input命令可以用来注入事件，代码在frameworks/base/cmds/input/src/com/android/commands/input/Input.java
注入点击等触碰事件时，在Android 10版本后还可以通过-d来指定displayId，这个对多屏手机具有测试参考作用。
InputManager的injectInputEvent方法最终调用到InputDispatcher::injectInputEvent
int32_t InputDispatcher::injectInputEvent(const InputEvent* event, int32_t displayId,
??????? int32_t injectorPid, int32_t injectorUid, int32_t syncMode, int32_t timeoutMillis,
??????? uint32_t policyFlags) {
enqueueInboundEventLocked(entry);
------? mInboundQueue.enqueueAtTail(entry);
这里调用到enqueueInboundEventLocked，屏幕的触碰事件也是调用到enqueueInboundEventLocked，是通过TouchInputMapper::dispatchMotion调用到的
void TouchInputMapper::dispatchMotion(nsecs_t when, uint32_t policyFlags, uint32_t source,
??????? int32_t action, int32_t flags, int32_t metaState, int32_t buttonState, int32_t edgeFlags,
??????? const PointerProperties* properties, const PointerCoords* coords,
??????? const uint32_t* idToIndex, BitSet32 idBits,
??????? int32_t changedId, float xPrecision, float yPrecision, nsecs_t downTime) {
??? NotifyMotionArgs args(when, getDeviceId(), source, policyFlags,
??????????? action, flags, metaState, buttonState, edgeFlags,
??????????? mViewport.displayId, pointerCount, pointerProperties, pointerCoords,
??????????? xPrecision, yPrecision, downTime);
??? getListener()->notifyMotion(&args);
}
void InputDispatcher::notifyMotion(const NotifyMotionArgs* args) {
…
??????? if (shouldSendMotionToInputFilterLocked(args)) {
??????????? mLock.unlock();
??????????? MotionEvent event;
??????????? event.initialize(args->deviceId, args->source, args->action, args->flags,
???? ???????????????args->edgeFlags, args->metaState, args->buttonState, 0, 0,
??????????????????? args->xPrecision, args->yPrecision,
??????????????????? args->downTime, args->eventTime,
??????????????????? args->pointerCount, args->pointerProperties, args->pointerCoords);
??????????? policyFlags |= POLICY_FLAG_FILTERED;
??????????? if (!mPolicy->filterInputEvent(&event, policyFlags)) {
??????????????? return; // event was consumed by the filter
??????????? }
??????????? mLock.lock();
??????? }
??????? // Just enqueue a new motion event.
??????? MotionEntry* newEntry = new MotionEntry(args->eventTime,
??????????????? args->deviceId, args->source, policyFlags,
??????????????? args->action, args->flags, args->metaState, args->buttonState,
???????? ???????args->edgeFlags, args->xPrecision, args->yPrecision, args->downTime,
??????????????? args->displayId,
??????????????? args->pointerCount, args->pointerProperties, args->pointerCoords, 0, 0);
??????? needWake = enqueueInboundEventLocked(newEntry);
??????? mLock.unlock();
??? } // release lock
都有enqueueInboundEventLocked调用，
enqueueInboundEventLocked会触发dispatchOnce中的调用
loop流程
bool InputDispatcherThread::threadLoop() {
??? mDispatcher->dispatchOnce();
??? return true;
}
void InputDispatcher::dispatchOnce()
有指令时调用
??????? if (!haveCommandsLocked()) {
??????????? dispatchOnceInnerLocked(&nextWakeupTime);
??????? }
bool InputDispatcher::haveCommandsLocked() const {
??? return !mCommandQueue.isEmpty();
}
dispatchOnceInnerLocked
void InputDispatcher::dispatchOnceInnerLocked(nsecs_t* nextWakeupTime) {
dispatchMotionLocked
event是从mPendingEvent里面获取的
bool InputDispatcher::dispatchMotionLocked(
??????? nsecs_t currentTime, MotionEntry* entry, DropReason* dropReason, nsecs_t* nextWakeupTime) {
findTouchedWindowTargetsLocked
获取 inputTargets
然后，dispatchEventLocked(currentTime, entry, inputTargets);
???
里面调用connect进行了分发
void InputDispatcher::dispatchEventLocked(nsecs_t currentTime,
??????? EventEntry* eventEntry, const Vector& inputTargets) {
#if DEBUG_DISPATCH_CYCLE
??? ALOGD("dispatchEventToCurrentInputTargets");
#endif
??? ALOG_ASSERT(eventEntry->dispatchInProgress); // should already have been set to true
??? pokeUserActivityLocked(eventEntry);
??? for (size_t i = 0; i < inputTargets.size(); i++) {
??????? const InputTarget& inputTarget = inputTargets.itemAt(i);
??????? ssize_t connectionIndex = getConnectionIndexLocked(inputTarget.inputChannel);
??????? if (connectionIndex >= 0) {
??????????? sp connection = mConnectionsByFd.valueAt(connectionIndex);
??????????? prepareDispatchCycleLocked(currentTime, connection, eventEntry, &inputTarget);
??????? } else {
#if DEBUG_FOCUS
??????????? ALOGD("Dropping event delivery to target with channel '%s' because it "
??????????????????? "is no longer registered with the input dispatcher.",
??????????????????? inputTarget.inputChannel->getName().string());
#endif
??????? }
??? }
}
参考资料
InputManagerService分析一：IMS的启动与事件传递