在线性布局中以编程方式设置边距

我试图使用Java(不是XML)创建一个线性布局的按钮，填充屏幕，并有边缘。下面是没有边距的代码:

LinearLayout buttonsView = new LinearLayout(this);
buttonsView.setOrientation(LinearLayout.VERTICAL);
for (int r = 0; r < 6; ++r) {
    Button btn = new Button(this);
    btn.setText("A");

    LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.FILL_PARENT); // Verbose!
    lp.weight = 1.0f; // This is critical. Doesn't work without it.
    buttonsView.addView(btn, lp);
}

ViewGroup.LayoutParams lp = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT);
setContentView(buttonsView, lp);

所以这很好，但你到底如何给按钮空白，使它们之间有空间?我尝试使用线性布局。MarginLayoutParams，但它没有weight成员，所以不好。如果你在构造函数中传入lp，它也不会起作用。

这不可能吗?因为它看起来很像，它也不是第一个只能用XML完成的Android布局任务。

当前回答

/*
 * invalid margin
 */
private void invalidMarginBottom() {
    RelativeLayout.LayoutParams lp = (RelativeLayout.LayoutParams) frameLayoutContent.getLayoutParams();
    lp.setMargins(0, 0, 0, 0);
    frameLayoutContent.setLayoutParams(lp);
}

你应该注意视图的viewGroup的类型。在上面的代码中，例如，我想要改变frameLayout的边缘，而frameLayout的视图组是RelativeLayout，所以你需要隐藏到(RelativeLayout. layoutparams)

2015-05-06 09:14:40

其他回答

要直接向项目添加页边距(某些项目允许直接编辑页边距)，您可以执行以下操作:

LayoutParams lp = ((ViewGroup) something).getLayoutParams();
if( lp instanceof MarginLayoutParams )
{
    ((MarginLayoutParams) lp).topMargin = ...;
    ((MarginLayoutParams) lp).leftMargin = ...;
    //... etc
}
else
    Log.e("MyApp", "Attempted to set the margins on a class that doesn't support margins: "+something.getClass().getName() );

.．.这种工作不需要了解/编辑周围的布局。请注意“instanceof”检查，以防您试图对不支持页边距的东西运行此检查。

2013-05-09 11:23:58

/*
 * invalid margin
 */
private void invalidMarginBottom() {
    RelativeLayout.LayoutParams lp = (RelativeLayout.LayoutParams) frameLayoutContent.getLayoutParams();
    lp.setMargins(0, 0, 0, 0);
    frameLayoutContent.setLayoutParams(lp);
}

2015-05-06 09:14:40

 MarginLayoutParams layoutParams = (MarginLayoutParams) getLayoutParams();
 layoutParams.setMargins(leftMargin, topMargin, rightMargin, bottomMargin);

2016-10-20 01:53:11

下面是一些小代码来完成它:

LinearLayout ll = new LinearLayout(this);
ll.setOrientation(LinearLayout.VERTICAL);

LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
     LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);

layoutParams.setMargins(30, 20, 30, 0);

Button okButton=new Button(this);
okButton.setText("some text");
ll.addView(okButton, layoutParams);

2010-06-09 00:22:18

核心-KTX：

 updateLayoutParams<RecyclerView.LayoutParams> {
                topMargin = 10
                rightMargin = 10
                bottomMargin = 10
                leftMargin = resources.getDimensionPixelSize(R.dimen.left)
            }

而不是RecycleView，使用任何视图在ViewGroup。

2021-07-28 13:55:02

在线性布局中以编程方式设置边距

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