Why LinearLayout's margin is being ignored if used as ListView row view
android
Solution
The fact is that, the margin of `LinearLayout` (child) asks its parent layout (container) to give child layout a margin of x value.
So if the parent layouts' LayoutParams support the margins then that margin is honored and applied.
`ListView` uses `AbsListView.LayoutParams` by default, which doesn't include any margin support, just the height and width, thats why, it simply ignores the params value for margins.
Whereas other layout params like `ActionBar.LayoutParams`, `FrameLayout.LayoutParams`, `GridLayout.LayoutParams`, `LinearLayout.LayoutParams` and `RelativeLayout.LayoutParams` are child of ViewGroup.MarginLayoutParams, which honors the child's margin values.
Problem
I was wondering, if I merely provide a single layer of `LinearLayout` as ListView's row view, its margin will be ignored. Margin will be ignored if used of ListView's row view ``` <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_marginLeft="5dp" ``` However, if I provide double layer of `LinearLayout`, with first layer acted as "dummy" layer, its margin will not be ignored. We will have margin in ListView's row view ``` <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/buyPortfolioLinearLayout" android:layout_width="match_parent" android:layout_height="match_parent"> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:layout_marginLeft="5dp" ``` May I know why it happen so?