I have an Activity that implements a Gesture Detector to catch the
user fling input for navigation to other screens. That was working
fine - but - I recently updated a class that derives from my
BaseActivity to add an onClick function and now that click event seems
to block the onFling from being hit. The onClick is tied to a TextView
area (in a LinearLayout) I have on my screen. The resultsClick method
is wired to the TextView using its onClick property in the XML layout.
I've tried changing the return values in onSingleTapUp and onDown
without luck. I've also tried adding log statements to all the
functions below as well. None of them fire when I fling in the
TextView area but they do on other areas of the screen.
Maybe I am using the wrong search terms, but I couldn't seem to find
an example that addressed this - yet I'm sure this problem has been
solved before.
public class DerivedActivity extends BaseActivity
{
...
/**
* resultsClick - The user clicked on the Results area
* @param v
*/
public void resultsClick(View v)
{
try
{
Log.i(this.toString(), "resultsClick");
startActivity(new Intent(this, Results_TabHost.class ));
}
catch (Exception e)
{
Log.e(this.toString(), "Exception" + e.toString());
}
}// end resultsClick
...
}
Here is the base class that implements the GestureListener code
public class BaseActivity extends ActivityGroup
implements OnGestureListener
{
...
private static final int SWIPE_MIN_DISTANCE = 120;
private static final int SWIPE_MAX_OFF_PATH = 250;
private static final int SWIPE_THRESHOLD_VELOCITY = 200;
public boolean onFling(MotionEvent e1,
MotionEvent e2,
float velocityX,
float velocityY)
{
try
{
Log.i(this.toString(), "onFling");
// jump right out if not a swipe/fling
if (Math.abs( e1.getY() - e2.getY() ) > SWIPE_MAX_OFF_PATH)
{
return false;
}
// right to left swipe
if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE &&
Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY )
{
Log.i(this.toString(), "fling left");
rightArrowClick(null);
}
else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE &&
Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY )
{
Log.i(this.toString(), "fling right");
leftArrowClick(null);
}
}
catch (Exception e)
{
Log.e(this.toString(), "Exception" + e.toString());
}
return true;
}// end onFling
// These next methods we are required to have - even if unused -
// in order for the Gesture Handling to work
@Override
public boolean onTouchEvent(MotionEvent motionEvent)
{
if(this.gestureDetector.onTouchEvent(motionEvent))
{
return true;
}
//no gesture detected, let Activity handle touch event
return super.onTouchEvent(motionEvent);
}
@Override
public void onLongPress(MotionEvent e)
{
// Intentionally not handling - must be overridden by listener
class
}
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float
distanceX, float distanceY)
{
// Intentionally not handling - must be overridden by listener
class
// Intentionally returning true - per code examples
return true;
}
@Override
public void onShowPress(MotionEvent e)
{
// Intentionally not handling - must be overridden by listener
class
}
@Override
public boolean onSingleTapUp(MotionEvent e)
{
// Intentionally not handling - must be overridden by listener
class
// Intentionally returning true - per code examples
return true;
}
@Override
public boolean onDown(MotionEvent e)
{
// Intentionally not handling - must be overridden by listener
class
// Intentionally returning true - per code examples
return true;
}
...
}
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