Android webview 不应该在长按时显示操作栏

Posted 2023-02-27

【中文标题】Android webview 不应该在长按时显示操作栏

【英文标题】：Android webview should not display action bar on long press

【发布时间】：2014-12-20 11:23:43

【问题描述】：

当我在 android webview 中选择（长按）文本时，我不想完全显示操作栏，但我需要在屏幕上保持选择。我怎样才能做到这一点。提前致谢。

【参考方案1】：

使用 touch Listner 实现长按，然后在按钮 Preess[ACTION_DOWN] 上放置隐藏 ActionBar 的代码，并在按钮释放时放置显示操作栏的代码[ACTION_UP 或 ACTION_MOVE]

  ActionBar actionBar = getActionBar();


   //on long presss hide ur action bar:

textView.setOnTouchListener(new OnTouchListener()
    private Timer longpressTimer; //won't depend on a motion event to fire
    private final int longpressTimeDownBegin = 500; //0.5 s
    private Point previousPoint;

    switch(event.getAction())

    case MotionEvent.ACTION_DOWN:
        longPressTimer = new Timer();
        longpressTimer.schedule(new TimerTask()
            // hide the action bar
          actionBar.hide();
        , longpressTimeDownBegin);
        return true; //the parent was also handling long clicks
    
    case MotionEvent.ACTION_MOVE:
        Point currentPoint = new Point((int)event.getX(), (int)event.getY());

        if(previousPoint == null)
            previousPoint = currentPoint;
        
        int dx = Math.abs(currentPoint.x - previousPoint.x);
        int dy = Math.abs(currentPoint.y - previousPoint.y);
        int s = (int) Math.sqrt(dx*dx + dy*dy);
        boolean isActuallyMoving = s >= minDisToMove; //we're moving

        if(isActuallyMoving) //only restart timer over if we're actually moving (threshold needed because everyone's finger shakes a little)
            cancelLongPress();
            return false; //didn't trigger long press (will be treated as scroll)
        
        else //finger shaking a little, so continue to wait for possible long press
            return true; //still waiting for potential long press
        
    
    default:
        cancelLongPress();

    // show the action bar
    actionBar.show();
        return false;
    
    

很简单