java.lang.RuntimeException

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  • NullPointerException when using layout
    via Stack Overflow by Pedro Daumas
    ,
    • java.lang.RuntimeException: Unable to start activity ComponentInfo{br.com.pedro.pedrodaumas/br.com.pedro.pedrodaumas.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAdapter(android.widget.ListAdapter)' on a null object reference at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2697) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2771) at android.app.ActivityThread.access$900(ActivityThread.java:177) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1432) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5912) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1405) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1200) Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAdapter(android.widget.ListAdapter)' on a null object reference at br.com.pedro.pedrodaumas.MainActivity.onCreate(MainActivity.java:44) at android.app.Activity.performCreate(Activity.java:6178) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2650)
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