接着Activity的启动流程分析Window的添加过程，与Activity相关联的window的创建发生在Activity.performLaunchActivity()方法中，当activity实例创建后，会调用该activity的attach()方法，该方法中会创建window的实例，它是一个PhoneWindow对象，但此时该window实例还未设置布局，也未添加到WindowManager中：
Activity.java
final void attach(Context context, ActivityThread aThread,
Instrumentation instr, IBinder token, int ident,
Application application, Intent intent, ActivityInfo info,
CharSequence title, Activity parent, String id,
NonConfigurationInstances lastNonConfigurationInstances,
Configuration config, String referrer, IVoiceInteractor voiceInteractor,
Window window, ActivityConfigCallback activityConfigCallback) {
attachBaseContext(context);
mFragments.attachHost(null /*parent*/);
mWindow = new PhoneWindow(this, window, activityConfigCallback);
mWindow.setWindowControllerCallback(this);
mWindow.setCallback(this);
mWindow.setOnWindowDismissedCallback(this);
mWindow.getLayoutInflater().setPrivateFactory(this);
if (info.softInputMode != WindowManager.LayoutParams.SOFT_INPUT_STATE_UNSPECIFIED) {
mWindow.setSoftInputMode(info.softInputMode);
}
if (info.uiOptions != 0) {
mWindow.setUiOptions(info.uiOptions);
}
mUiThread = Thread.currentThread();
mMainThread = aThread;
mInstrumentation = instr;
mToken = token;
mIdent = ident;
mApplication = application;
mIntent = intent;
mReferrer = referrer;
mComponent = intent.getComponent();
mActivityInfo = info;
mTitle = title;
mParent = parent;
mEmbeddedID = id;
mLastNonConfigurationInstances = lastNonConfigurationInstances;
if (voiceInteractor != null) {
if (lastNonConfigurationInstances != null) {
mVoiceInteractor = lastNonConfigurationInstances.voiceInteractor;
} else {
mVoiceInteractor = new VoiceInteractor(voiceInteractor, this, this,
Looper.myLooper());
}
}
mWindow.setWindowManager(
(WindowManager)context.getSystemService(Context.WINDOW_SERVICE),
mToken, mComponent.flattenToString(),
(info.flags & ActivityInfo.FLAG_HARDWARE_ACCELERATED) != 0);
if (mParent != null) {
mWindow.setContainer(mParent.getWindow());
}
mWindowManager = mWindow.getWindowManager();
mCurrentConfig = config;
mWidow.setColorMode(info.colorMode);
}
这是通过Window.setWindowManager()设置该Window的WindowManager，它是一个WindowManagerImpl实例，它也被赋值给Activity的mWindowManager，并且通过Activity.getSystemService(@ServiceName @NonNull String name)方法返回的就是该WindowManager。
Window.java
/**
* Set the window manager for use by this Window to, for example,
* display panels. This is <em>not</em> used for displaying the
* Window itself -- that must be done by the client.
*
* @param wm The window manager for adding new windows.
*/
public void setWindowManager(WindowManager wm, IBinder appToken, String appName,
boolean hardwareAccelerated) {
mAppToken = appToken;
mAppName = appName;
mHardwareAccelerated = hardwareAccelerated
|| SystemProperties.getBoolean(PROPERTY_HARDWARE_UI, false);
if (wm == null) {
wm = (WindowManager)mContext.getSystemService(Context.WINDOW_SERVICE);
}
mWindowManager = ((WindowManagerImpl)wm).createLocalWindowManager(this);
}
随后在Activity的onCreate()方法中通过setContentView为window对象设置了一个布局。onResume生命周期回调后，采用使用WindowManager将Window真正添加到其中。这里可以发现，如果不指定要设置的布局参数，它会将View的布局参数设置为new ViewGroup.LayoutParams(MATCH_PARENT, MATCH_PARENT)，这也是为什么在使用DialogFragment时，通过onCreateView创建的视图的根结点布局参数会被覆盖。
PhoneWindow.java
@Override
public void setContentView(View view) {
setContentView(view, new ViewGroup.LayoutParams(MATCH_PARENT, MATCH_PARENT));
}
ActivityThread.java
final void handleResumeActivity(IBinder token,
boolean clearHide, boolean isForward, boolean reallyResume, int seq, String reason) {
ActivityClientRecord r = mActivities.get(token);
if (!checkAndUpdateLifecycleSeq(seq, r, "resumeActivity")) {
return;
}
// If we are getting ready to gc after going to the background, well
// we are back active so skip it.
unscheduleGcIdler();
mSomeActivitiesChanged = true;
// TODO Push resumeArgs into the activity for consideration
r = performResumeActivity(token, clearHide, reason);
if (r != null) {
final Activity a = r.activity;
if (localLOGV) Slog.v(
TAG, "Resume " + r + " started activity: " +
a.mStartedActivity + ", hideForNow: " + r.hideForNow
+ ", finished: " + a.mFinished);
final int forwardBit = isForward ?
WindowManager.LayoutParams.SOFT_INPUT_IS_FORWARD_NAVIGATION : 0;
// If the window hasn't yet been added to the window manager,
// and this guy didn't finish itself or start another activity,
// then go ahead and add the window.
boolean willBeVisible = !a.mStartedActivity;
if (!willBeVisible) {
try {
willBeVisible = ActivityManager.getService().willActivityBeVisible(
a.getActivityToken());
} catch (RemoteException e) {
throw e.rethrowFromSystemServer();
}
}
if (r.window == null && !a.mFinished && willBeVisible) {
// 拿到window
r.window = r.activity.getWindow();
View decor = r.window.getDecorView();
decor.setVisibility(View.INVISIBLE);
ViewManager wm = a.getWindowManager();
WindowManager.LayoutParams l = r.window.getAttributes();
a.mDecor = decor;
l.type = WindowManager.LayoutParams.TYPE_BASE_APPLICATION;
l.softInputMode |= forwardBit;
if (r.mPreserveWindow) {
a.mWindowAdded = true;
r.mPreserveWindow = false;
// Normally the ViewRoot sets up callbacks with the Activity
// in addView->ViewRootImpl#setView. If we are instead reusing
// the decor view we have to notify the view root that the
// callbacks may have changed.
ViewRootImpl impl = decor.getViewRootImpl();
if (impl != null) {
impl.notifyChildRebuilt();
}
}
if (a.mVisibleFromClient) {
if (!a.mWindowAdded) {
a.mWindowAdded = true;
// 添加window
wm.addView(decor, l);
} else {
// The activity will get a callback for this {@link LayoutParams} change
// earlier. However, at that time the decor will not be set (this is set
// in this method), so no action will be taken. This call ensures the
// callback occurs with the decor set.
a.onWindowAttributesChanged(l);
}
}
// If the window has already been added, but during resume
// we started another activity, then don't yet make the
// window visible.
} else if (!willBeVisible) {
if (localLOGV) Slog.v(
TAG, "Launch " + r + " mStartedActivity set");
r.hideForNow = true;
}
// Get rid of anything left hanging around.
cleanUpPendingRemoveWindows(r, false /* force */);
// The window is now visible if it has been added, we are not
// simply finishing, and we are not starting another activity.
if (!r.activity.mFinished && willBeVisible
&& r.activity.mDecor != null && !r.hideForNow) {
if (r.newConfig != null) {
performConfigurationChangedForActivity(r, r.newConfig);
if (DEBUG_CONFIGURATION) Slog.v(TAG, "Resuming activity "
+ r.activityInfo.name + " with newConfig " + r.activity.mCurrentConfig);
r.newConfig = null;
}
if (localLOGV) Slog.v(TAG, "Resuming " + r + " with isForward="
+ isForward);
WindowManager.LayoutParams l = r.window.getAttributes();
if ((l.softInputMode
& WindowManager.LayoutParams.SOFT_INPUT_IS_FORWARD_NAVIGATION)
!= forwardBit) {
l.softInputMode = (l.softInputMode
& (~WindowManager.LayoutParams.SOFT_INPUT_IS_FORWARD_NAVIGATION))
| forwardBit;
if (r.activity.mVisibleFromClient) {
ViewManager wm = a.getWindowManager();
View decor = r.window.getDecorView();
wm.updateViewLayout(decor, l);
}
}
r.activity.mVisibleFromServer = true;
mNumVisibleActivities++;
if (r.activity.mVisibleFromClient) {
r.activity.makeVisible();
}
}
if (!r.onlyLocalRequest) {
r.nextIdle = mNewActivities;
mNewActivities = r;
if (localLOGV) Slog.v(
TAG, "Scheduling idle handler for " + r);
Looper.myQueue().addIdleHandler(new Idler());
}
r.onlyLocalRequest = false;
// Tell the activity manager we have resumed.
if (reallyResume) {
try {
ActivityManager.getService().activityResumed(token);
} catch (RemoteException ex) {
throw ex.rethrowFromSystemServer();
}
}
} else {
// If an exception was thrown when trying to resume, then
// just end this activity.
try {
ActivityManager.getService()
.finishActivity(token, Activity.RESULT_CANCELED, null,
Activity.DONT_FINISH_TASK_WITH_ACTIVITY);
} catch (RemoteException ex) {
throw ex.rethrowFromSystemServer();
}
}
}
现在我们聚焦到上面的wm.addView(decor, l)调用，其中当前Activity对应的Window，它是一个PhoneWindow实例，另外几个对象的实例定义如下：
wm它是与Activity的Window对象持有的一个
WindowManagerImpl实例decor它是该
PhoneWindow的DecorViewl它是该
PhoneWindow的布局参数，其默认值采用如下构造器进行初始化。public interface WindowManager extends ViewManager { public static class LayoutParams extends ViewGroup.LayoutParams implements Parcelable { public LayoutParams() { super(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT); type = TYPE_APPLICATION; format = PixelFormat.OPAQUE; } } }
其中WindowManagerImpl用于为绑定到特定context、display或父window的操作提供与系统window manager进行低层级的通信，再看该它是如何添加视图的，可以发现它将添加的工作委托给了WindowManagerGlobal。
WindowManagerImpl.java
@Override
public void addView(@NonNull View view, @NonNull ViewGroup.LayoutParams params) {
applyDefaultToken(params);
mGlobal.addView(view, params, mContext.getDisplay(), mParentWindow);
}
WindowManagerGlobal是一个单例，与WindowManagerImpl相同的是，它也用于为各种操作提供与系统window manager进行低层级的通信。但不与特定的context相关。
WindowManagerGlobal.java
public void addView(View view, ViewGroup.LayoutParams params,
Display display, Window parentWindow) {
if (view == null) {
throw new IllegalArgumentException("view must not be null");
}
if (display == null) {
throw new IllegalArgumentException("display must not be null");
}
if (!(params instanceof WindowManager.LayoutParams)) {
throw new IllegalArgumentException("Params must be WindowManager.LayoutParams");
}
final WindowManager.LayoutParams wparams = (WindowManager.LayoutParams) params;
if (parentWindow != null) {
parentWindow.adjustLayoutParamsForSubWindow(wparams);
} else {
// If there's no parent, then hardware acceleration for this view is
// set from the application's hardware acceleration setting.
final Context context = view.getContext();
if (context != null
&& (context.getApplicationInfo().flags
& ApplicationInfo.FLAG_HARDWARE_ACCELERATED) != 0) {
wparams.flags |= WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED;
}
}
ViewRootImpl root;
View panelParentView = null;
synchronized (mLock) {
// Start watching for system property changes.
if (mSystemPropertyUpdater == null) {
mSystemPropertyUpdater = new Runnable() {
@Override public void run() {
synchronized (mLock) {
for (int i = mRoots.size() - 1; i >= 0; --i) {
mRoots.get(i).loadSystemProperties();
}
}
}
};
SystemProperties.addChangeCallback(mSystemPropertyUpdater);
}
int index = findViewLocked(view, false);
if (index >= 0) {
if (mDyingViews.contains(view)) {
// Don't wait for MSG_DIE to make it's way through root's queue.
mRoots.get(index).doDie();
} else {
throw new IllegalStateException("View " + view
+ " has already been added to the window manager.");
}
// The previous removeView() had not completed executing. Now it has.
}
// If this is a panel window, then find the window it is being
// attached to for future reference.
if (wparams.type >= WindowManager.LayoutParams.FIRST_SUB_WINDOW &&
wparams.type <= WindowManager.LayoutParams.LAST_SUB_WINDOW) {
final int count = mViews.size();
for (int i = 0; i < count; i++) {
if (mRoots.get(i).mWindow.asBinder() == wparams.token) {
panelParentView = mViews.get(i);
}
}
}
root = new ViewRootImpl(view.getContext(), display);
view.setLayoutParams(wparams);
mViews.add(view);
mRoots.add(root);
mParams.add(wparams);
// do this last because it fires off messages to start doing things
try {
root.setView(view, wparams, panelParentView);
} catch (RuntimeException e) {
// BadTokenException or InvalidDisplayException, clean up.
if (index >= 0) {
removeViewLocked(index, true);
}
throw e;
}
}
}
可以发现它新建了一个ViewRootImpl实例，它将PhoneWindow的布局参数设置为DecorView的布局参数，然后调用ViewRootImpl.setView(View view, WindowManager.LayoutParams attrs, View panelParentView)方法。
ViewRootImpl.java
/**
* We have one child
*/
public void setView(View view, WindowManager.LayoutParams attrs, View panelParentView) {
synchronized (this) {
if (mView == null) {
mView = view;
mAttachInfo.mDisplayState = mDisplay.getState();
mDisplayManager.registerDisplayListener(mDisplayListener, mHandler);
mViewLayoutDirectionInitial = mView.getRawLayoutDirection();
mFallbackEventHandler.setView(view);
mWindowAttributes.copyFrom(attrs);
if (mWindowAttributes.packageName == null) {
mWindowAttributes.packageName = mBasePackageName;
}
attrs = mWindowAttributes;
setTag();
if (DEBUG_KEEP_SCREEN_ON && (mClientWindowLayoutFlags
& WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON) != 0
&& (attrs.flags&WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON) == 0) {
Slog.d(mTag, "setView: FLAG_KEEP_SCREEN_ON changed from true to false!");
}
// Keep track of the actual window flags supplied by the client.
mClientWindowLayoutFlags = attrs.flags;
setAccessibilityFocus(null, null);
if (view instanceof RootViewSurfaceTaker) {
mSurfaceHolderCallback =
((RootViewSurfaceTaker)view).willYouTakeTheSurface();
if (mSurfaceHolderCallback != null) {
mSurfaceHolder = new TakenSurfaceHolder();
mSurfaceHolder.setFormat(PixelFormat.UNKNOWN);
mSurfaceHolder.addCallback(mSurfaceHolderCallback);
}
}
// Compute surface insets required to draw at specified Z value.
// TODO: Use real shadow insets for a constant max Z.
if (!attrs.hasManualSurfaceInsets) {
attrs.setSurfaceInsets(view, false /*manual*/, true /*preservePrevious*/);
}
CompatibilityInfo compatibilityInfo =
mDisplay.getDisplayAdjustments().getCompatibilityInfo();
mTranslator = compatibilityInfo.getTranslator();
// If the application owns the surface, don't enable hardware acceleration
if (mSurfaceHolder == null) {
enableHardwareAcceleration(attrs);
}
boolean restore = false;
if (mTranslator != null) {
mSurface.setCompatibilityTranslator(mTranslator);
restore = true;
attrs.backup();
mTranslator.translateWindowLayout(attrs);
}
if (DEBUG_LAYOUT) Log.d(mTag, "WindowLayout in setView:" + attrs);
if (!compatibilityInfo.supportsScreen()) {
attrs.privateFlags |= WindowManager.LayoutParams.PRIVATE_FLAG_COMPATIBLE_WINDOW;
mLastInCompatMode = true;
}
mSoftInputMode = attrs.softInputMode;
mWindowAttributesChanged = true;
mWindowAttributesChangesFlag = WindowManager.LayoutParams.EVERYTHING_CHANGED;
mAttachInfo.mRootView = view;
mAttachInfo.mScalingRequired = mTranslator != null;
mAttachInfo.mApplicationScale =
mTranslator == null ? 1.0f : mTranslator.applicationScale;
if (panelParentView != null) {
mAttachInfo.mPanelParentWindowToken
= panelParentView.getApplicationWindowToken();
}
mAdded = true;
int res; /* = WindowManagerImpl.ADD_OKAY; */
// Schedule the first layout -before- adding to the window
// manager, to make sure we do the relayout before receiving
// any other events from the system.
requestLayout();
if ((mWindowAttributes.inputFeatures
& WindowManager.LayoutParams.INPUT_FEATURE_NO_INPUT_CHANNEL) == 0) {
mInputChannel = new InputChannel();
}
mForceDecorViewVisibility = (mWindowAttributes.privateFlags
& PRIVATE_FLAG_FORCE_DECOR_VIEW_VISIBILITY) != 0;
try {
mOrigWindowType = mWindowAttributes.type;
mAttachInfo.mRecomputeGlobalAttributes = true;
collectViewAttributes();
res = mWindowSession.addToDisplay(mWindow, mSeq, mWindowAttributes
getHostVisibility(), mDisplay.getDisplayId(),
mAttachInfo.mContentInsets, mAttachInfo.mStableInsets,
mAttachInfo.mOutsets, mInputChannel);
} catch (RemoteException e) {
mAdded = false;
mView = null;
mAttachInfo.mRootView = null;
mInputChannel = null;
mFallbackEventHandler.setView(null);
unscheduleTraversals();
setAccessibilityFocus(null, null);
throw new RuntimeException("Adding window failed", e);
} finally {
if (restore) {
attrs.restore();
}
}
if (mTranslator != null) {
mTranslator.translateRectInScreenToAppWindow(mAttachInfo.mContentInsets);
}
mPendingOverscanInsets.set(0, 0, 0, 0);
mPendingContentInsets.set(mAttachInfo.mContentInsets);
mPendingStableInsets.set(mAttachInfo.mStableInsets);
mPendingVisibleInsets.set(0, 0, 0, 0);
mAttachInfo.mAlwaysConsumeNavBar =
(res & WindowManagerGlobal.ADD_FLAG_ALWAYS_CONSUME_NAV_BAR) != 0;
mPendingAlwaysConsumeNavBar = mAttachInfo.mAlwaysConsumeNavBar;
if (DEBUG_LAYOUT) Log.v(mTag, "Added window " + mWindow);
if (res < WindowManagerGlobal.ADD_OKAY) {
mAttachInfo.mRootView = null;
mAdded = false;
mFallbackEventHandler.setView(null);
unscheduleTraversals();
setAccessibilityFocus(null, null);
switch (res) {
case WindowManagerGlobal.ADD_BAD_APP_TOKEN:
case WindowManagerGlobal.ADD_BAD_SUBWINDOW_TOKEN:
throw new WindowManager.BadTokenException(
"Unable to add window -- token " + attrs.token
+ " is not valid; is your activity running?");
case WindowManagerGlobal.ADD_NOT_APP_TOKEN:
throw new WindowManager.BadTokenException(
"Unable to add window -- token " + attrs.token
+ " is not for an application");
case WindowManagerGlobal.ADD_APP_EXITING:
throw new WindowManager.BadTokenException(
"Unable to add window -- app for token " + attrs.token
+ " is exiting");
case WindowManagerGlobal.ADD_DUPLICATE_ADD:
throw new WindowManager.BadTokenException(
"Unable to add window -- window " + mWindow
+ " has already been added");
case WindowManagerGlobal.ADD_STARTING_NOT_NEEDED:
// Silently ignore -- we would have just removed it
// right away, anyway.
return;
case WindowManagerGlobal.ADD_MULTIPLE_SINGLETON:
throw new WindowManager.BadTokenException("Unable to add window "
+ mWindow + " -- another window of type "
+ mWindowAttributes.type + " already exists");
case WindowManagerGlobal.ADD_PERMISSION_DENIED:
throw new WindowManager.BadTokenException("Unable to add window "
+ mWindow + " -- permission denied for window type "
+ mWindowAttributes.type);
case WindowManagerGlobal.ADD_INVALID_DISPLAY:
throw new WindowManager.InvalidDisplayException("Unable to add window "
+ mWindow + " -- the specified display can not be found");
case WindowManagerGlobal.ADD_INVALID_TYPE:
throw new WindowManager.InvalidDisplayException("Unable to add window "
+ mWindow + " -- the specified window type "
+ mWindowAttributes.type + " is not valid");
}
throw new RuntimeException(
"Unable to add window -- unknown error code " + res);
}
if (view instanceof RootViewSurfaceTaker) {
mInputQueueCallback =
((RootViewSurfaceTaker)view).willYouTakeTheInputQueue();
}
if (mInputChannel != null) {
if (mInputQueueCallback != null) {
mInputQueue = new InputQueue();
mInputQueueCallback.onInputQueueCreated(mInputQueue);
}
mInputEventReceiver = new WindowInputEventReceiver(mInputChannel,
Looper.myLooper());
}
view.assignParent(this);
mAddedTouchMode = (res & WindowManagerGlobal.ADD_FLAG_IN_TOUCH_MODE) != 0;
mAppVisible = (res & WindowManagerGlobal.ADD_FLAG_APP_VISIBLE) != 0;
if (mAccessibilityManager.isEnabled()) {
mAccessibilityInteractionConnectionManager.ensureConnection();
}
if (view.getImportantForAccessibility() == View.IMPORTANT_FOR_ACCESSIBILITY_AUTO) {
view.setImportantForAccessibility(View.IMPORTANT_FOR_ACCESSIBILITY_YES);
}
// Set up the input pipeline.
CharSequence counterSuffix = attrs.getTitle();
mSyntheticInputStage = new SyntheticInputStage();
InputStage viewPostImeStage = new ViewPostImeInputStage(mSyntheticInputStage);
InputStage nativePostImeStage = new NativePostImeInputStage(viewPostImeStage,
"aq:native-post-ime:" + counterSuffix);
InputStage earlyPostImeStage = new EarlyPostImeInputStage(nativePostImeStage);
InputStage imeStage = new ImeInputStage(earlyPostImeStage,
"aq:ime:" + counterSuffix);
InputStage viewPreImeStage = new ViewPreImeInputStage(imeStage);
InputStage nativePreImeStage = new NativePreImeInputStage(viewPreImeStage,
"aq:native-pre-ime:" + counterSuffix);
mFirstInputStage = nativePreImeStage;
mFirstPostImeInputStage = earlyPostImeStage;
mPendingInputEventQueueLengthCounterName = "aq:pending:" + counterSuffix;
}
}
}
@Override
public void requestLayout() {
if (!mHandlingLayoutInLayoutRequest) {
checkThread();
mLayoutRequested = true;
scheduleTraversals();
}
}
最终调用到ViewRootImpl的requestLayout()进行首次布局遍历，完成布局的绘制。然后添加Window进行界面展示，这里拿到一个窗口会话WindowSession，并调用其addToDisplay方法：
Session.java
@Override
public int addToDisplay(IWindow window, int seq, WindowManager.LayoutParams attrs,
int viewVisibility, int displayId, Rect outContentInsets, Rect outStableInsets,
Rect outOutsets, InputChannel outInputChannel) {
return mService.addWindow(this, window, seq, attrs, viewVisibility, displayId,
outContentInsets, outStableInsets, outOutsets, outInputChannel);
}
实际上调用到的是WindowManagerService的添加窗口的方法：
WindowManagerService.java
public int addWindow(Session session, IWindow client, int seq,
WindowManager.LayoutParams attrs, int viewVisibility, int displayId,
Rect outContentInsets, Rect outStableInsets, Rect outOutsets,
InputChannel outInputChannel) {
int[] appOp = new int[1];
int res = mPolicy.checkAddPermission(attrs, appOp);
if (res != WindowManagerGlobal.ADD_OKAY) {
return res;
}
boolean reportNewConfig = false;
WindowState parentWindow = null;
long origId;
final int callingUid = Binder.getCallingUid();
final int type = attrs.type;
synchronized(mWindowMap) {
if (!mDisplayReady) {
throw new IllegalStateException("Display has not been initialialized");
}
final DisplayContent displayContent = mRoot.getDisplayContentOrCreate(displayId);
if (displayContent == null) {
Slog.w(TAG_WM, "Attempted to add window to a display that does not exist: "
+ displayId + ". Aborting.");
return WindowManagerGlobal.ADD_INVALID_DISPLAY;
}
if (!displayContent.hasAccess(session.mUid)
&& !mDisplayManagerInternal.isUidPresentOnDisplay(session.mUid, displayId)) {
Slog.w(TAG_WM, "Attempted to add window to a display for which the application "
+ "does not have access: " + displayId + ". Aborting.");
return WindowManagerGlobal.ADD_INVALID_DISPLAY;
}
if (mWindowMap.containsKey(client.asBinder())) {
Slog.w(TAG_WM, "Window " + client + " is already added");
return WindowManagerGlobal.ADD_DUPLICATE_ADD;
}
if (type >= FIRST_SUB_WINDOW && type <= LAST_SUB_WINDOW) {
parentWindow = windowForClientLocked(null, attrs.token, false);
if (parentWindow == null) {
Slog.w(TAG_WM, "Attempted to add window with token that is not a window: "
+ attrs.token + ". Aborting.");
return WindowManagerGlobal.ADD_BAD_SUBWINDOW_TOKEN;
}
if (parentWindow.mAttrs.type >= FIRST_SUB_WINDOW
&& parentWindow.mAttrs.type <= LAST_SUB_WINDOW) {
Slog.w(TAG_WM, "Attempted to add window with token that is a sub-window: "
+ attrs.token + ". Aborting.");
return WindowManagerGlobal.ADD_BAD_SUBWINDOW_TOKEN;
}
}
if (type == TYPE_PRIVATE_PRESENTATION && !displayContent.isPrivate()) {
Slog.w(TAG_WM, "Attempted to add private presentation window to a non-private display. Aborting.");
return WindowManagerGlobal.ADD_PERMISSION_DENIED;
}
AppWindowToken atoken = null;
final boolean hasParent = parentWindow != null;
// Use existing parent window token for child windows since they go in the same token
// as there parent window so we can apply the same policy on them.
WindowToken token = displayContent.getWindowToken(
hasParent ? parentWindow.mAttrs.token : attrs.token);
// If this is a child window, we want to apply the same type checking rules as the
// parent window type.
final int rootType = hasParent ? parentWindow.mAttrs.type : type;
boolean addToastWindowRequiresToken = false;
if (token == null) {
if (rootType >= FIRST_APPLICATION_WINDOW && rootType <= LAST_APPLICATION_WINDOW) {
Slog.w(TAG_WM, "Attempted to add application window with unknown token "
+ attrs.token + ". Aborting.");
return WindowManagerGlobal.ADD_BAD_APP_TOKEN;
}
if (rootType == TYPE_INPUT_METHOD) {
Slog.w(TAG_WM, "Attempted to add input method window with unknown token "
+ attrs.token + ". Aborting.");
return WindowManagerGlobal.ADD_BAD_APP_TOKEN;
}
if (rootType == TYPE_VOICE_INTERACTION) {
Slog.w(TAG_WM, "Attempted to add voice interaction window with unknown token "
+ attrs.token + ". Aborting.");
return WindowManagerGlobal.ADD_BAD_APP_TOKEN;
}
if (rootType == TYPE_WALLPAPER) {
Slog.w(TAG_WM, "Attempted to add wallpaper window with unknown token "
+ attrs.token + ". Aborting.");
return WindowManagerGlobal.ADD_BAD_APP_TOKEN;
}
if (rootType == TYPE_DREAM) {
Slog.w(TAG_WM, "Attempted to add Dream window with unknown token "
+ attrs.token + ". Aborting.");
return WindowManagerGlobal.ADD_BAD_APP_TOKEN;
}
if (rootType == TYPE_QS_DIALOG) {
Slog.w(TAG_WM, "Attempted to add QS dialog window with unknown token "
+ attrs.token + ". Aborting.");
return WindowManagerGlobal.ADD_BAD_APP_TOKEN;
}
if (rootType == TYPE_ACCESSIBILITY_OVERLAY) {
Slog.w(TAG_WM, "Attempted to add Accessibility overlay window with unknown token "
+ attrs.token + ". Aborting.");
return WindowManagerGlobal.ADD_BAD_APP_TOKEN;
}
if (type == TYPE_TOAST) {
// Apps targeting SDK above N MR1 cannot arbitrary add toast windows.
if (doesAddToastWindowRequireToken(attrs.packageName, callingUid,
parentWindow)) {
Slog.w(TAG_WM, "Attempted to add a toast window with unknown token "
+ attrs.token + ". Aborting.");
return WindowManagerGlobal.ADD_BAD_APP_TOKEN;
}
}
final IBinder binder = attrs.token != null ? attrs.token : client.asBinder();
token = new WindowToken(this, binder, type, false, displayContent,
session.mCanAddInternalSystemWindow);
} else if (rootType >= FIRST_APPLICATION_WINDOW && rootType <= LAST_APPLICATION_WINDOW) {
atoken = token.asAppWindowToken();
if (atoken == null) {
Slog.w(TAG_WM, "Attempted to add window with non-application token "
+ token + ". Aborting.");
return WindowManagerGlobal.ADD_NOT_APP_TOKEN;
} else if (atoken.removed) {
Slog.w(TAG_WM, "Attempted to add window with exiting application token "
+ token + ". Aborting.");
return WindowManagerGlobal.ADD_APP_EXITING;
}
} else if (rootType == TYPE_INPUT_METHOD) {
if (token.windowType != TYPE_INPUT_METHOD) {
Slog.w(TAG_WM, "Attempted to add input method window with bad token "
+ attrs.token + ". Aborting.");
return WindowManagerGlobal.ADD_BAD_APP_TOKEN;
}
} else if (rootType == TYPE_VOICE_INTERACTION) {
if (token.windowType != TYPE_VOICE_INTERACTION) {
Slog.w(TAG_WM, "Attempted to add voice interaction window with bad token "
+ attrs.token + ". Aborting.");
return WindowManagerGlobal.ADD_BAD_APP_TOKEN;
}
} else if (rootType == TYPE_WALLPAPER) {
if (token.windowType != TYPE_WALLPAPER) {
Slog.w(TAG_WM, "Attempted to add wallpaper window with bad token "
+ attrs.token + ". Aborting.");
return WindowManagerGlobal.ADD_BAD_APP_TOKEN;
}
} else if (rootType == TYPE_DREAM) {
if (token.windowType != TYPE_DREAM) {
Slog.w(TAG_WM, "Attempted to add Dream window with bad token "
+ attrs.token + ". Aborting.");
return WindowManagerGlobal.ADD_BAD_APP_TOKEN;
}
} else if (rootType == TYPE_ACCESSIBILITY_OVERLAY) {
if (token.windowType != TYPE_ACCESSIBILITY_OVERLAY) {
Slog.w(TAG_WM, "Attempted to add Accessibility overlay window with bad token "
+ attrs.token + ". Aborting.");
return WindowManagerGlobal.ADD_BAD_APP_TOKEN;
}
} else if (type == TYPE_TOAST) {
// Apps targeting SDK above N MR1 cannot arbitrary add toast windows.
addToastWindowRequiresToken = doesAddToastWindowRequireToken(attrs.packageName,
callingUid, parentWindow);
if (addToastWindowRequiresToken && token.windowType != TYPE_TOAST) {
Slog.w(TAG_WM, "Attempted to add a toast window with bad token "
+ attrs.token + ". Aborting.");
return WindowManagerGlobal.ADD_BAD_APP_TOKEN;
}
} else if (type == TYPE_QS_DIALOG) {
if (token.windowType != TYPE_QS_DIALOG) {
Slog.w(TAG_WM, "Attempted to add QS dialog window with bad token "
+ attrs.token + ". Aborting.");
return WindowManagerGlobal.ADD_BAD_APP_TOKEN;
}
} else if (token.asAppWindowToken() != null) {
Slog.w(TAG_WM, "Non-null appWindowToken for system window of rootType=" + rootType);
// It is not valid to use an app token with other system types; we will
// instead make a new token for it (as if null had been passed in for the token).
attrs.token = null;
token = new WindowToken(this, client.asBinder(), type, false, displayContent,
session.mCanAddInternalSystemWindow);
}
final WindowState win = new WindowState(this, session, client, token, parentWindow,
appOp[0], seq, attrs, viewVisibility, session.mUid,
session.mCanAddInternalSystemWindow);
if (win.mDeathRecipient == null) {
// Client has apparently died, so there is no reason to
// continue.
Slog.w(TAG_WM, "Adding window client " + client.asBinder()
+ " that is dead, aborting.");
return WindowManagerGlobal.ADD_APP_EXITING;
}
if (win.getDisplayContent() == null) {
Slog.w(TAG_WM, "Adding window to Display that has been removed.");
return WindowManagerGlobal.ADD_INVALID_DISPLAY;
}
mPolicy.adjustWindowParamsLw(win.mAttrs);
win.setShowToOwnerOnlyLocked(mPolicy.checkShowToOwnerOnly(attrs));
res = mPolicy.prepareAddWindowLw(win, attrs);
if (res != WindowManagerGlobal.ADD_OKAY) {
return res;
}
final boolean openInputChannels = (outInputChannel != null
&& (attrs.inputFeatures & INPUT_FEATURE_NO_INPUT_CHANNEL) == 0);
if (openInputChannels) {
win.openInputChannel(outInputChannel);
}
// If adding a toast requires a token for this app we always schedule hiding
// toast windows to make sure they don't stick around longer then necessary.
// We hide instead of remove such windows as apps aren't prepared to handle
// windows being removed under them.
//
// If the app is older it can add toasts without a token and hence overlay
// other apps. To be maximally compatible with these apps we will hide the
// window after the toast timeout only if the focused window is from another
// UID, otherwise we allow unlimited duration. When a UID looses focus we
// schedule hiding all of its toast windows.
if (type == TYPE_TOAST) {
if (!getDefaultDisplayContentLocked().canAddToastWindowForUid(callingUid)) {
Slog.w(TAG_WM, "Adding more than one toast window for UID at a time.");
return WindowManagerGlobal.ADD_DUPLICATE_ADD;
}
// Make sure this happens before we moved focus as one can make the
// toast focusable to force it not being hidden after the timeout.
// Focusable toasts are always timed out to prevent a focused app to
// show a focusable toasts while it has focus which will be kept on
// the screen after the activity goes away.
if (addToastWindowRequiresToken
|| (attrs.flags & LayoutParams.FLAG_NOT_FOCUSABLE) == 0
|| mCurrentFocus == null
|| mCurrentFocus.mOwnerUid != callingUid) {
mH.sendMessageDelayed(
mH.obtainMessage(H.WINDOW_HIDE_TIMEOUT, win),
win.mAttrs.hideTimeoutMilliseconds);
}
}
// From now on, no exceptions or errors allowed!
res = WindowManagerGlobal.ADD_OKAY;
if (mCurrentFocus == null) {
mWinAddedSinceNullFocus.add(win);
}
if (excludeWindowTypeFromTapOutTask(type)) {
displayContent.mTapExcludedWindows.add(win);
}
origId = Binder.clearCallingIdentity();
win.attach();
mWindowMap.put(client.asBinder(), win);
if (win.mAppOp != AppOpsManager.OP_NONE) {
int startOpResult = mAppOps.startOpNoThrow(win.mAppOp, win.getOwningUid(),
win.getOwningPackage());
if ((startOpResult != AppOpsManager.MODE_ALLOWED) &&
(startOpResult != AppOpsManager.MODE_DEFAULT)) {
win.setAppOpVisibilityLw(false);
}
}
final boolean hideSystemAlertWindows = !mHidingNonSystemOverlayWindows.isEmpty();
win.setForceHideNonSystemOverlayWindowIfNeeded(hideSystemAlertWindows);
final AppWindowToken aToken = token.asAppWindowToken();
if (type == TYPE_APPLICATION_STARTING && aToken != null) {
aToken.startingWindow = win;
if (DEBUG_STARTING_WINDOW) Slog.v (TAG_WM, "addWindow: " + aToken
+ " startingWindow=" + win);
}
boolean imMayMove = true;
win.mToken.addWindow(win);
if (type == TYPE_INPUT_METHOD) {
win.mGivenInsetsPending = true;
setInputMethodWindowLocked(win);
imMayMove = false;
} else if (type == TYPE_INPUT_METHOD_DIALOG) {
displayContent.computeImeTarget(true /* updateImeTarget */);
imMayMove = false;
} else {
if (type == TYPE_WALLPAPER) {
displayContent.mWallpaperController.clearLastWallpaperTimeoutTime();
displayContent.pendingLayoutChanges |= FINISH_LAYOUT_REDO_WALLPAPER;
} else if ((attrs.flags&FLAG_SHOW_WALLPAPER) != 0) {
displayContent.pendingLayoutChanges |= FINISH_LAYOUT_REDO_WALLPAPER;
} else if (displayContent.mWallpaperController.isBelowWallpaperTarget(win)) {
// If there is currently a wallpaper being shown, and
// the base layer of the new window is below the current
// layer of the target window, then adjust the wallpaper.
// This is to avoid a new window being placed between the
// wallpaper and its target.
displayContent.pendingLayoutChanges |= FINISH_LAYOUT_REDO_WALLPAPER;
}
}
// If the window is being added to a stack that's currently adjusted for IME,
// make sure to apply the same adjust to this new window.
win.applyAdjustForImeIfNeeded();
if (type == TYPE_DOCK_DIVIDER) {
mRoot.getDisplayContent(displayId).getDockedDividerController().setWindow(win);
}
final WindowStateAnimator winAnimator = win.mWinAnimator;
winAnimator.mEnterAnimationPending = true;
winAnimator.mEnteringAnimation = true;
// Check if we need to prepare a transition for replacing window first.
if (atoken != null && atoken.isVisible()
&& !prepareWindowReplacementTransition(atoken)) {
// If not, check if need to set up a dummy transition during display freeze
// so that the unfreeze wait for the apps to draw. This might be needed if
// the app is relaunching.
prepareNoneTransitionForRelaunching(atoken);
}
if (displayContent.isDefaultDisplay) {
final DisplayInfo displayInfo = displayContent.getDisplayInfo();
final Rect taskBounds;
if (atoken != null && atoken.getTask() != null) {
taskBounds = mTmpRect;
atoken.getTask().getBounds(mTmpRect);
} else {
taskBounds = null;
}
if (mPolicy.getInsetHintLw(win.mAttrs, taskBounds, displayInfo.rotation,
displayInfo.logicalWidth, displayInfo.logicalHeight, outContentInsets,
outStableInsets, outOutsets)) {
res |= WindowManagerGlobal.ADD_FLAG_ALWAYS_CONSUME_NAV_BAR;
}
} else {
outContentInsets.setEmpty();
outStableInsets.setEmpty();
}
if (mInTouchMode) {
res |= WindowManagerGlobal.ADD_FLAG_IN_TOUCH_MODE;
}
if (win.mAppToken == null || !win.mAppToken.isClientHidden()) {
res |= WindowManagerGlobal.ADD_FLAG_APP_VISIBLE;
}
mInputMonitor.setUpdateInputWindowsNeededLw();
boolean focusChanged = false;
if (win.canReceiveKeys()) {
focusChanged = updateFocusedWindowLocked(UPDATE_FOCUS_WILL_ASSIGN_LAYERS,
false /*updateInputWindows*/);
if (focusChanged) {
imMayMove = false;
}
}
if (imMayMove) {
displayContent.computeImeTarget(true /* updateImeTarget */);
}
// Don't do layout here, the window must call
// relayout to be displayed, so we'll do it there.
displayContent.assignWindowLayers(false /* setLayoutNeeded */);
if (focusChanged) {
mInputMonitor.setInputFocusLw(mCurrentFocus, false /*updateInputWindows*/);
}
mInputMonitor.updateInputWindowsLw(false /*force*/);
if (localLOGV || DEBUG_ADD_REMOVE) Slog.v(TAG_WM, "addWindow: New client "
+ client.asBinder() + ": window=" + win + " Callers=" + Debug.getCallers(5));
if (win.isVisibleOrAdding() && updateOrientationFromAppTokensLocked(false, displayId)) {
reportNewConfig = true;
}
}
if (reportNewConfig) {
sendNewConfiguration(displayId);
}
Binder.restoreCallingIdentity(origId);
return res;
}
// TODO: Move to DisplayContent
boolean updateFocusedWindowLocked(int mode, boolean updateInputWindows) {
WindowState newFocus = mRoot.computeFocusedWindow();
if (mCurrentFocus != newFocus) {
Trace.traceBegin(TRACE_TAG_WINDOW_MANAGER, "wmUpdateFocus");
// This check makes sure that we don't already have the focus
// change message pending.
mH.removeMessages(H.REPORT_FOCUS_CHANGE);
mH.sendEmptyMessage(H.REPORT_FOCUS_CHANGE);
// TODO(multidisplay): Focused windows on default display only.
final DisplayContent displayContent = getDefaultDisplayContentLocked();
boolean imWindowChanged = false;
if (mInputMethodWindow != null) {
final WindowState prevTarget = mInputMethodTarget;
final WindowState newTarget =
displayContent.computeImeTarget(true /* updateImeTarget*/);
imWindowChanged = prevTarget != newTarget;
if (mode != UPDATE_FOCUS_WILL_ASSIGN_LAYERS
&& mode != UPDATE_FOCUS_WILL_PLACE_SURFACES) {
final int prevImeAnimLayer = mInputMethodWindow.mWinAnimator.mAnimLayer;
displayContent.assignWindowLayers(false /* setLayoutNeeded */);
imWindowChanged |=
prevImeAnimLayer != mInputMethodWindow.mWinAnimator.mAnimLayer;
}
}
if (imWindowChanged) {
mWindowsChanged = true;
displayContent.setLayoutNeeded();
newFocus = mRoot.computeFocusedWindow();
}
if (DEBUG_FOCUS_LIGHT || localLOGV) Slog.v(TAG_WM, "Changing focus from " +
mCurrentFocus + " to " + newFocus + " Callers=" + Debug.getCallers(4));
final WindowState oldFocus = mCurrentFocus;
mCurrentFocus = newFocus;
mLosingFocus.remove(newFocus);
if (mCurrentFocus != null) {
mWinAddedSinceNullFocus.clear();
mWinRemovedSinceNullFocus.clear();
}
int focusChanged = mPolicy.focusChangedLw(oldFocus, newFocus);
if (imWindowChanged && oldFocus != mInputMethodWindow) {
// Focus of the input method window changed. Perform layout if needed.
if (mode == UPDATE_FOCUS_PLACING_SURFACES) {
displayContent.performLayout(true /*initial*/, updateInputWindows);
focusChanged &= ~FINISH_LAYOUT_REDO_LAYOUT;
} else if (mode == UPDATE_FOCUS_WILL_PLACE_SURFACES) {
// Client will do the layout, but we need to assign layers
// for handleNewWindowLocked() below.
displayContent.assignWindowLayers(false /* setLayoutNeeded */);
}
}
if ((focusChanged & FINISH_LAYOUT_REDO_LAYOUT) != 0) {
// The change in focus caused us to need to do a layout. Okay.
displayContent.setLayoutNeeded();
if (mode == UPDATE_FOCUS_PLACING_SURFACES) {
displayContent.performLayout(true /*initial*/, updateInputWindows);
}
}
if (mode != UPDATE_FOCUS_WILL_ASSIGN_LAYERS) {
// If we defer assigning layers, then the caller is responsible for
// doing this part.
mInputMonitor.setInputFocusLw(mCurrentFocus, updateInputWindows);
}
displayContent.adjustForImeIfNeeded();
// We may need to schedule some toast windows to be removed. The toasts for an app that
// does not have input focus are removed within a timeout to prevent apps to redress
// other apps' UI.
displayContent.scheduleToastWindowsTimeoutIfNeededLocked(oldFocus, newFocus);
Trace.traceEnd(TRACE_TAG_WINDOW_MANAGER);
return true;
}
return false;
}
@Override
public void handleMessage(Message msg) {
if (DEBUG_WINDOW_TRACE) {
Slog.v(TAG_WM, "handleMessage: entry what=" + msg.what);
}
switch (msg.what) {
case REPORT_FOCUS_CHANGE: {
WindowState lastFocus;
WindowState newFocus;
AccessibilityController accessibilityController = null;
synchronized(mWindowMap) {
// TODO(multidisplay): Accessibility supported only of default desiplay.
if (mAccessibilityController != null && getDefaultDisplayContentLocked()
.getDisplayId() == DEFAULT_DISPLAY) {
accessibilityController = mAccessibilityController;
}
lastFocus = mLastFocus;
newFocus = mCurrentFocus;
if (lastFocus == newFocus) {
// Focus is not changing, so nothing to do.
return;
}
mLastFocus = newFocus;
if (DEBUG_FOCUS_LIGHT) Slog.i(TAG_WM, "Focus moving from " + lastFocus +
" to " + newFocus);
if (newFocus != null && lastFocus != null
&& !newFocus.isDisplayedLw()) {
//Slog.i(TAG_WM, "Delaying loss of focus...");
mLosingFocus.add(lastFocus);
lastFocus = null;
}
}
// First notify the accessibility manager for the change so it has
// the windows before the newly focused one starts firing eventgs.
if (accessibilityController != null) {
accessibilityController.onWindowFocusChangedNotLocked();
}
//System.out.println("Changing focus from " + lastFocus
// + " to " + newFocus);
if (newFocus != null) {
if (DEBUG_FOCUS_LIGHT) Slog.i(TAG_WM, "Gaining focus: " + newFocus);
newFocus.reportFocusChangedSerialized(true, mInTouchMode);
notifyFocusChanged();
}
if (lastFocus != null) {
if (DEBUG_FOCUS_LIGHT) Slog.i(TAG_WM, "Losing focus: " + lastFocus);
lastFocus.reportFocusChangedSerialized(false, mInTouchMode);
}
} break;
...
}
}
WindowState.java
/**
* Report a focus change. Must be called with no locks held, and consistently
* from the same serialized thread (such as dispatched from a handler).
*/
void reportFocusChangedSerialized(boolean focused, boolean inTouchMode) {
try {
mClient.windowFocusChanged(focused, inTouchMode);
} catch (RemoteException e) {
}
if (mFocusCallbacks != null) {
final int N = mFocusCallbacks.beginBroadcast();
for (int i=0; i<N; i++) {
IWindowFocusObserver obs = mFocusCallbacks.getBroadcastItem(i);
try {
if (focused) {
obs.focusGained(mWindowId.asBinder());
} else {
obs.focusLost(mWindowId.asBinder());
}
} catch (RemoteException e) {
}
}
mFocusCallbacks.finishBroadcast();
}
}
IWindow.aidl
/**
* API back to a client window that the Window Manager uses to inform it of
* interesting things happening.
*
* {@hide}
*/
oneway interface IWindow {
/**
* ===== NOTICE =====
* The first method must remain the first method. Scripts
* and tools rely on their transaction number to work properly.
*/
/**
* Invoked by the view server to tell a window to execute the specified
* command. Any response from the receiver must be sent through the
* specified file descriptor.
*/
void executeCommand(String command, String parameters, in ParcelFileDescriptor descriptor);
void resized(in Rect frame, in Rect overscanInsets, in Rect contentInsets,
in Rect visibleInsets, in Rect stableInsets, in Rect outsets, boolean reportDraw,
in MergedConfiguration newMergedConfiguration, in Rect backDropFrame,
boolean forceLayout, boolean alwaysConsumeNavBar, int displayId);
void moved(int newX, int newY);
void dispatchAppVisibility(boolean visible);
void dispatchGetNewSurface();
/**
* Tell the window that it is either gaining or losing focus. Keep it up
* to date on the current state showing navigational focus (touch mode) too.
*/
void windowFocusChanged(boolean hasFocus, boolean inTouchMode)
...
}
ViewRootImpl#W.java
static class W extends IWindow.Stub {
...
@Override
public void windowFocusChanged(boolean hasFocus, boolean inTouchMode) {
final ViewRootImpl viewAncestor = mViewAncestor.get();
if (viewAncestor != null) {
viewAncestor.windowFocusChanged(hasFocus, inTouchMode);
}
}
...
}
ViewRootImpl.java
public void windowFocusChanged(boolean hasFocus, boolean inTouchMode) {
Message msg = Message.obtain();
msg.what = MSG_WINDOW_FOCUS_CHANGED;
msg.arg1 = hasFocus ? 1 : 0;
msg.arg2 = inTouchMode ? 1 : 0;
mHandler.sendMessage(msg);
}
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
...
case MSG_WINDOW_FOCUS_CHANGED: {
if (mAdded) {
boolean hasWindowFocus = msg.arg1 != 0;
mAttachInfo.mHasWindowFocus = hasWindowFocus;
profileRendering(hasWindowFocus);
if (hasWindowFocus) {
boolean inTouchMode = msg.arg2 != 0;
ensureTouchModeLocally(inTouchMode);
if (mAttachInfo.mThreadedRenderer != null && mSurface.isValid()){
mFullRedrawNeeded = true;
try {
final WindowManager.LayoutParams lp = mWindowAttributes;
final Rect surfaceInsets = lp != null ? lp.surfaceInsets : null;
mAttachInfo.mThreadedRenderer.initializeIfNeeded(
mWidth, mHeight, mAttachInfo, mSurface, surfaceInsets);
} catch (OutOfResourcesException e) {
Log.e(mTag, "OutOfResourcesException locking surface", e);
try {
if (!mWindowSession.outOfMemory(mWindow)) {
Slog.w(mTag, "No processes killed for memory; killing self");
Process.killProcess(Process.myPid());
}
} catch (RemoteException ex) {
}
// Retry in a bit.
sendMessageDelayed(obtainMessage(msg.what, msg.arg1, msg.arg2), 500);
return;
}
}
}
mLastWasImTarget = WindowManager.LayoutParams
.mayUseInputMethod(mWindowAttributes.flags);
InputMethodManager imm = InputMethodManager.peekInstance();
if (imm != null && mLastWasImTarget && !isInLocalFocusMode()) {
imm.onPreWindowFocus(mView, hasWindowFocus);
}
if (mView != null) {
mAttachInfo.mKeyDispatchState.reset();
mView.dispatchWindowFocusChanged(hasWindowFocus);
mAttachInfo.mTreeObserver.dispatchOnWindowFocusChange(hasWindowFocus);
if (mAttachInfo.mTooltipHost != null) {
mAttachInfo.mTooltipHost.hideTooltip();
}
}
// Note: must be done after the focus change callbacks,
// so all of the view state is set up correctly.
if (hasWindowFocus) {
if (imm != null && mLastWasImTarget && !isInLocalFocusMode()) {
imm.onPostWindowFocus(mView, mView.findFocus(),
mWindowAttributes.softInputMode,
!mHasHadWindowFocus, mWindowAttributes.flags);
}
// Clear the forward bit. We can just do this directly, since
// the window manager doesn't care about it.
mWindowAttributes.softInputMode &=
~WindowManager.LayoutParams.SOFT_INPUT_IS_FORWARD_NAVIGATION;
((WindowManager.LayoutParams)mView.getLayoutParams())
.softInputMode &=
~WindowManager.LayoutParams.SOFT_INPUT_IS_FORWARD_NAVIGATION;
mHasHadWindowFocus = true;
} else {
if (mPointerCapture) {
handlePointerCaptureChanged(false);
}
}
}
} break;
...
}
}
mView.dispatchWindowFocusChanged(hasWindowFocus)
View.java
/**
* Called when the window containing this view gains or loses window focus.
* ViewGroups should override to route to their children.
*
* @param hasFocus True if the window containing this view now has focus,
* false otherwise.
*/
public void dispatchWindowFocusChanged(boolean hasFocus) {
onWindowFocusChanged(hasFocus);
}
DecorView.java
@Override
public void onWindowFocusChanged(boolean hasWindowFocus) {
super.onWindowFocusChanged(hasWindowFocus);
// If the user is chording a menu shortcut, release the chord since
// this window lost focus
if (mWindow.hasFeature(Window.FEATURE_OPTIONS_PANEL) && !hasWindowFocus
&& mWindow.mPanelChordingKey != 0) {
mWindow.closePanel(Window.FEATURE_OPTIONS_PANEL);
}
final Window.Callback cb = mWindow.getCallback();
if (cb != null && !mWindow.isDestroyed() && mFeatureId < 0) {
cb.onWindowFocusChanged(hasWindowFocus);
}
if (mPrimaryActionMode != null) {
mPrimaryActionMode.onWindowFocusChanged(hasWindowFocus);
}
if (mFloatingActionMode != null) {
mFloatingActionMode.onWindowFocusChanged(hasWindowFocus);
}
updateElevation();
}