Androidアプリケーションはエミュレータ（p1000）で動作しません:(

Question

私はAndroidプログラミングには新しく、2つの整数を追加するアプリを書いていますが、実行時にエラーが発生します。 'アプリケーション（com.android.xxxx）には予期せず停止し、以下の投稿としてログがデバッグ、私を支援し、問題を理解してください：。。。

11-08 02:02:17.671: E/AndroidRuntime(328): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
11-08 02:02:17.671: E/AndroidRuntime(328): at dalvik.system.NativeStart.main(Native Method) 
11-08 02:02:17.671: E/AndroidRuntime(328): Caused by: java.lang.NullPointerException 
11-08 02:02:17.671: E/AndroidRuntime(328): at com.android.add.AdditionActivity.onCreate(AdditionActivity.java:17) 
11-08 02:02:17.671: E/AndroidRuntime(328): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
11-08 02:02:17.671: E/AndroidRuntime(328): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 
11-08 02:02:17.671: E/AndroidRuntime(328): ... 11 more 
11-08 02:35:42.461: D/AndroidRuntime(1153): Shutting down VM 
11-08 02:35:42.461: W/dalvikvm(1153): threadid=1: thread exiting with uncaught exception (group=0x4001d800) 
11-08 02:35:42.501: E/AndroidRuntime(1153): FATAL EXCEPTION: main 
11-08 02:35:42.501: E/AndroidRuntime(1153): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.add/com.android.add.AdditionActivity}: java.lang.NullPointerException 
11-08 02:35:42.501: E/AndroidRuntime(1153):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) 
11-08 02:35:42.501: E/AndroidRuntime(1153):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 
11-08 02:35:42.501: E/AndroidRuntime(1153):  at android.app.ActivityThread.access$2300(ActivityThread.java:125) 
11-08 02:35:42.501: E/AndroidRuntime(1153):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 
11-08 02:35:42.501: E/AndroidRuntime(1153):  at android.os.Handler.dispatchMessage(Handler.java:99) 
11-08 02:35:42.501: E/AndroidRuntime(1153):  at android.os.Looper.loop(Looper.java:123) 
11-08 02:35:42.501: E/AndroidRuntime(1153):  at android.app.ActivityThread.main(ActivityThread.java:4627) 
11-08 02:35:42.501: E/AndroidRuntime(1153):  at java.lang.reflect.Method.invokeNative(Native Method) 
11-08 02:35:42.501: E/AndroidRuntime(1153):  at java.lang.reflect.Method.invoke(Method.java:521) 
11-08 02:35:42.501: E/AndroidRuntime(1153):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
11-08 02:35:42.501: E/AndroidRuntime(1153):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
11-08 02:35:42.501: E/AndroidRuntime(1153):  at dalvik.system.NativeStart.main(Native Method) 
11-08 02:35:42.501: E/AndroidRuntime(1153): Caused by: java.lang.NullPointerException 
11-08 02:35:42.501: E/AndroidRuntime(1153):  at com.android.add.AdditionActivity.onCreate(AdditionActivity.java:17) 
11-08 02:35:42.501: E/AndroidRuntime(1153):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
11-08 02:35:42.501: E/AndroidRuntime(1153):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 
11-08 02:35:42.501: E/AndroidRuntime(1153):  ... 11 more 

Answer 1

あなたは起動からあなたの活動を妨げるAdditionActivity.javaのライン17にNullPointerExceptionが、持っている