android getHeight()/getWidth 与relativelayout

发布于 2024-12-07 04:03:06 字数 898 浏览 0 评论 0原文

您好，我是 Android 新手，面临着以下问题：如何获取放置在相对布局中的视图的高度/宽度？我尝试了 getHeight() 和 getWidth() ，两者都返回 0。

我需要知道该视图是否已到达布局的末尾，以便我可以将下一个视图放置在其右侧或下方。

或者也许有更好的方法来做到这一点而不知道当前视图的位置？

编辑：我使用此代码创建一个 EditText 并将其添加到布局中：

                EditText et1 = new EditText(context);
                RelativeLayout.LayoutParams p = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
                        ViewGroup.LayoutParams.WRAP_CONTENT);
                p.addRule(RelativeLayout.RIGHT_OF,curView.getId());
                et1.setLayoutParams(p);
                et1.setId(loopid++);
                curLayout.addView(et1);
                curView=et1;

然后调用：

            int[] location=new int[2];
            curView.getLocationOnScreen(location);
            Log.d("right:", String.valueOf(location[1]));

它显示 0。

原文

Hi I'm new to Android and am facing the problem: how do I get the Height/Width of a view, which is placed in a relative layout? I tried getHeight() and getWidth() and both return 0.

I need to know whether this view has reached the end of the Layout so that I can place the next view to its right or below it.

or maybe there is a better way to do this without knowing the position of the current view?

edit:
I use this code to create an EditText and add it to the layout:

                EditText et1 = new EditText(context);
                RelativeLayout.LayoutParams p = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
                        ViewGroup.LayoutParams.WRAP_CONTENT);
                p.addRule(RelativeLayout.RIGHT_OF,curView.getId());
                et1.setLayoutParams(p);
                et1.setId(loopid++);
                curLayout.addView(et1);
                curView=et1;

and then call:

            int[] location=new int[2];
            curView.getLocationOnScreen(location);
            Log.d("right:", String.valueOf(location[1]));

and it shows a 0.

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牵强ㄟ 2024-12-14 04:03:06

您在布局视图之前调用 getHeight()/getWidth()，因此它返回 0。如果您在生命周期的后期调用它，它将停止此问题。

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凉城 2024-12-14 04:03:06

一旦创建了视图，UIThread 就会膨胀它们。因此，当您实例化它们时，它们没有大小。
尝试使用

ViewTreeObserver vto = curView.getViewTreeObserver();
vto.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() 
{
    public boolean onPreDraw()
    {
        curView.getLocationOnScreen(location);
    }
}

但不确定它是否有效

Once your views are created, the UIThread inflates them. So when you instanciate them they have no size.
try using

ViewTreeObserver vto = curView.getViewTreeObserver();
vto.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() 
{
    public boolean onPreDraw()
    {
        curView.getLocationOnScreen(location);
    }
}

Not sure if it'll work though

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困倦 2024-12-14 04:03:06

final Button button = new Button(this);
button.setText("123");
TextPaint paint = button.getPaint();
float len = paint.measureText(button.getText().toString());

该 len 将在加上固定值后给出按钮宽度

final Button button = new Button(this);
button.setText("123");
TextPaint paint = button.getPaint();
float len = paint.measureText(button.getText().toString());

This len will give buttons width after plus a fixed value

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