Force Close onCreate() - Android Q&A, Help & Troubleshooting

Please pardon me if this is the wrong section and feel free to report this thread with a request to move to the proper section.
I've been working on an app for XDA Developer TV. The source is located here: https://code.google.com/p/xda-adk/s...cts/xdaadk/app/src/com/google/android/DemoKit
I've been developing on a Nexus 7. I decided to switch to my Galaxy Nexus and the application Force Closes on This Line. Apparently my Bundle savedInstanceState == null.
This is the error:
Code:
09-09 21:59:58.959: D/AndroidRuntime(18735): Shutting down VM
09-09 21:59:58.959: W/dalvikvm(18735): threadid=1: thread exiting with uncaught exception (group=0x40a73300)
09-09 21:59:58.959: E/AndroidRuntime(18735): FATAL EXCEPTION: main
09-09 21:59:58.959: E/AndroidRuntime(18735): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.google.android.DemoKit/com.google.android.DemoKit.DemoKitPhone}: java.lang.NullPointerException
09-09 21:59:58.959: E/AndroidRuntime(18735): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
09-09 21:59:58.959: E/AndroidRuntime(18735): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
09-09 21:59:58.959: E/AndroidRuntime(18735): at android.app.ActivityThread.access$600(ActivityThread.java:130)
09-09 21:59:58.959: E/AndroidRuntime(18735): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
09-09 21:59:58.959: E/AndroidRuntime(18735): at android.os.Handler.dispatchMessage(Handler.java:99)
09-09 21:59:58.959: E/AndroidRuntime(18735): at android.os.Looper.loop(Looper.java:137)
09-09 21:59:58.959: E/AndroidRuntime(18735): at android.app.ActivityThread.main(ActivityThread.java:4745)
09-09 21:59:58.959: E/AndroidRuntime(18735): at java.lang.reflect.Method.invokeNative(Native Method)
09-09 21:59:58.959: E/AndroidRuntime(18735): at java.lang.reflect.Method.invoke(Method.java:511)
09-09 21:59:58.959: E/AndroidRuntime(18735): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
09-09 21:59:58.959: E/AndroidRuntime(18735): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
09-09 21:59:58.959: E/AndroidRuntime(18735): at dalvik.system.NativeStart.main(Native Method)
09-09 21:59:58.959: E/AndroidRuntime(18735): Caused by: java.lang.NullPointerException
09-09 21:59:58.959: E/AndroidRuntime(18735): at com.google.android.DemoKit.DemoKitPhone.showTabContents(DemoKitPhone.java:47)
09-09 21:59:58.959: E/AndroidRuntime(18735): at com.google.android.DemoKit.DemoKitPhone.showControls(DemoKitPhone.java:42)
09-09 21:59:58.959: E/AndroidRuntime(18735): at com.google.android.DemoKit.BaseActivity.onCreate(BaseActivity.java:26)
09-09 21:59:58.959: E/AndroidRuntime(18735): at com.google.android.DemoKit.DemoKitPhone.onCreate(DemoKitPhone.java:32)
09-09 21:59:58.959: E/AndroidRuntime(18735): at android.app.Activity.performCreate(Activity.java:5008)
09-09 21:59:58.959: E/AndroidRuntime(18735): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
09-09 21:59:58.959: E/AndroidRuntime(18735): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
09-09 21:59:58.959: E/AndroidRuntime(18735): ... 11 more
I don't really know how to troubleshoot it because it's a pretty low level problem. How can I fix this?

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Disregard Everything i said before just had a look at the code. and reread your log, it is null pointing at like 47 of the DemoKitPhone
Code:
45 - void showTabContents(Boolean showInput) {
46 - if (showInput) {
47 - mInputContainer.setVisibility(View.VISIBLE);
48 - mOutputContainer.setVisibility(View.GONE);
49 - mOutputLabel.setBackgroundDrawable(mNormalTabImage);
i recon the mInputContainer, mOutputContainer are null.
Let me know how ya go.
Pvy
AdamOutler said:
Please pardon me if this is the wrong section and feel free to report this thread with a request to move to the proper section.
I've been working on an app for XDA Developer TV. The source is located here: https://code.google.com/p/xda-adk/s...cts/xdaadk/app/src/com/google/android/DemoKit
Click to expand...
Click to collapse
may be a little crazy but i remember reading that the
Code:
super.onCreate(savedInstanceState);
Must be first in your overridden onCreate()
i'll DL the code tonight and take another look later if no-one else comes back before hand
Pvy.

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@pvyParts, It already has super.Oncreate and the log warns about a null de-reference on another line, i don't think that's the problem.
This might be helpful.
Super class method does not seem to initialize mInputContainer and it's done by view finder in their demokit2 package. Since your code does not explicitly set it to an object, it causes a null dereference when you call a method from a null pointing class. You can confirm this by trying:
Code:
 void showTabContents(Boolean showInput) {
  if (showInput) {
   mOutputContainer.setVisibility(View.GONE);
   mInputContainer.setVisibility(View.VISIBLE);
   mOutputLabel.setBackgroundDrawable(mNormalTabImage);
  } else {
   mInputContainer.setVisibility(View.GONE);
   mInputLabel.setBackgroundDrawable(mNormalTabImage);
   mOutputContainer.setVisibility(View.VISIBLE);
   mOutputLabel.setBackgroundDrawable(mFocusedTabImage);
  }
 }
If this causes null reference exception at mOutputContainer.setVisibility then you need to set mOutputContainer and mInputContainer to a valid LinearLayout object/resource before calling their class methods.

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Rick_1995 said:
@pvyParts, It already has super.Oncreate and the log warns about a null de-reference on another line, i don't think that's the problem.
[/CODE]
If this causes null reference exception at mOutputContainer.setVisibility then you need to set mOutputContainer and mInputContainer to a valid LinearLayout object/resource before calling their class methods.
Click to expand...
Click to collapse
Yeah once i re-read the code at home i saw what was wrong made me feel rather noobish for getting it so dam wrong
Pvy