방금 ActionBarSherlock에서 ActionBarCompat로 전환했으며이 작은 오류가 발생할 때까지 모든 것이 잘 작동하고있었습니다. 나는 ActionBarActivity
을 확장하고 그와 관련된 3 개의 단편을 가지고있는 기초 활동을 가지고있다. 내 화면 방향을 변경하려고 할 때까지Fragment (ActionBarCompat) 내부에서 getSupportActionBar()를 호출 할 때 NullPointerException이 발생했습니다.
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
final ActionBar actionBar = ((ActionBarActivity)activity).getSupportActionBar();
actionBar.setHomeButtonEnabled(true);
actionBar.setDisplayHomeAsUpEnabled(true);
actionBar.setDisplayShowTitleEnabled(false);
actionBar.setTitle("");
}
그것은 잘 작동 : 조각 onAttach
방법 중 하나에서,이 코드를 실행하려고합니다. 그런 다음이 코드 줄에 NullPointerException
이 표시됩니다 (actionBar.setHomeButtonEnabled(true);
).
어떻게 해결할 수 있습니까?
편집 :
06-10 18:53:31.440: E/AndroidRuntime(18586): FATAL EXCEPTION: main
06-10 18:53:31.440: E/AndroidRuntime(18586): Process: com.packagename.appname, PID: 18586
06-10 18:53:31.440: E/AndroidRuntime(18586): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.packagename.appname/com.packagename.appname.activities.NewActivity}: java.lang.NullPointerException
06-10 18:53:31.440: E/AndroidRuntime(18586): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2328)
06-10 18:53:31.440: E/AndroidRuntime(18586): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2386)
06-10 18:53:31.440: E/AndroidRuntime(18586): at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3947)
06-10 18:53:31.440: E/AndroidRuntime(18586): at android.app.ActivityThread.access$1000(ActivityThread.java:169)
06-10 18:53:31.440: E/AndroidRuntime(18586): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1283)
06-10 18:53:31.440: E/AndroidRuntime(18586): at android.os.Handler.dispatchMessage(Handler.java:102)
06-10 18:53:31.440: E/AndroidRuntime(18586): at android.os.Looper.loop(Looper.java:136)
06-10 18:53:31.440: E/AndroidRuntime(18586): at android.app.ActivityThread.main(ActivityThread.java:5476)
06-10 18:53:31.440: E/AndroidRuntime(18586): at java.lang.reflect.Method.invokeNative(Native Method)
06-10 18:53:31.440: E/AndroidRuntime(18586): at java.lang.reflect.Method.invoke(Method.java:515)
06-10 18:53:31.440: E/AndroidRuntime(18586): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1268)
06-10 18:53:31.440: E/AndroidRuntime(18586): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1084)
06-10 18:53:31.440: E/AndroidRuntime(18586): at dalvik.system.NativeStart.main(Native Method)
06-10 18:53:31.440: E/AndroidRuntime(18586): Caused by: java.lang.NullPointerException
06-10 18:53:31.440: E/AndroidRuntime(18586): at com.packagename.appname.fragments.NewFragment.onAttach(NewFragment.java:144)
06-10 18:53:31.440: E/AndroidRuntime(18586): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:883)
06-10 18:53:31.440: E/AndroidRuntime(18586): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
06-10 18:53:31.440: E/AndroidRuntime(18586): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1086)
06-10 18:53:31.440: E/AndroidRuntime(18586): at android.support.v4.app.FragmentManagerImpl.dispatchCreate(FragmentManager.java:1879)
06-10 18:53:31.440: E/AndroidRuntime(18586): at android.support.v4.app.FragmentActivity.onCreate(FragmentActivity.java:215)
06-10 18:53:31.440: E/AndroidRuntime(18586): at android.support.v7.app.ActionBarActivity.onCreate(ActionBarActivity.java:97)
06-10 18:53:31.440: E/AndroidRuntime(18586): at com.packagename.appname.activities.NewActivity.onCreate(NewActivity.java:73)
06-10 18:53:31.440: E/AndroidRuntime(18586): at android.app.Activity.performCreate(Activity.java:5451)
06-10 18:53:31.440: E/AndroidRuntime(18586): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093)
06-10 18:53:31.440: E/AndroidRuntime(18586): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2292)
06-10 18:53:31.440: E/AndroidRuntime(18586): ... 12 more
FYI : actionBar.setHomeButtonEnabled
: 144이다 NewFragment
선 여기
전체 에러 로그이다.
게시물 오류가 그것의 단지 부분은 –
@Rod_Algonquin 단지 ([이 게시물은 말했다] 게 아니에요 그 그것을 – lschlessinger