Question

如何在onOptionsItemSelected方法中调用自定义类。我有片段，有些片段具有不同的操作栏项目。我不想一遍又一遍地写相同的代码item.getItemId()。我写了一个关于操作栏所选项目的类。它不起作用。如何调用自定义类和方法？

public class ActionMenuItemSelected {
    public Fragment actionMenuSelectedItem(MenuItem item) {
        Fragment selected_fragment = null;
        FirebaseAuth mAuth = FirebaseAuth.getInstance();

        switch (item.getItemId()) {

            case R.id.action_menu_Resmece:
                selected_fragment = new MainFragment();
                break;
            case R.id.action_menu_account:
                selected_fragment = new AccountFragment();
                break;
            case R.id.action_level_about_us:
                selected_fragment = new AboutUsFragment();
                break;
            case R.id.action_level_contact_us:
                selected_fragment = new ContactUsFragment();
                break;
            case R.id.action_menu_log_out:
                mAuth.signOut();
                selected_fragment = new RegisterFragment();
                Toast.makeText(getApplicationContext(), "Logged out", Toast.LENGTH_SHORT).show();
                break;
        }

        return selected_fragment;


    }
    //region goToFragment
    public void goToFragment(Fragment selectFragment) {
        AppCompatActivity activity = (AppCompatActivity) getContext();

        activity.getSupportFragmentManager().beginTransaction().replace(R.id.main_frame, selectFragment).addToBackStack(null).commit();

    }
//endregion
}

我添加了一个类名ActionMenuItemSelected，我想在片段的onOptionsItemSelected方法中调用此方法。我做不到您能帮我调用这种方法吗？

Answer 1

在“活动”中，您需要增加菜单布局

Perl

设置菜单布局后，您可以调用自定义类

//Add this method to your activity public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.main, menu); // Inflate your menu return true; }

private final ActionMenuItemSelected amis = new ActionMenuItemSelected();

但是，如果在您的应用程序中只有一个活动具有此菜单设置，则可以将所有public boolean onOptionsItemSelected(MenuItem item) { Fragment frag = amis.actionMenuSelectedItem(item); goToFragment(frag); // assuming that this method is in your class Activity return true; }逻辑放入您的ActionMenuItemSelected.actionMenuSelectedItem方法中。

如果您位于片段中，请不要忘记在onCreate（）方法中调用onOptionsItemSelected(Menu item)

如何在片段的onOptionsItemSelected

1 个答案: