Drawing a background make my app slow

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http://stackoverflow.com – I am trying to make a very simple game. The user has to try to catch an apple using a basket moved by his finger. Everything seems to work pretty well, but I have a problem: I want to draw a background for the app. But using an image as backgorund makes the app extremely slow and causes a lot of lag. If I use White Background I have no problems. Can somebody tell me what I am doing wrong? I think it is because I draw the background everytime the app updates, but I don't know any way to change this. Maybe my code is a bit confusional, I am still learning. Thanks for the help! package com.c (HowTos)