1.Android 4.0 用户输入子系统代码模块
frameworks/base/services/java/com/android/server/SystemServer.java
frameworks/base/services/java/com/android/server/wm/WindowManagerService.java
frameworks/base/services/java/com/android/server/wm/InputManager.java
frameworks/base/services/jni/com_android_server_InputManager.cpp
frameworks/base/services/input/Android.mk
frameworks/base/services/input/EventHub.cpp
frameworks/base/services/input/EventHub.h
frameworks/base/services/input/InputApplication.cpp
frameworks/base/services/input/InputDispatcher.cpp
frameworks/base/services/input/InputListener.cpp
frameworks/base/services/input/InputDispatcher.h
frameworks/base/services/input/InputListener.h
frameworks/base/services/input/InputManager.cpp
frameworks/base/services/input/InputManager.h
frameworks/base/services/input/InputReader.cpp
frameworks/base/services/input/InputReader.h
frameworks/base/services/input/InputWindow.cpp
frameworks/base/services/input/InputWindow.h
frameworks/base/services/input/PointerController.cpp
frameworks/base/services/input/PointerController.h
frameworks/base/services/input/SpriteController.cpp
frameworks/base/services/input/SpriteController.h
2.Service and WindowManagerService
Source code:frameworks/base/services/java/com/android/server/SystemServer.java
class ServerThread extends Thread {
private static final String TAG = "SystemServer";
/*。。。。。。。。。。处略过若干行。。。。。。。。。*/
Slog.i(TAG, "Window Manager");
wm = WindowManagerService.main(context, power,
factoryTest != SystemServer.FACTORY_TEST_LOW_LEVEL,
!firstBoot);
ServiceManager.addService(Context.WINDOW_SERVICE, wm);
ActivityManagerService.self().setWindowManager(wm);
}
功能描述：系统启动过程通过SystemServer添加WindowManagerService到服务列表
--WindowManagerService的构造方法
Source code:frameworks/base/services/java/com/android/server/wm/WindowManagerService.java
private WindowManagerService(Context context, PowerManagerService pm,
boolean haveInputMethods, boolean showBootMsgs) {
mInputManager = new InputManager(context, this);/*构造InputManager*/
PolicyThread thr = new PolicyThread(mPolicy, this, context, pm);
thr.start();
/*debug by Joyce*/
synchronized (thr) {
while (!thr.mRunning) {
try {
thr.wait();
} catch (InterruptedException e) {
}
}
}
mInputManager.start();/*启动InputManager*/
}
功能描述：1)初始化并构造一个InputManager实例mInputManager
2)开启InputManager(由InputManager本身start()方法实现)
--InputManager构造方法以及start()方法的实现
Source code:frameworks/base/services/java/com/android/server/wm/InputManager.java
public InputManager(Context context, WindowManagerService windowManagerService) {
this.mContext = context;
this.mWindowManagerService = windowManagerService;
this.mCallbacks = new Callbacks();
/*现在知道为何与WindowManagerService有关系了吧
*因为InputManager的各种需求
*/
/*获取Looper循环队列?说实话我已经忘记了,只不过还记得那一副经典的图*/
Looper looper = windowManagerService.mH.getLooper();
Slog.i(TAG, "Initializing input manager");
nativeInit(mContext, mCallbacks, looper.getQueue());/*初始化InputManager*/
}
/*debug by Joyce*/
public void start() {
Slog.i(TAG, "Hey Joyce Starting input manager");
nativeStart();/*启动InputManager的本地实现*/
}
}
功能描述：1)调用JNI本地框架中的nativeInit方法来初始化InputManager
2)调用JNI本地框架中的nativeStart方法来开启InputManager
3.JNI本地框架的实现
--com_android_server_InputManager中给上层InputManager所提供的两个本地AP的实现
------------------>A部分
Source code:frameworks/base/services/jni/com_android_server_InputManager.cpp
/*方法映射表*/
static JNINativeMethod gInputManagerMethods[] = {
/* name, signature, funcPtr */
{ "nativeInit", "(Landroid/content/Context;"
"Lcom/android/server/wm/InputManager$Callbacks;Landroid/os/MessageQueue;)V",
(void*) android_server_InputManager_nativeInit },
{ "nativeStart", "()V",
(void*) android_server_InputManager_nativeStart },
}
static void android_server_InputManager_nativeInit(JNIEnv* env, jclass clazz,
jobject contextObj, jobject callbacksObj, jobject messageQueueObj) {
if (gNativeInputManager == NULL) {/*首次调用肯定为NULL*/
sp<Looper> looper = android_os_MessageQueue_getLooper(env, messageQueueObj);
gNativeInputManager = new NativeInputManager(contextObj, callbacksObj, looper);
} else {
LOGE("Input manager already initialized.");
jniThrowRuntimeException(env, "Input manager already initialized.");
}
}
--NativeInputManager本地类的构造函数
NativeInputManager::NativeInputManager(jobject contextObj,
jobject callbacksObj, const sp<Looper>& looper) :
mLooper(looper) {
JNIEnv* env = jniEnv();
/*程序到这里就已经为我们创建一个inputdevice HAL 的实例了*/
sp<EventHub> eventHub = new EventHub();/*creat the EventHub 一系列的memset*/
/*并以eventHub为参数为我们创建了一个InputManager本地实例,注意这个InputManager
是上层InputManager的本地实现定义在InputManager.cpp中
*/
mInputManager = new InputManager(eventHub, this, this);
}
--InputManager构造函数的实现
Source code：frameworks/base/services/input/InputManager.cpp
InputManager::InputManager(
const sp<EventHubInterface>& eventHub,
const sp<InputReaderPolicyInterface>& readerPolicy,
const sp<InputDispatcherPolicyInterface>& dispatcherPolicy) {
mDispatcher = new InputDispatcher(dispatcherPolicy);
mReader = new InputReader(eventHub, readerPolicy, mDispatcher);
initialize();
}
功能描述：1)创建NativeInputManager对象并保存成gNativeInputManager,该变量马上就会被用到
2)创建NativeInputManager对象的同时创建EventHub对象，并将创建的EventHub对象mEventHub作为参数传递给InputManager
的构造函数创建InputManager对象mInputManager
3)构建InputManager的同时会为我们构建InputDispatcher和InputReader对象
4)好了其实到这里就已经进入了本地C++框架层了,先到此打住,把下面这个JNI方法先分析一番
------------------>B部分
static void android_server_InputManager_nativeStart(JNIEnv* env, jclass clazz) {
if (checkInputManagerUnitialized(env)) {
return;
}
status_t result = gNativeInputManager->getInputManager()->start();
if (result) {
jniThrowRuntimeException(env, "Input manager could not be started.");
}
}
功能描述：1)很简单直接调用上面初始化过程中创建的NativeInputManager对象mNativeInputManager去调用getInputManager()函数,该函数又刚好返回InputManager对象mInputManager了
2)再由mInputManager去调用它本身的start()方法来启动InputManager
3)从上面的这些方法可以得知在上层我们开启InputManager实质是开启了本地C++框架中的InputManager
4.C++Input框架的实现