android - How to remove default layout's padding/margin

Question

I have the following layout files:

activity_main.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:map="http://schemas.android.com/apk/res-auto"
    android:id="@+id/frame_container"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_marginLeft="0px"
    android:layout_marginRight="0px"
    android:layout_marginTop="0px"
    android:padding="0dp"
    >
    ...
</FrameLayout>

And some other fragments like

fragment_init.xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/fragmentInit"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:padding="0dp"
    android:layout_marginTop="0px"
    android:layout_marginLeft="0px"
    android:layout_marginRight="0px"
    android:background="#549F07"
    >

    <TextView
        ... 
    >
    ...
</RelativeLayout>

Everything looks fine in Lint, but when I execute my application on my Nexus 7 5.0.2, every container is displayed with a padding or margin of maybe 10 px.

This is illustrated by the arrows on the following image

How to force the layouts to not add these padding/margin?

Edit: I should add how I insert my fragment.

Activiy

 public class MainActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();
        fragmentTransaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
        fragmentTransaction.replace(R.id.frame_container, new Fragment_init(), "Fragment_init").commit();
    }
}

and I don't use any dimens anywhere... Thks

Answer 1

Go into this file res/values/dimens.xml and change the values to 0dp just like in the code below.

<dimen name="activity_horizontal_margin">0dp</dimen>
<dimen name="activity_vertical_margin">0dp</dimen>