实验8 SQLite数据库操作

实验报告

课程名称		基于Android平台移动互联网开发		实验日期	2016.04.29
实验项目名称		SQLite数据库操作		实验地点	S3010
实验类型		□验证型    √设计型    □综合型		学  时	6
一、           实验目的及要求（本实验所涉及并要求掌握的知识点）
1、设计一个个人通讯录，掌握Android平台下的数据库开发，该个人通讯录主要包括联系人列表和联系人详细信息等界面。 2、程序主界面是通讯录的目录显示手机上联系人的名称。点击联系人的姓名可以显示联系人的详细信息。在按了MEMU键之后会弹出菜单栏。 单击菜单栏上的按钮可以添加联系人和删除联系人
二、实验环境（本实验所使用的硬件设备和相关软件）
(1)PC机 (2)操作系统：Windows XP (3)软件： Eclipse, JDK1.6，Android SDK，ADT
三、实验内容及步骤
1) 确定数据库的数据结构 2) 在res/drawable-mdpi目录下拷入程序要用的图标 3) 定义字符串资源string.xml 4) 开发布局文件activity_main.xml用于显示联系人列表 5) layout目录下新建一个detail.xml,用于显示联系人详细信息 6) 开发数据库辅助类MyOpenHelper类，新建一个MyOpenHelper.java 7) 接下来便进入MainActivity端的开发，实现数据库增加、删除、修改记录等操作 8) 新建一个Activity名字叫DetailActivity.java，实现联系人详细信息显示功能
四、实验结果（本实验源程序清单及运行结果或实验结论、实验设计图）
代码： MainActivity: public class MainActivity extends Activity {    Button btnadd, btndel;    Intent intent = new Intent();    ListView listview;    MyOpenHelper usersql;    SQLiteDatabase userdatabases;    ArrayList<HashMap<String, Object>> userlist;    String[] name=new String[100];    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        btnadd = (Button) findViewById(R.id.add);        btndel = (Button) findViewById(R.id.delete);        listview = (ListView) findViewById(R.id.listView1);        usersql = new MyOpenHelper(MainActivity.this, "user.db", null, 1);        userdatabases = usersql.getReadableDatabase();        userlist = new ArrayList<HashMap<String, Object>>();        Cursor cursor = userdatabases.rawQuery("select * from userTable", null);        cursor.moveToFirst();        if (cursor.getCount() > 0) {           for (int i = 0; i < cursor.getCount(); i++) {               HashMap<String, Object> hashmap = new HashMap<String, Object>();               hashmap.put("name",                      cursor.getString(cursor.getColumnIndex("name")));               name[i]=cursor.getString(cursor.getColumnIndex("name"));               hashmap.put("phone",                      "["+cursor.getString(cursor.getColumnIndex("phone"))+"]");               userlist.add(hashmap);               if (i < cursor.getCount()) {                  cursor.moveToNext();               }           }           SimpleAdapter sa = new SimpleAdapter(MainActivity.this, userlist,                  R.layout.list, new String[] { "name", "phone" }, new int[] {                      R.id.namelist, R.id.phonelist                  });           listview.setAdapter(sa);        }        listview.setOnItemClickListener(new OnItemClickListener() {           @Override           public void onItemClick(AdapterView<?> parent, View view,                  int position, long id) {               // TODO Auto-generated method stub               Intent intent=new Intent(MainActivity.this,DetailActivity.class);               Bundle bd=new Bundle();               bd.putString("name", name[position]);                         intent.putExtras(bd);               startActivity(intent);           }        });        btnadd.setOnClickListener(new OnClickListener() {           @Override           public void onClick(View v) {               // TODO Auto-generated method stub               intent.setClass(MainActivity.this, DetailActivity.class);               Bundle bd=new Bundle();               bd.putString("name", "");                             intent.putExtras(bd);               startActivity(intent);           }        });        btndel.setOnClickListener(new OnClickListener() {                     @Override           public void onClick(View v) {               // TODO Auto-generated method stub               intent.setClass(MainActivity.this, DeleteActivicy.class);               startActivity(it);           }        });    }    @Override    public 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;    } } DetailActivity: public class DetailActivity extends Activity {    EditText edname, edphone, edmobile, edemail, edpost, edaddr, edcomp;    String name, phone, mobile, email, post, addr, comp;    Button btnadd;    MyOpenHelper usersql;    SQLiteDatabase userdatabase;    Bundle bd;    String selectname;    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.detail);        btnadd = (Button) findViewById(R.id.deadd);        edname = (EditText) findViewById(R.id.edname);        edphone = (EditText) findViewById(R.id.edphone);        edmobile = (EditText) findViewById(R.id.edmoblie);        edemail = (EditText) findViewById(R.id.edemail);        edpost = (EditText) findViewById(R.id.edpost);        edaddr = (EditText) findViewById(R.id.edaddr);        edcomp = (EditText) findViewById(R.id.edcomp);        usersql = new MyOpenHelper(DetailActivity.this, "user.db", null, 1);        userdatabase = usersql.getReadableDatabase();        bd = getIntent().getExtras();        if (!bd.getString("name").equals("")) {           selectname = bd.getString("name");           Cursor cursor = userdatabase.rawQuery(                  "select * from userTable where name=?",                  new String[] { selectname });           cursor.moveToFirst();           edname.setText(cursor.getString(cursor.getColumnIndex("name")));           edphone.setText(cursor.getString(cursor.getColumnIndex("phone")));           edmobile.setText(cursor.getString(cursor.getColumnIndex("mobile")));           edemail.setText(cursor.getString(cursor.getColumnIndex("email")));           edpost.setText(cursor.getString(cursor.getColumnIndex("post")));           edaddr.setText(cursor.getString(cursor.getColumnIndex("addr")));           edcomp.setText(cursor.getString(cursor.getColumnIndex("comp")));           btnadd.setText("更新");        }        btnadd.setOnClickListener(new OnClickListener() {           @Override           public void onClick(View v) {               // TODO Auto-generated method stub               name = edname.getText().toString();               phone = edphone.getText().toString();               mobile = edmobile.getText().toString();               email = edemail.getText().toString();               post = edpost.getText().toString();               addr = edaddr.getText().toString();               comp = edcomp.getText().toString();               if (!name.equals("") && !phone.equals("") && !mobile.equals("")                      && !email.equals("") && !post.equals("")                      && !addr.equals("") && !comp.equals("")) {                  Cursor cursor = userdatabase.rawQuery(                         "select * from userTable where name=?",                         new String[] { name });                  cursor.moveToFirst();                  ContentValues cv = new ContentValues();                  cv.put("name", name);                  cv.put("phone", phone);                  cv.put("mobile", mobile);                  cv.put("email", email);                  cv.put("post", post);                  cv.put("addr", addr);                  cv.put("comp", comp);                  if (cursor.getCount() <= 0) {                      userdatabase.insert("userTable", null, cv);                      cv.clear();                      Toast.makeText(DetailActivity.this, "保存" + name + "成功",                             Toast.LENGTH_LONG).show();                      userdatabase.delete("userTable", "name=?",                             new String[] { selectname });                      Intent intent= new Intent();                      intent.setClass(DetailActivity.this, MainActivity.class);                      startActivity(it);                      finish();                  } else if (cursor.getCount() == 1                         && cursor.getString(cursor.getColumnIndex("name"))                                .equals(selectname)) {                      userdatabase.update("userTable", cv, "name=?",                             new String[] { selectname });                      cv.clear();                      Toast.makeText(DetailActivity.this, "更新" + name + "成功",                             Toast.LENGTH_LONG).show();                      Intent it = new Intent();                      it.setClass(DetailActivity.this, MainActivity.class);                      startActivity(it);                      finish();                  } else {                      Toast.makeText(DetailActivity.this, name + "已注册",                             Toast.LENGTH_LONG).show();                  }               } else {                  Toast.makeText(DetailActivity.this, "信息不完整",                         Toast.LENGTH_LONG).show();               }           }        });    } } MyOpenHelper: package com.example.contact; import android.content.Context; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteDatabase.CursorFactory; import android.database.sqlite.SQLiteOpenHelper; public class MyOpenHelper extends SQLiteOpenHelper{    public static final String CREAT_USER="create table userTable(id integer primary key autoincrement,name,phone,mobile,email,post,addr,comp)";    public MyOpenHelper(Context context, String name, CursorFactory factory,           int version) {        super(context, name, factory, version);        // TODO Auto-generated constructor stub    }    @Override    public void onCreate(SQLiteDatabase db) {        // TODO Auto-generated method stub        db.execSQL(CREAT_USER);    }    @Override    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {        // TODO Auto-generated method stub           } } string.xml: <?xml version="1.0" encoding="utf-8"?> <resources>     <string name="app_name">contact</string>     <string name="action_settings">Settings</string>     <string name="title">联系人列表</string>     <string name="tvname">姓名：  </string>     <string name="tvphone">固定电话：</string>     <string name="tvmoblie">移动电话：</string>     <string name="tvemail">电子邮件：</string>     <string name="tvpost">邮政编码：</string>     <string name="tvaddr">通信地址：</string>     <string name="tvcomp">公司名称：</string>     <string name="add">添加</string>     <string name="delete">删除</string>     <string name="back">返回</string> </resources>   运行结果：（截图）
五、实验总结（对本实验结果进行分析，实验心得体会及改进意见）
这次实验真的真的很难很难。数据库的操作是比想象中的难很多的，这一次所有并不是我自己的，很多我也还没有研究出来，例如，列表中的字体如何设置，如何在背景黑色显示出来等等，遇到的问题很多并不是语法的错误，而是虚拟机各种小小问题，在此上面我已经奔溃好几次，程序员不是敲代码仅仅的苦，还有死机没有保存，或者保存不成功的痛。奔溃几次我想我就应该可以习惯了。
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