从linearLayout中的按钮删除侧面间距

Question

I have this layout designed so far

Notice the side space around both the buttons with the name "save" that I have marked with red color, I want to remove that extra spacing.

Both the buttons are wrapped inside linearlayout with orientation set to "vertical", I tried using layout_weight, marginLeft and marginRight but no success.

Here's how the xml code looks like only for the buttons inside the linearlayout

 <LinearLayout
        android:id="@+id/buttonSection"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"

        >
        <!--This layout is for save and change currency buttons-->


        <Button
             android:id="@+id/saveButton"
             android:layout_width="fill_parent"
             android:layout_height="wrap_content"
             android:text="Save"
             android:layout_weight="1"
          />

         <Button
             android:id="@+id/currencyButton"
             android:layout_width="fill_parent"
             android:layout_height="wrap_content"
             android:text="Save"
             android:layout_weight="1"
         />
    </LinearLayout>

Just for extra information the above linearlayout is wrapped inside one more linearlayout which controls the layout of full activity

EDIT

Full code for the main activity xml file

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent"
    android:layout_height="match_parent"

    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:background="@drawable/layer_list"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:showIn="@layout/activity_main"
    tools:context=".MainActivity"
    android:orientation="vertical"
    android:weightSum="5"
    >

    <LinearLayout
        android:id="@+id/layout1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_weight="2"
        android:paddingTop="10dp"
        android:layout_marginBottom="30dp"
        >

        <LinearLayout
            android:id="@+id/leftCurrencySection"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="left"
            android:layout_weight="1"
            android:orientation="vertical"

            >

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="GBP"
                android:textSize="30dp"
                android:textColor="#ffffff"
                android:textAllCaps="true"
                android:textStyle="bold"
                />

            <EditText
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="0.00"
                android:textSize="30dp"
                android:textColor="#ffffff"
                android:textAllCaps="true"
                android:textStyle="bold"
                android:background="@null"
                />

        </LinearLayout>

        <LinearLayout
            android:id="@+id/rightCurrencySection"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="right"
            android:layout_weight="1"
            android:orientation="vertical">

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="right"
                android:text="USD"
                android:textSize="30dp"
                android:textColor="#ffffff"
                android:textAllCaps="true"
                android:textStyle="bold"
                />

            <EditText
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="right"
                android:text="0.00"
                android:textSize="30dp"
                android:textColor="#ffffff"
                android:textAllCaps="true"
                android:textStyle="bold"
                android:background="@null"
                />

        </LinearLayout>

    </LinearLayout>
    <!--End of This layout is for typing currency values-->

    <LinearLayout
        android:id="@+id/buttonSection"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"

        >
        <!--This layout is for save and change currency buttons-->


            <Button
                android:id="@+id/saveButton"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:text="Save"
                android:layout_weight="1"
                />

                <Button
                    android:id="@+id/currencyButton"
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:text="Save"
                    android:layout_weight="1"
                    />
    </LinearLayout>
    <!--End of  save and change currency buttons-->

    <!--Begin Layout for calculator begin-->

    <GridLayout 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:columnCount="3"
        android:layout_gravity="center"
        android:orientation="horizontal"
        android:layout_weight="1"
        >


        <Button android:text="1"

            />

        <Button android:text="2" />

        <Button android:text="3" />



        <Button android:text="4" />

        <Button android:text="5" />

        <Button android:text="6" />



        <Button android:text="7" />

        <Button android:text="8" />

        <Button android:text="9" />


        <Button android:text="." />

        <Button android:text="0" />

        <Button android:text="Del" />


    </GridLayout>
    <!--End Layout for calculator-->
    <!--End Layout for calculator End-->


</LinearLayout>

Answer 1

There are many people to thanks over here, who pointed out my mistake and also guided me to correct way of removing that extra space from either sides of the button.

First I had to remove the padding from my parent linearlayout. I removed paddingLeft and PaddingRight. Which removed the major part of the space. Thanks to cricket_007 for pointing this out.

Even after removing the space there was still a bit of space left out like 1 or 2dp. This was apparently due to some default styling in android as pointed out by Doug Stevenson .

To remove this last form of space, I had to apply some sort of background mentioned by eclipse for example android:background="#00ff00"

Applying the above attribute removed that extra space, this is due to 9patch in android. Learn more about it over here.