我被卡住了，一双新的眼睛将不胜感激。我的MainActivity拨打fragment，点击button。它正在拉动它，然后我在fragment中添加database呼叫，现在它正在崩溃。在我的logcat中，它说我的onCreate中得到一个空指针异常。这里是代码和logcat。从NPE崩溃的Android片段onCreate

片段代码

public class StatsFragment extends Fragment {

public static MySmokinDatabase mySmokinDatabase;

public static Model model;

View view;

public View onCreateView(LayoutInflater inflater,

ViewGroup container,

Bundle savedInstanceState) {

model = MainActivity.model;

mySmokinDatabase = new MySmokinDatabase(getActivity());

TextView daysText = (TextView) getView().findViewById(R.id.days);

TextView totalText = (TextView) getView().findViewById(R.id.total);

TextView aveText = (TextView) getView().findViewById(R.id.ave);

try {

daysText.setText("" + (model.getDays()));

totalText.setText("" + mySmokinDatabase.getTotal());

if (model.getDays() > 0)

aveText.setText("" + (float) mySmokinDatabase.getTotal()/(float) model.getDays());

}

catch (Exception e) {

Log.v("*** DEBUG ***", "Error");

System.out.print("error" + e);

}

// Create, or inflate the Fragment’s UI, and return it.

// If this Fragment has no UI then return null.

view = inflater.inflate(R.layout.stats_frag, container, false);

return view;

}

}

按钮处理

public void statisticsHandler(View view) {

FragmentManager fm = getFragmentManager();

FragmentTransaction ft = fm.beginTransaction();

Log.v("*** DEBUG ***", "Statistics Handler");

ft.replace(R.id.main_container_Id, new StatsFragment());

ft.commit();

}

logcat的

03-27 15:40:03.767: W/dalvikvm(862): threadid=1: thread exiting with uncaught exception (group=0x40a13300)

03-27 15:40:03.867: E/AndroidRuntime(862): FATAL EXCEPTION: main

03-27 15:40:03.867: E/AndroidRuntime(862): java.lang.NullPointerException

03-27 15:40:03.867: E/AndroidRuntime(862): at com.example.smokin4tomsullivan.StatsFragment.onCreateView(StatsFragment.java:24)

03-27 15:40:03.867: E/AndroidRuntime(862): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:829)

03-27 15:40:03.867: E/AndroidRuntime(862): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1035)

03-27 15:40:03.867: E/AndroidRuntime(862): at android.app.BackStackRecord.run(BackStackRecord.java:635)

03-27 15:40:03.867: E/AndroidRuntime(862): at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1397)

03-27 15:40:03.867: E/AndroidRuntime(862): at android.app.FragmentManagerImpl$1.run(FragmentManager.java:426)

03-27 15:40:03.867: E/AndroidRuntime(862): at android.os.Handler.handleCallback(Handler.java:615)

03-27 15:40:03.867: E/AndroidRuntime(862): at android.os.Handler.dispatchMessage(Handler.java:92)

03-27 15:40:03.867: E/AndroidRuntime(862): at android.os.Looper.loop(Looper.java:137)

03-27 15:40:03.867: E/AndroidRuntime(862): at android.app.ActivityThread.main(ActivityThread.java:4745)

03-27 15:40:03.867: E/AndroidRuntime(862): at java.lang.reflect.Method.invokeNative(Native Method)

03-27 15:40:03.867: E/AndroidRuntime(862): at java.lang.reflect.Method.invoke(Method.java:511)

03-27 15:40:03.867: E/AndroidRuntime(862): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)

03-27 15:40:03.867: E/AndroidRuntime(862): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)

03-27 15:40:03.867: E/AndroidRuntime(862): at dalvik.system.NativeStart.main(Native Method)