Click debug button, the execution will stop at the breakpoint.Click the column at the beginning of the code line to set a breakpoint. After clicking the java file link beside the exception in logcat window, you can go to the error happened source code.If you feel the logcat window is not big enough, you can click the settings icon at the top right corner in the Android Monitor window, then click ” Resize -> Maximize Tool Window ” to maximize the logcat window.Caused by: : Attempt to invoke virtual method 'void ($OnClickListener)' on a null object referenceĪt .SwitchScreenActivity1.onCreate(SwitchScreenActivity1.java:26) You may find there is a, you can click the java file link in the logcat window to navigate to the source code where the exception happened. Click the Run button in the android studio top toolbar to run the application again, a lot of messages will be shown in the logcat window.Please make sure you choose the “ Warn” and “ No Filters” selection in the logcat tab as below.
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