ImageView的的像素在运行时设定的大小 [英] Set size of ImageView in px at runtime

问题描述

我希望把8形象大拇指在一个水平线上，使用整个可用宽度。
这些图像检索到一个web服务，它可以让我指定的尺寸。
我试过如下：

I want to put 8 image thumbs in one horizontal line, using the whole available width.
The images are retrieved from a webservice which lets me specify the dimensions.
I tried the following:

int widthPx = container.getWidth();
LinearLayout thumbs = (LinearLayout)curView.findViewById(R.id.thumbs);
    for(int i=0; i<pics.length; i++) {
        ImageView iv = new ImageView(mContextt);

        int thumbSize = widthPx / 8;

        try {
            String url = "http://someurl/" + pics[i] + "&width=" + thumbSize  + "&height=" + thumbSize;
            URL imgUrl = new URL(url);
            Drawable imgD = Drawable.createFromStream(imgUrl.openStream(), "src");
            iv.setImageDrawable(imgD);
        }
        catch (Exception e) {
            Log.e(TAG, "loading image failed");
            e.printStackTrace();
        }

        thumbs.addView(iv);
    }

本的LinearLayout大拇指有安卓。layout_width =FILL_PARENT集这个code产生的拇指显著较小然后宽度的1/8这是为什么什么是正确的方法？

更新：
这code是里面的 onCreateView 的一个片段。虽然我的宽度值是基于根视图计算是正确的， thumbs.getWidth（）的返回0，虽然视图之前膨胀并还应该有480因为layout_width的宽度被设定到FILL_PARENT。我不知道这是一个问题。

The LinearLayout thumbs has android:layout_width="fill_parent set. The thumbs produced by this code are significantly smaller then 1/8 of the width. Why is this? What would be the correct way?

Update:
This code is inside onCreateView of a Fragment. While my width value is calculated based on the root-view and is correct, thumbs.getWidth() returns 0, although the view is inflated before and should also have a width of 480 because of layout_width is set to fill_parent. I'm not sure if that's a problem.

是我的假设是正确的创建ImageViews的布局是默认设置为WRAP_CONTENT？如果不是，该如何设置与Java code？

Is my assumption correct that the layout of the created ImageViews is set to wrap_content by default? If not, how to set this with Java code?

推荐答案

添加的ImageView s的固定大小，即：

Add the ImageViews with a fixed size, i.e.:

thumbs.addView (iv, new LayoutParams(thumbSize, thumbSize));

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要回答（部分）在评论这些问题：

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To answer (partially) the questions in the comments:

借助 ImageView的 API说：

负责从图像计算它的测量，以便它可以在任何布局管理器可使用

takes care of computing its measurement from the image so that it can be used in any layout manager

所以它可能是假设60PX为160 DPI（我可能是错了）。

so it is probably assuming 60px for a 160 dpi (I may be wrong there).

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