“无法启动活动” 的错误

Question

我的代码：

private void filldata(){ 
    Cursor datacursor = sqlite.fetchalldata("Program"); 
    startManagingCursor(datacursor); 

    String[] from = new String[]{DatabaseHelper.KEY_PROGRAM_DATE, DatabaseHelper.KEY_PROGRAM_TIME, DatabaseHelper.KEY_PROGRAM_CHANNEL}; 
    String[] from1 = new String[]{DatabaseHelper.KEY_PROGRAM_TITLE}; 

    int[] to = new int[]{R.id.programdate, R.id.programtime, R.id.programchannel}; 
    int[] to1 = new int[]{R.id.programtitle}; 

    SimpleExpandableListAdapter SEL = new SimpleExpandableListAdapter(this, 
        createGroupList(), R.layout.programgroup_row, from1, to1,  
        createChildList(), R.layout.programchild_row, from, to); 
    setListAdapter(SEL); 
} 

当我打电话的oncreate()filldata()，该Logcat给了我这个错误：

04-27 03:43:10.066: WARN/dalvikvm(279): threadid=1: thread exiting with uncaught exception (group=0x4001d800) 
04-27 03:43:10.146: ERROR/AndroidRuntime(279): FATAL EXCEPTION: main 
04-27 03:43:10.146: ERROR/AndroidRuntime(279): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.imammuda/com.android.imammuda.ImamMuda}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.imammuda/com.android.imammuda.Program}: java.lang.NullPointerException 
04-27 03:43:10.146: ERROR/AndroidRuntime(279):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) 
04-27 03:43:10.146: ERROR/AndroidRuntime(279):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 
04-27 03:43:10.146: ERROR/AndroidRuntime(279):  at android.app.ActivityThread.access$2300(ActivityThread.java:125) 
04-27 03:43:10.146: ERROR/AndroidRuntime(279):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 
04-27 03:43:10.146: ERROR/AndroidRuntime(279):  at android.os.Handler.dispatchMessage(Handler.java:99) 
04-27 03:43:10.146: ERROR/AndroidRuntime(279):  at android.os.Looper.loop(Looper.java:123) 
04-27 03:43:10.146: ERROR/AndroidRuntime(279):  at android.app.ActivityThread.main(ActivityThread.java:4627) 
04-27 03:43:10.146: ERROR/AndroidRuntime(279):  at java.lang.reflect.Method.invokeNative(Native Method) 
04-27 03:43:10.146: ERROR/AndroidRuntime(279):  at java.lang.reflect.Method.invoke(Method.java:521) 
04-27 03:43:10.146: ERROR/AndroidRuntime(279):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
04-27 03:43:10.146: ERROR/AndroidRuntime(279):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
04-27 03:43:10.146: ERROR/AndroidRuntime(279):  at dalvik.system.NativeStart.main(Native Method) 
04-27 03:43:10.146: ERROR/AndroidRuntime(279): Caused by: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.imammuda/com.android.imammuda.Program}: java.lang.NullPointerException 
04-27 03:43:10.146: ERROR/AndroidRuntime(279):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) 
04-27 03:43:10.146: ERROR/AndroidRuntime(279):  at android.app.ActivityThread.startActivityNow(ActivityThread.java:2503) 
04-27 03:43:10.146: ERROR/AndroidRuntime(279):  at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:127) 
04-27 03:43:10.146: ERROR/AndroidRuntime(279):  at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:339) 
04-27 03:43:10.146: ERROR/AndroidRuntime(279):  at android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:651) 
04-27 03:43:10.146: ERROR/AndroidRuntime(279):  at android.widget.TabHost.setCurrentTab(TabHost.java:323) 
04-27 03:43:10.146: ERROR/AndroidRuntime(279):  at android.widget.TabHost.addTab(TabHost.java:213) 
04-27 03:43:10.146: ERROR/AndroidRuntime(279):  at com.android.imammuda.ImamMuda.onCreate(ImamMuda.java:26) 
04-27 03:43:10.146: ERROR/AndroidRuntime(279):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
04-27 03:43:10.146: ERROR/AndroidRuntime(279):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 
04-27 03:43:10.146: ERROR/AndroidRuntime(279):  ... 11 more 
04-27 03:43:10.146: ERROR/AndroidRuntime(279): Caused by: java.lang.NullPointerException 
04-27 03:43:10.146: ERROR/AndroidRuntime(279):  at com.android.imammuda.Program.createGroupList(Program.java:91) 
04-27 03:43:10.146: ERROR/AndroidRuntime(279):  at com.android.imammuda.Program.filldata(Program.java:45) 
04-27 03:43:10.146: ERROR/AndroidRuntime(279):  at com.android.imammuda.Program.onCreate(Program.java:29) 
04-27 03:43:10.146: ERROR/AndroidRuntime(279):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
04-27 03:43:10.146: ERROR/AndroidRuntime(279):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 
04-27 03:43:10.146: ERROR/AndroidRuntime(279):  ... 20 more 

*其他类

Databasehelper extends SqliteOpenHelper

sqlite得到了open，close，createdata，fetchdata从/到databasehelper

我想知道为什么我得到这个错误时，我的功能也没有问题，当我不把它。

Answer 1

它击中在Program类行号91.检查NullPointer Exception该行并尝试解决此空指针异常