Hey,
I'm trying to develop a scrollable tile-based map system and I'm
having some trouble getting touch events to work correctly. I
currently have a surface view in a separate thread (almost identical
to the lunar lander example) and I am passing the touch events from
the view to my thread. The method in the thread is synchronized with
the holder as in the lunar lander example.
The following code works perfectly within the emulator:
boolean onTouchEvent(MotionEvent event) {
synchronized (_cellMap.getHolder()) {
// touch down
if (event.getAction() == MotionEvent.ACTION_DOWN) {
// start of a new event, reset the flag
mIsMoving = false;
// store the current touch coordinates for scroll
// calculation
mXTouch = (int) event.getX();
mYTouch = (int) event.getY();
} else if (event.getAction() == MotionEvent.ACTION_MOVE) { // &&
// touch starts moving, set the flag
mIsMoving = true;
// mIsTap = false;
// get the new offset
mXOffset += mXTouch - (int) event.getX();
mYOffset += mYTouch - (int) event.getY();
// secure, that the offset is never out of view bounds
if (mXOffset < 0) {
mXOffset = 0;
} else if (mXOffset > mMapSize * mTerritorySize -
getWidth() +
mTerritoryHalfSize) {
mXOffset = mMapSize * mTerritorySize -
getWidth() + (int)
mTerritoryHalfSize;
}
if (mYOffset < 0) {
mYOffset = 0;
} else if (mYOffset > mMapSize * mTerritorySize -
getHeight() -
mTerritorySize) {
mYOffset = mMapSize * mTerritorySize -
getHeight() -
mTerritorySize;
}
// store the last position
mXTouch = (int) event.getX();
mYTouch = (int) event.getY();
calculateLoopBorders();
} else if (event.getAction() == MotionEvent.ACTION_UP) {
// touch released
if (!mIsMoving) {
Territory terr = getTerritory(event.getX(),
event.getY());
// show the id of the touched cell
if (terr != null) {
selectTerritory(terr);
}
}
}
return true;
}
}
and is sitting within my thread. As I said this works perfectly within
the emulator but does not work when testing on a Nexus One running 2.1
OR 2.2.
I assume this is because fingers have more contact time with the
screen than mouse clicks and tend to move a round a tiny bit and so
are being registered as tiny moves. They never register as clicks and
so my tiles never highlight. They DO, however, highlight on the
emulator.
Please can someone help me work out how to make it clear to the above
code the difference between a tap and a move?
Thanks a lot,
Patrick
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