android： ListView,及数据库操作，模拟实现 联系人功能

android： 模拟实现 联系人

前边包含一个头像图标，右侧是姓名 电话 既简单介绍，点击下方 添加联系人 添加，单击item显示电话 长按显示 编辑和 删除，删除之前有 提示是否删除 

如图

Mainactivity 的布局 listView 权重为1

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <ListView        android:id="@+id/gview"        android:layout_width="match_parent"        android:layout_height="0dp"        android:layout_weight="1" >    </ListView>    <Button        android:id="@+id/add_btn"        android:layout_width="match_parent"        android:layout_height="50dp"        android:text="添加新的联系人" /></LinearLayout>

listview布局格式

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="horizontal" >        <ImageView             android:id="@+id/gview_img"        android:layout_width="80dp"        android:layout_height="80dp"        android:src="@drawable/ic_launcher"/>        <LinearLayout             android:layout_width="0dp"            android:layout_height="80dp"            android:layout_weight="1"            android:orientation="vertical"            android:layout_margin="4dp">            <TextView                 android:layout_width="wrap_content"                android:layout_height="40dp"                android:id="@+id/gview_name"                android:text=""                />              <TextView                 android:layout_width="wrap_content"                android:layout_height="40dp"                android:id="@+id/gview_num"                android:text=""                />        </LinearLayout>       <TextView                 android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:layout_marginLeft="10dp"                android:layout_gravity="center"                android:id="@+id/gview_msg"                android:text=""                /></LinearLayout>

添加 联系人的 对话框 的 格式

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <EditText        android:id="@+id/contact_name"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_margin="4dp"        android:hint="姓名" />    <EditText        android:id="@+id/contact_num"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_margin="4dp"        android:hint="联系方式"        android:inputType="number"        android:maxLength="11" />    <EditText        android:id="@+id/contact_msg"        android:layout_width="match_parent"        android:layout_height="80dp"        android:layout_margin="4dp"        android:hint="详细信息" />    <Button        android:id="@+id/contact_save"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="保存"        /></LinearLayout>

Java代码部分

1.定义联系人的 属性

package com.example.contacttest;import android.R.string;/** * 定义联系人的一些属性 姓名电话 和简介 并封装 * @author Administrator * */public class Userinfo {private String nameString;private String num;private String msgString;public String getNameString() {return nameString;}public void setNameString(String nameString) {this.nameString = nameString;}public String getNum() {return num;}public void setNum(String string) {this.num = string;}public String getMsgString() {return msgString;}public void setMsgString(String msgString) {this.msgString = msgString;}}

2.定义数据库的辅助类

package com.example.contacttest;import android.content.Context;import android.database.sqlite.SQLiteDatabase;import android.database.sqlite.SQLiteOpenHelper;/** * 数据库的辅助类 *  * @author Administrator *  */public class Dbhelper extends SQLiteOpenHelper {// 数据库名字定义为为常量public final static String DB_NAME = "contact.db";// 数据库的版本号public final static int DB_VERSION = 1;// 表名public final static String TABLE_NAME = "contacts";// 定义单参的构造方法方便调用 public Dbhelper(Context context) {// Context context, String name, CursorFactory factory, int version// factory输入null,使用默认值super(context, DB_NAME, null, DB_VERSION);// 引入父类的构造方法不需要工厂。，}// 初次创建时 调用@Overridepublic void onCreate(SQLiteDatabase db) {// 创建表的操作db.execSQL("CREATE TABLE contacts(name vachar,num vachar,msg vachar)");}@Overridepublic void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {// TODO Auto-generated method stubString sql = "DROP TABLE IF EXISTS " + TABLE_NAME;db.execSQL(sql);onCreate(db);}}

3.定义数据库的 操作管理

package com.example.contacttest;import java.util.ArrayList;import java.util.List;import android.R.integer;import android.content.ContentValues;import android.content.Context;import android.database.Cursor;import android.database.sqlite.SQLiteDatabase;/** * 业务操作 增删改查 *  * @author Administrator *  */public class ContactManage {private Dbhelper mDbhelper;public final static String TABLE_NAME = "contacts";public final static String NAME = "name";public final static String NUM = "num";public final static String MSG = "msg";public ContactManage(Context context) {// 单参的 构造方法 传入上下文对象mDbhelper = new Dbhelper(context);}// 插入数据 传参public Boolean insert(Userinfo infUserinfo) {// 打开数据库 返回数据库对象SQLiteDatabase db = mDbhelper.getWritableDatabase();// 操作便于操作 定义表名和 列明 为常量 需要定义ContentValues 字段和值对应ContentValues cxValues = new ContentValues();cxValues.put(NAME, infUserinfo.getNameString());cxValues.put(NUM, infUserinfo.getNum());cxValues.put(MSG, infUserinfo.getMsgString());long a=db.insert(TABLE_NAME, null, cxValues);db.close();// 关闭        if (a!=0) {return true;       }         else return  false;       }// 删除public void delete(Userinfo infUserinfo) {// 打开数据库 返回数据库对象SQLiteDatabase db = mDbhelper.getWritableDatabase();// 删除 table, whereClause, whereArgs// 删除 table, whereClause, whereArgs 因为 可以是复合语句所以最后一个需要string【】 来存放多个字段db.delete(TABLE_NAME, "NAME=?",new String[] { infUserinfo.getNameString() });db.close();// 关闭}public void update(Userinfo infUserinfo) {// 打开数据库 返回数据库对象SQLiteDatabase db = mDbhelper.getWritableDatabase();ContentValues cxValues = new ContentValues();cxValues.put(NAME, infUserinfo.getNameString());cxValues.put(NUM, infUserinfo.getNum());cxValues.put(MSG, infUserinfo.getMsgString());      //  db.update(table, values, whereClause, whereArgs) 表名 值  后边两个 是判断条件 返回操作成功条数 ==1 判断？？db.update(TABLE_NAME, cxValues, "NAME=?", new String[] { infUserinfo.getNameString() });db.close();// 关闭}/** * 查询 */public List<Userinfo> getAll() {List<Userinfo> infList = new ArrayList<Userinfo>();SQLiteDatabase db = mDbhelper.getWritableDatabase();// 查询// db.query(table, columns, selection, selectionArgs, groupBy, having,// orderBy)Cursor cursor = db.query(TABLE_NAME, null, null, null, null, null, null);while (cursor.moveToNext()) {// 获得数据的方法getXXX 参数为 列的索引（下标） 由列表获得索引String nameString = cursor.getString(cursor.getColumnIndex(NAME));String numString = cursor.getString(cursor.getColumnIndex(NUM));String msgString = cursor.getString(cursor.getColumnIndex(MSG));// 保存数据Userinfo iUserinfo = new Userinfo();iUserinfo.setMsgString(msgString);iUserinfo.setNameString(nameString);iUserinfo.setNum(numString);infList.add(iUserinfo);}db.close();return infList;}}

最后是 MainActivity对应的Java文件

package com.example.contacttest;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import android.R.integer;import android.app.Activity;import android.app.AlertDialog;import android.app.Dialog;import android.content.DialogInterface;import android.graphics.Color;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.view.View.OnLongClickListener;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.AdapterView.OnItemLongClickListener;import android.widget.BaseAdapter;import android.widget.Button;import android.widget.EditText;import android.widget.GridView;import android.widget.ImageView;import android.widget.ListView;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends Activity {private ListView gview;private Button add_btn;private List<Userinfo> dataList;private Myadpter aMyadpter = new Myadpter();private ContactManage cManage;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);gview = (ListView) findViewById(R.id.gview);gview.setBackgroundResource(R.drawable.bgg);cManage = new ContactManage(getApplicationContext());// 获得 数据源listdataList = cManage.getAll();add_btn = (Button) findViewById(R.id.add_btn);add_btn.setOnClickListener(mListener);gview.setAdapter(aMyadpter);/** * 长按事件 */gview.setOnItemLongClickListener(new OnItemLongClickListener() {@Overridepublic boolean onItemLongClick(AdapterView<?> parent, View view,int position, long id) {final int a = position;AlertDialog.Builder edit1 = new AlertDialog.Builder(MainActivity.this);edit1.setTitle("编辑联系人");edit1.setItems(new String[] { "删除", "编辑" },new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog,int which) {switch (which) {case 0:AlertDialog.Builder edit3 = new AlertDialog.Builder(MainActivity.this);edit3.setTitle("删除联系人");edit3.setMessage("确定呀删除么?");edit3.setPositiveButton("删除",new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog,int which) {cManage.delete(dataList.get(a));// 此处需要更新适配器dataList = cManage.getAll();aMyadpter.notifyDataSetChanged();}});edit3.setNeutralButton("取消", null);edit3.create().show();break;case 1:AlertDialog.Builder addcontact = new AlertDialog.Builder(MainActivity.this);addcontact.setTitle("编辑联系人");View rooyview = getLayoutInflater().inflate(R.layout.addcontacter,null);final EditText contact_name = (EditText) rooyview.findViewById(R.id.contact_name);final EditText contact_num = (EditText) rooyview.findViewById(R.id.contact_num);final EditText contact_msg = (EditText) rooyview.findViewById(R.id.contact_msg);final Button contact_save = (Button) rooyview.findViewById(R.id.contact_save);contact_save.setVisibility(View.GONE);contact_name.setText(dataList.get(a).getNameString());contact_num.setText(dataList.get(a).getNum());contact_msg.setText(dataList.get(a).getMsgString());addcontact.setView(rooyview);addcontact.setPositiveButton("确定",new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog,int which) {String name = contact_name.getText().toString().trim();String num = contact_num<span style="font-family: Arial, Helvetica, sans-serif;">.</span>.getText().toString().trim();String msg = contact_msg.getText().toString().trim();Userinfo user = new Userinfo();user.setMsgString(msg);user.setNameString(name);user.setNum(num);                                                                                        cManage.update(user);// 此处需要更新适配器dataList = cManage.getAll();aMyadpter.notifyDataSetChanged();}});addcontact.setNegativeButton("取消", null);addcontact.create().show();break;default:break;}}});edit1.create().show();return true;}});/** * 点击事件 */gview.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> parent, View view,int position, long id) {AlertDialog.Builder edit2 = new AlertDialog.Builder(MainActivity.this);edit2.setMessage(dataList.get(position).getNum());edit2.create().show();}});}class Myadpter extends BaseAdapter {@Overridepublic int getCount() {// TODO Auto-generated method stubreturn dataList.size();}@Overridepublic Object getItem(int position) {// TODO Auto-generated method stubreturn position;}@Overridepublic long getItemId(int position) {// TODO Auto-generated method stubreturn position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {Haderset hset;if (!dataList.isEmpty()) {gview.setBackgroundColor(Color.WHITE);if (convertView == null) {convertView = getLayoutInflater().inflate(R.layout.gview,null);hset = new Haderset();hset.itemimg = (ImageView) convertView.findViewById(R.id.gview_img);hset.itemname = (TextView) convertView.findViewById(R.id.gview_name);hset.itemnum = (TextView) convertView.findViewById(R.id.gview_num);hset.itemmsg = (TextView) convertView.findViewById(R.id.gview_msg);convertView.setTag(hset);} else {hset = (Haderset) convertView.getTag();}hset.itemimg.setImageResource(R.drawable.ic_launcher);hset.itemname.setText(dataList.get(position).getNameString());hset.itemnum.setText(dataList.get(position).getNum());hset.itemmsg.setText(dataList.get(position).getMsgString());return convertView;//} else {return null;}}class Haderset {ImageView itemimg;TextView itemname;TextView itemnum;TextView itemmsg;}}/** * //添加 联系人 */private OnClickListener mListener = new OnClickListener() {@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.add_btn:final AlertDialog.Builder addcontact = new AlertDialog.Builder(MainActivity.this);addcontact.setTitle("添加联系人");View rooyview = getLayoutInflater().inflate(R.layout.addcontacter, null);final EditText contact_name = (EditText) rooyview.findViewById(R.id.contact_name);final EditText contact_num = (EditText) rooyview.findViewById(R.id.contact_num);final EditText contact_msg = (EditText) rooyview.findViewById(R.id.contact_msg);Button contact_save = (Button) rooyview.findViewById(R.id.contact_save);addcontact.setView(rooyview);final AlertDialog dialog = addcontact.create();dialog.show();contact_save.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {String name = contact_name.getText().toString().trim();String num = contact_num.getText().toString().trim();String msg = contact_msg.getText().toString().trim();Userinfo iUserinfo = new Userinfo();iUserinfo.setMsgString(msg);iUserinfo.setNameString(name);iUserinfo.setNum(num);if (cManage.insert(iUserinfo)) {Toast.makeText(getApplicationContext(), "保存成功",Toast.LENGTH_SHORT).show();AlertDialog.Builder dia = new AlertDialog.Builder(MainActivity.this);dia.setTitle("是否继续添加");dia.setMessage("已成功保存，是否继续？");dia.setPositiveButton("是",new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog,int which) {contact_name.setText("");contact_num.setText("");contact_msg.setText("");contact_name.requestFocus();// 获取焦点// 此处需要更新适配器 重新取值dataList = cManage.getAll();aMyadpter.notifyDataSetChanged();}});dia.setNegativeButton("否",new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface _dialog,int which) {// 更新变量尽量不要 和系统的一致// 造成默认为dialog，修改为_dialog// 默认参数替代了定义的 变量dataList = cManage.getAll();aMyadpter.notifyDataSetChanged();dialog.dismiss();}});dia.create().show();} elseToast.makeText(getApplicationContext(), "失败鸟！",Toast.LENGTH_SHORT).show();}});break;default:break;}}};@Overridepublic 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;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {// Handle action bar item clicks here. The action bar will// automatically handle clicks on the Home/Up button, so long// as you specify a parent activity in AndroidManifest.xml.int id = item.getItemId();if (id == R.id.action_settings) {return true;}return super.onOptionsItemSelected(item);}}