求助——eclipse安卓醒目运行直接终止，请问是什么问题
07-01 23:11:57.312: E/SQLiteLog(4341): (1) near “nullcontent”: syntax error 07-01 23:11:57.332: E/AndroidRuntime(4341): FATAL EXCEPTION: main 07-01 23:11:57.332: E/AndroidRuntime(4341): Process: com.example.notebook, PID: 4341 07-01 23:11:57.332: E/AndroidRuntime(4341): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.notebook/com.example.notebook.Mainjiemian}: android.database.sqlite.SQLiteException: near “nullcontent”: syntax error (code 1): , while compiling: create table notes (_id integer primary key autoincrement,titletext not nullcontent text not null,time text not null) 07-01 23:11:57.332: E/AndroidRuntime(4341): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2219) 07-01 23:11:57.332: E/AndroidRuntime(4341): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2269) 07-01 23:11:57.332: E/AndroidRuntime(4341): at android.app.ActivityThread.access 800 ( A c t i v i t y T h r e a d . j a v a : 135 ) 07 − 0123 : 11 : 57.332 : E / A n d r o i d R u n t i m e ( 4341 ) : a t a n d r o i d . a p p . A c t i v i t y T h r e a d 800(ActivityThread.java:135) 07-01 23:11:57.332: E/AndroidRuntime(4341): at android.app.ActivityThread 800(ActivityThread.java:135)07−0123:11:57.332:E/AndroidRuntime(4341):atandroid.app.ActivityThreadH.handleMessage(ActivityThread.java:1196) 07-01 23:11:57.332: E/AndroidRuntime(4341): at android.os.Handler.dispatchMessage(Handler.java:102) 07-01 23:11:57.332: E/AndroidRuntime(4341): at android.os.Looper.loop(Looper.java:136) 07-01 23:11:57.332: E/AndroidRuntime(4341): at android.app.ActivityThread.main(ActivityThread.java:5045) 07-01 23:11:57.332: E/AndroidRuntime(4341): at java.lang.reflect.Method.invokeNative(Native Method) 07-01 23:11:57.332: E/AndroidRuntime(4341): at java.lang.reflect.Method.invoke(Method.java:515) 07-01 23:11:57.332: E/AndroidRuntime(4341): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 07-01 23:11:57.332: E/AndroidRuntime(4341): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 07-01 23:11:57.332: E/AndroidRuntime(4341): at dalvik.system.NativeStart.main(Native Method) 07-01 23:11:57.332: E/AndroidRuntime(4341): Caused by: android.database.sqlite.SQLiteException: near “nullcontent”: syntax error (code 1): , while compiling: create table notes (_id integer primary key autoincrement,titletext not nullcontent text not null,time text not null) 07-01 23:11:57.332: E/AndroidRuntime(4341): at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method) 07-01 23:11:57.332: E/AndroidRuntime(4341): at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889) 07-01 23:11:57.332: E/AndroidRuntime(4341): at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500) 07-01 23:11:57.332: E/AndroidRuntime(4341): at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588) 07-01 23:11:57.332: E/AndroidRuntime(4341): at android.database.sqlite.SQLiteProgram.(SQLiteProgram.java:58) 07-01 23:11:57.332: E/AndroidRuntime(4341): at android.database.sqlite.SQLiteStatement.(SQLiteStatement.java:31) 07-01 23:11:57.332: E/AndroidRuntime(4341): at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1672) 07-01 23:11:57.332: E/AndroidRuntime(4341): at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1603) 07-01 23:11:57.332: E/AndroidRuntime(4341): at com.example.notebook.MySQL.onCreate(MySQL.java:23) 07-01 23:11:57.332: E/AndroidRuntime(4341): at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:252) 07-01 23:11:57.332: E/AndroidRuntime(4341): at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:188) 07-01 23:11:57.332: E/AndroidRuntime(4341): at com.example.notebook.SQLcaozuo.queryAll(SQLcaozuo.java:56) 07-01 23:11:57.332: E/AndroidRuntime(4341): at com.example.notebook.Mainjiemian.onCreate(Mainjiemian.java:57) 07-01 23:11:57.332: E/AndroidRuntime(4341): at android.app.Activity.performCreate(Activity.java:5231) 07-01 23:11:57.332: E/AndroidRuntime(4341): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1104) 07-01 23:11:57.332: E/AndroidRuntime(4341): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2163) 07-01 23:11:57.332: E/AndroidRuntime(4341): … 11 more 07-01 23:12:06.344: E/libEGL(6112): load_driver driver_absolute_path:/system/lib/egl/libEGL_emulation.so 07-01 23:12:06.384: E/libEGL(6112): load_driver driver_absolute_path:/system/lib/egl/libGLESv1_CM_emulation.so 07-01 23:12:06.388: E/libEGL(6112): load_driver driver_absolute_path:/system/lib/egl/libGLESv2_emulation.so
