Android利用listview控件操作SQLite数据库实例

package com.example.listview_sqlite_xu;

import android.content.Context;

import android.database.sqlite.SQLiteDatabase;

import android.database.sqlite.SQLiteDatabase.CursorFactory;

import android.database.sqlite.SQLiteOpenHelper;

public class NewsSearchDatabaseHelper extends SQLiteOpenHelper {

final String SQL_CREATE_TABLE = "create table news_table (" +

"_id integer primary key autoincrement, " +

"news_tittle varchar(50), " +

"news_content varchar(5000))";
public NewsSearchDatabaseHelper(Context context, String name, int version) {
    super(context, name, null, version);
  }

  @Override
  public void onCreate(SQLiteDatabase db) {
    db.execSQL(SQL_CREATE_TABLE);
  }
  @Override
  public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    System.out.println("call update");
  }   
}

package com.example.listview_sqlite_xu;

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

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.database.SQLException;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.View;
import android.view.View.OnCreateContextMenuListener;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
import android.widget.Toast;

public class MainActivity extends Activity {

  private NewsSearchDatabaseHelper helper;  //数据库帮助类
  private EditText et_tittle;          //输入新闻标题
  private EditText et_content;        //输入新闻内容
  private ListView listView;                  //显示新闻列表
  ArrayList> listData; //  key-value

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    helper = new NewsSearchDatabaseHelper(getApplicationContext(), "news", 1);       //创建一个名为“news”的数据库

    //初始化控件
    et_tittle = (EditText) findViewById(R.id.et_news_tittle);
    et_cOntent= (EditText) findViewById(R.id.et_news_content);
    listView = (ListView) findViewById(R.id.lv_news);
    listView.setOnCreateContextMenuListener(listviewLongPress); 
      // 设置长按事件 


  }

  /*
   * 按钮点击事件
   * 通过判断被点击的组件, 执行不同的操作
   */
  public void onClick(View view) {
    int id = view.getId();
    if(id==R.id.bt_add) 
     insertNews();

    else if(id== R.id.bt_query)
        queryNews();

    }

  /*
   * 刷新数据库列表显示
   * 1. 关联SimpleCursorAdapter与数据库表, 获取数据库表中的最新数据
   * 2. 将最新的SimpleCursorAdapter设置给ListView
   */
  private void inflateListView(Cursor cursor) {
  SimpleCursorAdapter cursorAdapter = new SimpleCursorAdapter(getApplicationContext(), R.layout.item, cursor, new String[]{"news_tittle", "news_content"}, new int[]{R.id.tittle, R.id.content},1);

    listView.setAdapter(cursorAdapter);
  }

  /*
   * 插入新闻数据
   * 1. 从EditText组件中获取新闻的标题 和 新闻内容
   * 2. 获取数据库并从将 新闻标题 和 内容 插入到数据库中
   * 3. 重新查询数据库 获得Cursor对象
   * 4. 根据cursor对象创建SimpleCursorAdapter对象
   * 5. 将SimpleCursorAdapter设置给ListView, 显示新闻列表
   */
  private void insertNews() {
    String tittle = et_tittle.getText().toString();
    String cOntent= et_content.getText().toString();

    helper.getReadableDatabase().execSQL("insert into news_table values(null, &＃63;, &＃63;)", new String[]{tittle, content});

    Cursor cursor = helper.getReadableDatabase().rawQuery("select * from news_table", null);
    inflateListView(cursor);      //刷新listview
  }

  /*
   * 删除新闻数据
   * 根据_id删除指定数据，并进行刷新
   */
  private boolean deleteNews(int _id) {
     String whereClause = "_id=&＃63;"; 
     String[] whereArgs = new String[] { String.valueOf(_id) }; 
     try{
     helper.getReadableDatabase().delete("news_table", whereClause,whereArgs);
     Cursor cursor = helper.getWritableDatabase().rawQuery("select * from news_table", null);
     inflateListView(cursor);
     }catch (SQLException e) { 
       Toast.makeText(getApplicationContext(), "删除数据库失败", 
           Toast.LENGTH_LONG).show(); 
       return false; 
     } 
     return true; 
   } 



  //长按listview删除item   
  OnCreateContextMenuListener listviewLOngPress= new OnCreateContextMenuListener() { 
     public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) { 
        final AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) menuInfo; 
        new AlertDialog.Builder(MainActivity.this) 
            // 弹出窗口的最上头文字  
            .setTitle("删除当前数据") 
             //设置弹出窗口的图式  
            .setIcon(android.R.drawable.ic_dialog_info) 
            // 设置弹出窗口的信息  
            .setMessage("确定删除当前记录") 
            .setPositiveButton("是", 
             new DialogInterface.OnClickListener() { 
             public void onClick( DialogInterface dialoginterface, int i) { 
                    // 获取位置索引 
            int mListPos = info.position; 
                    // 将listview中所有的数据都传入hashmap-listData中
            Cursor c = helper.getReadableDatabase().rawQuery("select * from news_table", null);
            int columnsSize = c.getColumnCount();
            listData = new ArrayList>();
             while (c.moveToNext()) { 
            HashMap map = new HashMap(); 
             for (int j = 0; j  map = listData .get(mListPos); 
              // 获取id 
              int id = Integer.valueOf((map.get("_id").toString())); 
             deleteNews(id); 
               // 移除数据   
             } 
             } 
           ) 
        .setNegativeButton("否", 
          new DialogInterface.OnClickListener() { 
           public void onClick( 
             DialogInterface dialoginterface, int i) { 
                    // 什么也没做 

                  } 
                }).show(); 
      } 
    };





  /*
   * 查询新闻
   * 1. 获取要查询的新闻标题 和 新闻内容
   * 2. 查询数据库 获取 Cursor, 并将Cursor转化为List>类型的集合
   * 3. 将集合放入bundle, Intent开启另一个Activity, 将bundle放入intent对象, 跳转Activity
   * 
   */
  private void queryNews() {
    String tittle = et_tittle.getText().toString();
    String cOntent= et_content.getText().toString();

    Cursor cursor = helper.getReadableDatabase().rawQuery(
        "select * from news_table where news_tittle like &＃63; and news_content like &＃63;", 
        new String[]{"%" + tittle + "%", "%" + content + "%"});

    Bundle bundle = new Bundle();
    bundle.putSerializable("news", cursor2list(cursor));
    Intent intent = new Intent(this, SearchResultActivity.class);
    intent.putExtras(bundle);
    startActivity(intent);  
  }

  /*
   * 返回一个ArrayList集合, 这个集合中每个元素是一个Map集合, 每个Map集合有两个元素
   * 解析Cursor对象 : 
   * 1. cursor光标向下移动一格; 
   * 2. 创建一个HashMap对象
   * 3. 使用 cursor.getString(列标号)获取该行中某列值, 将这个值放入map中
   * 4. 将Map对象放入
   */
  private ArrayList> cursor2list(Cursor cursor) {
    ArrayList> list = new ArrayList>();

    //遍历Cursor
    while(cursor.moveToNext()){
      Map map = new HashMap();
      map.put("tittle", cursor.getString(1));
      map.put("content", cursor.getString(2));
      list.add(map);
    }
    return list;
  }
  @Override
  protected void onDestroy() {
    super.onDestroy();
    //释放数据库资源
    if(helper !=null)
      helper.close();
  }
}

package com.example.listview_sqlite_xu;

import java.util.List;
import java.util.Map;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.ListView;
import android.widget.SimpleAdapter;

public class SearchResultActivity extends Activity {

  private ListView listView;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    //设置布局文件
    setContentView(R.layout.news_search_result);
    //初始化组件
    listView = (ListView) findViewById(R.id.lv_search_result);
    //获取跳转到该Activity的intent对象
    Intent intent = getIntent();
    //获取Intent对象所携带的数据
    Bundle bundle = intent.getExtras();
    //从Bundle中取出List>数据
    @SuppressWarnings("unchecked")
    List> list = (List>)bundle.getSerializable("news");

    SimpleAdapter adapter = new SimpleAdapter(
        getApplicationContext(),   //上下文对象
        list,             //数据源
        R.layout.item,         //List显示布局
        new String[]{"tittle", "content"}, //List中map的键值
        new int[]{R.id.tittle, R.id.content});  //填充到的布局文件

    listView.setAdapter(adapter);
  }

}

  

  

  

  

  
    

    
  

  


listview的布局文件：

<&＃63;xml version="1.0" encoding="utf-8"&＃63;>


  

  

<&＃63;xml version="1.0" encoding="utf-8"&＃63;>