Question

当特定片段处于活动状态时，试图从工具栏的菜单中隐藏某些项目时出现问题。（编辑：在这种情况下，工具栏未设置为ActionBar）

我一直在寻找解决方案，发现可以设置MenuItem的可见性，我试图实现这一点，但是却收到一条错误消息，指出MenuItem实际上是一个ActionMenuItemView。

我不知道这是否与我使用Androidx有关。之后，我尝试用ActionMenuItemView替换MenuItem来查找是否存在可以隐藏视图但找不到任何视图的方法。这是我的代码（在这种情况下，当备份片段处于活动状态时，我想在工具栏上隐藏刷新图标）：

public class HomeActivity extends AppCompatActivity {



private Toolbar toolbar2;


final Fragment fragment1 = new HomeFragment();
final Fragment fragment2 = new ReportFragment();
final Fragment fragment3 = new BackupFragment();
final Fragment fragment4 = new SettingFragment();
final FragmentManager fm = getSupportFragmentManager();
Fragment active = fragment1;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_home);

    //Setting up the Toolbar
    toolbar2 = (Toolbar)findViewById(R.id.toolbar_2);
    toolbar2.inflateMenu(R.menu.test_menu);

    //Setting bottom navaigation view
    BottomNavigationView navigation =  findViewById(R.id.navigation);
       navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);

    fm.beginTransaction().add(R.id.main_container, fragment4, "4").hide(fragment4).commit();
    fm.beginTransaction().add(R.id.main_container, fragment3, "3").hide(fragment3).commit();
    fm.beginTransaction().add(R.id.main_container, fragment2, "2").hide(fragment2).commit();
    fm.beginTransaction().add(R.id.main_container,fragment1, "1").commit();

    }

private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
        = item -> {
            switch (item.getItemId()) {
                case R.id.navigation_home:
                    fm.beginTransaction().hide(active).show(fragment1).commit();
                    active = fragment1;
                    toolbar2.setTitle("Submitted Reports");
                    return true;

                case R.id.navigation_report:
                    fm.beginTransaction().hide(active).show(fragment2).commit();
                    active = fragment2;
                    toolbar2.setTitle("Templates Reports");
                    return true;

                case R.id.navigation_backup:
                    fm.beginTransaction().hide(active).show(fragment3).commit();
                    active = fragment3;
                    toolbar2.setTitle("Upload Reports");
                    MenuItem refresh = (MenuItem)findViewById(R.id.action_refresh);
                    refresh.setVisible(false);
                    return true;

                case R.id.navigation_setting:
                    fm.beginTransaction().hide(active).show(fragment4).commit();
                    active = fragment4;
                    toolbar2.setTitle("Settings");

                    return true;
            }
            return false;
        };

布局：

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout  xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/container"
tools:context="com.shid.form.UI.HomeActivity"
android:fitsSystemWindows="true"
android:background="@color/primary">

<androidx.appcompat.widget.Toolbar

    android:id="@+id/toolbar_2"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/colorPrimary"
    android:elevation="6dp"
    android:minHeight="?attr/actionBarSize"
    app:navigationIcon="@drawable/ic_menu"
    app:popupTheme="@style/Theme.Popup"
    app:theme="@style/Theme.GuidelinesCompat.Toolbar"
    app:title="Submitted Reports" />





<!-- Fragments Container -->
<FrameLayout
    android:id="@+id/fragment_container"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:layout_marginTop="25dp"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintBottom_toTopOf="@+id/navigation"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent">
<include
layout="@layout/content_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintBottom_toTopOf="@+id/navigation"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="parent"

/>
</FrameLayout>
    <!-- app:layout_constraintTop_toBottomOf="@+id/appBarLayout"-->

<!-- Bottom Navigation View -->

<com.google.android.material.bottomnavigation.BottomNavigationView
    android:id="@+id/navigation"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_marginEnd="0dp"
    android:layout_marginStart="0dp"
    android:background="@color/colorPrimary"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:menu="@menu/navigation"
    />

  </androidx.constraintlayout.widget.ConstraintLayout>

Answer 1

我发现问题出在哪里，由于某种原因，覆盖onCreateOptionsMenu对我来说不起作用，所以我找到了另一种方法：

toolbar2.getMenu().findItem(R.id.action_refresh).setVisible(false);

因此，在我的情况下，由于我想在特定片段处于活动状态时隐藏该项目，因此我创建了两个方法，并根据片段进行调用：

 private void hideMenuItems(){
    toolbar2.getMenu().findItem(R.id.action_refresh).setVisible(false);
    toolbar2.getMenu().findItem(R.id.action_search).setVisible(false);
}

private void revealMenuItems(){
    toolbar2.getMenu().findItem(R.id.action_refresh).setVisible(true);
    toolbar2.getMenu().findItem(R.id.action_search).setVisible(true);
}

androidx.appcompat.view.menu.ActionMenuItemView无法转换为android.view.MenuItem

1 个答案: