ListView 与ContextMenu的关联管理

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<span style="font-family: Arial, Helvetica, sans-serif;">package com.example.listview;</span>

import java.io.BufferedReader;import java.io.FileNotFoundException;import java.io.FileReader;import java.io.IOException;import java.util.ArrayList;import java.util.List;import android.os.Bundle;import android.provider.Contacts.People;import android.support.v4.widget.SimpleCursorAdapter;import android.app.Activity;import android.content.Intent;import android.database.Cursor;import android.view.ContextMenu;import android.view.ContextMenu.ContextMenuInfo;import android.view.Menu;import android.view.MenuInflater;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.widget.AdapterView;import android.widget.AdapterView.AdapterContextMenuInfo;import android.widget.AdapterView.OnItemClickListener;import android.widget.ArrayAdapter;import android.widget.Button;import android.widget.ListAdapter;import android.widget.ListView;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends Activity {    private ListView listView;    int ItemSelectedId;    List<String>list=new ArrayList<String>();      String path="/sdcard/wifikey/wifikey.txt";//路径在此设置    @Override       protected void onCreate(Bundle savedInstanceState){        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                final Button bt=(Button)findViewById(R.id.bt);        final Button bt2=(Button)findViewById(R.id.bt2);        final TextView tv = (TextView)findViewById(R.id.tv);                     initListView();        listView =(ListView)findViewById(R.id.lv);                                    //由此网上为ListView的数组内容添加                bt.setOnClickListener(new OnClickListener(){@Overridepublic void onClick(View arg0) {showListView();}                });        bt2.setOnClickListener(new OnClickListener(){        public void onClick(View v){        Toast.makeText(MainActivity.this, "开发中……", Toast.LENGTH_SHORT).show();        }        });               registerForContextMenu(listView);                    listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {@Overridepublic boolean onItemLongClick(AdapterView<?> arg0, View arg1,int arg2, long arg3) {ItemSelectedId=arg2;return false;}});                           }        @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }    @Override    public void onCreateContextMenu(ContextMenu menu, View v,    ContextMenuInfo menuInfo) {    super.onCreateContextMenu(menu, v, menuInfo);    MenuInflater inflater=getMenuInflater();    inflater.inflate(R.menu.menu, menu);    }    @Override    public boolean onContextItemSelected(MenuItem item) {     switch(item.getItemId()){     case R.id.deleteTeam:     removeItem(ItemSelectedId);     showListView();     Toast.makeText(MainActivity.this, "删除"+ItemSelectedId, Toast.LENGTH_SHORT).show();         // listView.setAdapter(adapter);          break;     case R.id.noteTeam:     Toast.makeText(MainActivity.this, "备注", Toast.LENGTH_SHORT).show();     return true;     }     return false;    }    public void removeItem(int i){    list.remove(i);    showListView();    }    public void showListView(){          ArrayAdapter<String>adapter=new ArrayAdapter<String>(this,            R.layout.list,list);           listView.setAdapter(adapter);    }    public void initListView(){     list.add("one");

     list.add("two");        //去掉android    }}

<span style="font-size:24px;color:#ff0000;">今天通过写这个demo，又学到很多东西。</span>

<span style="font-size:24px;color:#ff0000;">例如变量，函数名起名非常重要。</span>

<span style="font-size:24px;color:#ff0000;">然后通过onItemLongClickListener()里面的第二个参数传给全局变量ItemSelectedId</span>

<span style="font-size:24px;color:#ff0000;">再通过contextmenu操作list数组的内容，实现ListView的动态管理。</span>

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