如何以编程方式更改Android菜单

Question

我有两种不同的菜单布局.我想在单击按钮时更改运行时的膨胀菜单.

最初菜单设置为@menu/navigation.我希望它更改@menu/navigation2为单击按钮时.

activity_main.xml中

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="th.ac.sd.sdschoolas.MainActivity">

    <FrameLayout
        android:id="@+id/content_main"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1">

        <WebView
            android:id="@+id/web_main"
            android:layout_width="match_parent"
            android:layout_height="match_parent"/>

        <ImageView
            android:id="@+id/imageView"
            android:layout_width="152dp"
            android:layout_height="158dp"
            android:layout_x="23dp"
            android:layout_y="46dp"
            app:srcCompat="@mipmap/logo"
            android:padding="20dp"/>
    </FrameLayout>

    <android.support.design.widget.BottomNavigationView
        android:id="@+id/navigation"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        android:background="?android:attr/windowBackground"
        app:menu="@menu/navigation" />

</LinearLayout>

菜单/ navigation.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">

    <item
        android:id="@+id/nav1"
        android:icon="@mipmap/homeicon"
        android:title="@string/title_home" />

    <item
        android:id="@+id/nav2"
        android:icon="@mipmap/newsicon01"
        android:title="@string/title_news" />

    <item
        android:id="@+id/nav3"
        android:icon="@drawable/ic_calendar_page_empty"
        android:title="@string/title_cal" />

    <item
        android:id="@+id/nav4"
        android:icon="@drawable/ic_chat_bubbles"
        android:title="@string/title_sms" />

    <item
        android:id="@+id/nav5"
        android:icon="@mipmap/more"
        android:title="@string/title_more" />

</menu>

菜单/ navigation2.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">

    <item
        android:id="@+id/nav1"
        android:icon="@mipmap/seticon"
        android:title="@string/title_setting" />

    <item
        android:id="@+id/nav2"
        android:icon="@mipmap/moreicom"
        android:title="@string/title_more2" />

</menu>

Answer 1

可以通过覆盖onCreateOptionsMenu方法来扩充菜单.

您可以使用内部状态来选择要膨胀的菜单,例如

private int menuToChoose = R.menu.navigation;

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(menuToChoose, menu);
    return true;
}

然后,在OnClickListener你需要改变状态和调用invalidateOptionsMenu(),例如

public void onClick(View v) {
    menuToChoose = R.menu.navigation2;

    invalidateOptionsMenu();
}