Java 在将手指从屏幕上分离之前(或不分离),如何执行滑动操作?
我正在使用下面的类来处理一些刷卡操作Java 在将手指从屏幕上分离之前(或不分离),如何执行滑动操作?,java,android,swipe,Java,Android,Swipe,我正在使用下面的类来处理一些刷卡操作 public class OnSwipeTouchListener implements View.OnTouchListener { private final GestureDetector gestureDetector; public OnSwipeTouchListener(Context ctx) { gestureDetector = new GestureDetector(ctx, new GestureL
public class OnSwipeTouchListener implements View.OnTouchListener {
private final GestureDetector gestureDetector;
public OnSwipeTouchListener(Context ctx) {
gestureDetector = new GestureDetector(ctx, new GestureListener());
}
@Override
public boolean onTouch(View v, MotionEvent event) {
return gestureDetector.onTouchEvent(event);
}
private final class GestureListener extends GestureDetector.SimpleOnGestureListener {
private static final int SWIPE_THRESHOLD = 100;
private static final int SWIPE_VELOCITY_THRESHOLD = 100;
@Override
public boolean onDown(MotionEvent e) {
return true;
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
boolean result = false;
try {
float diffY = e2.getY() - e1.getY();
float diffX = e2.getX() - e1.getX();
if (Math.abs(diffX) > Math.abs(diffY)) {
if (Math.abs(diffX) > SWIPE_THRESHOLD && Math.abs(velocityX) > SWIPE_VELOCITY_THRESHOLD) {
if (diffX > 0) {
onSwipeRight();
} else {
onSwipeLeft();
}
result = true;
}
} else if (Math.abs(diffY) > SWIPE_THRESHOLD && Math.abs(velocityY) > SWIPE_VELOCITY_THRESHOLD) {
if (diffY > 0) {
onSwipeBottom();
} else {
onSwipeTop();
}
result = true;
}
} catch (Exception exception) {
exception.printStackTrace();
}
return result;
}
}
public void onSwipeRight() {
}
public void onSwipeLeft() {
}
public void onSwipeTop() {
}
public void onSwipeBottom() {
}
}
我想知道是否可以在(或不)将手指从屏幕上分离之前执行滑动操作?或者可以同时进行吗?
以上所用类别的参考:
如果你处理这个问题的方式完全不同,请不要将你的答案局限于上述课程;因为我只需要管理好这一切