如何在使用菜单项选择的选项上附加片段

Question

你好，我有一个有菜单项的菜单布局。菜单项有一个带有操作视图类的项，它应该在单击时附加一个片段。如何在使用菜单项的动作视图类使用单击AccountManagementFragment菜单项时附加action_account

我的菜单项布局

<item android:id="@+id/action_account"
        android:title="Account"
        android:icon="@drawable/ic_profile"
        app:showAsAction="collapseActionView|ifRoom"
        app:actionViewClass="ke.co.clinton.hama.viewslogic.account.AccountManagementFragment"/>

我的onCreateOptionsMenu和onOptionsItemsSelected方法

@Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {

        if (item.getItemId() == R.id.search) {

        }

        return super.onOptionsItemSelected(item);

    }

我的碎片类

import android.os.Bundle;

import androidx.annotation.Nullable;
import androidx.appcompat.widget.Toolbar;
import androidx.fragment.app.Fragment;
import androidx.lifecycle.ViewModelProviders;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import ke.co.clinton.hama.MainActivity;
import ke.co.clinton.hama.R;
import ke.co.clinton.hama.interfaces.DrawerLocker;

public class AccountManagementFragment extends Fragment {

    private AccountManagementViewModel mViewModel;


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        ((MainActivity)getActivity()).getSupportActionBar().hide();
        ((DrawerLocker) getActivity()).setDrawerEnabled(false);
        View view = inflater.inflate(R.layout.fragment_account_management, container, false);
        Toolbar toolbar = view.findViewById(R.id.toolbar);
        toolbar.setTitle("Title");
        toolbar.setNavigationIcon(R.drawable.ic_back_button);
        toolbar.setNavigationOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                getActivity().onBackPressed();
            }
        });
        return view;
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        mViewModel = ViewModelProviders.of(this).get(AccountManagementViewModel.class);
        // TODO: Use the ViewModel

    }


    @Override
    public void onResume() {
        super.onResume();
        ((MainActivity)getActivity()).getSupportActionBar().hide();
        ((DrawerLocker) getActivity()).setDrawerEnabled(true);
    }
    @Override
    public void onStop() {
        super.onStop();
        ((MainActivity)getActivity()).getSupportActionBar().show();
        ((DrawerLocker) getActivity()).setDrawerEnabled(true);
    }

}

Answer 1

不能在菜单项中将Fragment作为app:actionViewClass传递。当菜单项在onOptionItemSelected中被选中时，您真正能做的就是附加片段。

1. 从菜单项中删除app:actionViewClass

• 在AccountManagementFragment中添加一个静态方法以获取实例

公共类AccountManagementFragment扩展片段{.静态AccountManagementFragment newInstance() {返回AccountManagementFragment()；}.}

• 更改onOptionsItemSelected的实现以添加片段

@重写公共布尔值onOptionsItemSelected(@NonNull item) { if (item.getItemId() == R.id.action_account) { //确保在布局中添加片段容器视图(最好是FrameLayout) //这里我假设id是‘容器’== .replace(R.id.container )，AccountManagementFragment.newInstance() .commit() }返回super.onOptionsItemSelected(item)；}