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[Q] Understanding logcat

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I am trying to implement some modes in my android phone, but it always gives FC. I tried to get logcat using adb but it gives some lines with F declare, but I don't understand it, and how to locate which part I made wrong..

Here is an example:
Code:

F/SystemServer( 1804): java.lang.UnsatisfiedLinkError: nativeHasExternalAlphakey
F/SystemServer( 1804):  at com.android.server.wm.InputManager.nativeHasExternalAlphakey(Native Method)
F/SystemServer( 1804):  at com.android.server.wm.InputManager.hasExternalAlphakey(InputManager.java:502)
F/SystemServer( 1804):  at com.android.server.wm.WindowManagerService.computeNewConfigurationLocked(WindowManagerService.java:6113)
F/SystemServer( 1804):  at com.android.server.wm.WindowManagerService.computeNewConfigurationLocked(WindowManagerService.java:5865)
F/SystemServer( 1804):  at com.android.server.wm.WindowManagerService.computeNewConfiguration(WindowManagerService.java:5852)
F/SystemServer( 1804):  at com.android.server.am.ActivityManagerService.updateConfiguration(ActivityManagerService.java:13463)
F/SystemServer( 1804):  at com.android.server.wm.WindowManagerService.displayReady(WindowManagerService.java:6466)

Could any one help me to understand this logcat? every part of it?

Thanks in advance...

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