java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.yjlove/com.example.yjlove.MainActivity}: java.lang.NullPointerException

androidhuman.com | 6 months ago
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    커니의 안드로이드 이야기 :: Media Player를 이용한 음악 재생 어플리케이션 만들어보기 (2)

    androidhuman.com | 6 months ago
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.yjlove/com.example.yjlove.MainActivity}: java.lang.NullPointerException

    Root Cause Analysis

    1. java.lang.NullPointerException

      No message provided

      at com.example.yjlove.MainActivity.updateSongList()
    2. com.example.yjlove
      MainActivity.onCreate
      1. com.example.yjlove.MainActivity.updateSongList(MainActivity.java:36)
      2. com.example.yjlove.MainActivity.onCreate(MainActivity.java:31)
      2 frames
    3. Android Platform
      ActivityThread.main
      1. android.app.Activity.performCreate(Activity.java:4465)
      2. android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
      3. android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
      4. android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
      5. android.app.ActivityThread.access$600(ActivityThread.java:123)
      6. android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
      7. android.os.Handler.dispatchMessage(Handler.java:99)
      8. android.os.Looper.loop(Looper.java:137)
      9. android.app.ActivityThread.main(ActivityThread.java:4424)
      9 frames
    4. Java RT
      Method.invoke
      1. java.lang.reflect.Method.invokeNative(Native Method)
      2. java.lang.reflect.Method.invoke(Method.java:511)
      2 frames
    5. Android
      ZygoteInit.main
      1. com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
      2. com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
      2 frames
    6. Android Platform
      NativeStart.main
      1. dalvik.system.NativeStart.main(Native Method)
      1 frame