CODEWITHSUNDEEP
android
Huichos
Huichos

Reputation: 43

Specific Double Tap

I have zoomable image and I'm using ScaleGestureDetector.SimpleOnScaleGestureListener. I need to implement following items:

  1. On Single Tap appear Toast with information about picture.
  2. On Double Tap image is zooming.

I have some issue. Before Double Tap always is Single Tap and picture is zooming, but appear Toast. Is there any way to avoid Single Tap? I dont have enough savvy to solve this problem.

P.S. I can't use OnDoubleTapListener because use ScaleGestureDetector.SimpleOnScaleGestureListener.

UPD

case MotionEvent.ACTION_UP:
    firstTime = System.currentTimeMillis();
    if (Math.abs(firstTime-secondTime) < 300L) {
    // scale my matrix
    ---//---
    DONE = true; //this flag symbolize, that toast doesn't appear (false - appears)
    }
    else if (!DONE) {
         // making toast
    }
    secondTime = firstTime;
    break;

When DoubleTap is enable image scaled but appears toast

Upvotes: 1

Views: 445

Answers (2)

Huichos
Huichos

Reputation: 43

@matt5784, thank you. I was able to solve my problem. 

case MotionEvent.ACTION_UP:
    float xDiff =  Math.abs(curr.x - start.x);
    float yDiff =  Math.abs(curr.y - start.y);
    firstTime = System.currentTimeMillis();
    if (Math.abs(firstTime-secondTime) > 200L) {
        myHand.postDelayed(mRun, 200);
    }
    else if (!DONE) {
        //scale my matrix
        DONE = true; //this flag symbolize, that toast doesn't appear (false - appears)
    }
    secondTime = firstTime;
    break;

Handler myHand = new Handler();
private Runnable mRun = new Runnable() {
    @Override
    public void run() {
        if (!DONE) {
                     // make toast
        }
    }

Upvotes: 2

matt5784
matt5784

Reputation: 3085

I would suggest implementing a delay where the information doesn't pop up immediately on a single tap, but only is displayed if it doesn't encounter a second tap within a reasonable amount of time (probably whatever your threshold for double-taps is). I.e. if it is set up to register any taps within .2 seconds as a double tap, don't display the info until you have waited .2 secs and are sure there isn't a double tap.

Alternate solution (probably less useful) - have the double tap/zoom function call whatever function makes the information box disappear. However it will probably still pop up for a very short amount of time which may look silly/be problematic.

Upvotes: 0

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