«

使用SQLite数据库保存和处理数据

时间：2024-3-2 18:12     作者：韩俊     分类： Android

项目目的：

1. 使用SQLite数据库保存数据

2. 使用SQLite数据库的数据进行增删查改等操作。

3.学会使用SQLiteOpenHelper和SQLiteDatabase。


项目内容：

下面4图分别为主界面(1)，按添加进行添加操作(2)，点击listView的item进行修改操作(3)，长按item进行删除操作(4)


项目结构为：


下面是代码：

Member.java

package android.ex08;

public class Member {
    private long ID=-1;
    private String name;
    private String phone;
    @Override
    public String toString(){
        String result="";
        result+="ID: "+this.ID+", ";
        result+="姓名: "+this.name+", ";
        result+="号码: "+this.phone;
        return result;
    }
    public long getID(){
        return ID;
    }
    public String getName(){
        return name;
    }
    public String getPhone(){
        return phone;
    }
    public void setID(long newID){
        ID=newID;
    }
    public void setName(String newName){
        name=newName;
    }
    public void setPhone(String newPhone){
        phone=newPhone;
    }
}

MemberDAO.java 
package android.ex08;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;

public class MemberDAO extends SQLiteOpenHelper {
    private static final String DB_NAME="member.db";
    private static final int DB_VERSION=1;
    private static final String TABLE_NAME="member";  
    private static final String SQL_CREATE_TABLE="create table "+TABLE_NAME
            +"(_id integer primary key autoincrement,"
            +" name text not null , info text);"; 
    public MemberDAO(Context context){
        super(context, DB_NAME, null, DB_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(SQL_CREATE_TABLE);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        //db.execSQL("DROP TABLE IF EXISTS "+TABLE_NAME);
        //onCreate(db);
    }

    public long insert(Member entity){
        SQLiteDatabase db=getWritableDatabase();
        ContentValues values=new ContentValues();
        values.put("name",entity.getName());
        values.put("info",entity.getPhone());
        long rid=db.insert(TABLE_NAME, null, values);
        db.close();
        return rid;
    }
    public long update(Member entity){
        SQLiteDatabase db=getWritableDatabase();
        String whereClause="_id=?";
        String[] whereArgs={String.valueOf(entity.getID())};
        ContentValues values=new ContentValues();
        values.put("name",entity.getName());
        values.put("info",entity.getPhone());
        long rows=db.update(TABLE_NAME, values, whereClause, whereArgs);
        db.close();
        return rows;
    }
    public long delete(long ID){
        SQLiteDatabase db=getWritableDatabase();
        long rows=db.delete(TABLE_NAME, "_id=?", new String[]{String.valueOf(ID)});
        db.close();
        return rows;
    }
    public long deleteAll(){
        SQLiteDatabase db=getWritableDatabase();
        long rows=db.delete(TABLE_NAME, null, null);
        db.close();
        return rows;
    }
    public Member[] getAllData(){
        SQLiteDatabase db=getReadableDatabase();
        Cursor result=db.query(TABLE_NAME, null, null, null, null, null, null);
        return ConvertToMember(result);
    }

    private Member[] ConvertToMember(Cursor cursor){
        int resultCounts=cursor.getCount();
        if(resultCounts==0||!cursor.moveToFirst()){
            return null;
        }
        Member[] members=new Member[resultCounts];
        for(int i=0;i<resultCounts;i++){
            members[i]=new Member();
            members[i].setID(cursor.getInt(0));
            members[i].setName(cursor.getString(cursor.getColumnIndex("name")));
            members[i].setPhone(cursor.getString(cursor.getColumnIndex("info")));
            cursor.moveToNext();
        }
        return members;
    }
}

MainActivity.java

package android.ex08;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnCreateContextMenuListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Button;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;

public class MainActivity extends Activity {
    public MemberDAO memberDAO=new MemberDAO(this);
    public Member[] members;
    private Button insert;
    private ListView listView;
    private List<Map<String, String>> arrayList=new ArrayList<Map<String, String>>();
    private SimpleAdapter simpleAdapter;
    private void setData(){
        members=memberDAO.getAllData();
        Map<String, String> map;
        if(members==null){ 
            return;
        }
        int count=members.length;
        if(count!=0){
            for(int i=0;i<count;i++){
                map=new HashMap<String, String>();
                map.put("name", members[i].getName());
                map.put("info", members[i].getPhone());
                arrayList.add(map);
            }
        }
    } 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        insert=(Button)findViewById(R.id.button1);
        listView=(ListView)findViewById(R.id.listView1);
        setData();
        simpleAdapter=new SimpleAdapter(this, 
                arrayList, R.layout.list_item, new String[]{"name","info"},
                new int[]{R.id.listName,R.id.listInfo});
        listView.setAdapter(simpleAdapter);  
        insert.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent intent=new Intent(MainActivity.this,SecondActivity.class);
                startActivity(intent);
                MainActivity.this.finish();         
            }
        });
        listView.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                Intent intent=new Intent(MainActivity.this, ThirdActivity.class);
                Bundle bundle=new Bundle();
                bundle.putLong("ID", id);
                intent.putExtras(bundle);
                startActivity(intent);
                MainActivity.this.finish(); 
            }
        });
        ItemOnLongClick();       
    }
    public void ItemOnLongClick() {
        //注：setOnCreateContextMenuListener是与下面onContextItemSelected配套使用的
        listView.setOnCreateContextMenuListener(new OnCreateContextMenuListener() {
            @Override
            public void onCreateContextMenu(ContextMenu menu, View v,ContextMenuInfo menuInfo) {
                    menu.add(0, 0, 0, "删除");//设置弹出菜单的条目
            }
            });
        }
    public boolean onContextItemSelected(MenuItem item) {
        AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo();
        int MID = (int) info.id;            //MID为listView中的数据序号，从0开始
        switch (item.getItemId()) {
        case 0:
            // 删除操作 ,修改数据库
            members=memberDAO.getAllData();
            long _id=members[MID].getID();
            memberDAO.delete(_id);
            arrayList.remove(MID);         //从链表中把该item移除
            simpleAdapter.notifyDataSetChanged();  //更新适配器              
            Toast.makeText(MainActivity.this, "删除成功", Toast.LENGTH_SHORT).show();
            break;
        default:
            break;
        }
        return super.onContextItemSelected(item);
    }

    @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;
    }

    @Override
    public 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);
    }
}

SecondActivity.java

package android.ex08;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.view.View.OnClickListener;
//处理insert操作
public class SecondActivity extends Activity {

    public MemberDAO memberDAO=new MemberDAO(this);
    private EditText textName,textPhone;
    private Button confirm,cancel;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.insert_mem);
        textName=(EditText)findViewById(R.id.insert_editText1);
        textPhone=(EditText)findViewById(R.id.insert_editText2);
        confirm=(Button)findViewById(R.id.insert_button1);
        cancel=(Button)findViewById(R.id.insert_button2);
        confirm.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                Member member=new Member();
                member.setName(textName.getText().toString());
                member.setPhone(textPhone.getText().toString());
                memberDAO.insert(member);
                Intent intent=new Intent(SecondActivity.this,MainActivity.class);
                startActivity(intent);
                SecondActivity.this.finish();   
            }
        });
        cancel.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent intent=new Intent(SecondActivity.this,MainActivity.class);
                startActivity(intent);
                SecondActivity.this.finish();   
            }
        });

    }

}

ThirdActivity.java 
package android.ex08;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
//处理update操作
public class ThirdActivity extends Activity {
    public MemberDAO memberDAO=new MemberDAO(this);
    private EditText textName,textPhone;
    private Button confirm,cancel;
    private long bundle_ID;
    Member[] members=null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.update_mem);
        textName=(EditText)findViewById(R.id.update_editText1);
        textPhone=(EditText)findViewById(R.id.update_editText2);
        confirm=(Button)findViewById(R.id.update_button1);
        cancel=(Button)findViewById(R.id.update_button2);
        Bundle bundle=ThirdActivity.this.getIntent().getExtras();       
        bundle_ID=bundle.getLong("ID");
        members=memberDAO.getAllData();
        textName.setText(members[(int)bundle_ID].getName());
        textPhone.setText(members[(int)bundle_ID].getPhone());
        confirm.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {   
                members[(int)bundle_ID].setName(textName.getText().toString());
                members[(int)bundle_ID].setPhone(textPhone.getText().toString());
                memberDAO.update(members[(int)bundle_ID]);
                Intent intent=new Intent(ThirdActivity.this,MainActivity.class);
                startActivity(intent);
                ThirdActivity.this.finish();

            }
        });
        cancel.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent intent=new Intent(ThirdActivity.this,MainActivity.class);
                startActivity(intent);
                ThirdActivity.this.finish();    
            }
        });

    }

}

activity_main.xml 
<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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="android.ex08.MainActivity" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="@string/memberList"
        android:textSize="22sp" />

    <Button
        android:id="@+id/button1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/insert" />

    <ListView
        android:id="@+id/listView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
    </ListView>

</LinearLayout>

insert_mem.xml 
<?xml version="1.0" encoding="utf-8"?>
<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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin" >

    <TextView
        android:id="@+id/insert_textView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="@string/insertMember"
        android:textSize="22sp" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <TextView
            android:id="@+id/insert_textView2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="18sp"
            android:text="@string/name" />

        <EditText
            android:id="@+id/insert_editText1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:ems="10"
            android:hint="@string/enterName">

            <requestFocus />
        </EditText>

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <TextView
            android:id="@+id/insert_textView3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="18sp"
            android:text="@string/phone"/>

        <EditText
            android:id="@+id/insert_editText2"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:ems="10"
            android:hint="@string/enterPhone"
            android:inputType="phone" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingLeft="50dp" >

        <Button
            android:id="@+id/insert_button1"
            android:layout_width="80dp"
            android:layout_height="wrap_content"
            android:text="@string/confirm"/>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="right"
            android:layout_marginRight="50dp">

            <Button
                android:id="@+id/insert_button2"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="@string/cancel" />

        </LinearLayout>

    </LinearLayout>

</LinearLayout>

update_mem.xml

<?xml version="1.0" encoding="utf-8"?>
<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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin" >

    <TextView
        android:id="@+id/update_textView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="@string/updateMember"
        android:textSize="22sp" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <TextView
            android:id="@+id/update_textView2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="18sp"
            android:text="@string/name" />

        <EditText
            android:id="@+id/update_editText1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:ems="10"
            android:hint="@string/enterName">

            <requestFocus />
        </EditText>

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <TextView
            android:id="@+id/update_textView3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="18sp"
            android:text="@string/phone"/>

        <EditText
            android:id="@+id/update_editText2"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:ems="10"
            android:hint="@string/enterPhone"
            android:inputType="phone" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingLeft="50dp" >

        <Button
            android:id="@+id/update_button1"
            android:layout_width="80dp"
            android:layout_height="wrap_content"
            android:text="@string/confirm"/>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="right"
            android:layout_marginRight="50dp">

            <Button
                android:id="@+id/update_button2"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="@string/cancel" />

        </LinearLayout>

    </LinearLayout>

</LinearLayout>

list_item.xml
<?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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin" >

    <TextView
        android:id="@+id/listName"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/name"
        android:textSize="22sp"/>

    <TextView
        android:id="@+id/listInfo"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" 
        android:text="@string/phone"/>

</LinearLayout>

strings.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">EX08</string>    
    <string name="app_name1">SecondActivity</string>  
    <string name="app_name2">ThirdActivity</string>    
    <string name="action_settings">Settings</string>
    <string name="insert">添加</string>
    <string name="memberList">成员列表</string>
    <string name="insertMember">添加新成员</string>
    <string name="updateMember">修改成员</string>
    <string name="name">姓名:</string>
    <string name="phone">号码:</string>
    <string name="confirm">确定</string>
    <string name="cancel">取消</string>
    <string name="enterName">请输入姓名</string>
    <string name="enterPhone">请输入号码</string>

</resources>

AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="android.ex08"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="15"
        android:targetSdkVersion="19" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".SecondActivity"
             android:label="@string/app_name1">

        </activity>
        <activity android:name=".ThirdActivity"
            android:label="@string/app_name2">

        </activity>
    </application>

</manifest>


标签: android

热门推荐

1 Android 自定义侧滑菜单
2 android 压缩图片尺寸
3 Android客户端通过socket与服务器通信
4 android自定义控件之模仿优酷菜单
5 Android监听的四种方式
6 Android之EventBus概述及源码解析(雷惊风)
7 路径下获取文件(类似安卓指定路径文件获取)
8 Android学习 - 自定义输入法
9 深入理解Android
10 性能优化之Java(Android)代码优化

日历

标签

hbase maven eclipse sybase PostgreSQL spring emcache oracle mongodb redis nginx golang java vue android ios mysql linux 微信小程序 css html php教程 javascript python php

搜索

最新文章

热门文章