アプリケーションは以前は動作していましたが、今は動作しません。 Log cat

Question

私のアプリケーションは、onDestroy（）機能を実装する前にほんの数分で作業していました。それは動作しませんでしたので、私のアプリはスプラッシュ画面を通過しないことを見つけるためにそれを取り除きました。誰かを助けることができますか？感謝の下にログ猫。

06-23 13:24:55.486: INFO/ActivityManager(164): Start proc com.example.sdr for activity com.example.sdr/.SplashMain: pid=8700 uid=10063 gids={3003} 
06-23 13:24:55.786: DEBUG/dalvikvm(8700): GC_EXTERNAL_ALLOC freed 663 objects/51760 bytes in 100ms 
06-23 13:24:56.236: INFO/ActivityManager(164): Displayed activity com.example.sdr/.SplashMain: 770 ms (total 242823 ms) 
06-23 13:25:01.106: INFO/ActivityManager(164): Starting activity: Intent { act=com.example.sdr.CLEARSCREEN cmp=com.example.sdr/.MainTab } 
06-23 13:25:01.216: DEBUG/AndroidRuntime(8700): Shutting down VM 
06-23 13:25:01.226: WARN/dalvikvm(8700): threadid=1: thread exiting with uncaught exception (group=0x400207e8) 
06-23 13:25:01.286: ERROR/AndroidRuntime(8700): FATAL EXCEPTION: main 
06-23 13:25:01.286: ERROR/AndroidRuntime(8700): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.sdr/com.example.sdr.MainTab}: java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.sdr/com.example.sdr.PlaylistActivity}: java.lang.NullPointerException 
06-23 13:25:01.286: ERROR/AndroidRuntime(8700):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) 
06-23 13:25:01.286: ERROR/AndroidRuntime(8700):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 
06-23 13:25:01.286: ERROR/AndroidRuntime(8700):  at android.app.ActivityThread.access$2300(ActivityThread.java:125) 
06-23 13:25:01.286: ERROR/AndroidRuntime(8700):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 
06-23 13:25:01.286: ERROR/AndroidRuntime(8700):  at android.os.Handler.dispatchMessage(Handler.java:99) 
06-23 13:25:01.286: ERROR/AndroidRuntime(8700):  at android.os.Looper.loop(Looper.java:123) 
06-23 13:25:01.286: ERROR/AndroidRuntime(8700):  at android.app.ActivityThread.main(ActivityThread.java:4627) 
06-23 13:25:01.286: ERROR/AndroidRuntime(8700):  at java.lang.reflect.Method.invokeNative(Native Method) 
06-23 13:25:01.286: ERROR/AndroidRuntime(8700):  at java.lang.reflect.Method.invoke(Method.java:521) 
06-23 13:25:01.286: ERROR/AndroidRuntime(8700):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
06-23 13:25:01.286: ERROR/AndroidRuntime(8700):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
06-23 13:25:01.286: ERROR/AndroidRuntime(8700):  at dalvik.system.NativeStart.main(Native Method) 
06-23 13:25:01.286: ERROR/AndroidRuntime(8700): Caused by: java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.sdr/com.example.sdr.PlaylistActivity}: java.lang.NullPointerException 
06-23 13:25:01.286: ERROR/AndroidRuntime(8700):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2585) 
06-23 13:25:01.286: ERROR/AndroidRuntime(8700):  at android.app.ActivityThread.startActivityNow(ActivityThread.java:2503) 
06-23 13:25:01.286: ERROR/AndroidRuntime(8700):  at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:127) 
06-23 13:25:01.286: ERROR/AndroidRuntime(8700):  at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:339) 
06-23 13:25:01.286: ERROR/AndroidRuntime(8700):  at android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:676) 
06-23 13:25:01.286: ERROR/AndroidRuntime(8700):  at android.widget.TabHost.setCurrentTab(TabHost.java:348) 
06-23 13:25:01.286: ERROR/AndroidRuntime(8700):  at android.widget.TabHost.addTab(TabHost.java:227) 
06-23 13:25:01.286: ERROR/AndroidRuntime(8700):  at com.example.sdr.MainTab.onCreate(MainTab.java:27) 
06-23 13:25:01.286: ERROR/AndroidRuntime(8700):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
06-23 13:25:01.286: ERROR/AndroidRuntime(8700):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 
06-23 13:25:01.286: ERROR/AndroidRuntime(8700):  ... 11 more 
06-23 13:25:01.286: ERROR/AndroidRuntime(8700): Caused by: java.lang.NullPointerException 
06-23 13:25:01.286: ERROR/AndroidRuntime(8700):  at android.app.Activity.findViewById(Activity.java:1637) 
06-23 13:25:01.286: ERROR/AndroidRuntime(8700):  at com.example.sdr.PlaylistActivity.<init>(PlaylistActivity.java:93) 
06-23 13:25:01.286: ERROR/AndroidRuntime(8700):  at java.lang.Class.newInstanceImpl(Native Method) 
06-23 13:25:01.286: ERROR/AndroidRuntime(8700):  at java.lang.Class.newInstance(Class.java:1429) 
06-23 13:25:01.286: ERROR/AndroidRuntime(8700):  at android.app.Instrumentation.newActivity(Instrumentation.java:1021) 
06-23 13:25:01.286: ERROR/AndroidRuntime(8700):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2577) 
06-23 13:25:01.286: ERROR/AndroidRuntime(8700):  ... 20 more 

Answer 1

あなたが適切にonCreateでsetContentView(your_layout_xml)を設定していますか？ AndroidはPlaylistActivity.javaの行93で一部のビューを見つけることができません。