Android开发之中的一个个简单的通讯录实现（源代码）

通讯录就是一个ListView。我们须要通过数据库和ContentProvider来活动通讯录的数据。当然，我们应该提供选中后编辑的功能。

非常easy的一个通讯略Demo，所以。直接上代码，须要的看一下就知道。

不解释。

文件1： MyContacs

主活动页面。

package com.yarin.android.MyContacts;

import android.app.ListActivity;
import android.content.ComponentName;
import android.content.ContentUris;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
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.AdapterView;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;

public class MyContacts extends ListActivity{
	private static final int AddContact_ID = Menu.FIRST;
	//private static final int EditContact_ID = Menu.FIRST+1;
	private static final int DELEContact_ID = Menu.FIRST+2;
	private static final int EXITContact_ID = Menu.FIRST+3;
	
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setDefaultKeyMode(DEFAULT_KEYS_SHORTCUT);
		
        Intent intent = getIntent();
        if (intent.getData() == null) {
            intent.setData(ContactsProvider.CONTENT_URI);
        }

        getListView().setOnCreateContextMenuListener(this);

        Cursor cursor = managedQuery(getIntent().getData(), ContactColumn.PROJECTION, null, null,null);

        //注冊每一个列表表示形式 ：姓名 + 移动电话
        SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,
			android.R.layout.simple_list_item_2,
			cursor,
			new String[] {ContactColumn.NAME, ContactColumn.MOBILENUM },
			new int[] { android.R.id.text1, android.R.id.text2 });

        setListAdapter(adapter);
	}

    public boolean onCreateOptionsMenu(Menu menu) 
    {
        super.onCreateOptionsMenu(menu);
        //加入联系人
        menu.add(0, AddContact_ID, 0, R.string.add_user)
        	.setShortcut('3', 'a')
        	.setIcon(R.drawable.add);
        
        Intent intent = new Intent(null, getIntent().getData());
        intent.addCategory(Intent.CATEGORY_ALTERNATIVE);
        menu.addIntentOptions(Menu.CATEGORY_ALTERNATIVE, 0, 0,
                new ComponentName(this, MyContacts.class), null, intent, 0, null);

        //退出程序
        menu.add(0, EXITContact_ID, 0, R.string.exit)
    		.setShortcut('4', 'd')
    		.setIcon(R.drawable.exit);
        return true;
        
    }
    
    //处理菜单操作
    public boolean onOptionsItemSelected(MenuItem item) 
    {
        switch (item.getItemId()) 
        {
        case AddContact_ID:
            //加入联系人
            startActivity(new Intent(Intent.ACTION_INSERT, getIntent().getData()));
            return true;
        case EXITContact_ID:
        	//退出程序
        	this.finish();
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
    
    public boolean onPrepareOptionsMenu(Menu menu)
	{
		super.onPrepareOptionsMenu(menu);
		final boolean haveItems = getListAdapter().getCount() > 0;

		if (haveItems)
		{
			
			Uri uri = ContentUris.withAppendedId(getIntent().getData(), getSelectedItemId());

			Intent[] specifics = new Intent[2];
			specifics[0] = new Intent(Intent.ACTION_EDIT, uri);
			specifics[1] = new Intent(Intent.ACTION_VIEW, uri);
			MenuItem[] items = new MenuItem[2];
				
			//加入满足条件的菜单
			Intent intent = new Intent(null, uri);
			intent.addCategory(Intent.CATEGORY_ALTERNATIVE);
			menu.addIntentOptions(Menu.CATEGORY_ALTERNATIVE, 0, 0, null, specifics, intent, 0, items);

			if (items[0] != null)
			{
				//编辑联系人
				items[0].setShortcut('1', 'e').setIcon(R.drawable.edituser).setTitle(R.string.editor_user);   
			}
			if (items[1] != null)
			{
				//查看联系人
				items[1].setShortcut('2', 'f').setTitle(R.string.view_user).setIcon(R.drawable.viewuser);   
			}
		}
		else
		{
			menu.removeGroup(Menu.CATEGORY_ALTERNATIVE);
		}
		return true;
	}
    //动态菜单处理
    //点击的默认操作也能够在这里处理
    protected void onListItemClick(ListView l, View v, int position, long id)   
    {   
        Uri uri = ContentUris.withAppendedId(getIntent().getData(), id);   
  
        String action = getIntent().getAction();   
        if ( Intent.ACTION_EDIT.equals(action) )
		{
        	//编辑联系人
        	startActivity(new Intent(Intent.ACTION_EDIT, uri));  
		}  
        else
        {     
        	//查看联系人
        	startActivity(new Intent(Intent.ACTION_VIEW, uri));       
        }  
    }   
    
    //长按触发的菜单
	public void onCreateContextMenu(ContextMenu menu, View view, ContextMenuInfo menuInfo)
	{
		AdapterView.AdapterContextMenuInfo info;
		try
		{
			info = (AdapterView.AdapterContextMenuInfo) menuInfo;
		}
		catch (ClassCastException e)
		{
			return;
		}
		//得到长按的数据项
		Cursor cursor = (Cursor) getListAdapter().getItem(info.position);
		if (cursor == null)
		{
			return;
		}

		menu.setHeaderTitle(cursor.getString(1));
		//加入删除菜单
		menu.add(0, DELEContact_ID, 0, R.string.delete_user);
	}
    
    @Override
    public boolean onContextItemSelected(MenuItem item){
		AdapterView.AdapterContextMenuInfo info;
		try{
			info = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo();
		}catch (ClassCastException e){
			return false;
		}

		switch (item.getItemId()){
			case DELEContact_ID:{
				//删除一条记录
				Uri noteUri = ContentUris.withAppendedId(getIntent().getData(), info.id);
				getContentResolver().delete(noteUri, null, null);
				return true;
			}
		}
		return false;
	}
}

文件2  DBHelper

数据库相关操作。

package com.yarin.android.MyContacts;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

public class DBHelper extends SQLiteOpenHelper
{
	public static final String DATABASE_NAME = "mycontacts.db";//数据库名
	public static final int DATABASE_VERSION = 2;				 //版本号
	public static final String CONTACTS_TABLE = "contacts";	 //表名
	//创建表
	private static final String DATABASE_CREATE = 
		"CREATE TABLE " + CONTACTS_TABLE +" ("					
		+ ContactColumn._ID+" integer primary key autoincrement,"
		+ ContactColumn.NAME+" text,"
		+ ContactColumn.MOBILENUM+" text,"
		+ ContactColumn.HOMENUM+" text,"
		+ ContactColumn.ADDRESS+" text,"
		+ ContactColumn.EMAIL+" text,"
		+ ContactColumn.BLOG+" text);";
	public DBHelper(Context context)
	{
		super(context, DATABASE_NAME, null, DATABASE_VERSION);
	}
	public void onCreate(SQLiteDatabase db)
	{
		db.execSQL(DATABASE_CREATE);
	}
	public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
	{
		db.execSQL("DROP TABLE IF EXISTS " + CONTACTS_TABLE);
		onCreate(db);
	}
}

文件3 ContentsProvider

内容提供

package com.yarin.android.MyContacts;

import android.content.ContentProvider;
import android.content.ContentUris;
import android.content.ContentValues;
import android.content.UriMatcher;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteQueryBuilder;
import android.net.Uri;
import android.text.TextUtils;

public class ContactsProvider extends ContentProvider{
	private DBHelper dbHelper;
	private SQLiteDatabase contactsDB;
	
	public static final String AUTHORITY = "com.yarin.android.provider.ContactsProvider";
	public static final String CONTACTS_TABLE = "contacts";
	public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/"+CONTACTS_TABLE);
	
	/*=====================================================*/
	//以下是自己定义的类型
	public static final int CONTACTS = 1;
	public static final int CONTACT_ID = 2;
	private static final UriMatcher uriMatcher;	
	static
	{
		uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
		uriMatcher.addURI(AUTHORITY,"contacts",CONTACTS);
		//单独列
		uriMatcher.addURI(AUTHORITY,"contacts/#",CONTACT_ID);
	}
	/*=====================================================*/
	
	@Override
	public boolean onCreate()
	{
		dbHelper = new DBHelper(getContext());
		//运行创建数据库
		contactsDB = dbHelper.getWritableDatabase();
		return (contactsDB == null) ?
 false : true;
	}
	
	// 删除指定数据列
	@Override
	public int delete(Uri uri, String where, String[] selectionArgs)
	{
		int count;
		switch (uriMatcher.match(uri))
		{
			case CONTACTS:
				count = contactsDB.delete(CONTACTS_TABLE, where, selectionArgs);
				break;
			case CONTACT_ID:
				String contactID = uri.getPathSegments().get(1);
				count = contactsDB.delete(CONTACTS_TABLE, 
										  ContactColumn._ID 
										  + "=" + contactID 
										  + (!TextUtils.isEmpty(where) ? " AND (" + where + ")" : ""),
										  selectionArgs);
				break;
			default:
				throw new IllegalArgumentException("Unsupported URI: " + uri);
		}
		getContext().getContentResolver().notifyChange(uri, null);
		return count;
	}
	
	// URI类型转换
	public String getType(Uri uri)
	{
		switch (uriMatcher.match(uri))
		{
			case CONTACTS:
				return "vnd.android.cursor.dir/vnd.yarin.android.mycontacts";
			case CONTACT_ID:
				return "vnd.android.cursor.item/vnd.yarin.android.mycontacts";
			default:
				throw new IllegalArgumentException("Unsupported URI: " + uri);
		}
	}
	
	// 插入数据
	public Uri insert(Uri uri, ContentValues initialValues)
	{
		if (uriMatcher.match(uri) != CONTACTS)
		{
			throw new IllegalArgumentException("Unknown URI " + uri);
		}
		ContentValues values;
		if (initialValues != null)
		{
			values = new ContentValues(initialValues);
		}
		else
		{
			values = new ContentValues();
		}
		// 设置默认值
		if (values.containsKey(ContactColumn.NAME) == false)
		{
			values.put(ContactColumn.NAME, "");
		}
		if (values.containsKey(ContactColumn.MOBILENUM) == false)
		{
			values.put(ContactColumn.MOBILENUM, "");
		}
		if (values.containsKey(ContactColumn.HOMENUM) == false)
		{
			values.put(ContactColumn.HOMENUM, "");
		}
		if (values.containsKey(ContactColumn.ADDRESS) == false)
		{
			values.put(ContactColumn.ADDRESS, "");
		}
		if (values.containsKey(ContactColumn.EMAIL) == false)
		{
			values.put(ContactColumn.EMAIL, "");
		}
		if (values.containsKey(ContactColumn.BLOG) == false)
		{
			values.put(ContactColumn.BLOG, "");
		}
		long rowId = contactsDB.insert(CONTACTS_TABLE, null, values);
		if (rowId > 0)
		{
			Uri noteUri = ContentUris.withAppendedId(CONTENT_URI, rowId);
			getContext().getContentResolver().notifyChange(noteUri, null);
			return noteUri;
		}
		throw new SQLException("Failed to insert row into " + uri);
	}
	
	// 查询数据
	public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder)
	{
		SQLiteQueryBuilder qb = new SQLiteQueryBuilder();
		qb.setTables(CONTACTS_TABLE);

		switch (uriMatcher.match(uri))
		{
			case CONTACT_ID:
				qb.appendWhere(ContactColumn._ID + "=" + uri.getPathSegments().get(1));
				break;
			default:
				break;
		}
		String orderBy;
		if (TextUtils.isEmpty(sortOrder))
		{
			orderBy = ContactColumn._ID;
		}
		else
		{
			orderBy = sortOrder;
		}
		Cursor c = qb.query(contactsDB, projection, selection, selectionArgs, null, null, orderBy);
		c.setNotificationUri(getContext().getContentResolver(), uri);
		return c;
	}
	
	// 更新数据库
	public int update(Uri uri, ContentValues values, String where, String[] selectionArgs)
	{
		int count;
		switch (uriMatcher.match(uri))
		{
			case CONTACTS:
				count = contactsDB.update(CONTACTS_TABLE, values, where, selectionArgs);
				break;
			case CONTACT_ID:
				String contactID = uri.getPathSegments().get(1);
				count = contactsDB.update(CONTACTS_TABLE, values, ContactColumn._ID + "=" + contactID
						+ (!TextUtils.isEmpty(where) ?
 " AND (" + where + ")" : ""), selectionArgs);
				break;
			default:
				throw new IllegalArgumentException("Unsupported URI: " + uri);
		}
		getContext().getContentResolver().notifyChange(uri, null);
		return count;
	}
}

文件4 ContactView

package com.yarin.android.MyContacts;

import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;

public class ContactView extends Activity
{
	private TextView mTextViewName;
	private TextView mTextViewMobile;
	private TextView mTextViewHome;
	private TextView mTextViewAddress;
	private TextView mTextViewEmail;
	private TextView mTextViewBlog;
	
    private Cursor mCursor;
    private Uri mUri;
    
    private static final int REVERT_ID = Menu.FIRST;
    private static final int DELETE_ID = Menu.FIRST + 1;
    private static final int EDITOR_ID = Menu.FIRST + 2;
    private static final int CALL_ID = Menu.FIRST + 3;
    private static final int SENDSMS_ID = Menu.FIRST + 4;
	
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		
		mUri = getIntent().getData();
		
		this.setContentView(R.layout.viewuser);
		
		mTextViewName = (TextView) findViewById(R.id.TextView_Name);
		mTextViewMobile = (TextView) findViewById(R.id.TextView_Mobile);
		mTextViewHome = (TextView) findViewById(R.id.TextView_Home);
		mTextViewAddress = (TextView) findViewById(R.id.TextView_Address);
		mTextViewEmail = (TextView) findViewById(R.id.TextView_Email);
		mTextViewBlog = (TextView) findViewById(R.id.TextView_Blog);
		
	    // 获得并保存原始联系人信息
        mCursor = managedQuery(mUri, ContactColumn.PROJECTION, null, null, null);
        mCursor.moveToFirst();
	}
	
    protected void onResume()
	{
		super.onResume();
		if (mCursor != null)
		{
			// 读取并显示联系人信息
			mCursor.moveToFirst();
			
			mTextViewName.setText(mCursor.getString(ContactColumn.NAME_COLUMN));
			mTextViewMobile.setText(mCursor.getString(ContactColumn.MOBILENUM_COLUMN));
			mTextViewHome.setText(mCursor.getString(ContactColumn.HOMENUM_COLUMN));
			mTextViewAddress.setText(mCursor.getString(ContactColumn.ADDRESS_COLUMN));
			mTextViewEmail.setText(mCursor.getString(ContactColumn.EMAIL_COLUMN));
			mTextViewBlog.setText(mCursor.getString(ContactColumn.BLOG_COLUMN));
		}
		else
		{
			setTitle("错误信息");
		}
	}
    
    public boolean onCreateOptionsMenu(Menu menu)
	{
		super.onCreateOptionsMenu(menu);
		//加入菜单
		menu.add(0, REVERT_ID, 0, R.string.revert).setShortcut('0', 'r').setIcon(R.drawable.listuser);
		menu.add(0, DELETE_ID, 0, R.string.delete_user).setShortcut('0', 'd').setIcon(R.drawable.remove);
		menu.add(0, EDITOR_ID, 0, R.string.editor_user).setShortcut('0', 'd').setIcon(R.drawable.edituser);
		menu.add(0, CALL_ID, 0, R.string.call_user).setShortcut('0', 'd').setIcon(R.drawable.calluser)
				.setTitle(this.getResources().getString(R.string.call_user));
		menu.add(0, SENDSMS_ID, 0, R.string.sendsms_user).setShortcut('0', 'd').setIcon(R.drawable.sendsms)
		.setTitle(this.getResources().getString(R.string.sendsms_user));
		return true;
	}
    
    public boolean onOptionsItemSelected(MenuItem item)
	{
		switch (item.getItemId())
		{
			//删除
			case DELETE_ID:
				deleteContact();
				finish();
				break;
			//返回列表
			case REVERT_ID:
				setResult(RESULT_CANCELED);
				finish();
				break;
			case EDITOR_ID:
			//编辑联系人
				startActivity(new Intent(Intent.ACTION_EDIT, mUri)); 
				break;
			case CALL_ID:
			//呼叫联系人
		        Intent call = new Intent(Intent.ACTION_CALL,Uri.parse("tel:"+mTextViewMobile.getText()));
		        startActivity(call);
				break;
			case SENDSMS_ID:
			//发短信给联系人
		        Intent sms = new Intent(Intent.ACTION_SENDTO,Uri.parse("smsto:"+mTextViewMobile.getText()));
		        startActivity(sms);
				break;
		}
		return super.onOptionsItemSelected(item);
	}


	// 删除联系人信息
	private void deleteContact()
	{
		if (mCursor != null)
		{
			mCursor.close();
			mCursor = null;
			getContentResolver().delete(mUri, null, null);
			setResult(RESULT_CANCELED);
		}
	}
}

文件5 ContactColumn

数据表定义

package com.yarin.android.MyContacts;

import android.provider.BaseColumns;

//定义数据
public class ContactColumn implements BaseColumns{
	public ContactColumn(){}
	//列名
	public static final String NAME = "name";				//姓名
	public static final String MOBILENUM = "mobileNumber";//移动电话
	public static final String HOMENUM = "homeNumber";	//家庭电话
	public static final String ADDRESS = "address";		//地址
	public static final String EMAIL = "email";			//邮箱
	public static final String BLOG = "blog";				//博客
	//列 索引值
	public static final int _ID_COLUMN = 0;
	public static final int NAME_COLUMN = 1;
	public static final int MOBILENUM_COLUMN = 2;
	public static final int HOMENUM_COLUMN = 3;
	public static final int ADDRESS_COLUMN = 4;
	public static final int EMAIL_COLUMN = 5;
	public static final int BLOG_COLUMN = 6;

	//查询结果
	public static final String[] PROJECTION ={
		_ID,
		NAME,
		MOBILENUM,
		HOMENUM,
		ADDRESS,
		EMAIL,
		BLOG,
	};
}

文件6 

编辑状态下的页面

package com.yarin.android.MyContacts;

import android.app.Activity;
import android.content.ContentValues;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class ContactEditor extends Activity{

	private static final int STATE_EDIT = 0;
    private static final int STATE_INSERT = 1;
    
    private static final int REVERT_ID = Menu.FIRST;
    private static final int DISCARD_ID = Menu.FIRST + 1;
    private static final int DELETE_ID = Menu.FIRST + 2;
    
    private Cursor mCursor;
    private int mState;
    private Uri mUri;
    private EditText nameText;
    private EditText mobileText;
    private EditText homeText;
    private EditText addressText;
    private EditText emailText;
    private EditText blogText;
    
    private Button okButton;
    private Button cancelButton;
    
	public void onCreate(Bundle savedInstanceState) 
	{
        super.onCreate(savedInstanceState);

		final Intent intent = getIntent();
		final String action = intent.getAction();
		//依据action的不同进行不同的操作
		//编辑联系人
		if (Intent.ACTION_EDIT.equals(action))
		{
			mState = STATE_EDIT;
			mUri = intent.getData();
		}
		else if (Intent.ACTION_INSERT.equals(action))
		{
			//加入新联系人
			mState = STATE_INSERT;
			mUri = getContentResolver().insert(intent.getData(), null);

			if (mUri == null)
			{
				finish();
				return;
			}
			setResult(RESULT_OK, (new Intent()).setAction(mUri.toString()));

		}
		else
		{
			finish();
			return;
		}
        
        setContentView(R.layout.editorcontacts);
        
        nameText = (EditText) findViewById(R.id.EditText01);
        mobileText = (EditText) findViewById(R.id.EditText02);
        homeText = (EditText) findViewById(R.id.EditText03);
        addressText = (EditText) findViewById(R.id.EditText04);
        emailText = (EditText) findViewById(R.id.EditText05);
        blogText = (EditText) findViewById(R.id.EditText06);
        
        okButton = (Button)findViewById(R.id.Button01);
        cancelButton = (Button)findViewById(R.id.Button02);
        
        okButton.setOnClickListener(new OnClickListener()
        {
			public void onClick(View v) 
			{
				String text = nameText.getText().toString();
				if(text.length()==0)
				{
					//假设没有输入东西。则不加入记录
					setResult(RESULT_CANCELED);
					deleteContact();
					finish();
				}
				else
				{
					//加入一条数据
					updateContact();
				}
			}
        	
        });
        cancelButton.setOnClickListener(new OnClickListener()
        {
			public void onClick(View v) 
			{
				if(mState == STATE_INSERT)
				{
					//不加入记录
					setResult(RESULT_CANCELED);
					deleteContact();
					finish();
				}
				else
				{
					//恢复到编辑前的状态
					backupContact();
				}
			}
        });
        
        
        // 获得并保存原始联系人信息
        mCursor = managedQuery(mUri, ContactColumn.PROJECTION, null, null, null);
        mCursor.moveToFirst();
	}
	
	
    protected void onResume()
	{
		super.onResume();
		if (mCursor != null)
		{
			// 读取并显示联系人信息
			mCursor.moveToFirst();
			if (mState == STATE_EDIT)
			{
				setTitle(getText(R.string.editor_user));
			}
			else if (mState == STATE_INSERT)
			{
				setTitle(getText(R.string.add_user));
			}
			String name = mCursor.getString(ContactColumn.NAME_COLUMN);
			String moblie = mCursor.getString(ContactColumn.MOBILENUM_COLUMN);
			String home = mCursor.getString(ContactColumn.HOMENUM_COLUMN);
			String address = mCursor.getString(ContactColumn.ADDRESS_COLUMN);
			String email = mCursor.getString(ContactColumn.EMAIL_COLUMN);
			String blog = mCursor.getString(ContactColumn.BLOG_COLUMN);
			
			nameText.setText(name);
			mobileText.setText(moblie);
			homeText.setText(home);
			addressText.setText(address);
			emailText.setText(email);
			blogText.setText(blog);
		}
		else
		{
			setTitle("错误信息");
		}
	}
    
    protected void onPause()
	{
		super.onPause();
		if (mCursor != null)
		{
			String text = nameText.getText().toString();
			if (text.length() == 0)
			{
				setResult(RESULT_CANCELED);
				deleteContact();
				// 更新信息
			}
			else
			{
				ContentValues values = new ContentValues();
				values.put(ContactColumn.NAME, nameText.getText().toString());
				values.put(ContactColumn.MOBILENUM, mobileText.getText().toString());
				values.put(ContactColumn.HOMENUM, homeText.getText().toString());
				values.put(ContactColumn.ADDRESS, addressText.getText().toString());
				values.put(ContactColumn.EMAIL, emailText.getText().toString());
				values.put(ContactColumn.BLOG, blogText.getText().toString());
				
				getContentResolver().update(mUri, values, null, null);
			}
		}
	}
    
    public boolean onCreateOptionsMenu(Menu menu) 
    {
        super.onCreateOptionsMenu(menu);

        if (mState == STATE_EDIT) 
        {
            menu.add(0, REVERT_ID, 0, R.string.revert)
                    .setShortcut('0', 'r')
                    .setIcon(R.drawable.listuser);
            menu.add(0, DELETE_ID, 0, R.string.delete_user)
            .setShortcut('0', 'f')
            .setIcon(R.drawable.remove);
        } 
        else 
        {
            menu.add(0, DISCARD_ID, 0, R.string.revert)
                    .setShortcut('0', 'd')
                    .setIcon(R.drawable.listuser);
        }
        return true;
    }
    //菜单处理
	@Override
    public boolean onOptionsItemSelected(MenuItem item) 
	{
        switch (item.getItemId()) 
        {
        case DELETE_ID:
        	deleteContact();
            finish();
            break;
        case DISCARD_ID:
        	cancelContact();
            break;
        case REVERT_ID:
        	backupContact();
            break;
        }
        return super.onOptionsItemSelected(item);
    }
	
	//删除联系人信息
	private void deleteContact() 
	{
		if (mCursor != null) 
		{
            mCursor.close();
            mCursor = null;
            getContentResolver().delete(mUri, null, null);
            nameText.setText("");
        }
	}
	//丢弃信息
	private void cancelContact() 
	{
		if (mCursor != null) 
		{
			deleteContact();
        }
        setResult(RESULT_CANCELED);
        finish();
	}
	//更新 变更的信息
	private void updateContact() 
	{
		if (mCursor != null) 
		{
			mCursor.close();
            mCursor = null;
            ContentValues values = new ContentValues();
			values.put(ContactColumn.NAME, nameText.getText().toString());
			values.put(ContactColumn.MOBILENUM, mobileText.getText().toString());
			values.put(ContactColumn.HOMENUM, homeText.getText().toString());
			values.put(ContactColumn.ADDRESS, addressText.getText().toString());
			values.put(ContactColumn.EMAIL, emailText.getText().toString());
			values.put(ContactColumn.BLOG, blogText.getText().toString());
            getContentResolver().update(mUri, values, null, null);
        }
        setResult(RESULT_CANCELED);
        finish();
	}
	//取消用，回退到最初的信息
	private void backupContact() 
	{
		if (mCursor != null) 
		{
			mCursor.close();
            mCursor = null;
            ContentValues values = new ContentValues();
			values.put(ContactColumn.NAME, nameText.getText().toString());
			values.put(ContactColumn.MOBILENUM, mobileText.getText().toString());
			values.put(ContactColumn.HOMENUM, homeText.getText().toString());
			values.put(ContactColumn.ADDRESS, addressText.getText().toString());
			values.put(ContactColumn.EMAIL, emailText.getText().toString());
			values.put(ContactColumn.BLOG, blogText.getText().toString());
            getContentResolver().update(mUri, values, null, null);
        }
        setResult(RESULT_CANCELED);
        finish();
	}
}