Detect touch press vs long press vs movement

Question

I m currently fiddling around with Android programming  but I have a small problem detecting different touch events  namely a normal touch press  press on the screen and release right away   a long press  touch the screen and hold the finger on it  and movement  dragging on the screen    What I wanted to do is have an image  of a circle  on my screen which I can drag around  Then when I press it once  short normal press  a Toast comes up with some basic information about it  When I long press it  an AlertDialog with a list comes up to select a different image  circle  rectangle or triangle    I made a custom View with my own OnTouchListener to detect the events and draw the image in onDraw  The OnTouchListener onTouch goes something like this      has a touch press started  private boolean touchStarted   false     co-ordinates of image private int x  y   public boolean onTouch View v  MotionEvent event        int action   event getAction        if  action    MotionEvent ACTION DOWN            touchStarted   true            else if  action    MotionEvent ACTION MOVE               movement  cancel the touch press         touchStarted   false           x   event getX            y   event getY             invalidate       request draw           else if  action    MotionEvent ACTION UP            if  touchStarted                   touch press complete  show toast             Toast makeText v getContext     Coords      x          y  1000  show                         return true      The problem is that the press doesn t quite work as expected  because when I casually touch the screen it also detects a tiny bit of movement and cancels the touch press and moves around the image instead   I  hacked  around this a bit my introducing a new variable  mTouchDelay  which I set to 0 on ACTION DOWN  increase in MOVE and if it s    3 in MOVE I execute my  move  code  But I have a feeling this isn t really the way to go   I also haven t found out how to detect a long press  The culprit really is the MOVE which seems to always trigger   For an example of what I roughly want  see the Android application  DailyStrip   it shows an image of a comic strip  You can drag it if it s too large for the screen  You can tap it once for some controls to pop-up and long press it for an options menu   PS  I m trying to get it to work on Android 1 5  since my phone only runs on 1 5

User · Answer

From the Android Docs -  onLongClick    From View OnLongClickListener  This is called when the user either touches and holds the item  when in touch mode   or focuses upon the item with the navigation-keys or trackball and presses and holds the suitable  enter  key or presses and holds down on the trackball  for one second    onTouch    From View OnTouchListener  This is called when the user performs an action qualified as a touch event  including a press  a release  or any movement gesture on the screen  within the bounds of the item    As for the  moving happens even when I touch  I would set a delta and make sure the View has been moved by at least the delta before kicking in the movement code  If it hasn t been  kick off the touch code

User · Answer

This code can distinguish between click and movement  drag  scroll    In onTouchEvent set a flag isOnClick  and initial X  Y coordinates on ACTION DOWN  Clear the flag on ACTION MOVE  minding that unintentional movement is often detected which can be solved with a THRESHOLD const    private float mDownX  private float mDownY  private final float SCROLL THRESHOLD   10  private boolean isOnClick    Override public boolean onTouchEvent MotionEvent ev        switch  ev getAction    amp  MotionEvent ACTION MASK            case MotionEvent ACTION DOWN              mDownX   ev getX                mDownY   ev getY                isOnClick   true              break          case MotionEvent ACTION CANCEL          case MotionEvent ACTION UP              if  isOnClick                    Log i LOG TAG   onClick                       TODO onClick code                           break          case MotionEvent ACTION MOVE              if  isOnClick  amp  amp   Math abs mDownX - ev getX     gt  SCROLL THRESHOLD    Math abs mDownY - ev getY     gt  SCROLL THRESHOLD                     Log i LOG TAG   movement detected                    isOnClick   false                            break          default              break            return true      For LongPress as suggested above  GestureDetector is the way to go  Check this Q amp A   Detecting a long press with Android

User · Answer

I think you should implement GestureDetector OnGestureListener as described in Using GestureDetector to detect Long Touch  Double Tap  Scroll or other touch events in Android  and  androidsnippets and then implement tap logic in onSingleTapUp and move logic in onScroll events

User · Answer

GestureDetector SimpleOnGestureListener has methods to help in these 3 cases      GestureDetector gestureDetector   new GestureDetector context  new GestureDetector SimpleOnGestureListener                for single click event           Override         public boolean onSingleTapUp MotionEvent motionEvent                return true                       for detecting a press event  Code for drag can be added here           Override         public void onShowPress MotionEvent e                View child   recyclerView findChildViewUnder e getX    e getY                 ClipboardManager clipboardManager    ClipboardManager  context getSystemService Context CLIPBOARD SERVICE               ClipData clipData   ClipData newPlainText                           clipboardManager setPrimaryClip clipData                ConceptDragShadowBuilder dragShadowBuilder   new CustomDragShadowBuilder child                  drag child view              child startDrag clipData  dragShadowBuilder  child  0                        for detecting longpress event          Override         public void onLongPress MotionEvent e                super onLongPress e

User · Answer

If you need to distniguish between a click  longpress and a scroll use GestureDetector  Activity implements GestureDetector OnGestureListener  then create detector in onCreate for example  mDetector   new GestureDetectorCompat getActivity   getApplicationContext   this     then optionally setOnTouchListener on your View  for example webview  where   onTouch View v  MotionEvent event    return mDetector onTouchEvent event       and now you can use Override onScroll  onFling  showPress  detect long press  or onSingleTapUp  detect a click

User · Answer

I was just dealing with this mess after wanting longclick to not end with a click event   Here s what I did   public boolean onLongClick View arg0        Toast makeText getContext     long click   Toast LENGTH SHORT  show        longClicked   true      return false     public void onClick View arg0        if  longClicked           Toast makeText getContext     click   Toast LENGTH SHORT  show              longClick   false     sets the clickability enabled    boolean longClicked   false    It s a bit of a hack but it works

User · Answer

it just needed a ontouch event in the overlay class  check this  it helped me  http   mirnauman wordpress com 2012 04 16 android-google-maps-tutorial-part-6-getting-the-location-that-is-touched

User · Answer

I discovered this after a lot of experimentation   In the initialisation of your activity   setOnLongClickListener new View OnLongClickListener       public boolean onLongClick View view        activity openContextMenu view         return true      avoid extra click events         setOnTouch new View OnTouchListener      public boolean onTouch View v  MotionEvent e       switch e getAction  amp  MotionEvent ACTION MASK            do drag gesture processing                you MUST return false for ACTION DOWN and ACTION UP  for long click to work        you can return true for ACTION MOVEs that you consume          DOWN UP are needed by the long click timer         if you want  you can consume the UP if you have made a drag - so that after         a long drag  no long-click is generated      return false          setLongClickable true

User · Answer

I was looking for a similar solution and this is what I would suggest  In the OnTouch method  record the time for MotionEvent ACTION DOWN event and then for MotionEvent ACTION UP  record the time again  This way you can set your own threshold also  After experimenting few times you will know the max time in millis it would need to record a simple touch and you can use this in move or other method as you like   Hope this helped  Please comment if you used a different method and solved your problem

[java] Detect touch press vs long press vs movement?

onLongClick()

onTouch()

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