLocked();
if (compat != null && (mResCompatibilityInfo == null ||
!mResCompatibilityInfo.equals(compat))) {
mResCompatibilityInfo = compat;
changes |= ActivityInfo.CONFIG_SCREEN_LAYOUT
| ActivityInfo.CONFIG_SCREEN_SIZE
| ActivityInfo.CONFIG_SMALLEST_SCREEN_SIZE;
}
if (config.locale != null) {
Locale.setDefault(config.locale);
}
Resources.updateSystemConfiguration(config, defaultDisplayMetrics, compat);
ApplicationPackageManager.configurationChanged();
Configuration tmpConfig = null;
for (int i = mActiveResources.size() - 1; i >= 0; i--) {
ResourcesKey key = mActiveResources.keyAt(i);
Resources r = mActiveResources.valueAt(i).get();
if (r != null) {
int displayId = key.mDisplayId;
boolean isDefaultDisplay = (displayId == Display.DEFAULT_DISPLAY);
DisplayMetrics dm = defaultDisplayMetrics;
final boolean hasOverrideConfiguration = key.hasOverrideConfiguration();
if (!isDefaultDisplay || hasOverrideConfiguration) {
if (tmpConfig == null) {
tmpConfig = new Configuration();
}
tmpConfig.setTo(config);
if (!isDefaultDisplay) {
dm = getDisplayMetricsLocked(displayId);
applyNonDefaultDisplayMetricsToConfigurationLocked(dm, tmpConfig);
}
if (hasOverrideConfiguration) {
tmpConfig.updateFrom(key.mOverrideConfiguration);
}
r.updateConfiguration(tmpConfig, dm, compat);
} else {
r.updateConfiguration(config, dm, compat);
}
} else {
mActiveResources.removeAt(i);
}
}
return changes != 0;
} public static void updateSystemConfiguration(Configuration config, DisplayMetrics metrics,
CompatibilityInfo compat) {
if (mSystem != null) {
mSystem.updateConfiguration(config, metrics, compat);
//Log.i(TAG, "Updated system resources " + mSystem
// + ": " + mSystem.getConfiguration());
}
}调用Resources.updateSystemConfiguration(config, defaultDisplayMetrics,compat);函数更新系统配置，在Resources类中有一个Resources的静态成员变量mSystem，主要是指向系统资源的（framework-res.apk）。
6.因此这个函数直接调用mSystem.updateConfiguration()函数：实际上还是调用Resources的updateConfiguration函数：
得到远程服务对象在ActivityManagerService在本地的代理，最终调用了AMS的updateConfiguration()来更新系统Configuration。
而Resources包含了一个AssetManager对象,
该对象的核心实现是在AssetManager.cpp中完成的. 然后循环清空mActivityResources资源. 再回到handleConfigurationChanged()函数, 执行完updateSystemConfiguration后, 会循环该进程的所有activity。
public void updateConfiguration(Configuration config,
DisplayMetrics metrics, CompatibilityInfo compat) {
synchronized (mAccessLock) {
if (compat != null) {
mCompatibilityInfo = compat;
}
if (metrics != null) {
mMetrics.setTo(metrics);
}
mCompatibilityInfo.applyToDisplayMetrics(mMetrics);
final int configChanges = calcConfigChanges(config);
if (mConfiguration.locale == null) {
mConfiguration.locale = Locale.getDefault();
mConfiguration.setLayoutDirection(mConfiguration.locale);
}
if (mConfiguration.densityDpi != Configuration.DENSITY_DPI_UNDEFINED) {
mMetrics.densityDpi = mConfiguration.densityDpi;
mMetrics.density = mConfiguration.densityDpi * DisplayMetrics.DENSITY_DEFAULT_SCALE;
}
mMetrics.scaledDensity = mMetrics.density * mConfiguration.fontScale;
String locale = null;
if (mConfiguration.locale != null) {
locale = adjustLanguageTag(mConfiguration.locale.toLanguageTag());
}
final int width, height;
if (mMetrics.widthPixels >= mMetrics.heightPixels) {
width = mMetrics.widthPixels;
height = mMetrics.heightPixels;
} else {
width = mMetrics.heightPixels;
height = mMetrics.widthPixels;
}
final int keyboardHidden;
if (mConfiguration.keyboardHidden == Configuration.KEYBOARDHIDDEN_NO
&& mConfiguration.hardKeyboardHidden == Configuration.HARDKEYBOARDHIDDEN_YES) {
keyboardHidden = Configuration.KEYBOARDHIDDEN_SOFT;
} else {
keyboardHidden = mConfiguration.keyboardHidden;
}
mAssets.setConfiguration(mConfiguration.mcc, mConfiguration.mnc,
locale, mConfiguration.orientation,
mConfiguration.touchscreen,
mConfiguration.densityDpi, mConfiguration.keyboard,
keyboardHidden, mConfiguration.navigation, width, height,
mConfiguration.smallestScreenWidthDp,
mConfiguration.screenWidthDp, mConfiguration.screenHeightDp,
mConfiguration.screenLayout, mConfiguration.uiMode,
Build.VERSION.RESOURCES_SDK_INT);
mDrawableCache.onConfigurationChange(configChanges);
mColorDrawableCache.onConfigurationChange(configChanges);
mColorStateListCache.onConfigurationChange(configChanges);
mAnimatorCache.onConfigurationChange(configChanges);
mStateListAnimatorCache.onConfigurationChange(configChanges);
flushLayoutCache();
}
注：DisplayMetrics类:Android可以设置随窗口大小，调整缩放比例，但如此，手机程序设计人员还是必须知道手机屏幕的边界，以免造成缩放布局变形，手机分辨率是手机的一项重要信息，所以在这里，我们的参数要传入metrics以便在语言改变时，或者其他配置改变时造成界面布局的变形。
7.Resources成员变量mAssets 是AssetManager类对象主要用于访问资源，mAssets.setConfiguration函数这个函数是一个native函数：8.native函数：android_content_AssetManager_setConfiguration();
static void android_content_AssetManager_setConfiguration(JNIEnv* env, jobject clazz,
jint mcc, jint mnc, jstring locale, jint orientation, jint touchscreen, jint density,
jint keyboard, jint keyboardHidden, jint navigation, jint screenWidth, jint screenHeight, jint smallestScreenWidthDp, jint screenWidthDp, jint screenHeightDp,
jint screenLayout, jint uiMode, jint sdkVersion){
AssetManager* am = assetManagerForJavaObject(env, clazz);
ResTable_config config;
memset(&config, 0, sizeof(config));
const char* locale8 = locale != NULL ? env->GetStringUTFChars(locale, NULL) : NULL;
static const jint kScreenLayoutRoundMask = 0x300;
static const jint kScreenLayoutRoundShift = 8;
config.mcc = (uint16_t)mcc;
config.mnc = (uint16_t)mnc;
config.orientation = (uint8_t)orientation;
config.touchscreen = (uint8_t)touchscreen;
config.density = (uint16_t)density;
config.keyboard = (uint8_t)keyboard;
config.inputFlags = (uint8_t)keyboardHidden;
config.navigation = (uint8_t)navigation;
config.screenWidth = (uint16_t)screenWidth;
config.screenHeight = (uint16_t)screenHeight;
config.smallestScreenWidthDp = (uint16_t)smallestScreenWidthDp;
config.screenWidthDp = (uint16_t)screenWidthDp;
config.screenHeightDp = (uint16_t)screenHeightDp;
config.screenLayout = (uint8_t)screenLayout;
config.uiMode = (uint8_t)uiMode;
config.sdkVersion = (uint16_t)sdkVersion;
config.minorVersion = 0;
config.screenLayout2 = (uint8_t)((screenLayout & kScreenLayoutRoundMask) >> kScreenLayoutRoundShift);
am->setConfiguration(config, locale8);
if (locale != NULL) env->ReleaseStringUTFChars(locale, locale8);
}
9.各组件回调反馈：
刚才我们说到首先看到的是mLurProcesses 是ArrayList类型. LRU : Least Recently Used保存所有运行过的进程. ProcessRecord进程类, 一个apk文件运行时会对应一个进程. app.thread. 此处的thread代表的是ApplicationThreadNative.java类型. 然后调用其scheduleConfigurationChanged(); 其中scheduleConfigurationChanged()实际是通过Binder远程调用(该过程同步)ActivityThread中的同名方法。查看该函数。
public final void scheduleConfigurationChanged(Configuration config)
throws RemoteException {
Parcel data = Parcel.obtain();
data.writeInterfaceToken(IApplicationThread.descriptor);
config.writeToParcel(data, 0);
mRemote.transact(SCHEDULE_CONFIGURATION_CHANGED_TRANSACTION, data, null,
IBinder.FLAG_ONEWAY);
data.recycle();
} 10.这个函数只是往消息队列里面发送了一条CONFIGURATION_CHANGED的消息。
public boolean transact(int code, Parcel data, Parcel reply, int flags)throws RemoteException;public void handleMessage(Message msg) {
if (DEBUG_MESSAGES) Slog.v(TAG, ">>> handling: " + codeToString(msg.what));
switch (msg.what) {
case LAUNCH_ACTIVITY: {
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "activityStart");
ActivityClientRecord r = (ActivityClientRecord)msg.obj;
r.packageInfo = getPackageInfoNoCheck(
r.activityInfo.applicationInfo, r.compatInfo);
handleLaunchActivity(r, null);
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
} break;
case RELAUNCH_ACTIVITY: {
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "activityRestart");
ActivityClientRecord r = (ActivityClientRecord)msg.obj;
handleRelaunchActivity(r);
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
} break;
case PAUSE_ACTIVITY:
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "activityPause");
handlePauseActivity((IBinder)msg.obj, false, msg.arg1 != 0, msg.arg2);
maybeSnapshot();
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
break;
case PAUSE_ACTIVITY_FINISHING:
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "activityPause");
handlePauseActivity((IBinder)msg.obj, true, msg.arg1 != 0, msg.arg2);
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
break;
case STOP_ACTIVITY_SHOW:
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "activityStop");
handleStopActivity((IBinder)msg.obj, true, msg.arg2);
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
break;
case STOP_ACTIVITY_HIDE:
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "activityStop");
handleStopActivity((IBinder)msg.obj, false, msg.arg2);
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
break;
case SHOW_WINDOW:
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "activityShowWindow");
handleWindowVisibility((IBinder)msg.obj, true);
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
break;
case HIDE_WINDOW:
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "activityHideWindow");
handleWindowVisibility((IBinder)msg.obj, false);
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
break;
case RESUME_ACTIVITY:
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "activityResume");
handleResumeActivity((IBinder)msg.obj, true,
msg.arg1 != 0, true);
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
break;
case SEND_RESULT:
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "activityDeliverResult");
handleSendResult((ResultData)msg.obj);
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
break;
case DESTROY_ACTIVITY:
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "activityDestroy");
handleDestroyActivity((IBinder)msg.obj, msg.arg1 != 0,
msg.arg2, false);
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
break;
case BIND_APPLICATION:
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "bindApplication");
AppBindData data = (AppBindData)msg.obj;
handleBindApplication(data);
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
break;
case EXIT_APPLICATION:
if (mInitialApplication != null) {
mInitialApplication.onTerminate();
}
Looper.myLooper().quit();
break;
case NEW_INTENT:
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "activityNewIntent");
handleNewIntent((NewIntentData)msg.obj);
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
break;
case RECEIVER:
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "broadcastReceiveComp");
handleReceiver((ReceiverData)msg.obj);
maybeSnapshot();
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
break;
case CREATE_SERVICE:
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "serviceCreate");
handleCreateService((CreateServiceData)msg.obj);
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
break;
case BIND_SERVICE:
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "serviceBind");
handleBindService((BindServiceData)msg.obj);
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
break;
case UNBIND_SERVICE:
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "serviceUnbind");
handleUnbindService((BindServiceData)msg.obj);
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
break;
case SERVICE_ARGS:
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "serviceStart");
handleServiceArgs((ServiceArgsData)msg.obj);
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
break;
case STOP_SERVICE:
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "serviceStop");
handleStopService((IBinder)msg.obj);
maybeSnapshot();
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
break;
case REQUEST_THUMBNAIL:
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "requestThumbnail");
handleRequestThumbnail((IBinder)msg.obj);
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
break;
case CONFIGURATION_CHANGED:
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "configChanged");
mCurDefaultDisplayDpi = ((Configuration)msg.obj).densityDpi;
handleConfigurationChanged((Configuration)msg.obj, null);
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
break;
case CLEAN_UP_CONTEXT:
ContextCleanupInfo cci = (ContextCleanupInfo)msg.obj;
cci.context.performFinalCleanup(cci.who, cci.what);
break;
case GC_WHEN_IDLE:
scheduleGcIdler();
break;
case DUMP_SERVICE:
handleDumpService((DumpComponentInfo)msg.obj);
break;
case LOW_MEMORY:
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "lowMemory");
handleLowMemory();
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
break;
case ACTIVITY_CONFIGURATION_CHANGED:
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "activityConfigChanged");
handleActivityConfigurationChanged((IBinder)msg.obj);
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
break;
case PROFILER_CONTROL:
handleProfilerControl(msg.arg1 != 0, (ProfilerControlData)msg.obj, msg.arg2);
break;
case CREATE_BACKUP_AGENT:
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "backupCreateAgent");
handleCreateBackupAgent((CreateBackupAgentData)msg.obj);
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
break;
case DESTROY_BACKUP_AGENT:
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "backupDestroyAgent");
handleDestroyBackupAgent((CreateBackupAgentData)msg.obj);
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
break;
case SUICIDE:
Process.killProcess(Process.myPid());
break;
case REMOVE_PROVIDER:
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "providerRemove");
completeRemoveProvider((ProviderRefCount)msg.obj);
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
break;
case ENABLE_JIT:
ensureJitEnabled();
break;
case DISPATCH_PACKAGE_BROADCAST:
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "broadcastPackage");
handleDispatchPackageBroadcast(msg.arg1, (String[])msg.obj);
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
break;
case SCHEDULE_CRASH:
throw new RemoteServiceException((String)msg.obj);
case DUMP_HEAP:
handleDumpHeap(msg.arg1 != 0, (DumpHeapData)msg.obj);
break;
case DUMP_ACTIVITY:
handleDumpActivity((DumpComponentInfo)msg.obj);
break;
case DUMP_PROVIDER:
handleDumpProvider((DumpComponentInfo)msg.obj);
break;
case SLEEPING:
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "sleeping");
handleSleeping((IBinder)msg.obj, msg.arg1 != 0);
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
break;
case SET_CORE_SETTINGS:
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "setCoreSettings");
handleSetCoreSettings((Bundle) msg.obj);
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
break;
case UPDATE_PACKAGE_COMPATIBILITY_INFO:
handleUpdatePackageCompatibilityInfo((UpdateCompatibilityData)msg.obj);
break;
case TRIM_MEMORY:
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "trimMemory");
handleTrimMemory(msg.arg1);
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
break;
case UNSTABLE_PROVIDER_DIED:
handleUnstableProviderDied((IBinder)msg.obj, false);
break;
case REQUEST_ASSIST_CONTEXT_EXTRAS:
handleRequestAssistContextExtras((RequestAssistContextExtras)msg.obj);
break;
case TRANSLUCENT_CONVERSION_COMPLETE:
handleTranslucentConversionComplete((IBinder)msg.obj, msg.arg1 == 1);
break;
case INSTALL_PROVIDER:
handleInstallProvider((ProviderInfo) msg.obj);
break;
}
if (DEBUG_MESSAGES) Slog.v(TAG, "<<< done: " + codeToString(msg.what));
}11.在处理CONFIGURATION_CHANGED这条消息时就调用到了函数：
final void handleConfigurationChanged(Configuration config, CompatibilityInfo compat) {
int configDiff = 0;
synchronized (mResourcesManager) {
if (mPendingConfiguration != null) {
if (!mPendingConfiguration.isOtherSeqNewer(config)) {
config = mPendingConfiguration;
mCurDefaultDisplayDpi = config.densityDpi;
updateDefaultDensity();
}
mPendingConfiguration = null;
}
if (config == null) {
return;
}
if (DEBUG_CONFIGURATION) Slog.v(TAG, "Handle configuration changed: "
+ config);
mResourcesManager.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);
// Cleanup hardware accelerated stuff
WindowManagerGlobal.getInstance().trimLocalMemory();
freeTextLayoutCachesIfNeeded(configDiff);
if (callbacks != null) {
final int N = callbacks.size();
for (int i=0; i<N; i++) {
performConfigurationChanged(callbacks.get(i), config);
}
}
}12.再来看performConfigurationChanged的实现:
该函数判断configuration是否改变, 如果改变那么shouldChangeConfig为true. 然后调用activity的onConfigurationChange(config);
private final void performConfigurationChanged(ComponentCallbacks2 cb, Configuration config) {
// Only for Activity objects, check that they actually call up to their
// superclass implementation. ComponentCallbacks2 is an interface, so
// we check the runtime type and act accordingly.
Activity activity = (cb instanceof Activity) ? (Activity) cb : null;
if (activity != null) {
activity.mCalled = false;
}
boolean shouldChangeConfig = false;
if ((activity == null) || (activity.mCurrentConfig == null)) {
shouldChangeConfig = true;
} else {
// If the new config is the same as the config this Activity
// is already running with then don't bother calling
// onConfigurationChanged
int diff = activity.mCurrentConfig.diff(config);
if (diff != 0) {
// If this activity doesn't handle any of the config changes
// then don't bother calling onConfigurationChanged as we're
// going to destroy it.
if ((~activity.mActivityInfo.getRealConfigChanged() & diff) == 0) {
shouldChangeConfig = true;
}
}
}
if (DEBUG_CONFIGURATION) Slog.v(TAG, "Config callback " + cb
+ ": shouldChangeConfig=" + shouldChangeConfig);
if (shouldChangeConfig) {
cb.onConfigurationChanged(config);
if (activity != null) {
if (!activity.mCalled) {
throw new SuperNotCalledException(
"Activity " + activity.getLocalClassName() +
" did not call through to super.onConfigurationChanged()");
}
activity.mConfigChangeFlags = 0;
activity.mCurrentConfig = new Configuration(config);
}
}
} public void onConfigurationChanged(Configuration newConfig) {
mCalled = true;
mFragments.dispatchConfigurationChanged(newConfig);
if (mWindow != null) {
// Pass the configuration changed event to the window
mWindow.onConfigurationChanged(newConfig);
}
if (mActionBar != null) {
// Do this last; the action bar will need to access
// view changes from above.
mActionBar.onConfigurationChanged(newConfig);
}
}
5.各组件回调反馈：
9.各组件回调反馈：
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