Android:以编程方式在FrameLayout中设置边距 - 不起作用

Question

这是代码 -

FrameLayout.LayoutParams params = (FrameLayout.LayoutParams) searchPin.getLayoutParams();
params.setMargins(135, 176, 0, 0);
//params.leftMargin = 135; // also not worked 
//params.topMargin = 376;
searchPin.setLayoutParams(params);

无论如何,从xml开始工作 -

android:layout_marginLeft="135dp"

可能是什么原因？我错过了什么!

-thnx

Answer 1

试试这个:

params.gravity = Gravity.TOP;

Answer 2

我有一个RelativeLayout的FrameLayout子项,所以框架试图将FrameLayout参数转换为RelativeLayout,我这样解决了

FrameLayout mylayout = (FrameLayout) view.findViewById(R.id.mylayout);
ViewGroup.MarginLayoutParams params = (MarginLayoutParams) mylayout.getLayoutParams();
params.setMargins(1, 2, 3, 4);
mylayout.setLayoutParams(params);

Answer 3

我认为您缺少的是，当您以编程方式设置元素的参数时，这些参数实际上会提供给父视图，以便它知道如何定位该元素。参数不会设置回元素本身。考虑以下代码示例。另请注意，布局参数是父级的类型。

LinearLayout linearLayout = new LinearLayout(this);

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

layoutParams.setMargins(6,6,6,6);

Button someButton=new Button(this);
someButton.setText("some text");

linearLayout.addView(someButton, layoutParams);