以编程方式更改视图的右边距?

问题描述

这个属性可以在Java代码中动态改变吗?

Can this attribute be changed dynamically in Java code?

android:layout_marginRight

我有一个 TextView，它必须动态地将它的位置向左改变一些像素.

I have a TextView, that has to change its position some pixels to the left dynamically.

如何以编程方式执行此操作?

How to do it programmatically?

推荐答案

一种更通用的方法，不依赖于布局类型(除了它是一种支持边距的布局类型):

A more generic way of doing this that doesn't rely on the layout type (other than that it is a layout type which supports margins):

public static void setMargins (View v, int l, int t, int r, int b) {
    if (v.getLayoutParams() instanceof ViewGroup.MarginLayoutParams) {
        ViewGroup.MarginLayoutParams p = (ViewGroup.MarginLayoutParams) v.getLayoutParams();
        p.setMargins(l, t, r, b);
        v.requestLayout();
    }
}

您应该查看 TextView 的文档.基本上，您需要获取 TextView 的 LayoutParams 对象，并修改边距，然后将其设置回 TextView.假设它在 LinearLayout 中，请尝试以下操作:

You should check the docs for TextView. Basically, you'll want to get the TextView's LayoutParams object, and modify the margins, then set it back to the TextView. Assuming it's in a LinearLayout, try something like this:

TextView tv = (TextView)findViewById(R.id.my_text_view);
LinearLayout.LayoutParams params = (LinearLayout.LayoutParams)tv.getLayoutParams();
params.setMargins(0, 0, 10, 0); //substitute parameters for left, top, right, bottom
tv.setLayoutParams(params);

我现在无法测试它，所以我的转换可能有点偏离，但需要修改 LayoutParams 以更改边距.

I can't test it right now, so my casting may be off by a bit, but the LayoutParams are what need to be modified to change the margin.

不要忘记，如果你的 TextView 在里面，例如，一个RelativeLayout，应该使用 RelativeLayout.LayoutParams 而不是LinearLayout.LayoutParams

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