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);

从xml到任何地方，

android:layout_marginLeft="135dp"

可能是什么原因？ 我错过了什么！

-thnx

Answer 1

尝试这个：

params.gravity = Gravity.TOP;

Answer 2

我有一个RelativeLayout的FrameLayout子元素，因此框架试图将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

我认为您所缺少的是，当您以编程方式设置元素的参数时，这些参数实际上提供给了父视图，因此它知道如何定位元素。 参数未设置回元素本身。 考虑下面的代码示例。 还要注意，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);

Answer 4

你可以试试这个

FrameLayout.LayoutParams srcLp = (FrameLayout.LayoutParams)searchPin.getLayoutParams();
FrameLayout.LayoutParams lp = new FrameLayout.LayoutParams(srcLp.width, srcLp.height, srcLp.gravity);

lp.setMargins(srcLp.leftMargin, srcLp.topMargin, srcLp.rightMargin, srcLp.bottomMargin);

searchPin.setLayoutParams(lp);

Answer 5

简单的解决方案-

searchPin = (ImageView) findViewById(R.id.waypts_search_pin);
searchPin.setPadding(135, 176, 0, 0);

Answer 6

只需使用LayoutParams而不是FrameLayout.LayoutParams

LayoutParams params = (LayoutParams) searchPin.getLayoutParams();
params.setMargins(135, 176, 0, 0);
searchPin.setLayoutParams(params);

这对我有用