android项目--超级简单的android通讯录

哥最近做了一个小项目《铁哥们通讯录》，作为练手项目给大家分享一下。
功能也很简单，一个主界面，然后在主界面弹出一个添加界面，一个信息列表。
其中只用到了1个activity，1个sqlite帮助类。

下面是activity类

   

 
 
 
 

 

package com.feelling.ui;
 
import java.util.ArrayList; 
 
import com.woz.util.Config;
import com.woz.util.DataBaseHelper;
 
import android.app.AlertDialog;
import android.content.ContentValues;
import android.content.DialogInterface;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener; 
import android.widget.Button;
import android.widget.EditText; 


/**** 
 * @production  铁哥们通讯录
 * @company     android技术帮--【技术成就梦想】
 * @department  群号:85506951
 * @author      良仔(qq:953486326)
 * {@docRoot    通讯录的启动初始化界面 }
 * @version     1.0
 * @since       2011\9\21
 * @see         欢迎对android感兴趣的童鞋加入android技术帮，共同学习，共同进步！
 * ****/

public class MainActivity extends ProDialogImp {
    /** Called when the activity is first created. */
	//---------- main ----------------
	Button addButton,queryButton;  // 按钮-添加，查询
	//---------- add user ----------------  
	EditText username,phone; 
	String   userStr,phoneStr;
	//----------- list user -----------------------
    
	@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main); 
    	// main
    	addButton = (Button)findViewById(R.id.addUserBtn);
    	queryButton = (Button)findViewById(R.id.listUserBtn);  
    	
        // 添加
        addButton.setOnClickListener(new OnClickListener(){
			@Override
			public void onClick(View v) {
				  // 这里直接跳到添加的ui中去
				//  setContentView(R.layout.add_user); 
				 LayoutInflater inflater = getLayoutInflater();
				 View layout = inflater.inflate(R.layout.add_user, (ViewGroup)findViewById(R.id.dialog));
				 
				   // 内容元素
				   username = (EditText)layout.findViewById(R.id.userNameET);
			       phone = (EditText)layout.findViewById(R.id.phoneNumberET); 
				 new AlertDialog.Builder(MainActivity.this).setTitle("添加联系人").setView(layout)
			     .setPositiveButton("确定",  new DialogInterface.OnClickListener() { //添加事件
				     	public void onClick(DialogInterface dialog, int which) {
				     		  // 这里直接跳到添加的ui中去 
							  System.out.println(" on insert table user ---> ");   
							  DataBaseHelper dbHelper = new DataBaseHelper(MainActivity.this,Config.DB_NAME);
				              SQLiteDatabase sdb = dbHelper.getWritableDatabase();
				             
				              // put value 
				              userStr = username.getText().toString();
				              phoneStr = phone.getText().toString();
				              if(userStr!=null&&phoneStr!=null){
				            	   ContentValues cv = new ContentValues();
				                   // cv.put("id", 1);
				                   cv.put("title", userStr);
				                   cv.put("content", phoneStr);
				                   sdb.insert(Config.TABLE_NAME, null, cv); 
				                   showAlert("数据添加成功!");
				              }else{
				            	   showAlert("数据数据格式错误，请重新输入!");
				              } 
					  }}).setNegativeButton("取消", null).show();  
			        }
			});
       
        // 查询
        queryButton.setOnClickListener(new OnClickListener(){
			@Override
			public void onClick(View v) {
				 
				DataBaseHelper dbHelper = new DataBaseHelper(MainActivity.this,Config.DB_NAME);
		        SQLiteDatabase db = dbHelper.getReadableDatabase();
		        Cursor  cs = db.query(Config.TABLE_NAME, new String[]{"_id","title","content"}, null, null, null, null, null); 
		         
		        ArrayList<String> alist = new ArrayList<String>();
		        while(cs.moveToNext()){
	            	  int id = cs.getInt(cs.getColumnIndex("_id")); 
	            	  String name = cs.getString(cs.getColumnIndex("title"));
	            	  String con = cs.getString(cs.getColumnIndex("content"));
	            	  alist.add(id+"."+name+"["+con+"]"); 
	            	  System.out.println(" query [t_note]--> id = "+ id +" name = " + name +" con = " + con  );
	              } 
		          final    String[] contacts = new String[alist.size()]; 
		          for(int a=0;a<alist.size();a++){
		        	  contacts[a] = alist.get(a);
		          }
		             
		        new AlertDialog.Builder(MainActivity.this).setTitle("内容列表").setIcon(
						android.R.drawable.ic_dialog_info).setItems(   
						contacts, 
						new DialogInterface.OnClickListener() {
							public void onClick(DialogInterface dialog, int which) {
								//dialog.dismiss();
							   String 	artId = contacts[which].substring(0, 1);
							   alertDeleteOpt(artId);
							   //  showAlert("msg --> " + artId);
							}
						}) 
						.setNegativeButton("取消", null).show();
		        
		     /*   ListAdapter listapt = new SimpleCursorAdapter(MainActivity.this,
		        		    android.R.layout.simple_expandable_list_item_1,
		        		    cs,
		        		    new String[]{"title"},
		        		    new int[]{android.R.id.text1} );
		        
		        ListView  listUser = new ListView(MainActivity.this);  
		        listUser.setAdapter(listapt);
		        setContentView(listUser);  */
			}
        }); 
    }  
	// 删除数据
	public void deleteData(String id){
		  DataBaseHelper dbHelper = new DataBaseHelper(MainActivity.this,Config.DB_NAME);
		  SQLiteDatabase sdb = dbHelper.getWritableDatabase();
		  sdb.delete(Config.TABLE_NAME,  " _id=?", new String[]{id}); //删除数据 
	}
	 
	/**
	 *   删除操作
	 */
	public void alertDeleteOpt(final String id){  
		new AlertDialog.Builder(this)
		    .setCancelable(false)
		    .setMessage("您确定要删除这条信息吗？")
		    .setPositiveButton("确定", new DialogInterface.OnClickListener() {
		     	public void onClick(DialogInterface dialog, int which) {
		     	    deleteData(id);
			 }})
			 .setNegativeButton("取消", new DialogInterface.OnClickListener() {
			     	public void onClick(DialogInterface dialog, int which) {
						 dialog.cancel();
			 }})
			 .show(); 
	}  
	  //退出程序
	  @Override
		public boolean onKeyDown(int keyCode, KeyEvent event) { 
			 if (keyCode == KeyEvent.KEYCODE_BACK)// 返回按键 
			 {			 
				   new AlertDialog.Builder(this)
				    .setCancelable(false)
				    .setIcon(android.R.drawable.btn_star)
				    .setTitle("退出")
				    .setMessage("您确认要退出程序吗？")
				    .setPositiveButton("确定", new DialogInterface.OnClickListener() {
				     	public void onClick(DialogInterface dialog, int which) { 
				     		 MainActivity.this.finish();    //关闭程序的核心方法
					 }})
					 .setNegativeButton("取消", new DialogInterface.OnClickListener() {
					     	public void onClick(DialogInterface dialog, int which) {
								 dialog.cancel();
					 }})
					 .show();
			 }
			return true;
		}  
}
 

下面sqlite帮助类，其他的不太重要，所以就放到附件了，欢迎大家下载共同讨论学习。

package com.woz.util;
 
 
import android.content.Context; 
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteDatabase.CursorFactory; 
  
/**** 
 * @production  铁哥们通讯录
 * @company     android技术帮--【技术成就梦想】
 * @department  群号:85506951
 * @author      良仔(qq:953486326)
 * {@docRoot    访问sqlite数据的助手类 
 * 创建了一个note记录表
 * 
 * _id,     主键
 * title,  标题     
 * content,内容    }
 * @version     1.0
 * @since       2011\9\21
 * @see         欢迎对android感兴趣的童鞋加入android技术帮，共同学习，共同进步！
 * ****/
public class DataBaseHelper extends SQLiteOpenHelper {
 
 public DataBaseHelper(Context context, String name, CursorFactory factory,
   int version) {
  super(context, name, factory, version);
  // TODO Auto-generated constructor stub
 }
 public DataBaseHelper(Context context, String name,  
   int version) {
  this(context, name, null, version);
  // TODO Auto-generated constructor stub
 }
 public DataBaseHelper(Context context, String name) {
  this(context, name, Config.VERSION);
  // TODO Auto-generated constructor stub
 }
  
 @Override
 public void onCreate(SQLiteDatabase db) {
  // TODO Auto-generated method stub
        System.out.println(" create table --> ");
  // 执行创建
        db.execSQL("create table "+ Config.TABLE_NAME +
             "(_id INTEGER DEFAULT '1' NOT NULL PRIMARY KEY AUTOINCREMENT," +
             "title varchar(100)," +
             "content text)");  
 }
 @Override
 public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
  // TODO Auto-generated method stub
        System.out.println(" up grade datebase --> ");
        db.execSQL("drop table " + Config.TABLE_NAME);
        db.execSQL("create table "+ Config.TABLE_NAME +
             "(_id INTEGER DEFAULT '1' NOT NULL PRIMARY KEY AUTOINCREMENT," +
             "title varchar(100)," +
             "content text)");  
 } 
}

评论

1 楼 chenliang1234576 2012-10-20  

非空判断bug修复

if((userStr!=null&&userStr.length() > 0)&&(phoneStr!= null && phoneStr.length() > 0)){