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DragGestureDetector pour détecter gauche, à droite, en haut et en bas
// On swipe down -> RIGHT and then DOWN
// On swipe right -> RIGHT and then DOWN
// On swipe left -> LEFT
// On swipe up -> LEFT and then UPpublic class DragGestureDetector {
public static String DEBUG_TAG = "DragGestureDetector";
private GestureDetectorCompat mGestureDetector;
private DragListener mListener;
private boolean mStarted = false;
private MotionEvent mOriginalEvent;
float x1,x2;
float y1, y2;
public interface DragListener {
boolean onDragStart(MotionEvent e1, MotionEvent e2, float distanceX,
float distanceY);
boolean onDragContinue(MotionEvent e1, MotionEvent e2, float distanceX,
float distanceY);
boolean onDragEnd(MotionEvent e1, MotionEvent e2);
boolean onTapUp();
}
public DragGestureDetector(Context context, DragListener myDragListener){
mGestureDetector = new GestureDetectorCompat(context,new MyGestureListener());
mListener = myDragListener;
}
public void onTouchEvent(MotionEvent event){
mGestureDetector.onTouchEvent(event);
int action = MotionEventCompat.getActionMasked(event);
switch(action) {
case MotionEvent.ACTION_UP:
if(mStarted) {
mListener.onDragEnd(mOriginalEvent, event);
}
mStarted = false;
x2 = event.getX();
y2 = event.getY();
if (x1 < x2)
{
System.out.println("sammy_RIGHT");
}
if (x1 > x2)
{
System.out.println("sammy_LEFT");
}
if (y1 < y2)
{
System.out.println("sammy_DOWN");
}
if (y1 > y2)
{
System.out.println("sammy_UP");
}
break;
case MotionEvent.ACTION_DOWN:
//need to set this, quick tap will not generate drap event, so the
//originalEvent may be null for case action_up
//which lead to null pointer
mOriginalEvent = event;
x1 = event.getX();
y1 = event.getY();
break;
}
}
class MyGestureListener extends GestureDetector.SimpleOnGestureListener {
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
float distanceY) {
if(mListener == null) return true;
if(!mStarted){
mListener.onDragStart(e1,e2,distanceX,distanceY);
mStarted = true;
}
else{
mListener.onDragContinue(e1,e2,distanceX,distanceY);
}
mOriginalEvent = e1;
return true;
}
@Override
public boolean onSingleTapUp(MotionEvent e) {
return mListener.onTapUp();
}
}
}Je DragGestureDetector la mise en œuvre de ce library. Je veux détecter l'action de balayage de HAUT, GAUCHE, DROITE et BAS correctement. Mon code actuel ne détecte que le balayage à gauche correctement. Je montre ce que LOG imprime dans LOGCAT lors du balayage.