如何正确设置自定义长按监听器？

Question

I'm trying to set my own long click listener on Unlock button. Whenever I press the Unlock button it summarize duration and I can unlock permanently clicking.

Unlock.setOnTouchListener(new View.OnTouchListener() {
                @Override
                public boolean onTouch(final View v, MotionEvent event) {
                    if (event.getAction() == MotionEvent.ACTION_DOWN) {
                        Unlock.setText("Press to unlock");
                        isLongPress = true;
                        Handler handler = new Handler();
                        handler.postDelayed(new Runnable() {
                            @Override
                            public void run() {
                                if (isLongPress) {
                                    Unlock();
                                }
                            }
                        }, longClickDuration); //amount of time of long click
                    } else if (event.getAction() == MotionEvent.ACTION_UP) {
                        Unlock.setText("Unlock");
                        isLongPress = false;
                    }
                    return true;
                }
            });
        }catch (Exception e) {
            // TODO: handle exception
        }
    }

Answer 1

If you want to just handle long clicks consider using the following code:

        Unlock.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View v) {
                your code
            }
        });

But if the Unlock(); should be invoked after a certain (customizable) amount of time, you should measure this time in MotionEvent.ACTION_UP handler. As @Attaullah Khan said, use SystemClock.elapsedRealtime() system timer to correctly count number of milliseconds at two moments (when button was pressed and released) and if the time is greater than longClickDuration then invoke Unlock

The handler.postDelayed that you call in MotionEvent.ACTION_DOWN handler just invokes a check of pressed state after longClickDuration interval and if your button gets suddenly pressed at that moment, the verification passes that is not correct