Align controls in the center of screen

Question

I have controls that I want to center them on the center of screen so I used the following code

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:gravity="center_vertical|center_horizontal"
    android:background="#DDDDDD">
    <TextView
        android:id="@+id/tv_un"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="10pt"
        android:textColor="#444444"

        android:layout_marginRight="9dip"
        android:layout_marginTop="20dip"
        android:layout_marginLeft="10dip"

        android:text="User Name:"/>
    <EditText
        android:id="@+id/et_un"
        android:layout_width="150dip"
        android:layout_height="wrap_content"
        android:background="@android:drawable/editbox_background"
        android:layout_toRightOf="@id/tv_un"

        android:layout_alignTop="@id/tv_un"/>
     <TextView
        android:id="@+id/tv_pw"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="10pt"
        android:textColor="#444444"

        android:layout_below="@id/tv_un"
        android:layout_marginRight="9dip"
        android:layout_marginTop="15dip"
        android:layout_marginLeft="10dip"

        android:text="Password:"/>
    <EditText
        android:id="@+id/et_pw"
        android:layout_width="150dip"
        android:layout_height="wrap_content"
        android:background="@android:drawable/editbox_background"
        android:layout_toRightOf="@id/tv_pw"
        android:layout_alignTop="@id/tv_pw"
        android:layout_below="@id/et_un"
        android:layout_marginLeft="17dip"

        android:password="true"        />
    <Button
        android:id="@+id/btn_login"
        android:layout_width="100dip"
        android:layout_height="wrap_content"
        android:layout_below="@id/et_pw"

        android:layout_marginTop="15dip"
        android:layout_marginLeft="110dip"

        android:text="Login" />
     <TextView
        android:id="@+id/tv_error"
        android:layout_width="fill_parent"
        android:layout_height="40dip"
        android:textSize="7pt"

        android:layout_below="@id/btn_login"
        android:layout_marginRight="9dip"
        android:layout_marginTop="15dip"
        android:layout_marginLeft="15dip"
        android:textColor="#AA0000"

        android:text=""/>
</RelativeLayout>

but the output became as the following image

any idea how to center them regardless the orientation of the screen

Best regards

Answer 1

Try android:layout_centerInParent = "true" This can solve your issue.. You can apply this attribute to any element you want to display in the center of the screen.

Answer 2

edited your code

here it is

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_centerHorizontal="true"
android:background="#DDDDDD"
android:gravity="center_vertical|center_horizontal" >

<LinearLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerInParent="true"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <TextView
            android:id="@+id/tv_un"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="User Name:"
            android:textColor="#444444"
            android:textSize="10pt" />

        <EditText
            android:id="@+id/et_un"
            android:layout_width="150dip"
            android:layout_height="wrap_content"
            android:layout_alignTop="@id/tv_un"
            android:layout_toRightOf="@id/tv_un"
            android:background="@android:drawable/editbox_background" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <TextView
            android:id="@+id/tv_pw"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@id/tv_un"
            android:text="Password:"
            android:textColor="#444444"
            android:textSize="10pt" />

        <EditText
            android:id="@+id/et_pw"
            android:layout_width="150dip"
            android:layout_height="wrap_content"
            android:layout_alignTop="@id/tv_pw"
            android:layout_below="@id/et_un"
            android:layout_marginLeft="17dip"
            android:layout_toRightOf="@id/tv_pw"
            android:background="@android:drawable/editbox_background"
            android:password="true" />
    </LinearLayout>

    <Button
        android:id="@+id/btn_login"
        android:layout_width="100dip"
        android:layout_height="wrap_content"
        android:layout_below="@id/et_pw"
        android:layout_marginLeft="110dip"
        android:layout_marginTop="15dip"
        android:text="Login" />

    <TextView
        android:id="@+id/tv_error"
        android:layout_width="fill_parent"
        android:layout_height="40dip"
        android:layout_below="@id/btn_login"
        android:layout_marginLeft="15dip"
        android:layout_marginRight="9dip"
        android:layout_marginTop="15dip"
        android:text=""
        android:textColor="#AA0000"
        android:textSize="7pt" />
</LinearLayout>