android - Detect touch press vs long press vs movement? -

i'm fiddling around android programming, have small problem detecting different touch events, namely normal touch press (press on screen , release right away), long press (touch screen , hold finger on it) , movement (dragging on screen).

what wanted have image (of circle) on screen can drag around. when press once (short/normal press) toast comes basic information it. when long press it, alertdialog list comes select different image (circle, rectangle or triangle).

i made custom view own ontouchlistener detect events , draw image in ondraw. ontouchlistener.ontouch goes this:

// has 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 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 press doesn't quite work expected, because when casually touch screen detects tiny bit of movement , cancels touch press , moves around image instead.

i "hacked" around bit introducing new variable "mtouchdelay" set 0 on action_down, increase in move , if it's >= 3 in move execute "move" code. have feeling isn't way go.

i haven't found out how detect long press. culprit move seems trigger.

for example of want, see android application "dailystrip": shows image of comic strip. can drag if it's large screen. can tap once controls pop-up , long press options menu.

ps. i'm trying work on android 1.5, since phone runs on 1.5.

this code can distinguish between click , movement (drag, scroll). in ontouchevent set flag isonclick, , initial x, y coordinates on action_down. clear flag on action_move (minding unintentional movement detected can solved 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() & 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 && (math.abs(mdownx - ev.getx()) > scroll_threshold || math.abs(mdowny - ev.gety()) > scroll_threshold)) {                 log.i(log_tag, "movement detected");                 isonclick = false;             }             break;         default:             break;     }     return true; } 

for longpress suggested above, gesturedetector way go. check q&a:

detecting long press android