作者facing (facing)
看板AndroidDev
標題Re: [問題] Touch 座標
時間Sun Mar 18 17:18:37 2012
你是想自己讀取坐標上報給應用嗎？如果是的話可以參考framework里的InputRead。在
frameworks/base/libs/ui/目錄下。其中InputReader.cpp 的loopOnce就是讀取一次設
備事件（touch,keyboard等），通過EventHub.cpp里的getEvent的read/poll實現。
void InputReader::loopOnce() {
RawEvent rawEvent;
mEventHub->getEvent(& rawEvent);
。。。。。。。
}
--------EventHub.cpp--------------
bool EventHub::getEvent(RawEvent* outEvent)
{
outEvent->deviceId = 0;
outEvent->type = 0;
outEvent->scanCode = 0;
outEvent->keyCode = 0;
outEvent->flags = 0;
outEvent->value = 0;
outEvent->when = 0;
// Note that we only allow one caller to getEvent(), so don't need
// to do locking here... only when adding/removing devices.
if (!mOpened) {
mError = openPlatformInput() ? NO_ERROR : UNKNOWN_ERROR;
mOpened = true;
mNeedToSendFinishedDeviceScan = true;
}
for (;;) {
// Report any devices that had last been added/removed.
if (mClosingDevices != NULL) {
device_t* device = mClosingDevices;
LOGV("Reporting device closed: id=0x%x, name=%s\n",
device->id, device->path.string());
mClosingDevices = device->next;
if (device->id == mFirstKeyboardId) {
outEvent->deviceId = 0;
} else {
outEvent->deviceId = device->id;
}
outEvent->type = DEVICE_REMOVED;
outEvent->when = systemTime(SYSTEM_TIME_MONOTONIC);
delete device;
mNeedToSendFinishedDeviceScan = true;
return true;
}
if (mOpeningDevices != NULL) {
device_t* device = mOpeningDevices;
LOGV("Reporting device opened: id=0x%x, name=%s\n",
device->id, device->path.string());
mOpeningDevices = device->next;
if (device->id == mFirstKeyboardId) {
outEvent->deviceId = 0;
} else {
outEvent->deviceId = device->id;
}
outEvent->type = DEVICE_ADDED;
outEvent->when = systemTime(SYSTEM_TIME_MONOTONIC);
mNeedToSendFinishedDeviceScan = true;
return true;
}
if (mNeedToSendFinishedDeviceScan) {
mNeedToSendFinishedDeviceScan = false;
outEvent->type = FINISHED_DEVICE_SCAN;
outEvent->when = systemTime(SYSTEM_TIME_MONOTONIC);
return true;
}
// Grab the next input event.
for (;;) {
// Consume buffered input events, if any.
if (mInputBufferIndex < mInputBufferCount) {
const struct input_event& iev = mInputBufferData[mInputBuffe
rIndex++];
const device_t* device = mDevices[mInputDeviceIndex];
LOGV("%s got: t0=%d, t1=%d, type=%d, code=%d, v=%d", device-
>path.string(),
(int) iev.time.tv_sec, (int) iev.time.tv_usec, iev.type
, iev.code, iev.value);
if (device->id == mFirstKeyboardId) {
outEvent->deviceId = 0;
} else {
outEvent->deviceId = device->id;
}
outEvent->type = iev.type;
outEvent->scanCode = iev.code;
if (iev.type == EV_KEY) {
status_t err = device->layoutMap->map(iev.code,
& outEvent->keyCode, & outEvent->flags);
LOGV("iev.code=%d keyCode=%d flags=0x%08x err=%d\n",
iev.code, outEvent->keyCode, outEvent->flags, err);
if (err != 0) {
outEvent->keyCode = AKEYCODE_UNKNOWN;
outEvent->flags = 0;
}
} else {
outEvent->keyCode = iev.code;
}
outEvent->value = iev.value;
// Use an event timestamp in the same timebase as
// java.lang.System.nanoTime() and android.os.SystemClock.up
timeMillis()
// as expected by the rest of the system.
outEvent->when = systemTime(SYSTEM_TIME_MONOTONIC);
return true;
}
// Finish reading all events from devices identified in previous
poll().
// This code assumes that mInputDeviceIndex is initially 0 and t
hat the
// revents member of pollfd is initialized to 0 when the device
is first added.
// Since mFDs[0] is used for inotify, we process regular events
starting at index 1.
mInputDeviceIndex += 1;
if (mInputDeviceIndex >= mFDCount) {
break;
}
const struct pollfd& pfd = mFDs[mInputDeviceIndex];
if (pfd.revents & POLLIN) {
int32_t readSize = read(pfd.fd, mInputBufferData,
sizeof(struct input_event) * INPUT_BUFFER_SIZE);
if (readSize < 0) {
if (errno != EAGAIN && errno != EINTR) {
LOGW("could not get event (errno=%d)", errno);
}
} else if ((readSize % sizeof(struct input_event)) != 0) {
LOGE("could not get event (wrong size: %d)", readSize);
} else {
mInputBufferCount = readSize / sizeof(struct input_event
);
mInputBufferIndex = 0;
}
}
}
#if HAVE_INOTIFY
// readNotify() will modify mFDs and mFDCount, so this must be done
after
// processing all other events.
if(mFDs[0].revents & POLLIN) {
readNotify(mFDs[0].fd);
mFDs[0].revents = 0;
continue; // report added or removed devices immediately
}
#endif
mInputDeviceIndex = 0;
// Poll for events. Mind the wake lock dance!
// We hold a wake lock at all times except during poll(). This work
s due to some
// subtle choreography. When a device driver has pending (unread) e
vents, it acquires
// a kernel wake lock. However, once the last pending event has bee
n read, the device
// driver will release the kernel wake lock. To prevent the system
from going to sleep
// when this happens, the EventHub holds onto its own user wake lock
while the client
// is processing events. Thus the system can only sleep if there ar
e no events
// pending or currently being processed.
release_wake_lock(WAKE_LOCK_ID);
int pollResult = poll(mFDs, mFDCount, -1);
acquire_wake_lock(PARTIAL_WAKE_LOCK, WAKE_LOCK_ID);
if (pollResult <= 0) {
if (errno != EINTR) {
LOGW("poll failed (errno=%d)\n", errno);
usleep(100000);
}
}
}
}
--------------------------------------------------------------
如果嫌麻煩為什么不用android本身的讀取機制呢？考慮在它的dispatch上作攔截發送？
※ 引述《bightg (shoei 缺缺缺)》之銘言：
: 請問一下，我現在要寫個AP可以跟TouchPanel(I2C介面)作溝通，
: 我用.so的方式來做，目前可以對Device作read&write，
: 但是我想把Decice讀到的座標報給系統，
: 我用driver的report方式似乎無法使用?
: 請問有沒有什麼方法可以讓我把座標報給系統?
: 從AP端? 或是其他方法呢?
: 謝謝
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