implelenting onUp event handler using SimpleOnGestureListener
I'm kinda new to Android programming and I recently turned my attention to handling simple gestures. I know about the GestureDetector and the listener and I succesfully implemented simple gestures (onDown, onFling, onScroll) which I need. The problem is I need the onUp method which is not available in the SimpleOnGestureListener class. I have an activity and a custom View. The view doesn't really do anything, just changes the background color. I'm doing all the event handling in the activity.
What I tried is handling the ACTION_UP event in the view's onTouchListener's onTouch method, but this way onFLing won't work. I also read about a solution here: OnUp event on GestureDetector ,which says I should overwrite the onTouchEvent but it was unclear to me which onTouchEvent should I overwrite, where and how. I'm inserting my current code, maybe it helps. :)
public class Main extends Activity
{
private GestureDetector gDetector;
public CustomView cView;
View.OnTouchListener gestureListener;
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;
public Vibrator vibrator;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
vibrator = (Vibrator)getApplicationContext().getSystemService(Context.VIBRATOR_SERVICE);
gDetector=new GestureDetector(this, new gListener());
gDetector.setIsLongpressEnabled(true);
gestureListener=new View.OnTouchListener(){
public boolean onTouch(View v, MotionEvent event)
{
if(event.getAction()==MotionEvent.ACTION_UP)
{
cView.setBackgroundColor(Color.RED);
return true;
}
else
return gDetector.onTouchEvent(event);
}
};
cView=new CustomView(this);
cView.setOnTouchListener(gestureListener);
cView.setBackgroundColor(Color.BLACK);
cView.setLongClickable(true);
setContentView(cView);
}
class gListener extends GestureDetector.SimpleOnGestureListener
{
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY)
{
try
{
if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
return false;
if(e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
cView.setBackgroundColor(Color.WHITE);
} else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
cView.setBackgroundColor(Color.GRAY);
}
} catch (Exception e) {
// nothing
}
return false;
}
@Override
public boolean onScroll (MotionEvent e1, MotionEvent e2, float distanceX, float distanceY)
{
vibrator.vibrate(30);
Log.d("Event", "MOVE");
return true;
}
@Override
public boolean onDown(MotionEvent e)
{
cView.setBackgroundColor(Color.BLUE);
Log.d("Event", "DOWN");
return true;
}
@Override
public boolean onSingleTapUp(MotionEvent e)
{
Log.d("Event", "UP");
return true;
}
}
}
尝试这种方法...
@Override
public boolean onTouchEvent(MotionEvent me) {
Log.v("Touch", "ontouch: " + me.getAction());
if(me.getAction() == 0){
Log.v("Touch Down", "Down");
}
else if (me.getAction() == 1) {
Log.v("Touch Up", "Up");
}
else if (me.getAction() == 2) {
Log.v("touch Scroll", "Scroll");
}
boolean detectedUp = event.getAction() == MotionEvent.ACTION_UP;
if (!mGestureDetector.onTouchEvent(event) && detectedUp)
{
return onUp(event);
}
return true;
}