阅读《Android 从入门到精通》（26）——上下文菜单

Posted 2022-12-06 SweetLoverFT

上下文菜单（ContextMenu）

上下文菜单不同于 Windows 菜单，需要长按才能出现子菜单。

ContextMenu 类方法

ContextMenu 示例

完整工程：http://download.csdn.net/detail/sweetloveft/9435611

1.MainActivity.java

package com.sweetlover.activity;

import com.sweetlover.contextmenu.R;

import android.app.Activity;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.SubMenu;
import android.view.View;
import android.widget.TextView;

public class MainActivity extends Activity 

	private TextView tv1 = null;
	private TextView tv2 = null;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) 
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		tv1 = (TextView)findViewById(R.id.textView1);
		tv2 = (TextView)findViewById(R.id.textView2);
		
		// 将控件注册到上下文之中
		registerForContextMenu(tv1);
		registerForContextMenu(tv2);
	

	@Override
	public void onCreateContextMenu(ContextMenu menu, View v,
			ContextMenuInfo menuInfo) 
		// TODO Auto-generated method stub
		super.onCreateContextMenu(menu, v, menuInfo);
		
		if (v == tv1) 
			menu.setHeaderIcon(R.drawable.miku);
			menu.setHeaderTitle("我的菜单");
			menu.add(1, 0, 0, "菜单1");
			menu.add(1, 1, 1, "菜单2");
			for (int i = 3; i < 8; i++)
				menu.add(1, 1, 2, "菜单" + i);
		 else if (v == tv2) 
			
			SubMenu[] subMenu = new SubMenu[6];
			
			subMenu[0] = menu.addSubMenu("二级菜单1");
			subMenu[0].setHeaderIcon(R.drawable.miku);
			subMenu[0].add(0, 0, 0, "二级菜单1/菜单1");
			subMenu[0].add(0, 1, 1, "二级彩单1/菜单2");
			subMenu[0].setGroupCheckable(1, true, true);	// 设置整个组可选
			
			subMenu[1] = menu.addSubMenu("二级菜单2");
			subMenu[1].setHeaderIcon(R.drawable.miku);
			subMenu[1].add(1, 0, 0, "二级菜单2/菜单1");
			subMenu[1].add(1, 1, 1, "二级彩单2/菜单2");
			subMenu[1].setGroupCheckable(1, true, true);	// 设置整个组可选
			
			subMenu[2] = menu.addSubMenu("二级菜单3");
			subMenu[2].setHeaderIcon(R.drawable.miku);
			subMenu[2].add(1, 0, 0, "二级菜单3/菜单1");
			subMenu[2].add(1, 1, 1, "二级彩单3/菜单2");
			subMenu[2].setGroupCheckable(1, true, true);	// 设置整个组可选
			
			subMenu[3] = menu.addSubMenu("二级菜单4");
			subMenu[3].setHeaderIcon(R.drawable.miku);
			subMenu[3].add(1, 0, 0, "二级菜单4/菜单1");
			subMenu[3].add(1, 1, 1, "二级彩单4/菜单2");
			subMenu[3].setGroupCheckable(1, true, true);	// 设置整个组可选
			
			subMenu[4] = menu.addSubMenu("二级菜单5");
			subMenu[4].setHeaderIcon(R.drawable.miku);
			subMenu[4].add(1, 0, 0, "二级菜单5/菜单1");
			subMenu[4].add(1, 1, 1, "二级彩单5/菜单2");
			subMenu[4].setGroupCheckable(1, true, true);	// 设置整个组可选
			
			subMenu[5] = menu.addSubMenu("二级菜单6");
			subMenu[5].setHeaderIcon(R.drawable.miku);
			subMenu[5].add(1, 0, 0, "二级菜单6/菜单1");
			subMenu[5].add(1, 1, 1, "二级彩单6/菜单2");
			subMenu[5].setGroupCheckable(1, true, true);	// 设置整个组可选
		
	

2.activity_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"
    android:orientation="vertical" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/note"
        android:textAppearance="?android:attr/textAppearanceMedium" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/item1"
        android:textAppearance="?android:attr/textAppearanceMedium" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/item2"
        android:textAppearance="?android:attr/textAppearanceMedium" />

</LinearLayout>

3.string.xml

<resources>

    <string name="app_name">ContextMenu</string>
    <string name="note">长时间按住显示菜单</string>
    <string name="item1">主菜单1</string>
    <string name="item2">主菜单2</string>

</resources>