To place in  a relative layout is very esay. You can place to use two properties

android:layout_alignParent
android:layout_center

If you want to do this, just follow this code

<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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".TheDeveloperWorldIsYoursActivity" >

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_centerVertical="true"
        android:text="@string/left" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:text="@string/leftTop" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:text="@string/leftBottom" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true"
        android:text="@string/right" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:text="@string/rightTop" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:text="@string/rightBottom" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:text="@string/center" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:text="@string/centerTop" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:text="@string/centerBottom" />

</RelativeLayout>

Here I will show you how to make an animation image in Android.

It is very easy to make a animation image in background.
The first thing you need is to create a image view in your layout.

<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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".TheDeveloperWorldIsYours" >
    <ImageView android:id="@+id/iv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/iv"/>

</RelativeLayout>

The most import line code is

final Handler handler = new Handler();
final Runnable r = new Runnable(){
      public void run(){};
}

a Handler, a Runnable and a run.

package com.thedeveloperworldisyours.animationimagen;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.widget.ImageView;

public class TheDeveloperWorldIsYours extends Activity {

	private static ImageView iv;

	final Handler handler = new Handler();
	Runnable r;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_the_developer_world_is_yours);

		iv = (ImageView) findViewById(R.id.iv);

		r = new Runnable()
		{
			int x = 1;
		    public void run()
		    {

		        switch(x) {
				 case 1:
					 iv.setImageResource(R.drawable.base1);
				     break;
				 case 2:
					 iv.setImageResource(R.drawable.base2);
				     break;
				 case 3:
					 iv.setImageResource(R.drawable.base3);
				     break;
				 case 4:
					 iv.setImageResource(R.drawable.base4);
				     break;
				 case 5:
					 iv.setImageResource(R.drawable.base5);
				     break;
				 case 6:
					 iv.setImageResource(R.drawable.base6);
				     break;
				 case 7:
					 iv.setImageResource(R.drawable.base7);
				     break;
				 case 8:
					 iv.setImageResource(R.drawable.base8);
				     break;
				 case 9:
					 iv.setImageResource(R.drawable.base9);
				     break;
				 default:
					 iv.setImageResource(R.drawable.base);
				     break;
				 }
		        if(x==9)
		        	x=1;
		        else
		        	x++;
		        handler.postDelayed(this, 1000);

		    }
		};

		handler.postDelayed(r, 1000);
	}

	@Override
	protected void onPause() {
		// TODO Auto-generated method stub
		handler.removeCallbacks(r);
		super.onPause();
	}

}

In android you can control the view in any away.
A way is with inflater

// Inflate the popup_layout.xml
            LinearLayout viewGroup = (LinearLayout) context
                            .findViewById(R.id.popupLinearLayout);
            LayoutInflater layoutInflater = (LayoutInflater) context
                            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            View layout = layoutInflater.inflate(R.layout.activity_popup, viewGroup);

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First step is animation. One for enter and other for exit.

res/anim/enter.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:interpolator="@android:anim/decelerate_interpolator" >

    <scale
        android:duration="1000"
        android:pivotX="50%"
        android:pivotY="50%"
        android:toXScale="1.0"
        android:toYScale="1.0" />

    <alpha
        android:duration="2000"
        android:fromAlpha="0.0"
        android:startOffset="500"
        android:toAlpha="1.0" />
</set>

res/anim/exit.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >

    <alpha
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:duration="1000"
        android:fillAfter="true"
        android:fromAlpha="1.0"
        android:toAlpha="0" />

</set>

Second step: These animations are item in PopupWindowAnimation style.

res/values/styles.xml

<resources>

    <style name="AppBaseTheme" parent="android:Theme.Light"></style>

    <!-- Application theme. -->
    <style name="AppTheme" parent="AppBaseTheme"></style>

    <style name="PopupWindowAnimation" parent="android:Animation">
        <item name="android:windowEnterAnimation">@anim/enter</item>
        <item name="android:windowExitAnimation">@anim/exit</item>
    </style>

</resources>

you create the layout with button which show the popup.

res/layout/activity_the_developer_world_is_yours.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical" >

    <Button
        android:id="@+id/open"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Show popup" />

</LinearLayout>

Now you create the layout of popup.

res/layout/popup_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/popupLinearLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/colorPopUp"
    android:gravity="center"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@color/colorPopUpMarcoWindow"
        android:gravity="center"
        android:orientation="vertical" >

        <Button
            android:id="@+id/close"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="right"
            android:layout_marginRight="5dp"
            android:background="@color/colorPopUpMarcoWindow"
            android:text="@string/closebutton" />

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="5dp"
            android:layout_marginLeft="5dp"
            android:layout_marginRight="5dp"
            android:background="@color/colorPopUpWindow"
            android:gravity="center"
            android:orientation="vertical" >

            <TextView
                android:id="@+id/textView1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Popup"
                android:textColor="@color/colorPopUpMarcoWindow" />

            <ImageButton
                android:id="@+id/imageButton1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:src="@drawable/octopus_cat" />

            <TextView
                android:id="@+id/textView2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="5dp"
                android:text="This is a simple popup"
                android:textColor="@color/colorPopUpMarcoWindow" />
        </LinearLayout>
    </LinearLayout>

</LinearLayout>

res/values/strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">PopUpAndroid</string>
    <string name="title_activity_the_developer_world_is_yours">TheDeveloperWorldIsYours</string>
    <string name="action_settings">Settings</string>
    <string name="closebutton">Close [x]</string>

    <color name="colorPopUp">#BB000000</color>
    <color name="colorPopUpWindow">#000000</color>
    <color name="colorPopUpMarcoWindow">#FFFFFF</color>

</resources>

In conclusion, you create the main class. In this class you create a inflater for show popup.

src/TheDeveloperWorldIsYoursActivity.java

package com.thedeveloperworldisyours.popup;

import android.app.Activity;
import android.content.Context;
import android.graphics.Point;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.view.Display;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.PopupWindow;

public class TheDeveloperWorldIsYours extends Activity {
	private Point p;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_the_developer_world_is_yours);
        Button popUpButton = (Button) findViewById(R.id.open);
        popUpButton.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View arg0) {
				// TODO Auto-generated method stub
				if (p !=null)
				showPopup(TheDeveloperWorldIsYours.this, p);
			}
		});

    }
    @Override
    public void onWindowFocusChanged(boolean hasFocus) {
            int[] location = new int[2];
            Button button = (Button) findViewById(R.id.open);

            button.getLocationOnScreen(location);
            // Initialize the Point with x, and y positions
            p = new Point();
            p.x = location[0];
            p.y = location[1];

    }
 // The method that displays the popup.

    private void showPopup(final Activity context, Point p) {

            Rect rectgle= new Rect();
            Window window= getWindow();
            window.getDecorView().getWindowVisibleDisplayFrame(rectgle);
            int StatusBarHeight= rectgle.top;
            int contentViewTop=
                window.findViewById(Window.ID_ANDROID_CONTENT).getTop();
            int TitleBarHeight= contentViewTop - StatusBarHeight;
            Display display = ((WindowManager) getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
            int popupWidth = display.getWidth();
            int popupHeight = (display.getHeight()-StatusBarHeight);

            // Inflate the popup_layout.xml
            LinearLayout viewGroup = (LinearLayout) context
                            .findViewById(R.id.popupLinearLayout);
            LayoutInflater layoutInflater = (LayoutInflater) context
                            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            View layout = layoutInflater.inflate(R.layout.activity_popup, viewGroup);

            // Creating the PopupWindow
            final PopupWindow popup = new PopupWindow(context);
            popup.setContentView(layout);
            popup.setWidth(popupWidth);
            popup.setHeight(popupHeight);
            popup.setFocusable(true);
            popup.setAnimationStyle(R.style.PopupWindowAnimation);

            // Some offset to align the popup a bit to the right, and a bit down,
            // relative to button's position.

            int OFFSET_X = 0;
            int OFFSET_Y = 0;
            // Clear the default translucent background
            popup.setBackgroundDrawable(new BitmapDrawable());
            // Displaying the popup at the specified location, + offsets.
            popup.showAtLocation(layout, Gravity.NO_GRAVITY, p.x + OFFSET_X, p.y
                            + OFFSET_Y);

            // Getting a reference to Close button, and close the popup when
            // clicked.
            Button close = (Button) layout.findViewById(R.id.close);
            close.setOnClickListener(new OnClickListener() {
                    @Override
                    public void onClick(View v) {
                            popup.dismiss();
                    }
            });

    }

}

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It’s very easy. The most important line of code is:

setContentView(myLInearLayout);

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First step, remove layout.xml. Then in your main class you can programmatically add a LinearLayout, RelativeLayout… a example:

package com.thedeveloperworldisyours.withoutlayout;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;

public class TheDeveloperWorldIsYours extends Activity {

	private TextView valueTV;
	private Button valueB;
	private TextView valueRelativeLayoutTV;
	private Button valueRelativeLayoutB;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		//create LInearLayout
		LinearLayout myLInearLayout = new LinearLayout(getApplicationContext());

		//add LayoutParams
		LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
		myLInearLayout.setOrientation(LinearLayout.VERTICAL);

		//set Content View
		setContentView(myLInearLayout);

		//add textView
		valueTV = new TextView(this);
		valueTV.setText("LinearLayout");
		valueTV.setId(5);
		valueTV.setLayoutParams(params);

		// add Button
		valueB = new Button(this);
		valueB.setText("RelativeLayout");
		valueB.setId(5);

		//add the textView and the Button to LinearLayout
		myLInearLayout.addView(valueTV);
		myLInearLayout.addView(valueB);

		valueB.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub

				// add Button
        		valueRelativeLayoutB = new Button(getApplicationContext());
        		valueRelativeLayoutB.setText("RelativeLayout");
        		valueRelativeLayoutB.setId(5);

        		//add RelativeLayout
				RelativeLayout mainLayout = new RelativeLayout(getApplicationContext());
                RelativeLayout.LayoutParams lyp = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.MATCH_PARENT);
                mainLayout.setLayoutParams(lyp);

                //android:layout_below
        		lyp.addRule(RelativeLayout.BELOW, valueRelativeLayoutB.getId());
        		v.setLayoutParams(lyp);

        		//The most important line
        		setContentView(mainLayout);

              //add textView
                valueRelativeLayoutTV = new TextView(getApplicationContext());
        		valueRelativeLayoutTV.setText("RelativeLayout");
        		valueRelativeLayoutTV.setId(5);
        		valueRelativeLayoutTV.setLayoutParams(lyp);

        		mainLayout.addView(valueRelativeLayoutTV);
        		mainLayout.addView(valueRelativeLayoutB);

        		valueRelativeLayoutB.setOnClickListener(new OnClickListener() {

					@Override
					public void onClick(View v) {
						// TODO Auto-generated method stub
						//Exit app
						System.exit(0);
					}
				});

			}
		});

	}

}

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