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   源码介绍

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package cn.itcast.mobilesafe.ui;

import java.util.List;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.os.Bundle;
import android.text.InputType;
import android.text.TextUtils;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView.AdapterContextMenuInfo;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import cn.itcast.mobilesafe.R;
import cn.itcast.mobilesafe.db.dao.BlackNumberDao;

public class CallSmsActivity extends Activity {
	
	

	private ListView lv_call_sms_safe;
	private Button bt_add_black_number;
	private BlackNumberDao dao;
	private List<String> numbers;
	private CallSmsAdapter adapter;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		
		setContentView(R.layout.call_sms_safe);
		dao = new BlackNumberDao(this);
		
		// 给listview注册上下文菜单
		lv_call_sms_safe = (ListView) this.findViewById(R.id.lv_call_sms_safe);
		
		
		// 给listview注册上下文菜单
		registerForContextMenu(lv_call_sms_safe);
		bt_add_black_number = (Button) this.findViewById(R.id.bt_add_black_number);
		
		//添加黑名单按钮
		bt_add_black_number.setOnClickListener(new OnClickListener() 
		{
			public void onClick(View v) {
				AlertDialog.Builder builder = new Builder(CallSmsActivity.this);
				builder.setTitle("添加黑名单号码");
				final EditText et = new EditText(CallSmsActivity.this);
				
				et.setInputType(InputType.TYPE_CLASS_PHONE);
				
				builder.setView(et);
				
				builder.setPositiveButton("添加", new DialogInterface.OnClickListener() {
					public void onClick(DialogInterface dialog, int which) {
						
						String number =  et.getText().toString().trim();
						if(TextUtils.isEmpty(number)){
							Toast.makeText(getApplicationContext(), "黑名单号码不能为空", 1).show();
							return ;
						}else{
							dao.add(number);
							//todo: 通知listview更新数据
							// 缺点: 重新刷新整个listview 
//							numbers = dao.getAllNumbers();
//							lv_call_sms_safe.setAdapter(new ArrayAdapter<String>(CallSmsActivity.this, R.layout.blacknumber_item, R.id.tv_blacknumber_item, numbers));
							numbers = dao.getAllNumbers();
							
							// 让数据适配器通知listview更新数据 
							adapter.notifyDataSetChanged();
						
						}
						
					}
				});
				builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
					
					public void onClick(DialogInterface dialog, int which) {
						
					}
				});
				builder.create().show();
			}
		});
		numbers = dao.getAllNumbers();
		//adapter = new ArrayAdapter<String>(this, R.layout.blacknumber_item, R.id.tv_blacknumber_item, numbers);
		adapter = new CallSmsAdapter();
		
		lv_call_sms_safe.setAdapter(adapter);
	}

	//长安弹出式菜单，这是一个回调函数
	@Override
	public void onCreateContextMenu(ContextMenu menu, View v,
			ContextMenuInfo menuInfo) {
		// TODO Auto-generated method stub
		super.onCreateContextMenu(menu, v, menuInfo);
		
		 MenuInflater inflater = getMenuInflater();
		 inflater.inflate(R.menu.context_menu, menu);//
	}
	
	
	//对菜单中各项的相应
	@Override
	public boolean onContextItemSelected(MenuItem item) {
		// TODO Auto-generated method stub
		AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
		  int id = (int) info.id;//当前项的key表示,独一无二的
		  String number = numbers.get(id);
		  switch (item.getItemId()) 
		  {
			  case R.id.update_number:
				  
				  updataNumber(number);
				  break;
			  case R.id.delete_number:
				  // 当前条目的id
	
				  dao.delete(number);
				  // 重新获取黑名单号码
				  numbers = dao.getAllNumbers();
				  //  通知listview更新界面
				  adapter.notifyDataSetChanged();
				  break;
			  case R.id.display_number:
				  // 当前条目的id
				  Toast.makeText(getApplicationContext(), "选中的号码为" number, Toast.LENGTH_LONG);
				  
				  break;	  

		  }
		return false;
		
	}
	
	
	
	/**
	 * 更新黑名单号码
	 * @param number
	 */
	private void updataNumber(final String oldnumber) {
		
		AlertDialog.Builder builder = new Builder(CallSmsActivity.this);
		builder.setTitle("更改黑名单号码");
		final EditText et = new EditText(CallSmsActivity.this);
		et.setInputType(InputType.TYPE_CLASS_PHONE);
		builder.setView(et);
		builder.setPositiveButton("更改", new DialogInterface.OnClickListener() {
			public void onClick(DialogInterface dialog, int which) {
				
				String newNumber =  et.getText().toString().trim();
				if(TextUtils.isEmpty(newNumber)){
					Toast.makeText(getApplicationContext(), "黑名单号码不能为空", 1).show();
					return ;
				}else{
					dao.update(oldnumber, newNumber);
					//todo: 通知listview更新数据
					// 缺点: 重新刷新整个listview 
//					numbers = dao.getAllNumbers();
//					lv_call_sms_safe.setAdapter(new ArrayAdapter<String>(CallSmsActivity.this, R.layout.blacknumber_item, R.id.tv_blacknumber_item, numbers));
					numbers = dao.getAllNumbers();
					
					// 让CallSmsAdapter数据适配器通知listview更新数据 
					//notifyDataSetChanged方法通过一个外部的方法控制如果适配器的内容改变时需要强制调用getView来刷新每个Item的内容。
					adapter.notifyDataSetChanged();
				
				}
				
			}
		});
		builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
			
			public void onClick(DialogInterface dialog, int which) {
				
			}
		});
		builder.create().show();
		
	}
	//电话适配器
	private class CallSmsAdapter extends BaseAdapter{

		public int getCount() {
			// TODO Auto-generated method stub
			return numbers.size();
		}

		public Object getItem(int position) {
			// TODO Auto-generated method stub
			return numbers.get(position);
		}

		public long getItemId(int position) {
			// TODO Auto-generated method stub
			return position;
		}

		public View getView(int position, View convertView, ViewGroup parent) {
			
			
			View view = View.inflate(CallSmsActivity.this, R.layout.blacknumber_item, null);
			TextView tv = (TextView) view.findViewById(R.id.tv_blacknumber_item);
			tv.setText(numbers.get(position));
			return view;
		}

	}

}