我想要检测到有人从工具栏拖/扔下来,以类似于Chrome的方式,意图关闭活动。
然而,我发现根本没有检测到手势(我发现这是因为onFling()
从来没有被调用过),但是仍然可以检测到单击/双击。
下面是我用来测试它是否正常工作的代码片段:
@Override
protected void onCreate(Bundle savedInstanceState) {
/*...*/
Toolbar toolbar = (Toolbar) findViewById(R.id.wizard_toolbar);
final GestureDetector toolbarGestureDetector = new GestureDetector(this, new GestureDetector.SimpleOnGestureListener () {
static final int MIN_SWIPE_VELOCITY = 200;
static final int MIN_SWIPE_DISTANCE = 200;
@Override
public boolean onDown(MotionEvent e) { return true; }
@Override
public boolean onSingleTapUp(MotionEvent e) {
Toast.makeText(EventCreationWizard.this, "You touched me!!!", Toast.LENGTH_LONG).show();
return true;
}
@Override
public boolean onDoubleTap(MotionEvent e) {
Toast.makeText(EventCreationWizard.this, "You touched me!!! Twice!!!", Toast.LENGTH_LONG).show();
return super.onDoubleTap(e);
}
@Override
public boolean onFling(MotionEvent event1, MotionEvent event2, float velocityX, float velocityY) {
if((event2.getY() - event2.getY() >= MIN_SWIPE_DISTANCE) && (Math.abs(velocityY) >= MIN_SWIPE_VELOCITY)) {
Toast.makeText(EventCreationWizard.this, "You swiped me!!!", Toast.LENGTH_LONG).show();
return true;
}
return false;
}
});
toolbar.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
return toolbarGestureDetector.onTouchEvent(motionEvent);
}
});
setSupportActionBar(toolbar);
/*...*/
}
发布于 2019-03-29 04:08:21
if((event2.getY() - event2.getY() >= MIN_SWIPE_DISTANCE) && (Math.abs(velocityY) >= MIN_SWIPE_VELOCITY)) {
Toast.makeText(EventCreationWizard.this, "You swiped me!!!", Toast.LENGTH_LONG).show();
return true;
}
你减去event2.getY()两次,所以它永远不会超过MIN_SWIPE_DISTANCE。
https://stackoverflow.com/questions/39122204
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