尝试在 FRAGMENT 中使用 Butterknife 时出现 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");
}
如果我使用样板代码来声明 tv_detail_startTime
,它会起作用。仅使用 Bind
会给出错误。
完整的堆栈跟踪:
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)
最佳答案
绑定(bind) fragment 而不是 Activity
View v = inflater.inflate(R.layout.xxx, container, false);
ButterKnife.bind(this, v);
关于在 fragment 中使用 Butterknife 时出现 java.lang.NullPointerException,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/33409211/