android - 在RadioButton上以编程方式设置的边距未应用

我正在尝试为以编程方式添加到RadioGroup的RadioButtons设置边距，但是失败。:RadioButtons已正确添加，但它们的边距为0 ...

有人可以帮忙吗？

布局

<RadioGroup android:id="@+id/rg_nav" android:orientation="vertical"
    android:layout_width="wrap_content" android:layout_height="wrap_content">
</RadioGroup>

Activity

float density = getResources().getDisplayMetrics().density;

rg_nav = (RadioGroup) findViewById(R.id.rg_nav);

LinearLayout.LayoutParams params_rb = new LinearLayout.LayoutParams(
        (int)(8*density),
        (int)(8*density));
int margin = (int)(6*density);
params_rb.setMargins(margin, margin, margin, margin);

for(String url : product.list_url_pic){

    RadioButton radio_btn = new RadioButton(ProductHome.this);
    radio_btn.setButtonDrawable(R.drawable.rb_nav);
    radio_btn.setId(rb_id++);
    rg_nav.addView(radio_btn, params_rb);
}

最佳答案

我不得不更换

LinearLayout.LayoutParams params_rb = new LinearLayout.LayoutParams(
    (int)(8*density),
    (int)(8*density));

经过

RadioGroup.LayoutParams params_rb = new RadioGroup.LayoutParams(
                (int)(8*density),
                (int)(8*density));