A custom android drawable to draw bubble shape. Used in http://play.google.com/store/apps/details?id=com.webileapps.resolutiontweet

BubbleBackgroundDrawableDemo.java

package com.webile.demo;

import android.app.Activity;
import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Path;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.widget.RelativeLayout;

public class BubbleBackgroundDemoActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        RelativeLayout relativeLayout = new RelativeLayout(this);
        relativeLayout.setBackgroundDrawable(new Drawable() {
			
        	private static final int OFFSET = 15;
        	Paint whitePaint = new android.graphics.Paint();
			@Override
			public void setColorFilter(ColorFilter cf) {
				// TODO Auto-generated method stub
				
			}
			
			@Override
			public void setAlpha(int alpha) {
				// TODO Auto-generated method stub
				
			}
			
			@Override
			public int getOpacity() {
				// TODO Auto-generated method stub
				return android.graphics.PixelFormat.OPAQUE;
			}
			
			@Override
			public void draw(Canvas canvas) {
				 Rect r = getBounds();
				 RectF rect = new RectF(r);
				 rect.inset(OFFSET, OFFSET);
				 
				 //Build a path
				 Path path = new Path();

				 //up arrow
				 path.moveTo(OFFSET, OFFSET);
				 path.lineTo(OFFSET * 2, 0);
				 path.lineTo(OFFSET * 3, OFFSET);
				 
				 //top horizontal line.
				 path.lineTo(r.width() - OFFSET, OFFSET);
				 
				 //top right arc
				 path.arcTo(new RectF(r.right - OFFSET*2, OFFSET, r.right, OFFSET*3), 270, 90);
				 
				 //right vertical line.
				 path.lineTo(r.width(), r.height()-OFFSET);
				 
				 //bottom right arc.
				 path.arcTo(new RectF(r.right - OFFSET * 2, r.bottom- OFFSET * 2, r.right, r.bottom), 0, 90);
				 
				 //bottom horizontal line.
				 path.lineTo(OFFSET, r.height());
				 
				 //bottom left arc.
				 path.arcTo(new RectF(0, r.bottom- OFFSET * 2, OFFSET * 2, r.bottom), 90, 90);
				 
				 //left horizontal line.
				 path.lineTo(0, OFFSET);
				 
				 //top right arc.
				 path.arcTo(new RectF(0, OFFSET, OFFSET*2, OFFSET*3), 180, 90);
				 
				 
				 path.close();
				 
				 whitePaint.setColor(android.graphics.Color.WHITE);
				 whitePaint.setStyle(Style.FILL);
				 canvas.drawPath(path, whitePaint);
			}
		});
        setContentView(relativeLayout);
    }
}

Hello Rajiv,
Thank you so much for code stuff its help me lot.