如何获得android.widget.ImageView的宽度和高度？ [英] How to get the width and height of an android.widget.ImageView?

问题描述

<$p$p><$c$c>╔══════════════════════════════════════════════╗ ^ ║ImageView的╔══════════════╗║| ║║║║| ║║实际图像║║| ║║║║| ImageView的的60PX高度 ║║║║| ║║║║| ║╚══════════════╝║| ╚══════════════════════════════════════════════╝ ＆LT; ------------------------------------------------ ＆GT;                    ImageView的的90px宽度

我有一些默认的高度和宽度的图像显示，图像存储在数据库，我想根据ImageView的高度宽度缩放图像。由于我不想牛逼给默认值，因为当过我改变它的高度和宽度，我也有在code更改。

我试图获得的ImageView的高度和宽度，但0返回到我在这两种情况下。 请帮我

  INT身高=（（ImageView的）v.findViewById（R.id.img_ItemView））的getHeight（）。
 

这将返回我0甚至有默认的高度和宽度

解决方案

我在<一个答案href="http://stackoverflow.com/questions/4649438/how-to-get-the-dimensions-of-a-drawable-in-an-imageview/4649842">this问题可以帮助你：

  INT finalHeight，finalWidth;
最后ImageView的IV =（ImageView的）findViewById（R.id.scaled_image）;
最后的TextView电视=（TextView中）findViewById（R.id.size_label）;
ViewTreeObserver VTO = iv.getViewTreeObserver（）;
vto.addOn preDrawListener（新ViewTreeObserver.On preDrawListener（）{
    在preDraw公共布尔（）{
        iv.getViewTreeObserver（）removeOn preDrawListener（本）。
        finalHeight = iv.getMeasuredHeight（）;
        finalWidth = iv.getMeasuredWidth（）;
        tv.setText（高：+ finalHeight +宽：+ finalWidth）;
        返回true;
    }
}）;
 

您可以再从内上preDraw添加您的图像缩放work（）方法。

╔══════════════════════════════════════════════╗   ^
║ ImageView    ╔══════════════╗                ║   |
║              ║              ║                ║   |
║              ║ Actual image ║                ║   |
║              ║              ║                ║   |60px height of ImageView
║              ║              ║                ║   |
║              ║              ║                ║   |
║              ╚══════════════╝                ║   |
╚══════════════════════════════════════════════╝   
<------------------------------------------------>
                   90px width of ImageView

I have an image view with some default height and width, images are stored in db and I want to scale Image according to imageview height width. As I don't want t give default values because when ever I change its height and width I also have to change it in code.

I am trying to get the height and width of ImageView but 0 is returned to me in both cases. please help me

int height = ((ImageView) v.findViewById(R.id.img_ItemView)).getHeight();

this returns me 0 even it has default height and width

解决方案

My answer on this question might help you:

int finalHeight, finalWidth;
final ImageView iv = (ImageView)findViewById(R.id.scaled_image);
final TextView tv = (TextView)findViewById(R.id.size_label);
ViewTreeObserver vto = iv.getViewTreeObserver();
vto.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
    public boolean onPreDraw() {
        iv.getViewTreeObserver().removeOnPreDrawListener(this);
        finalHeight = iv.getMeasuredHeight();
        finalWidth = iv.getMeasuredWidth();
        tv.setText("Height: " + finalHeight + " Width: " + finalWidth);
        return true;
    }
});

You can then add your image scaling work from within the onPreDraw() method.

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