hey a lot of peoples download apps on android from google play,android market or etc.....
sometimes we uninstall apps after a short use and if we need it again we download it again.
here i m.telling u to save ur gprs balance and time
here we go......
1. download any app u need from google play or som
ething else
2. let it be install
3. now the main point... download App Monster and install it..
4 .now open it... it will show u all apps which are installed in ur android device
5. now click on any installed app u want to save as i.staller or as apk...afterclick on one choose backup... nd now ur app's backup as apk file created in ur storage .. it will apper as .... memorycad/app monster/ur app name or certificate / rev/ angrybird.apk
6. now open and install angrybird or what u choosen for backup

this is not a trick . it is a methode by which google play links created in bundle as installer


if ur store has no app monster contained .. then u can use any app whick can be take backup