Android Fragments 如何正确调用MainActivity中的Fragment?

cgyqldqp  于 2023-11-19  发布在  Android
关注(0)|答案(1)|浏览(128)

我有一个Fragment,我从MainActivity类调用它:-)。
以下是片段代码:

public class PersonFragment extends Fragment {

private static final String ARG_NAME = "name";
private static final String ARG_FIRSTNAME = "firstname";

ListView lst;

String[] name = {"Dockar","Nilson"};

String[] firstname = {"Jack","Michel"};

public static PersonFragment newInstance(String[] name, String[] firstname) {
    PersonFragment fragment = new PersonFragment();
    Bundle args = new Bundle();
    args.putStringArray(ARG_NAME, name);
    args.putStringArray(ARG_FIRSTNAME, firstname);
    fragment.setArguments(args);
    return fragment;

}

Activity mainActivity;

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view =  inflater.inflate(R.layout.person_fragment, container, false);

    lst = view.findViewById(R.id.listviewperson);
    CustomeListviewAdapterTest customeListview = new CustomeListviewAdapterTest(this.mainActivity,name,firtname);
    lst.setAdapter(customeListview);

    lst.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
            if(position == 0) {
                Intent intent = new Intent(getContext(),Jack.class);
                startActivity(intent);
            }if(position == 1) {
                Intent intent = new Intent(getContext(),Michel.class);
                startActivity(intent);
            } 
        }
    });

    if (getArguments() != null) {
        name = getArguments().getStringArray(ARG_NAME);
        firstname = getArguments().getStringArray(ARG_FIRSTNAME);

    }

    return view;
}

字符串
我不知道如果一切都好,我没有Android Studio IDE上的错误.
现在我想从MainActivity调用它。所以我把它放在菜单上:

@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
    switch (item.getItemId()) {
        case R.id.drawer_person:
            PersonFragment fragment = PersonFragment.newInstance(HAVE ERROR HERE);
            getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, fragment).addToBackStack(null).commit();

            break;


在newInstance()上,我不知道如何从我的Array调用String Data:
String[] name

String[] firstname
有人可以帮助我如何做到这一点吗?
此致,

swvgeqrz

swvgeqrz1#

在创建PersonFragment的示例时,您似乎希望将字符串数组name和firstname传递给PersonFragment。为此,您需要修改newInstance方法以接受这些数组作为参数。以下是如何做到这一点:
PersonFragment类中,修改newInstance方法,如下所示:

public static PersonFragment newInstance(String[] name, String[] firstname) {
    PersonFragment fragment = new PersonFragment();
    Bundle args = new Bundle();
    args.putStringArray(ARG_NAME, name);
    args.putStringArray(ARG_FIRSTNAME, firstname);
    fragment.setArguments(args);
    return fragment;
}

字符串
现在,在你的MainActivity中,你可以像这样用你的字符串数组作为参数来调用这个方法:

PersonFragment fragment = PersonFragment.newInstance(name, firstname);
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, fragment).addToBackStack(null).commit();


这样,在创建PersonFragment的示例时,您将name和firstname数组传递给PersonFragment,并且这些值将在片段中可访问。您的代码应该可以正确地使用此修改。

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