Android 自定义下拉/弹出菜单 [英] Android custom dropdown/popup menu

问题描述

如何创建一个固定到按钮的自定义下拉/弹出菜单?

How do I do a custom dropdown/popup menu anchored to a button?

我需要它像弹出菜单(锚定到视图)一样工作，并在我单击菜单中的项目时执行某些操作.

I need it to work like the popup menu (anchored to a view), and do something when I click an item from the menu.

如何通过代码向菜单添加项目，保持菜单的高度并使其在超过 5 个项目时可滚动.我不需要添加任何图片，只需添加文字.

How do I add items to the menu by code, keeping menu's height and make it scrollable if there are more than 5 items. I don't need to add any images, just text.

推荐答案

更新:要使用 Kotlin 在 android 中创建弹出菜单，请参考我的回答 此处.

Update: To create a popup menu in android with Kotlin refer my answer here.

使用 Java 在 android 中创建弹出菜单:

To create a popup menu in android with Java:

在res/layout目录下创建一个布局文件activity_main.xml，里面只有一个按钮.

Create a layout file activity_main.xml under res/layout directory which contains only one button.

文件名:activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    xmlns:tools="http://schemas.android.com/tools"  
    android:layout_width="match_parent"  
    android:layout_height="match_parent"  
    android:paddingBottom="@dimen/activity_vertical_margin"  
    android:paddingLeft="@dimen/activity_horizontal_margin"  
    android:paddingRight="@dimen/activity_horizontal_margin"  
    android:paddingTop="@dimen/activity_vertical_margin"  
    tools:context=".MainActivity" >  

    <Button  
        android:id="@+id/button1"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_alignParentLeft="true"  
        android:layout_alignParentTop="true"  
        android:layout_marginLeft="62dp"  
        android:layout_marginTop="50dp"  
        android:text="Show Popup" />  

</RelativeLayout>  

在res/menu目录下创建文件popup_menu.xml

它包含三个项目，如下所示.

It contains three items as shown below.

文件名:poupup_menu.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android" >  

    <item  
        android:id="@+id/one"  
        android:title="One"/>  

    <item  
        android:id="@+id/two"  
        android:title="Two"/>  

    <item  
        android:id="@+id/three"  
        android:title="Three"/>  

</menu>  

MainActivity 类，在单击按钮时显示弹出菜单.

MainActivity class which displays the popup menu on button click.

文件名:MainActivity.java

public class MainActivity extends Activity {  
    private Button button1;  

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

        button1 = (Button) findViewById(R.id.button1);
        button1.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                //Creating the instance of PopupMenu
                PopupMenu popup = new PopupMenu(MainActivity.this, button1);
                //Inflating the Popup using xml file
                popup.getMenuInflater()
                    .inflate(R.menu.popup_menu, popup.getMenu());

                //registering popup with OnMenuItemClickListener
                popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
                    public boolean onMenuItemClick(MenuItem item) {
                        Toast.makeText(
                            MainActivity.this,
                            "You Clicked : " + item.getTitle(),
                            Toast.LENGTH_SHORT
                        ).show();
                        return true;
                    }
                });

                popup.show(); //showing popup menu
            }
        }); //closing the setOnClickListener method
    }
}

以编程方式添加:

PopupMenu menu = new PopupMenu(this, view);

menu.getMenu().add("One");
menu.getMenu().add("Two");
menu.getMenu().add("Three");

menu.show();

按照此链接以编程方式创建菜单.

Follow this link for creating menu programmatically.

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