ContextMenu初体验

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MAinActivity.class

package com.superxingyun.contextmenu;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.ContextMenu;import android.view.MenuItem;import android.view.View;import android.widget.ArrayAdapter;import android.widget.ListView;import android.widget.Toast;import java.util.ArrayList;public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        showListView();    }    /**     * 设置listView显示内容     */    private void showListView(){        ListView listView = (ListView) findViewById(R.id.listView);        ArrayAdapter <String> adapter = new ArrayAdapter <String> (this, android.R.layout.simple_list_item_1, getData());        listView.setAdapter(adapter);        this.registerForContextMenu(listView);    }    @Override    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {        super.onCreateContextMenu(menu, v, menuInfo);        //设置Menu显示的内容        menu.setHeaderTitle("文件操作");        menu.setHeaderIcon(R.mipmap.ic_launcher);        menu.add(1, 0, 1, "复制");        menu.add(1, 1, 1, "粘贴");        menu.add(1, 2, 1, "剪切");        menu.add(1, 3, 1, "重命名");    }    @Override    public boolean onContextItemSelected(MenuItem item) {        switch (item.getItemId()){            case 0:{                Toast.makeText(this, "这是复制", Toast.LENGTH_SHORT).show();                break;            }            case 1:{                Toast.makeText(this, "这是粘贴", Toast.LENGTH_SHORT).show();                break;            }            case 2:{                Toast.makeText(this, "这是剪切", Toast.LENGTH_SHORT).show();                break;            }            case 3:{                Toast.makeText(this, "这是重命名", Toast.LENGTH_SHORT).show();                break;            }        }        return super.onContextItemSelected(item);    }    /**     *构造ListView显示的数据     */    private ArrayList<String> getData(){        ArrayList<String> list = new ArrayList<>();        for (int i = 0; i < 5; i++){            list.add("文件" + (i + 1));        }        return list;    }}

这里面item时通过代码的方式动态加载的，也可以通过xml布局文件静态加载
activity_main.xml

<?xml version="1.0" encoding="utf-8"?><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="com.superxingyun.contextmenu.MainActivity">    <ListView        android:id="@+id/listView"        android:layout_width="match_parent"        android:layout_height="match_parent">    </ListView></RelativeLayout>

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