ContextMenu上下文菜单

上下文菜单一般是真针对ListView(多条数据的操作)

　　需求：在ListView中显示通话记录的电话号码，长按显示的上下文菜单为复制号码到拨号盘、发送信息、复制号码，与之相对应的事件。

　　

布局代码：

　　

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="vertical" >

     <ListView
         android:id="@+id/listview"
         android:layout_width="fill_parent"
         android:layout_height="fill_parent" />

 </LinearLayout>

MainActivity

 package com.android.hzy.contextmenu;
 import android.app.Activity;
 import android.content.Context;
 import android.content.Intent;
 import android.database.Cursor;
 import android.graphics.Color;
 import android.net.Uri;
 import android.os.Bundle;
 import android.provider.CallLog.Calls;
 import android.text.ClipboardManager;
 import android.view.ContextMenu;
 import android.view.ContextMenu.ContextMenuInfo;
 import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.AdapterView.AdapterContextMenuInfo;
 import android.widget.CursorAdapter;
 import android.widget.ListView;
 import android.widget.TextView;

 public class MainActivity extends Activity {

     private static final int MENU_DIAL_ID = 0;
     private static final int MENU_SMS_ID = 1;
     private static final int MENU_COPY_ID = 2;
     private ListView listview;
     private MyAdapter adapter;

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

         listview = (ListView) findViewById(R.id.listview);
         Cursor c = getContentResolver().query(Calls.CONTENT_URI, new String[]{Calls._ID,Calls.NUMBER}, null, null, null);
         adapter = new MyAdapter(this, c);
         // 如果数据是来自于手机本身的数据库   使用CursorAdapter的子类
         listview.setAdapter(adapter);

         // 给listview注册上下文菜单
         registerForContextMenu(listview);
     }

     /**
      * 创建上下文菜单
      */
     @Override
     public void onCreateContextMenu(ContextMenu menu, View v,
             ContextMenuInfo menuInfo) {
         // TODO Auto-generated method stub
         menu.add(0, MENU_DIAL_ID, 0, "复制号码到拨号盘");
         menu.add(0, MENU_SMS_ID, 0, "发送短信");
         menu.add(0, MENU_COPY_ID, 0, "复制号码");
         super.onCreateContextMenu(menu, v, menuInfo);
     }

     /**
      * 上下文菜单被选择
      */
     @Override
     public boolean onContextItemSelected(MenuItem item) {
         // TODO Auto-generated method stub
         AdapterContextMenuInfo acmi = (AdapterContextMenuInfo) item.getMenuInfo();
         int position = acmi.position;
         Cursor cursor = (Cursor) adapter.getItem(position);
         String number = cursor.getString(cursor.getColumnIndex(Calls.NUMBER)); 

         int id = item.getItemId();
         Intent intent = null;
         switch (id) {
         case MENU_DIAL_ID:
             intent = new Intent();
             intent.setAction(Intent.ACTION_DIAL);
             intent.setData(Uri.parse("tel:"+number));
             startActivity(intent);
             break;

         case MENU_SMS_ID:
             intent = new Intent();
             intent.setAction(Intent.ACTION_SENDTO);
             intent.setData(Uri.parse("smsto:"+number));
             startActivity(intent);
             break;

         case MENU_COPY_ID:
             // 得到剪贴版服务
             ClipboardManager cm = (ClipboardManager) getSystemService(Context.CLIPBOARD_SERVICE);
             // 将内容放到剪贴版本中
             cm.setText(number);
             break;

         default:
             break;
         }
         return super.onContextItemSelected(item);
     }

     private final class MyAdapter extends CursorAdapter{

         public MyAdapter(Context context, Cursor c) {
             super(context, c);
             // TODO Auto-generated constructor stub
         }

         // 创建item的布局
         @Override
         public View newView(Context context, Cursor cursor, ViewGroup parent) {
             // TODO Auto-generated method stub
             TextView tv = new TextView(context);
             tv.setTextSize(22);
             tv.setTextColor(Color.WHITE);

             return tv;
         }

         // 绑定数据
         @Override
         public void bindView(View view, Context context, Cursor cursor) {
             // TODO Auto-generated method stub
             // 得到数据 电话号码
             String number = cursor.getString(cursor.getColumnIndex(Calls.NUMBER));
             TextView tv = (TextView) view;
             tv.setText(number);
         }

     }
 }

注：清单文件中需要添加权限

<uses-permission android:name="android.permission.READ_CONTACTS"/>