how to give Edittext and button to half of the screen width?

[shawn peter]

below is my login screen.I need to give both EditText and Button to take half of the screen width.can we archive this using weight ?unless i have to give margin values specifically for each type of screens(small,large,...)?

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/parentView"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@drawable/mobiback2"
    android:orientation="vertical" >

    <ScrollView
        android:id="@+id/signinScroll"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:fillViewport="true"
        android:orientation="vertical" >

        <RelativeLayout
            android:id="@+id/tapView_Signin"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:orientation="vertical" >

            <TextView
                android:id="@+id/imageView1"
                android:layout_width="fill_parent"
                android:layout_height="100dp"
                android:layout_alignParentTop="true"
                android:layout_centerHorizontal="true"
                android:layout_marginTop="44dp"
                android:gravity="center"
                android:text="Scheduler"
                android:textSize="60dp"
                 android:textColor="#FFFFFF"
                android:textStyle="bold|italic"
                 />

            <LinearLayout
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_alignParentLeft="true"
                android:layout_below="@+id/imageView1"
                android:layout_marginTop="120dp"
                android:orientation="vertical"
                android:padding="20dp" >

                <EditText
                    android:id="@+id/ETEmail"
                    android:layout_width="match_parent"
                   
                    android:layout_marginBottom="15dp"
                    android:layout_marginLeft="90dp"
                    android:layout_marginRight="90dp"
                     android:layout_height="100dp"
                    android:drawablePadding="10dp"
                    android:hint="Username"
                    android:imeOptions="actionNext"
                    android:inputType="text"
                    android:padding="10dp"
                    android:singleLine="true" >
                </EditText>

                <EditText
                    android:id="@+id/ETPassword"
                    android:layout_width="match_parent"
                   
                    android:layout_marginBottom="25dp"
                     android:layout_marginLeft="90dp"
                    android:layout_marginRight="90dp"
                     android:layout_height="100dp"
                    android:drawablePadding="10dp"
                    android:hint="Password"
                    android:imeOptions="actionDone"
                    android:inputType="textPassword"
                    android:padding="10dp"
                    android:singleLine="true" />

                <Button
                    android:id="@+id/btnLogin"
                    android:layout_width="match_parent"
                    android:layout_height="100dp"
                    android:layout_marginLeft="90dp"
                    android:layout_marginRight="90dp"
                    android:text="Sign In"
                      android:textColor="#FFFFFF"
                    android:textSize="20sp" />
            </LinearLayout>
        </RelativeLayout>
    </ScrollView>

</RelativeLayout>

[Steve Luke]

Weights only work with LinearLayout. For a perfect 50/50 split in a RelativeLayout you can put a view centered in the layout, then put your views to the left and right of the strut. Something like this:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <View
        android:id="@+id/spacer"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true" />

    <TextView
        android:id="@+id/left"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_margin="0dp"
        android:layout_toLeftOf="@+id/spacer"
        android:background="#ff8844"
        android:gravity="center"
        android:padding="8dp"
        android:text="Left"
        android:textSize="18sp" />

    <TextView
        android:id="@+id/right"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:layout_margin="0dp"
        android:layout_toRightOf="@+id/left"
        android:background="#ccff44"
        android:gravity="center"
        android:padding="8dp"
        android:text="Right"
        android:textSize="18sp" />
</RelativeLayout>

You can adjust the spacing more or less than 50/50 by putting a left margin on the space. Example:

    <View
        android:id="@+id/spacer"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginLeft="30dp" />

    <View
        android:id="@+id/spacer"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginLeft="-30dp" />

[shawn peter]

Thanks Steve