SilverBlue SilverBlue - 2 months ago 20
Android Question

The OnLongClickListener don't works

I have a drag and drop code. If the user touch the item, the

OnTouchListener


Code starts:

View.OnTouchListener dragListener = new View.OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
// start move on a touch event
if (motionEvent.getAction() == MotionEvent.ACTION_DOWN) {
ClipData data = ClipData.newPlainText("", "");
View.DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(view);
view.startDrag(data, shadowBuilder, view, 0);
// API 24
// view.startDragAndDrop(data, shadowBuilder, view, View.DRAG_FLAG_GLOBAL); // API 24
view.setVisibility(View.VISIBLE);
return true;
}
return false;
}
};


But I would have a
OnLongClickListener
on my code. If the item was hold (long clicked) by the user, a toast messages was show on the display:

homebutton.setOnLongClickListener(new OnLongClickListener() {
public boolean onLongClick(View arg0) {
Toast.makeText(UserArea.this, "laaaange geklickt", Toast.LENGTH_SHORT).show();
return true;
}
});


But it doesn't work :-(

Answer

Edit your Touch Event and based on threshold you decide the TOuch or Long Press

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;
}
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