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  • 实验八：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年5月6日

    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

    4

    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。单击图标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）  新建工程，修改布局文件，定义字符串资源。

    （3）  开发布局文件activity_main.xml用于显示联系人列表。

    （4）  layout目录下新建一个detail.xml,用于显示联系人详细信息。

    （5）  开发数据库辅助类MyOpenHelper类

    （6）  DetailActivity端开发实现数据库增加、删除、修改记录等操作

    （7）  新建Activity名为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：

    DeleteActivity

    public class DeleteActivity extends Activity {
    Button btnback;
    Intent it = new Intent();
    ListView listview;
    UserSQL usersql;
    SQLiteDatabase userdatabases;
    ArrayList<HashMap<String, Object>> userlist;
    String[] name = new String[100];
    Cursor cursor;
    SimpleAdapter sa;
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.delete);
        btnback = (Button) findViewById(R.id.back);
        listview = (ListView) findViewById(R.id.listView2);
        usersql = new UserSQL(DeleteActivity.this, "user.db", null, 1);
        userdatabases = usersql.getReadableDatabase();
        userlist = new ArrayList<HashMap<String, Object>>();
        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();
                }
            }
            sa = new SimpleAdapter(DeleteActivity.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
                
                userdatabases.delete("userTable", "name=?",new String[] { name[position] });
                
                list();
            }
        });
        btnback.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                it.setClass(DeleteActivity.this, MainActivity.class);
                startActivity(it);
                finish();
            }
        });

    }
    public void list(){
        userlist = new ArrayList<HashMap<String, Object>>();
        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();
                }
            }
            sa = new SimpleAdapter(DeleteActivity.this, userlist,
                    R.layout.list, new String[] { "name", "phone" }, new int[] {
                            R.id.namelist, R.id.phonelist });
            listview.setAdapter(sa);
        }
    }
}

    DetailActivity

    package com.example.tongxinlu;
public class DetailActivity extends Activity {
    EditText edname, edphone, edmobile, edemail, edpost, edaddr, edcomp;
    String name, phone, mobile, email, post, addr, comp;
    Button btnadd;
    UserSQL 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 UserSQL(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 it = new Intent();
                        it.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();
                }
            }

        });
    }
}

    main

    package com.example.tongxinlu;public class MainActivity extends Activity {
    Button btnadd, btndel;
    Intent it = new Intent();
    ListView listview;
    UserSQL 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 UserSQL(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
                it.setClass(MainActivity.this, DetailActivity.class);
                Bundle bd=new Bundle();
                bd.putString("name", "");   
                it.putExtras(bd);
                startActivity(it);

            }
        });
        btndel.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                it.setClass(MainActivity.this, DeleteActivity.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;
    }

}

    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）

        经过本次的实验，对数据库进行增、删、查、改的操作有了一定的了解，通过参考资料和老师上课讲解梳理了部分知识难点，完成的挺顺利。日后需要多看，多练编写android程序。

    实验评语

     

    实验成绩

     

    指导教师签名：              年   月   日
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  • 原文地址：https://www.cnblogs.com/cckuang/p/5487346.html
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