Why Activity page jump will stop running

            


Eclipse which was built between the several interface which has a jump jump to be wrong, the program runs without error, the rest of the interface jump normal, you will go wrong, stop running jump to this screen, under the guidance of experts who have Rookie! ! ! Also ask, Does anyone know how to MapGis map data posted on google map call together? ? Thank
Logcat display:


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I guess it is a null pointer Han
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The problem here:
Caused by: java.lang.NullPointerException
at com.example.wu.activity.onCreate (activity.java:20)
Com.example.wu.activity.onCreate you look at the first 20 lines of code what is wrong?
Is not an object and line 20 is not relevant to initialize
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Code did not seem to display an error ah, that activity interface code below, I also want to take a look at the Supreme ah,

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J1 seemingly empty, and look at the configuration file, j1 configuration is not what id or wrong
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The monitor should be okay and j1, j1, j2, j3 three listeners are into this interface will be some jump button, now the key is listening from another interface not the interface button to jump ah! ! !
Starting with the jump, and later because the button more, in order to manage the buttons I have modified the name under ,,, then there is this problem ,,
I then R.java posted, then trouble you to look ,, participated in the development of competition, what they do not learn by doing! !

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I have encountered this problem, I do not know the Editor's Note ah
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Members seeking answers to the great God
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Ah, I know. I have an activity to jump in AndroidManifest not registered, so hop on to that activity, it stopped abnormally.
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8th floor so right, a little problem for the novice enough for you to drink a pot, thanks thanks, finally know where the problem lies