[英]swipe left, right, up and down depending on velocity or other variables
i've got a class extended from simple on gesture and i'm working with the onfling method:我有一个 class 从简单的手势扩展而来,我正在使用 onfling 方法:
class MyGestureListener extends GestureDetector.SimpleOnGestureListener{
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
// TODO Auto-generated method stub
float e1_X = e1.getX();
float e1_Y = e1.getY();
float e2_X = e1.getX();
float e2_Y = e2.getY();
if(velocityX > 0 && velocityX > velocityY){
text.setText("Swipe left");
}else if(velocityX < 0 && velocityX < velocityY){
text.setText("Swipe right");
}else if(velocityY < 0 && velocityX > velocityY){
text.setText("Swipe down");
}else if(velocityY > 0 && velocityX < velocityY){
text.setText("Swipe up");
}
return super.onFling(e1, e2, velocityX, velocityY);
}
}
I know it depends on certain angles but i can't do it, i tried with the velocityX, and velocityY, it's working only if you do it precisely.我知道这取决于某些角度,但我做不到,我尝试使用velocityX 和velocityY,它只有在你精确地执行时才有效。 But what i want is an angle of "mistake": if you swipe diagonally for example up and right i need to choose which is the good way.
但我想要的是一个“错误”的角度:如果你对角滑动例如向上和向右,我需要选择哪个是好方法。
You should check speed and distance.你应该检查速度和距离。 Here is an example of horizontal swipe detector.
这是水平滑动检测器的示例。 You can add vertical detection in the same manner.
您可以以相同的方式添加垂直检测。
public class HSwipeDetector extends SimpleOnGestureListener {
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;
@Override
public boolean onFling(final MotionEvent e1, final MotionEvent e2, final float velocityX, final float velocityY) {
if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH) { return false; }
/* positive value means right to left direction */
final float distance = e1.getX() - e2.getX();
final boolean enoughSpeed = Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY;
if(distance > SWIPE_MIN_DISTANCE && enoughSpeed) {
// right to left swipe
onSwipeLeft();
return true;
} else if (distance < -SWIPE_MIN_DISTANCE && enoughSpeed) {
// left to right swipe
onSwipeRight();
return true;
} else {
// oooou, it didn't qualify; do nothing
return false;
}
}
protected void onSwipeLeft() {
// do your stuff here
}
protected void onSwipeRight() {
// do your stuff here
}
}
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