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Advanced activity embedding  |  Android Developers

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By import android.os.Bundle, Import Android.view. MenuItem, Import Androidx.preference.preference FragmentCompat
1. Introduction Activity embedding, introduced in Android 12L (API level 32), enables activity-based apps to display multiple activities simultaneously on large screens to create two-pane layouts such as list-detail. The Build a list-detail layout with activity embedding and Material Design codelab covered how to use XML or Jetpack WindowManager API calls to create a list-detail layout.
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4.1 OptionsMenu | MenuInflater

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By Import Androidx.annotation. NonNull, import android.os.Bundle, import android.view.Menu, Import Android.view. MenuItem
| bilibili.com
在该应用中，活动页面视图根节点为垂直的LinearLayout，在布局中依次放置1个TextView，显示个人信息；1个TextView（id为tv_result），显示OptionsMenu（选项菜单）的选中结果。OptionsMenu在应用的动作栏右侧，点击OptionsMenu，弹出菜单项。在本例中，仅演示OptionsMenu的使用方法，功能比较简单，tv_result显示被选中菜单项的结果。OptionsMenu菜单中，“增加”菜单项以图标的形式直接显示在动作栏（或称标题栏、工具栏）中，“修改”和“删除”菜单项则隐藏在菜单中，通过点击OptionsMenu图标，弹出所隐藏的菜单项。 my_main.xml: <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"...
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Menu-阿里云开发者社区

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By import android.graphics.Color, import android.os.Bundle, import android.view.Menu, Import Android.view. MenuItem
| dasizhe.cn
菜单的基本使用 官方API menu-resource 在Android中，菜单被分为如下三种，选项菜单（OptionsMenu）、上下文菜单（ContextMenu）和子菜单（SubMenu） 重写两个方法 public boolean onCreateOptionsMenu(Menu menu)：调用OptionMenu，在这里完成菜单初始化,只会在第一次初始化菜单时调用 public boolean onOptionsItemSelected(MenuItem item)：菜单项被选中时触发，这里完成事件处理 当然除了上面这两个方法我们可以重写外我们还可以重写这三个方法： public void onOptionsMenuClosed(Menu menu)：菜单关闭会调用该方法 public boolean onPrepareOptionsMenu(Menu menu)：选项菜单显示前会调用该方法， 可在这里进行菜单的调整(动态加载菜单列表) public boolean onMenuOpened(int featureId, Menu...
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