快速更改底部导航应用程序崩溃

Question

我有底部导航与片段和改型api调用

我调用loadfragment来切换片段，如下所示

private boolean loadFragment(Fragment fragment) {
        //switching fragment
        if (fragment != null) {
            getSupportFragmentManager()
                    .beginTransaction()
                    .replace(R.id.fragment_container, fragment)
                    .commit();
            return true;
        }
        return false;
    }

 @Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view = inflater.inflate(R.layout.fragment_current, container, false);
    unbinder = ButterKnife.bind(this, view);
    context = getActivity();
    callCategoryAPI();
    return view;
}

洛克卡特

在.java:6606)在java.lang.reflect.method.invoke（method.java）在com.android.internal.os.runtimeinit$methodandargscaller.run（runtimeinit.java:518)在com.android.internal.os.zygoteinit.main(zygoteinit.java:823)

--

致命异常:java.lang.NullPointerException：试图在com.example.fragment.statements.CurrentFragment$1的空对象引用上调用虚拟方法'void Android.widget.textview.settext(java.lang.charsequence)'。在com.example.services.current_statement.CurrentStatementController$2的onapisuccess(CurrentFragment.java:82)在com.example.services.CurrentStatementController$2的onresponse handler.dispatchMessage(handler.java:99)(handler.java:171)(android.app.activitythread.main(activitythread.java:6606)(java.lang.reflect.method.invoke(method.java)，com.android.internal.os.runtimeinit$methodandArgsCaller.run(runtimeinit.java:518)，com.android.internal.os.zygoteinit.main(zygoteinit.java

Answer 1

设置在你的片段中

 if(activity != null && isAdded) {

  // perform your task

}