Android keyDispatchingTimedOut problem

In my android application i am implementing map functionality. it has a tab bar when i jump one activity to another activity through tab its working perfectly. but when i come on map activity and try to move from it through "Back key of device" the entire application freezes and after a couple of seconds I get the dreaded force close dialog appearing and i got error.

11-11 10:53:26.083: ERROR/ActivityManager(85): ANR in com.project.activity 
(com.project.activity/.MapActivity)
11-11 10:53:26.083: ERROR/ActivityManager(85): Reason: keyDispatchingTimedOut
11-11 10:53:26.083: ERROR/ActivityManager(85): Load: 2.64 / 1.75 / 1.64
11-11 10:53:26.083: ERROR/ActivityManager(85): CPU usage from 8749ms to 209ms ago:
11-11 10:53:26.083: ERROR/ActivityManager(85):   dianic.activity: 18% = 16% user + 1%  kernel开发者_Go百科 / faults: 1938 minor
11-11 10:53:26.083: ERROR/ActivityManager(85):   mediaserver: 14% = 14% user + 0% kernel
11-11 10:53:26.083: ERROR/ActivityManager(85):   system_server: 4% = 2% user + 1% kernel / faults: 167 minor
11-11 10:53:26.083: ERROR/ActivityManager(85):   dhd_dpc: 1% = 0% user + 1% kernel
11-11 10:53:26.083: ERROR/ActivityManager(85):   android.vending: 0% = 0% user + 0% kernel / faults: 57 minor
11-11 10:53:26.083: ERROR/ActivityManager(85):   synaptics_wq: 0% = 0% user + 0% kernel
11-11 10:53:26.083: ERROR/ActivityManager(85):   e.process.gapps: 0% = 0% user + 0% kernel / faults: 3 minor
11-11 10:53:26.083: ERROR/ActivityManager(85):   wpa_supplicant: 0% = 0% user + 0% kernel
11-11 10:53:26.083: ERROR/ActivityManager(85):   logcat: 0% = 0% user + 0% kernel
11-11 10:53:26.083: ERROR/ActivityManager(85): TOTAL: 41% = 36% user + 5% kernel + 0% softirq

please guide me why this is occurring.. thanks in advance

This type of problem occur when code get window leak type of problem or when we try to perform many operation on same activity...