在片段中使用Butterknife时的java.lang.NullPointerException
在片段中尝试使用Butterknife时,我遇到了在片段中使用Butterknife时的java.lang.NullPointerException,java,android,android-fragments,textview,butterknife,Java,Android,Android Fragments,Textview,Butterknife,在片段中尝试使用Butterknife时,我遇到了java.lang.NullPointerException。我错过了什么 @Bind(R.id.tv_detail_startTime) TextView tv_detail_startTime; @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullabl
java.lang.NullPointerException
。我错过了什么
@Bind(R.id.tv_detail_startTime) TextView tv_detail_startTime;
@Override
public View onCreateView(LayoutInflater inflater,
@Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
v = inflater.inflate(R.layout.fragment_detail_expanlv,
container, false);
ButterKnife.bind(getActivity());
//THIS IS THE LINE WHERE
tv_detail_startTime.setText("Trying Butterknife out in Android");
}
如果我使用锅炉板代码来声明tv\u detail\u startTime
,它可以工作。仅使用Bind
就会产生错误
完整堆栈跟踪:
10-29 04:30:28.971 24953-24953/com.mavdev.focusoutfacebook E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.mavdev.focusoutfacebook, PID: 24953
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference
at com.mavdev.focusoutfacebook.fragments.scheduledblocks.Fragment_detail_expanlv.onCreateView(Fragment_detail_expanlv.java:424)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:1789)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:955)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1138)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:740)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1501)
at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:458)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
绑定片段而不是活动
View v = inflater.inflate(R.layout.xxx, container, false);
ButterKnife.bind(this, v);
ButterKnife可能假设您正在将活动视图绑定到一个活动,而不是一个片段。
请尝试使用
ButterKnife.bind(this,getActivity())
(请注意额外的内容)。您可以从LogCat发布实际的堆栈跟踪吗?可能是重复的,那么您可以找到哪一行代码com.mavdev.focusoutfacebook.fragments.scheduledblocks.Fragment_detail_expanlv.onCreateView(Fragment_detail_expanlv.java:424)
@BuhakeSindi正如我在问题中所说,这是第424行:tv_detail_startTime.setText(“在Android中尝试巴特knife”)代码>开始了:tv\u detail\u startTime
为null
。你能调试一下看看原因吗?我假设你想绑定父活动中的视图,而不是刚刚创建的片段。Laurent Russier的回答假设视图位于片段中。根据您的用例使用其中一种。不要忘了使用ButterKnife。解除绑定(此);OnDestroytanks,这很有效。我将完成onDestroy的部分,谢谢。