https://blog.csdn.net/chen364567628/article/details/103467399 （第一篇）
frameworks\native\services\inputflinger\dispatcher\InputDispatcher.cpp
frameworks\native\services\inputflinger\dispatcher\InputDispatcher.h
frameworks\native\include\android\input.h
frameworks\native\services\inputflinger\dispatcher\InputState.cpp
frameworks\native\services\inputflinger\dispatcher\InputState.h
frameworks\native\libs\input\InputTransport.cpp
sourcecode\frameworks\base\core\jni\android_view_InputEventReceiver.cpp
sourcecode\frameworks\base\core\java\android\view\InputEventReceiver.java
sourcecode\frameworks\base\core\java\android\view\ViewRootImpl.java
sourcecode\frameworks\base\core\java\android\view\View.java
frameworks\base\core\java\android\view\ViewGroup.java
通過消息機制最終觸發
int NativeInputEventReceiver::handleEvent(int receiveFd, int events, void* data) {
if (events & (ALOOPER_EVENT_ERROR | ALOOPER_EVENT_HANGUP)) {
// This error typically occurs when the publisher has closed the input channel
// as part of removing a window or finishing an IME session, in which case
// the consumer will soon be disposed as well.
if (kDebugDispatchCycle) {
ALOGD("channel '%s' ~ Publisher closed input channel or an error occurred. "
"events=0x%x", getInputChannelName().c_str(), events);
}
return 0; // remove the callback
}
if (events & ALOOPER_EVENT_INPUT) {
JNIEnv* env = AndroidRuntime::getJNIEnv();
status_t status = consumeEvents(env, false /*consumeBatches*/, -1, NULL);
mMessageQueue->raiseAndClearException(env, "handleReceiveCallback");
return status == OK || status == NO_MEMORY ? 1 : 0;
}
if (events & ALOOPER_EVENT_OUTPUT) {
for (size_t i = 0; i < mFinishQueue.size(); i++) {
const Finish& finish = mFinishQueue.itemAt(i);
status_t status = mInputConsumer.sendFinishedSignal(finish.seq, finish.handled);
if (status) {
mFinishQueue.removeItemsAt(0, i);
if (status == WOULD_BLOCK) {
if (kDebugDispatchCycle) {
ALOGD("channel '%s' ~ Sent %zu queued finish events; %zu left.",
getInputChannelName().c_str(), i, mFinishQueue.size());
}
return 1; // keep the callback, try again later
}
ALOGW("Failed to send finished signal on channel '%s'. status=%d",
getInputChannelName().c_str(), status);
if (status != DEAD_OBJECT) {
JNIEnv* env = AndroidRuntime::getJNIEnv();
String8 message;
message.appendFormat("Failed to finish input event. status=%d", status);
jniThrowRuntimeException(env, message.string());
mMessageQueue->raiseAndClearException(env, "finishInputEvent");
}
return 0; // remove the callback
}
}
if (kDebugDispatchCycle) {
ALOGD("channel '%s' ~ Sent %zu queued finish events; none left.",
getInputChannelName().c_str(), mFinishQueue.size());
}
mFinishQueue.clear();
setFdEvents(ALOOPER_EVENT_INPUT);
return 1;
}
ALOGW("channel '%s' ~ Received spurious callback for unhandled poll event. "
"events=0x%x", getInputChannelName().c_str(), events);
return 1;
}
status_t NativeInputEventReceiver::consumeEvents(JNIEnv* env,
bool consumeBatches, nsecs_t frameTime, bool* outConsumedBatch) {
if (kDebugDispatchCycle) {
ALOGD("channel '%s' ~ Consuming input events, consumeBatches=%s, frameTime=%" PRId64,
getInputChannelName().c_str(),
consumeBatches ? "true" : "false", frameTime);
}
if (consumeBatches) {
mBatchedInputEventPending = false;
}
if (outConsumedBatch) {
*outConsumedBatch = false;
}
ScopedLocalRef<jobject> receiverObj(env, NULL);
bool skipCallbacks = false;
for (;;) {
uint32_t seq;
InputEvent* inputEvent;
status_t status = mInputConsumer.consume(&mInputEventFactory,
consumeBatches, frameTime, &seq, &inputEvent);
if (status) {
if (status == WOULD_BLOCK) {
if (!skipCallbacks && !mBatchedInputEventPending
&& mInputConsumer.hasPendingBatch()) {
// There is a pending batch. Come back later.
if (!receiverObj.get()) {
receiverObj.reset(jniGetReferent(env, mReceiverWeakGlobal));
if (!receiverObj.get()) {
ALOGW("channel '%s' ~ Receiver object was finalized "
"without being disposed.", getInputChannelName().c_str());
return DEAD_OBJECT;
}
}
mBatchedInputEventPending = true;
if (kDebugDispatchCycle) {
ALOGD("channel '%s' ~ Dispatching batched input event pending notification.",
getInputChannelName().c_str());
}
env->CallVoidMethod(receiverObj.get(),
gInputEventReceiverClassInfo.dispatchBatchedInputEventPending);
if (env->ExceptionCheck()) {
ALOGE("Exception dispatching batched input events.");
mBatchedInputEventPending = false; // try again later
}
}
return OK;
}
ALOGE("channel '%s' ~ Failed to consume input event. status=%d",
getInputChannelName().c_str(), status);
return status;
}
assert(inputEvent);
if (!skipCallbacks) {
if (!receiverObj.get()) {
receiverObj.reset(jniGetReferent(env, mReceiverWeakGlobal));
if (!receiverObj.get()) {
ALOGW("channel '%s' ~ Receiver object was finalized "
"without being disposed.", getInputChannelName().c_str());
return DEAD_OBJECT;
}
}
jobject inputEventObj;
switch (inputEvent->getType()) {
case AINPUT_EVENT_TYPE_KEY:
if (kDebugDispatchCycle) {
ALOGD("channel '%s' ~ Received key event.", getInputChannelName().c_str());
}
inputEventObj = android_view_KeyEvent_fromNative(env,
static_cast<KeyEvent*>(inputEvent));
break;
case AINPUT_EVENT_TYPE_MOTION: {
if (kDebugDispatchCycle) {
ALOGD("channel '%s' ~ Received motion event.", getInputChannelName().c_str());
}
MotionEvent* motionEvent = static_cast<MotionEvent*>(inputEvent);
if ((motionEvent->getAction() & AMOTION_EVENT_ACTION_MOVE) && outConsumedBatch) {
*outConsumedBatch = true;
}
inputEventObj = android_view_MotionEvent_obtainAsCopy(env, motionEvent);
break;
}
default:
assert(false); // InputConsumer should prevent this from ever happening
inputEventObj = NULL;
}
if (inputEventObj) {
if (kDebugDispatchCycle) {
ALOGD("channel '%s' ~ Dispatching input event.", getInputChannelName().c_str());
}
env->CallVoidMethod(receiverObj.get(),
gInputEventReceiverClassInfo.dispatchInputEvent, seq, inputEventObj);
if (env->ExceptionCheck()) {
ALOGE("Exception dispatching input event.");
skipCallbacks = true;
}
env->DeleteLocalRef(inputEventObj);
} else {
ALOGW("channel '%s' ~ Failed to obtain event object.",
getInputChannelName().c_str());
skipCallbacks = true;
}
}
if (skipCallbacks) {
mInputConsumer.sendFinishedSignal(seq, false);
}
}
}
status_t NativeInputEventReceiver::consumeEvents(JNIEnv* env,
bool consumeBatches, nsecs_t frameTime, bool* outConsumedBatch) {
if (kDebugDispatchCycle) {
ALOGD("channel '%s' ~ Consuming input events, consumeBatches=%s, frameTime=%" PRId64,
getInputChannelName().c_str(),
consumeBatches ? "true" : "false", frameTime);
}
if (consumeBatches) {
mBatchedInputEventPending = false;
}
if (outConsumedBatch) {
*outConsumedBatch = false;
}
ScopedLocalRef<jobject> receiverObj(env, NULL);
bool skipCallbacks = false;
for (;;) {
uint32_t seq;
InputEvent* inputEvent;
status_t status = mInputConsumer.consume(&mInputEventFactory,
consumeBatches, frameTime, &seq, &inputEvent);
if (status) {
if (status == WOULD_BLOCK) {
if (!skipCallbacks && !mBatchedInputEventPending
&& mInputConsumer.hasPendingBatch()) {
// There is a pending batch. Come back later.
if (!receiverObj.get()) {
receiverObj.reset(jniGetReferent(env, mReceiverWeakGlobal));
if (!receiverObj.get()) {
ALOGW("channel '%s' ~ Receiver object was finalized "
"without being disposed.", getInputChannelName().c_str());
return DEAD_OBJECT;
}
}
mBatchedInputEventPending = true;
if (kDebugDispatchCycle) {
ALOGD("channel '%s' ~ Dispatching batched input event pending notification.",
getInputChannelName().c_str());
}
env->CallVoidMethod(receiverObj.get(),
gInputEventReceiverClassInfo.dispatchBatchedInputEventPending);
if (env->ExceptionCheck()) {
ALOGE("Exception dispatching batched input events.");
mBatchedInputEventPending = false; // try again later
}
}
return OK;
}
ALOGE("channel '%s' ~ Failed to consume input event. status=%d",
getInputChannelName().c_str(), status);
return status;
}
assert(inputEvent);
if (!skipCallbacks) {
if (!receiverObj.get()) {
receiverObj.reset(jniGetReferent(env, mReceiverWeakGlobal));
if (!receiverObj.get()) {
ALOGW("channel '%s' ~ Receiver object was finalized "
"without being disposed.", getInputChannelName().c_str());
return DEAD_OBJECT;
}
}
jobject inputEventObj;
switch (inputEvent->getType()) {
case AINPUT_EVENT_TYPE_KEY:
if (kDebugDispatchCycle) {
ALOGD("channel '%s' ~ Received key event.", getInputChannelName().c_str());
}
inputEventObj = android_view_KeyEvent_fromNative(env,
static_cast<KeyEvent*>(inputEvent));
break;
case AINPUT_EVENT_TYPE_MOTION: {
if (kDebugDispatchCycle) {
ALOGD("channel '%s' ~ Received motion event.", getInputChannelName().c_str());
}
MotionEvent* motionEvent = static_cast<MotionEvent*>(inputEvent);
if ((motionEvent->getAction() & AMOTION_EVENT_ACTION_MOVE) && outConsumedBatch) {
*outConsumedBatch = true;
}
inputEventObj = android_view_MotionEvent_obtainAsCopy(env, motionEvent);
break;
}
default:
assert(false); // InputConsumer should prevent this from ever happening
inputEventObj = NULL;
}
if (inputEventObj) {
if (kDebugDispatchCycle) {
ALOGD("channel '%s' ~ Dispatching input event.", getInputChannelName().c_str());
}
env->CallVoidMethod(receiverObj.get(),
gInputEventReceiverClassInfo.dispatchInputEvent, seq, inputEventObj);
if (env->ExceptionCheck()) {
ALOGE("Exception dispatching input event.");
skipCallbacks = true;
}
env->DeleteLocalRef(inputEventObj);
} else {
ALOGW("channel '%s' ~ Failed to obtain event object.",
getInputChannelName().c_str());
skipCallbacks = true;
}
}
if (skipCallbacks) {
mInputConsumer.sendFinishedSignal(seq, false);
}
}
}
// Called from native code.
@SuppressWarnings("unused")
@UnsupportedAppUsage
private void dispatchInputEvent(int seq, InputEvent event) {
mSeqMap.put(event.getSequenceNumber(), seq);
onInputEvent(event);
}
/**
* Finishes an input event and indicates whether it was handled.
* Must be called on the same Looper thread to which the receiver is attached.
*
* @param event The input event that was finished.
* @param handled True if the event was handled.
*/
public final void finishInputEvent(InputEvent event, boolean handled) {
if (event == null) {
throw new IllegalArgumentException("event must not be null");
}
if (mReceiverPtr == 0) {
Log.w(TAG, "Attempted to finish an input event but the input event "
+ "receiver has already been disposed.");
} else {
int index = mSeqMap.indexOfKey(event.getSequenceNumber());
if (index < 0) {
Log.w(TAG, "Attempted to finish an input event that is not in progress.");
} else {
int seq = mSeqMap.valueAt(index);
mSeqMap.removeAt(index);
nativeFinishInputEvent(mReceiverPtr, seq, handled);
}
}
event.recycleIfNeededAfterDispatch();
}
static void nativeFinishInputEvent(JNIEnv* env, jclass clazz, jlong receiverPtr,
jint seq, jboolean handled) {
sp<NativeInputEventReceiver> receiver =
reinterpret_cast<NativeInputEventReceiver*>(receiverPtr);
status_t status = receiver->finishInputEvent(seq, handled);
if (status && status != DEAD_OBJECT) {
String8 message;
message.appendFormat("Failed to finish input event. status=%d", status);
jniThrowRuntimeException(env, message.string());
}
}
status_t NativeInputEventReceiver::finishInputEvent(uint32_t seq, bool handled) {
if (kDebugDispatchCycle) {
ALOGD("channel '%s' ~ Finished input event.", getInputChannelName().c_str());
}
status_t status = mInputConsumer.sendFinishedSignal(seq, handled);
if (status) {
if (status == WOULD_BLOCK) {
if (kDebugDispatchCycle) {
ALOGD("channel '%s' ~ Could not send finished signal immediately. "
"Enqueued for later.", getInputChannelName().c_str());
}
Finish finish;
finish.seq = seq;
finish.handled = handled;
mFinishQueue.add(finish);
if (mFinishQueue.size() == 1) {
setFdEvents(ALOOPER_EVENT_INPUT | ALOOPER_EVENT_OUTPUT);
}
return OK;
}
ALOGW("Failed to send finished signal on channel '%s'. status=%d",
getInputChannelName().c_str(), status);
}
return status;
}
final class WindowInputEventReceiver extends InputEventReceiver {
public WindowInputEventReceiver(InputChannel inputChannel, Looper looper) {
super(inputChannel, looper);
}
@Override
public void onInputEvent(InputEvent event) {
Trace.traceBegin(Trace.TRACE_TAG_VIEW, "processInputEventForCompatibility");
List<InputEvent> processedEvents;
try {
processedEvents =
mInputCompatProcessor.processInputEventForCompatibility(event);
} finally {
Trace.traceEnd(Trace.TRACE_TAG_VIEW);
}
if (processedEvents != null) {
if (processedEvents.isEmpty()) {
// InputEvent consumed by mInputCompatProcessor
finishInputEvent(event, true);
} else {
for (int i = 0; i < processedEvents.size(); i++) {
enqueueInputEvent(
processedEvents.get(i), this,
QueuedInputEvent.FLAG_MODIFIED_FOR_COMPATIBILITY, true);
}
}
} else {
enqueueInputEvent(event, this, 0, true);
}
}
@Override
public void onBatchedInputEventPending() {
if (mUnbufferedInputDispatch) {
super.onBatchedInputEventPending();
} else {
scheduleConsumeBatchedInput();
}
}
@Override
public void dispose() {
unscheduleConsumeBatchedInput();
super.dispose();
}
}
@UnsupportedAppUsage
void enqueueInputEvent(InputEvent event) {
enqueueInputEvent(event, null, 0, false);
}
@UnsupportedAppUsage
void enqueueInputEvent(InputEvent event,
InputEventReceiver receiver, int flags, boolean processImmediately) {
QueuedInputEvent q = obtainQueuedInputEvent(event, receiver, flags);
// Always enqueue the input event in order, regardless of its time stamp.
// We do this because the application or the IME may inject key events
// in response to touch events and we want to ensure that the injected keys
// are processed in the order they were received and we cannot trust that
// the time stamp of injected events are monotonic.
QueuedInputEvent last = mPendingInputEventTail;
if (last == null) {
mPendingInputEventHead = q;
mPendingInputEventTail = q;
} else {
last.mNext = q;
mPendingInputEventTail = q;
}
mPendingInputEventCount += 1;
Trace.traceCounter(Trace.TRACE_TAG_INPUT, mPendingInputEventQueueLengthCounterName,
mPendingInputEventCount);
if (processImmediately) {
doProcessInputEvents();
} else {
scheduleProcessInputEvents();
}
}
private void scheduleProcessInputEvents() {
if (!mProcessInputEventsScheduled) {
mProcessInputEventsScheduled = true;
Message msg = mHandler.obtainMessage(MSG_PROCESS_INPUT_EVENTS);
msg.setAsynchronous(true);
mHandler.sendMessage(msg);
}
}
void doProcessInputEvents() {
// Deliver all pending input events in the queue.
while (mPendingInputEventHead != null) {
QueuedInputEvent q = mPendingInputEventHead;
mPendingInputEventHead = q.mNext;
if (mPendingInputEventHead == null) {
mPendingInputEventTail = null;
}
q.mNext = null;
mPendingInputEventCount -= 1;
Trace.traceCounter(Trace.TRACE_TAG_INPUT, mPendingInputEventQueueLengthCounterName,
mPendingInputEventCount);
long eventTime = q.mEvent.getEventTimeNano();
long oldestEventTime = eventTime;
if (q.mEvent instanceof MotionEvent) {
MotionEvent me = (MotionEvent)q.mEvent;
if (me.getHistorySize() > 0) {
oldestEventTime = me.getHistoricalEventTimeNano(0);
}
}
mChoreographer.mFrameInfo.updateInputEventTime(eventTime, oldestEventTime);
deliverInputEvent(q);
}
// We are done processing all input events that we can process right now
// so we can clear the pending flag immediately.
if (mProcessInputEventsScheduled) {
mProcessInputEventsScheduled = false;
mHandler.removeMessages(MSG_PROCESS_INPUT_EVENTS);
}
}
private void deliverInputEvent(QueuedInputEvent q) {
Trace.asyncTraceBegin(Trace.TRACE_TAG_VIEW, "deliverInputEvent",
q.mEvent.getSequenceNumber());
if (mInputEventConsistencyVerifier != null) {
mInputEventConsistencyVerifier.onInputEvent(q.mEvent, 0);
}
InputStage stage;
if (q.shouldSendToSynthesizer()) {
stage = mSyntheticInputStage;
} else {
stage = q.shouldSkipIme() ? mFirstPostImeInputStage : mFirstInputStage;
}
if (q.mEvent instanceof KeyEvent) {
mUnhandledKeyManager.preDispatch((KeyEvent) q.mEvent);
}
if (stage != null) {
handleWindowFocusChanged();
stage.deliver(q);
} else {
finishInputEvent(q);
}
}
/**
* Delivers an event to be processed.
*/
public final void deliver(QueuedInputEvent q) {
if ((q.mFlags & QueuedInputEvent.FLAG_FINISHED) != 0) {
forward(q);
} else if (shouldDropInputEvent(q)) {
finish(q, false);
} else {
apply(q, onProcess(q));
}
}
* Delivers post-ime input events to the view hierarchy.
*/
final class ViewPostImeInputStage extends InputStage {
public ViewPostImeInputStage(InputStage next) {
super(next);
}
@Override
protected int onProcess(QueuedInputEvent q) {
if (q.mEvent instanceof KeyEvent) {
return processKeyEvent(q);
} else {
final int source = q.mEvent.getSource();
if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) {
return processPointerEvent(q);
} else if ((source & InputDevice.SOURCE_CLASS_TRACKBALL) != 0) {
return processTrackballEvent(q);
} else {
return processGenericMotionEvent(q);
}
}
}
private int processPointerEvent(QueuedInputEvent q) {
final MotionEvent event = (MotionEvent)q.mEvent;
mAttachInfo.mUnbufferedDispatchRequested = false;
mAttachInfo.mHandlingPointerEvent = true;
boolean handled = mView.dispatchPointerEvent(event);
maybeUpdatePointerIcon(event);
maybeUpdateTooltip(event);
mAttachInfo.mHandlingPointerEvent = false;
if (mAttachInfo.mUnbufferedDispatchRequested && !mUnbufferedInputDispatch) {
mUnbufferedInputDispatch = true;
if (mConsumeBatchedInputScheduled) {
scheduleConsumeBatchedInputImmediately();
}
}
return handled ? FINISH_HANDLED : FORWARD;
}
@UnsupportedAppUsage
public final boolean dispatchPointerEvent(MotionEvent event) {
if (event.isTouchEvent()) {
return dispatchTouchEvent(event);
} else {
return dispatchGenericMotionEvent(event);
}
}
*/
public boolean dispatchTouchEvent(MotionEvent event) {
// If the event should be handled by accessibility focus first.
if (event.isTargetAccessibilityFocus()) {
// We don't have focus or no virtual descendant has it, do not handle the event.
if (!isAccessibilityFocusedViewOrHost()) {
return false;
}
// We have focus and got the event, then use normal event dispatch.
event.setTargetAccessibilityFocus(false);
}
boolean result = false;
if (mInputEventConsistencyVerifier != null) {
mInputEventConsistencyVerifier.onTouchEvent(event, 0);
}
final int actionMasked = event.getActionMasked();
if (actionMasked == MotionEvent.ACTION_DOWN) {
// Defensive cleanup for new gesture
stopNestedScroll();
}
if (onFilterTouchEventForSecurity(event)) {
if ((mViewFlags & ENABLED_MASK) == ENABLED && handleScrollBarDragging(event)) {
result = true;
}
//noinspection SimplifiableIfStatement
ListenerInfo li = mListenerInfo;
if (li != null && li.mOnTouchListener != null
&& (mViewFlags & ENABLED_MASK) == ENABLED
&& li.mOnTouchListener.onTouch(this, event)) {
result = true;
}
if (!result && onTouchEvent(event)) {
result = true;
}
}
if (!result && mInputEventConsistencyVerifier != null) {
mInputEventConsistencyVerifier.onUnhandledEvent(event, 0);
}
// Clean up after nested scrolls if this is the end of a gesture;
// also cancel it if we tried an ACTION_DOWN but we didn't want the rest
// of the gesture.
if (actionMasked == MotionEvent.ACTION_UP ||
actionMasked == MotionEvent.ACTION_CANCEL ||
(actionMasked == MotionEvent.ACTION_DOWN && !result)) {
stopNestedScroll();
}
return result;
}