MarginLayoutParams.setMargins()无法正常工作?

问题描述

这就是问题:我想以编程方式添加一些图像.除第一个图像外，图像还必须具有topMargin的5dip，并以vertical orientation的方式使用LinearLayout.在代码段下方:

Here's the thing: I want to add some images programmatically. The images should have to have a topMargin of 5dip except for the first image, in a LinearLayout with a vertical orientation manner. below the code segment:

LinearLayout body = (LinearLayout) findViewById(R.id.body);

    for (int i = 1; i <= 4; i++) {

        ImageView img = new ImageView(this);
        MarginLayoutParams lp = new MarginLayoutParams(-2, -2);

        img.setImageResource(R.drawable.image);
        if (i != 1) {

            lp.setMargins(0, 5, 0, 0);

        }
        img.setLayoutParams(lp);

        body.addView(img);
        body.requestLayout();
    }

通过运行程序，我可以看到4个图像(此处)一一垂直对齐，但是没有topMargin(如代码中的5dip). body是LinearLayout的id.这是XML段:

By running the program I can see the the 4 images(here) vertically aligned one by one but there is no topMargin(as in the code,5dip). body is the id of the LinearLayout. here's the XML segment to:

<LinearLayout
            android:id="@+id/body"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="#901b0e08"
            android:orientation="vertical"
            android:paddingLeft="6dp"
            android:paddingRight="8dp" >
 </LinearLayout>

我无法理解这里出了什么问题.

I cant get what went wrong here.

谢谢.

推荐答案

尝试将您的MarginLayoutParams更改为此:

LayoutParams lp = new LinearLayout.LayoutParams( LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT );

之所以这样做，是因为body是LinearLayout，因此您可能想使用特定于LinearLayout的LayoutParams.

The reason for doing this, is that body is a LinearLayout and thus you would want to use the LinearLayout-specific LayoutParams.

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