代码实现添加悬浮窗
mWindowManager = (WindowManager) getApplication().getSystemService(getApplication().WINDOW_SERVICE);
mWindowView = LayoutInflater.from(getApplication()).inflate(R.layout.layout_window, null);
mWindowManager.addView(mWindowView, wmParams);
分析的源码为：android 8.0 api26
关键代码：WindowManager.addView()
源码位置：android.view.WindowManagerImpl#addView
@Override
public void addView(@NonNull View view, @NonNull ViewGroup.LayoutParams params) {
applyDefaultToken(params);
mGlobal.addView(view, params, mContext.getDisplay(), mParentWindow);
}
关键代码：mGlobal.addView(）
源码位置：android.view.WindowManagerGlobal#addView
public void addView(View view, ViewGroup.LayoutParams params,
Display display, Window parentWindow) {
// 参数效验
...
ViewRootImpl root;
synchronized (mLock) {
// 查找缓存，类型效验
...
root = new ViewRootImpl(view.getContext(), display);
view.setLayoutParams(wparams);
mViews.add(view);
mRoots.add(root);
mParams.add(wparams);
}
try {
root.setView(view, wparams, panelParentView);
} catch (RuntimeException e) {
// who care?
}
}
关键代码：root.setView(...）
源码位置：android.view.ViewRootImpl#setView
public void setView(View view, WindowManager.LayoutParams attrs, View panelParentView) {
synchronized (this) {
// 各种属性读取，赋值及效验
...
mView = view;
mWindowAttributes.copyFrom(attrs);
...
mAttachInfo.mRootView = view;
try {
...
//1-进行View绘制三大流程；
requestLayout();
...
int res; /* = WindowManagerImpl.ADD_OKAY; */
//2-会通过WindowSession完成Window的添加过程(一次IPC调用)
res = mWindowSession.addToDisplay(mWindow, mSeq, mWindowAttributes,
getHostVisibility(), mDisplay.getDisplayId(),
mAttachInfo.mContentInsets, mAttachInfo.mStableInsets,
mAttachInfo.mOutsets, mInputChannel);
} catch (RemoteException e) {
...
}
}
关键代码 mWindowAttributes#copyFrom()分析
源码位置：android.view.WindowManager.LayoutParams#copyFrom
public final int copyFrom(LayoutParams o) {
int changes = 0;
//各种属性赋值
...
// This can't change, it's only set at window creation time.
hideTimeoutMilliseconds = o.hideTimeoutMilliseconds;//默认值为-1
return changes;
}
关键代码：mWindowSession.addToDisplay(...)
1.获取Session对象
2.调用Session的方法addToDisplay()
1.获取Session
mWindowSession = WindowManagerGlobal.getWindowSession();
源码位置：android.view.WindowManagerGlobal#getWindowSession
public static IWindowSession getWindowSession() {
synchronized (WindowManagerGlobal.class) {
if (sWindowSession == null) {
try {
InputMethodManager imm = InputMethodManager.getInstance();
IWindowManager windowManager = getWindowManagerService();
sWindowSession = windowManager.openSession(
new IWindowSessionCallback.Stub() {
@Override
public void onAnimatorScaleChanged(float scale) {
ValueAnimator.setDurationScale(scale);
}
},
imm.getClient(), imm.getInputContext());
} catch (RemoteException e) {
throw e.rethrowFromSystemServer();
}
}
return sWindowSession;
}
}
关键代码：windowManager.openSession(...)
源码位置：com.android.server.wm.WindowManagerService#openSession
public IWindowSession openSession(IWindowSessionCallback callback, IInputMethodClient client,
IInputContext inputContext) {
if (client == null) throw new IllegalArgumentException("null client");
if (inputContext == null) throw new IllegalArgumentException("null inputContext");
Session session = new Session(this, callback, client, inputContext);
return session;
}
第一步获取Session对象完成
2.调用Session的方法addToDisplay()
源码位置：com.android.server.wm.Session#addToDisplay
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);
}
关键代码：mService.addWindow(...)
源码位置：com.android.server.wm.WindowManagerService#addWindow
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;
}
...
final int type = attrs.type;
synchronized(mWindowMap) {
//各种条件判断
...
WindowToken token = displayContent.getWindowToken(
hasParent ? parentWindow.mAttrs.token : attrs.token);
final int rootType = hasParent ? parentWindow.mAttrs.type : type;
boolean addToastWindowRequiresToken = false;
if (token == null) {
//rooType判断符合某些type， 则返回
if (type == TYPE_TOAST) {
// android版本>=26(andorid 8.0)
if (doesAddToastWindowRequireToken(attrs.packageName, callingUid,
parentWindow)) {
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 (type == TYPE_TOAST) {
// android版本>=26(andorid 8.0)
addToastWindowRequiresToken = doesAddToastWindowRequireToken(attrs.packageName,
callingUid, parentWindow);
if (addToastWindowRequiresToken && token.windowType != TYPE_TOAST) {
return WindowManagerGlobal.ADD_BAD_APP_TOKEN;
}
}
...
final WindowState win = new WindowState(this, session, client, token, parentWindow,
appOp[0], seq, attrs, viewVisibility, session.mUid,
session.mCanAddInternalSystemWindow);
...
mPolicy.adjustWindowParamsLw(win.mAttrs);
...
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;
}
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);
}
}
...
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);
}
}
...
return res;
}
源码位置：com.android.server.policy.PhoneWindowManager#checkAddPermission
/** {@inheritDoc} */
@Override
public int checkAddPermission(WindowManager.LayoutParams attrs, int[] outAppOp) {
int type = attrs.type;
outAppOp[0] = AppOpsManager.OP_NONE;
if (!isSystemAlertWindowType(type)) {
switch (type) {
case TYPE_TOAST:
// Only apps that target older than O SDK can add window without a token, after
// that we require a token so apps cannot add toasts directly as the token is
// added by the notification system.
// Window manager does the checking for this.
outAppOp[0] = OP_TOAST_WINDOW;
return ADD_OKAY;
case TYPE_DREAM:
case TYPE_INPUT_METHOD:
case TYPE_WALLPAPER:
case TYPE_PRESENTATION:
case TYPE_PRIVATE_PRESENTATION:
case TYPE_VOICE_INTERACTION:
case TYPE_ACCESSIBILITY_OVERLAY:
case TYPE_QS_DIALOG:
// The window manager will check these.
return ADD_OKAY;
}
return mContext.checkCallingOrSelfPermission(INTERNAL_SYSTEM_WINDOW)
== PERMISSION_GRANTED ? ADD_OKAY : ADD_PERMISSION_DENIED;
}
}
源码位置：com.android.server.policy.PhoneWindowManager#adjustWindowParamsLw
public void adjustWindowParamsLw(WindowManager.LayoutParams attrs) {
switch (attrs.type) {
...
case TYPE_TOAST:
// While apps should use the dedicated toast APIs to add such windows
// it possible legacy apps to add the window directly. Therefore, we
// make windows added directly by the app behave as a toast as much
// as possible in terms of timeout and animation.
if (attrs.hideTimeoutMilliseconds < 0
|| attrs.hideTimeoutMilliseconds > TOAST_WINDOW_TIMEOUT) {
attrs.hideTimeoutMilliseconds = TOAST_WINDOW_TIMEOUT;
}
attrs.windowAnimations = com.android.internal.R.style.Animation_Toast;
break;
}
...
}