安卓播放器：把主题存好，运行的时候继续是上次存的主题，但出现错误了

跪求大神们帮忙啊，马上给分！！！
05-27 07:13:52.352: W/dalvikvm(795): threadid=1: thread exiting with uncaught exception (group=0x40015560)
05-27 07:13:52.363: E/AndroidRuntime(795): FATAL EXCEPTION: main
05-27 07:13:52.363: E/AndroidRuntime(795): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.jiang.android/com.jiang.android.MusicPlayer3}: java.lang.NullPointerException
05-27 07:13:52.363: E/AndroidRuntime(795):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
05-27 07:13:52.363: E/AndroidRuntime(795):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
05-27 07:13:52.363: E/AndroidRuntime(795):  at android.app.ActivityThread.access$1500(ActivityThread.java:117)
05-27 07:13:52.363: E/AndroidRuntime(795):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
05-27 07:13:52.363: E/AndroidRuntime(795):  at android.os.Handler.dispatchMessage(Handler.java:99)
05-27 07:13:52.363: E/AndroidRuntime(795):  at android.os.Looper.loop(Looper.java:123)
05-27 07:13:52.363: E/AndroidRuntime(795):  at android.app.ActivityThread.main(ActivityThread.java:3683)
05-27 07:13:52.363: E/AndroidRuntime(795):  at java.lang.reflect.Method.invokeNative(Native Method)
05-27 07:13:52.363: E/AndroidRuntime(795):  at java.lang.reflect.Method.invoke(Method.java:507)
05-27 07:13:52.363: E/AndroidRuntime(795):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
05-27 07:13:52.363: E/AndroidRuntime(795):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
05-27 07:13:52.363: E/AndroidRuntime(795):  at dalvik.system.NativeStart.main(Native Method)
05-27 07:13:52.363: E/AndroidRuntime(795): Caused by: java.lang.NullPointerException
05-27 07:13:52.363: E/AndroidRuntime(795):  at com.jiang.android.MusicPlayer3.setTheme(MusicPlayer3.java:294)
05-27 07:13:52.363: E/AndroidRuntime(795):  at com.jiang.android.MusicPlayer3.onCreate(MusicPlayer3.java:70)
05-27 07:13:52.363: E/AndroidRuntime(795):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
05-27 07:13:52.363: E/AndroidRuntime(795):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
05-27 07:13:52.363: E/AndroidRuntime(795):  ... 11 more

解决方案 »

  1.   

    MusicPlayer3.java文件代码贴上来看看
      

  2.   

    MusicPlayer3.java 294行的setTheme空指针了，看一下这个值是不是没取到。
      

  3.   

    05-27 07:13:52.363: E/AndroidRuntime(795): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.jiang.android/com.jiang.android.MusicPlayer3}: java.lang.NullPointerException空指针导致异常，检查一下。
      

  4.   

    还有
    05-27 07:13:52.363: E/AndroidRuntime(795): Caused by: java.lang.NullPointerException
    对有些关键部分的JAVA对象进行非空判断一下。