CODEWITHSUNDEEP
androidtouch-eventontouchlistener
NullPointerException
NullPointerException

Reputation: 37577

How to check if screen is touched for more than 2 seconds

Which is the best and more optimized strategy to check if the screen has been touched for 2 seconds or more without stopping the main UI thread?

I have checked some sample codes but I'm not sure which is the best approach to achieve it, and also I need to do it without stopping the main UI thread.

Thanks

Upvotes: 0

Views: 2212

Answers (3)

Dhwanik Gandhi
Dhwanik Gandhi

Reputation: 685

I used a OnTouchListener on a RelativeLayout. I hope this will help you.

RelativeLayout ll = (RelativeLayout) findViewById(R.id.ll);
ll.setOnTouchListener(new View.OnTouchListener() {

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        switch (event.getAction()) {
            case MotionEvent.ACTION_UP:

                long clickDuration = Calendar.getInstance().getTimeInMillis() - startClickTime;
                if (clickDuration >= MIN_CLICK_DURATION) {
                    Toast.makeText(MainActivity.this, "TOUCHED FOR" + clickDuration + "MS", Toast.LENGTH_SHORT).show();
                }
                longClickActive = false;

                break;
            case MotionEvent.ACTION_DOWN:

                if (longClickActive == false) {
                    longClickActive = true;
                    Toast.makeText(MainActivity.this, "touch!", Toast.LENGTH_SHORT).show();
                    startClickTime = Calendar.getInstance().getTimeInMillis();
                }
                break;

            case MotionEvent.ACTION_MOVE:
                if (longClickActive == true) {

                    longClickActive = false;
                }
                break;
        }
        return true;
    }
});

Upvotes: 1

Xaver Kapeller
Xaver Kapeller

Reputation: 49807

You can implement an OnTouchListener like this:

public abstract class TouchTimer implements View.OnTouchListener {

    private long touchStart = 0l;
    private long touchEnd = 0l;

    @Override
    public boolean onTouch(View view, MotionEvent event) {
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                this.touchStart = System.currentTimeMillis();
                return true;

            case MotionEvent.ACTION_UP:
                this.touchEnd = System.currentTimeMillis();
                long touchTime = this.touchEnd - this.touchStart;
                onTouchEnded(touchTime);
                return true;

            case MotionEvent.ACTION_MOVE:
                return true;

            default:
                return false;
        }
    }

    protected abstract void onTouchEnded(long touchTimeInMillis);
}

You would use it like this:

view.setOnTouchListener(new TouchTimer() {
    @Override
    protected void onTouchEnded(long touchTimeInMillis) {
        // touchTimeInMillis contains the time the touch lasted in milliseconds
    }
});

The method onTouchEnded() is called once the touch ends.

Upvotes: 6

Zielony
Zielony

Reputation: 16537

All gesture detection parts of Android code internally use combination of Handler class and postDelayed method. You can use it to post pieces of code to be run after arbitrary amount of time (for example 2 seconds).

  1. override dispatchTouchEvent
  2. if event is a press event, get Handle, postDelayed runnable and save it
  3. if event is a release/cancel event, remove all your previous runnables

  4. wait 2 secs for code to be run

    Runnable runnable;

@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
    if (ev.getAction() == MotionEvent.ACTION_DOWN) {
        runnable = new Runnable() {
            @Override
            public void run() {
                //do something
            }
        };
        getHandler().postDelayed(runnable, 2000);
    } else if (ev.getAction() == MotionEvent.ACTION_UP 
            || ev.getAction() == MotionEvent.ACTION_CANCEL) {
        getHandler().removeCallbacks(runnable);
    }
    return super.dispatchTouchEvent(ev);
}

see: http://developer.android.com/reference/android/os/Handler.html#postDelayed(java.lang.Runnable, long)

Upvotes: 0

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