android 中这个错误信息是什么哦哦？

04-05 05:07:09.131: ERROR/vold(27): Error opening switch name path '/sys/class/switch/test2' (No such file or directory)
04-05 05:07:09.131: ERROR/vold(27): Error bootstrapping switch '/sys/class/switch/test2' (No such file or directory)
04-05 05:07:09.131: ERROR/vold(27): Error opening switch name path '/sys/class/switch/test' (No such file or directory)
04-05 05:07:09.131: ERROR/vold(27): Error bootstrapping switch '/sys/class/switch/test' (No such file or directory)
04-05 05:07:20.091: ERROR/MemoryHeapBase(52): error opening /dev/pmem: No such file or directory
04-05 05:07:20.091: ERROR/SurfaceFlinger(52): Couldn't open /sys/power/wait_for_fb_sleep or /sys/power/wait_for_fb_wake
04-05 05:07:20.191: ERROR/libEGL(52): couldn't load <libhgl.so> library (Cannot load library: load_library[984]: Library 'libhgl.so' not found)
04-05 05:07:20.662: ERROR/libEGL(63): couldn't load <libhgl.so> library (Cannot load library: load_library[984]: Library 'libhgl.so' not found)
04-05 05:07:24.110: ERROR/BatteryService(52): Could not open '/sys/class/power_supply/usb/online'
04-05 05:07:24.122: ERROR/BatteryService(52): Could not open '/sys/class/power_supply/battery/batt_vol'
04-05 05:07:24.122: ERROR/BatteryService(52): Could not open '/sys/class/power_supply/battery/batt_temp'
04-05 05:07:24.650: ERROR/EventHub(52): could not get driver version for /dev/input/mouse0, Not a typewriter
04-05 05:07:24.650: ERROR/EventHub(52): could not get driver version for /dev/input/mice, Not a typewriter
04-05 05:07:24.931: ERROR/System(52): Failure starting core service
04-05 05:07:24.931: ERROR/System(52): java.lang.SecurityException
04-05 05:07:24.931: ERROR/System(52):     at android.os.BinderProxy.transact(Native Method)
04-05 05:07:24.931: ERROR/System(52):     at android.os.ServiceManagerProxy.addService(ServiceManagerNative.java:146)
04-05 05:07:24.931: ERROR/System(52):     at android.os.ServiceManager.addService(ServiceManager.java:72)
04-05 05:07:24.931: ERROR/System(52):     at com.android.server.ServerThread.run(SystemServer.java:162)
04-05 05:07:24.931: ERROR/AndroidRuntime(52): Crash logging skipped, no checkin service
04-05 05:07:26.231: ERROR/LockPatternKeyguardView(52): Failed to bind to GLS while checking for account
04-05 05:07:29.761: ERROR/ActivityThread(96): Failed to find provider info for com.google.settings
04-05 05:07:29.782: ERROR/ActivityThread(96): Failed to find provider info for com.google.settings
04-05 05:07:31.541: ERROR/ApplicationContext(52): Couldn't create directory for SharedPreferences file shared_prefs/wallpaper-hints.xml
04-05 05:07:33.299: ERROR/MediaPlayerService(31): Couldn't open fd for content://settings/system/notification_sound
04-05 05:07:33.319: ERROR/MediaPlayer(52): Unable to to create media player
04-05 05:07:34.529: ERROR/ActivityThread(93): Failed to find provider info for android.server.checkin
04-05 05:07:37.642: ERROR/ActivityThread(93): Failed to find provider info for android.server.checkin
04-05 05:07:37.949: ERROR/ActivityThread(93): Failed to find provider info for android.server.checkin
04-05 05:07:44.659: ERROR/AndroidRuntime(223): Uncaught handler: thread main exiting due to uncaught exception
04-05 05:07:44.669: ERROR/AndroidRuntime(223): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.music_player/com.android.music_player.ActivityNext}: java.lang.NullPointerException
04-05 05:07:44.669: ERROR/AndroidRuntime(223):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2401)
04-05 05:07:44.669: ERROR/AndroidRuntime(223):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2417)
04-05 05:07:44.669: ERROR/AndroidRuntime(223):     at android.app.ActivityThread.access$2100(ActivityThread.java:116)
04-05 05:07:44.669: ERROR/AndroidRuntime(223):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794)
04-05 05:07:44.669: ERROR/AndroidRuntime(223):     at android.os.Handler.dispatchMessage(Handler.java:99)
04-05 05:07:44.669: ERROR/AndroidRuntime(223):     at android.os.Looper.loop(Looper.java:123)
04-05 05:07:44.669: ERROR/AndroidRuntime(223):     at android.app.ActivityThread.main(ActivityThread.java:4203)
04-05 05:07:44.669: ERROR/AndroidRuntime(223):     at java.lang.reflect.Method.invokeNative(Native Method)
04-05 05:07:44.669: ERROR/AndroidRuntime(223):     at java.lang.reflect.Method.invoke(Method.java:521)
04-05 05:07:44.669: ERROR/AndroidRuntime(223):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
04-05 05:07:44.669: ERROR/AndroidRuntime(223):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549)
04-05 05:07:44.669: ERROR/AndroidRuntime(223):     at dalvik.system.NativeStart.main(Native Method)
04-05 05:07:44.669: ERROR/AndroidRuntime(223): Caused by: java.lang.NullPointerException
04-05 05:07:44.669: ERROR/AndroidRuntime(223):     at com.android.music_player.ActivityNext.playMusic(ActivityNext.java:99)
04-05 05:07:44.669: ERROR/AndroidRuntime(223):     at com.android.music_player.ActivityNext.onCreate(ActivityNext.java:39)
04-05 05:07:44.669: ERROR/AndroidRuntime(223):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123)
04-05 05:07:44.669: ERROR/AndroidRuntime(223):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364)
04-05 05:07:44.669: ERROR/AndroidRuntime(223):     ... 11 more
我想用android做个播放器，有两个activity 第一个显示列表，点击后调到另外一个activity，我在第一个activity把歌曲的名字用intent传到第二个activity的！这样不行吗？