Input系统学习-----injectInputEvent注入事件调用流程
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
InputManagerService分析一：IMS的启动与事件传递_李炼的博客-CSDN博客