Android中的onTouch（）事件如何区分单击事件和滑动事件

private boolean isDown = false;
private float x1 = 0;
private float x2 = 0;
private float y1 = 0;
private float y2 = 0;

@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub

switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
x1 = event.getX();
y1 = event.getY();
isDown = true;
break;
case MotionEvent.ACTION_UP:
isDown = false;
break;
case MotionEvent.ACTION_MOVE:
x2 = event.getX();
y2 = event.getY();
break;

default:
break;
}

switch (v.getId()) {
case R.id.button_say:
if (event.getAction() == MotionEvent.ACTION_DOWN) {
StartTalk();
StopAudio();
// voiceChangeBtn.setImageResource(R.drawable.ptz_microphone_on1);
} else if (event.getAction() == MotionEvent.ACTION_UP) {
StopTalk();
StartAudio();
// voiceChangeBtn.setImageResource(R.drawable.ptz_microphone_on);
}
break;
case R.id.ipcamclient_whole_view:

dismissAllPopupwindow();
break;

case R.id.camera_flip_viewPager:
if (Math.abs((x1 - x2)) < 25 && Math.abs((y1 - y2)) < 25) {
if (isLandScreem && !isDown) {
dismissAllPopupwindow();
showBottom();
} else if (!isLandScreem && !isDown) {
dismissAllPopupwindow();
}
}
break;

default:
break;
}
return false;
}

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