实现上下文菜单

ContextMenu对应的是View，每个View都可以设置上下菜单；一般情况下ContextMenu常用于ListView或者Grid

1、首先给View注册上下文菜单registerForContextMenu()
2、添加上下文菜单内容onCreateContextMenu（）
-可以通过代码动态添加；
-可以加载xml文件中的菜单项
3、设置菜单点击后响应时间onContextItemSelected()

package com.suo.drawable_conextmenu;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ContextMenu.ContextMenuInfo;
import android.widget.ArrayAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends Activity {
    ListView listview = null;

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

    public void showListView() {
        listview = (ListView) findViewById(R.id.listview);
        ArrayAdapter contextAdapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1,
                getdata());
        listview.setAdapter(contextAdapter);
        // 注册上下文菜单registerForContextMenu()
        this.registerForContextMenu(listview);
    }

    // 添加上下文菜单内容onCreateContextMenu（）
    @Override
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {

        super.onCreateContextMenu(menu, v, menuInfo);
        menu.setHeaderTitle("Manage");
        menu.setHeaderIcon(R.drawable.ic_launcher);
        menu.add(1, 1, 1, "copy");
        menu.add(1, 2, 1, "cut");
        menu.add(1, 3, 1, "paste");
        menu.add(1, 4, 1, "rename");
    }

    // 设置菜单点击后响应事件onContextItemSelected()
    @Override
    public boolean onContextItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case 1:
            Toast.makeText(this, "copy finished", Toast.LENGTH_SHORT).show();

            break;

        case 2:
            Toast.makeText(this, "cut finished", Toast.LENGTH_SHORT).show();
            break;
        case 3:
            Toast.makeText(this, "paste finished", Toast.LENGTH_SHORT).show();
            break;
        case 4:
            Toast.makeText(this, "rename finished", Toast.LENGTH_SHORT).show();
            break;
        }
        return super.onContextItemSelected(item);
    }

    public ArrayList getdata() {
        ArrayList list = new ArrayList();
        for (int i = 0; i < 5; i++) {
            list.add("文件" + (i + 1));
        }
        return list;

    }

}

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• 可以加载xml文件中的菜单项

参考选项菜单引入xml文件

getMenuInflater().inflate(R.menu.main, menu);