1, 基本概念
PhoneWindowManager也是运行于systemserver线程中,在Event事件分发之前处理,比如电源键。Event事件分发后,仅有包含Activity的apk线程才可以处理,如果apk中没有activity但是想处理Event事件怎么办呢?可以在PhoneWindowManager做做文章了。
在SystemServer中,
inputManager = new InputManagerService(context);
wm = WindowManagerService.main(context, inputManager,
mFactoryTestMode != FactoryTest.FACTORY_TEST_LOW_LEVEL,
!mFirstBoot, mOnlyCore);
ServiceManager.addService(Context.WINDOW_SERVICE, wm);
ServiceManager.addService(Context.INPUT_SERVICE, inputManager);
mActivityManagerService.setWindowManager(wm);
inputManager.setWindowManagerCallbacks(wm.getInputMonitor()); // 消息分发之前的回调
inputManager.start();
InputManagerService的创建以及启动已经论述了,在此就不多说了。在
WindowManagerService中新建了PhoneWindowManager和InputMonitor,并且将设置为InputManagerService对象的回调对象。其实这2个类都和Event的处理有关,在Event分发之前进行处理,相当于截取,具体的细节就一层一层抽丝剥茧了。
PhoneWindowManager是没有对应的C/C++层代码了。
看下InputManagerService的setWindowManagerCallbacks方法,
public void setWindowManagerCallbacks(WindowManagerCallbacks callbacks) {
mWindowManagerCallbacks = callbacks;
}
因此, InputManagerService的变量mWindowManagerCallbacks指向InputMonitor对象。
2处理流程
InputDispatcher的notifyKey方法中,Event进队列之前,会调用interceptKeyBeforeQueueing方法,
mPolicy->interceptKeyBeforeQueueing(&event, /*byref*/ policyFlags);
mPolicy变量是什么呢?通过查找,是NativeInputManager对象,
void NativeInputManager::interceptKeyBeforeQueueing(const KeyEvent* keyEvent,
uint32_t& policyFlags) {
bool interactive = mInteractive.load();
if (interactive) {
policyFlags |= POLICY_FLAG_INTERACTIVE;
}
if ((policyFlags & POLICY_FLAG_TRUSTED)) {
nsecs_t when = keyEvent->getEventTime();
JNIEnv* env = jniEnv();
jobject keyEventObj = android_view_KeyEvent_fromNative(env, keyEvent);
jint wmActions;
if (keyEventObj) {
wmActions = env->CallIntMethod(mServiceObj,
gServiceClassInfo.interceptKeyBeforeQueueing,
keyEventObj, policyFlags);
if (checkAndClearExceptionFromCallback(env, "interceptKeyBeforeQueueing")) {
wmActions = 0;
}
android_view_KeyEvent_recycle(env, keyEventObj);
env->DeleteLocalRef(keyEventObj);
}
•••
}
在register_android_server_InputManager方法中,
int res = jniRegisterNativeMethods(env, "com/android/server/input/InputManagerService",
gInputManagerMethods, NELEM(gInputManagerMethods));
•••
GET_METHOD_ID(gServiceClassInfo.interceptKeyBeforeQueueing, clazz,
"interceptKeyBeforeQueueing", "(Landroid/view/KeyEvent;I)I");
很明显了,调用Java层InputManagerService的interceptKeyBeforeQueueing方法,后面就没有什么困难了,最后调用PhoneWindowManager的interceptKeyBeforeQueueing方法。
看下InputMonitor的方法,有一些也是同样的方法调用,关键是C/C++层的代码什么时候调用,觉得InputMonitor的主要目的还是解耦,防止PhoneWindowManager和InputManagerService太紧,
public void notifyLidSwitchChanged(long whenNanos, boolean lidOpen) {
mService.mPolicy.notifyLidSwitchChanged(whenNanos, lidOpen);
}
public void notifyCameraLensCoverSwitchChanged(long whenNanos, boolean lensCovered) {
mService.mPolicy.notifyCameraLensCoverSwitchChanged(whenNanos, lensCovered);
}
public int interceptKeyBeforeQueueing(KeyEvent event, int policyFlags) {
return mService.mPolicy.interceptKeyBeforeQueueing(event, policyFlags);
}
public int interceptMotionBeforeQueueingNonInteractive(long whenNanos, int policyFlags) {
return mService.mPolicy.interceptMotionBeforeQueueingNonInteractive(
whenNanos, policyFlags);
}
public long interceptKeyBeforeDispatching(
InputWindowHandle focus, KeyEvent event, int policyFlags) {
WindowState windowState = focus != null ? (WindowState) focus.windowState : null;
return mService.mPolicy.interceptKeyBeforeDispatching(windowState, event, policyFlags);
}
public KeyEvent dispatchUnhandledKey(
InputWindowHandle focus, KeyEvent event, int policyFlags) {
WindowState windowState = focus != null ? (WindowState) focus.windowState : null;
return mService.mPolicy.dispatchUnhandledKey(windowState, event, policyFlags);
}
public int getPointerLayer() {
return mService.mPolicy.windowTypeToLayerLw(WindowManager.LayoutParams.TYPE_POINTER)
* WindowManagerService.TYPE_LAYER_MULTIPLIER
+ WindowManagerService.TYPE_LAYER_OFFSET;
}
在InputDispatcher.cpp的中的Event入队列之后,dispatchKeyLocked方法中会调用doInterceptKeyBeforeDispatchingLockedInterruptible方法,然后调用NativeInputManager的interceptKeyBeforeDispatching方法,
nsecs_t delay = mPolicy->interceptKeyBeforeDispatching(commandEntry->inputWindowHandle,
&event, entry->policyFlags);
最后会调用PhoneWindowManager的interceptKeyBeforeDispatching方法。
所以,如果apk中没有acitivity但是想监听Event事件怎么办呢?
在PhoneWindowManager的interceptKeyBeforeQueueing或者interceptKeyBeforeDispatching方法中稍加处理就可以了。
相关推荐
博客 https://gudianxiaoshuo.blog.csdn.net/article/detail VUE 组件示例
博客https://blog.csdn.net/weixin_49457347/article/details/1236所需文件
busybox-1.32.0._tar__.bz2文件系统： https://blog.csdn.net/tan1666/article/details/123156383
https://jiejie.blog.csdn.net/article/details/82743945
用于：https://laoshifu.blog.csdn.net/article/details/138191428 springboot多层文件夹创建，包含了多层文件夹结构。但是还没有带入代码。
https://yydatav.blog.csdn.net/article/details/120705616 更多Java SpringBoot&Echarts版的数据可视化大屏源码： https://yydatav.blog.csdn.net/article/details/123652970 更多《工厂订单出入库信息管理系统》...
https://blog.csdn.net/a6661314/article/details/124358796的实验文件
weUI 入门教程:http://blog.csdn.net/libin_1/article/details/50734266
KITTI数据集可视化教程，教程：https://blog.csdn.net/cg129054036/article/details/119516704
接前两篇文章，[小学生python游戏编程3----拼图游戏-准备](https://blog.csdn.net/fqfq123456/article/details/127173684)，[小学生python游戏编程4----拼图游戏今天]...，上次写到可以打乱图片，拼成游戏界面，今天...
https://blog.csdn.net/zhang24360/article/details/83098575文章里面所介绍
来自博客http://blog.csdn.net/uq_jin/article/details/51484890的代码
顺序表：https://blog.csdn.net/HAIIAKU/article/details/119302855 单链表：https://blog.csdn.net/HAIIAKU/article/details/119303873 顺序栈：https://blog.csdn.net/HAIIAKU/article/details/119304169 冒泡排序...
Socket实战——UDP连接：https://blog.csdn.net/haoranhaoshi/article/details/86601468 Socket实战——TCP连接：https://blog.csdn.net/haoranhaoshi/article/details/86601522 Socket实战——查询数据库：...
安装步骤：https://blog.csdn.net/qq_53810245/article/details/123674836
文章链接：https://blog.csdn.net/Jeankyw/article/details/131890436?spm=1001.2014.3001.5502
Keil5 MDK的软件安装步骤：https://blog.csdn.net/qq_53810245/article/details/123674836
登录页面的图标 文章地址：https://blog.csdn.net/qq3892997/article/details/12
BP神经网络预测代码，可以直接运行。BP神经网络博客和代码参考地址：https://blog.csdn.net/qq_57971471/article/details/121766454
手写RPC框架 说明:https://blog.csdn.net/lan861698789/article/details/103837228