injectInputEvent 在Android上的调用过程

Android 2.3frameworks/base/core/java/android/app/Instrumentation.java:   public void sendPointerSync(MotionEvent event){IWindowManager.Stub.asInterface(ServiceManager.getService("window"))).injectPointerEvent(event, true)frameworks/base/services/java/com/android/server/WindowManagerService.java:  final InputManager mInputManager;public boolean injectPointerEvent(MotionEvent ev, boolean sync)final int result = mInputManager.injectInputEvent(newEvent, pid, uid,                sync ? InputManager.INPUT_EVENT_INJECTION_SYNC_WAIT_FOR_FINISH                        : InputManager.INPUT_EVENT_INJECTION_SYNC_WAIT_FOR_RESULT,                INJECTION_TIMEOUT_MILLIS);frameworks/base/services/java/com/android/server/InputManager.java:     public int injectInputEvent(InputEvent event, int injectorPid, int injectorUid, int syncMode, int timeoutMillis) {        if (event == null) {            throw new IllegalArgumentException("event must not be null");        }        if (injectorPid            throw new IllegalArgumentException("injectorPid and injectorUid must not be negative.");        }        if (timeoutMillis            throw new IllegalArgumentException("timeoutMillis must be positive");        }        return nativeInjectInputEvent(event, injectorPid, injectorUid, syncMode, timeoutMillis);    }frameworks/base/services/jni/com_android_server_InputManager.cpp:static jint android_server_InputManager_nativeInjectInputEvent(JNIEnv* env, jclass clazz,frameworks/base/services/jni/com_android_server_InputManager.cpp:    { "nativeInjectInputEvent", "(Landroid/view/InputEvent;IIII)I",return gNativeInputManager->getInputManager()->getDispatcher()->injectInputEvent(& motionEvent, injectorPid, injectorUid, syncMode, timeoutMillis);mInputManager = new InputManager(eventHub, this, this);Android 4.0:\frameworks\base\core\java\android\app\Instrumentation.javapublic void sendPointerSync(MotionEvent event) {        validateNotAppThread();        if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) == 0) {            event.setSource(InputDevice.SOURCE_TOUCHSCREEN);        }        InputManager.getInstance().injectInputEvent(event,                InputManager.INJECT_INPUT_EVENT_MODE_WAIT_FOR_FINISH);    }\frameworks\base\core\java\android\hardware\input\InputManager.javaprivate final IInputManager mIm; public boolean injectInputEvent(InputEvent event, int mode) {        if (event == null) {            throw new IllegalArgumentException("event must not be null");        }        if (mode != INJECT_INPUT_EVENT_MODE_ASYNC                && mode != INJECT_INPUT_EVENT_MODE_WAIT_FOR_FINISH                && mode != INJECT_INPUT_EVENT_MODE_WAIT_FOR_RESULT) {            throw new IllegalArgumentException("mode is invalid");        }        try {            return mIm.injectInputEvent(event, mode);        } catch (RemoteException ex) {            return false;        }    }\frameworks\base\services\java\com\android\server\input\InputManagerService.java public boolean injectInputEvent(InputEvent event, int mode) {        if (event == null) {            throw new IllegalArgumentException("event must not be null");        }        if (mode != InputManager.INJECT_INPUT_EVENT_MODE_ASYNC                && mode != InputManager.INJECT_INPUT_EVENT_MODE_WAIT_FOR_FINISH                && mode != InputManager.INJECT_INPUT_EVENT_MODE_WAIT_FOR_RESULT) {            throw new IllegalArgumentException("mode is invalid");        }        final int pid = Binder.getCallingPid();        final int uid = Binder.getCallingUid();        final long ident = Binder.clearCallingIdentity();        final int result;        try {            result = nativeInjectInputEvent(mPtr, event, pid, uid, mode,                    INJECTION_TIMEOUT_MILLIS, WindowManagerPolicy.FLAG_DISABLE_KEY_REPEAT);        } finally {            Binder.restoreCallingIdentity(ident);        }        switch (result) {            case INPUT_EVENT_INJECTION_PERMISSION_DENIED:                Slog.w(TAG, "Input event injection from pid " + pid + " permission denied.");                throw new SecurityException(                        "Injecting to another application requires INJECT_EVENTS permission");            case INPUT_EVENT_INJECTION_SUCCEEDED:                return true;            case INPUT_EVENT_INJECTION_TIMED_OUT:                Slog.w(TAG, "Input event injection from pid " + pid + " timed out.");                return false;            case INPUT_EVENT_INJECTION_FAILED:            default:                Slog.w(TAG, "Input event injection from pid " + pid + " failed.");                return false;        }    }Note：Inject event to Android system need system permission.