ListView显示数据库的数据-SimpleCursorAdapter的使用

1.新建dbhytcs项目



2.HytcSQLiteOpenHelper.java

package com.example.dbhytcs.db;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;

public class HytcSQLiteOpenHelper extends SQLiteOpenHelper{

private static String name = "hytc.db";
private static Integer version = 2;

public HytcSQLiteOpenHelper(Context context) {
super(context, name, null, version);
// TODO Auto-generated constructor stub
}

@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE user(id integer primary key autoincrement,name varchar(20))");
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL("alter table user add column phone varchar(11)");
}

}

3.DBTest.java

package com.example.dbhytcs.test;

import com.example.dbhytcs.db.HytcSQLiteOpenHelper;

import android.database.sqlite.SQLiteDatabase;
import android.test.AndroidTestCase;

public class DBTest extends AndroidTestCase{

private HytcSQLiteOpenHelper helper;

public void testInsert(){
helper = new HytcSQLiteOpenHelper(getContext());
SQLiteDatabase db = helper.getWritableDatabase();
for (int i = 0; i < 20; i++) {
//执行sql语句
db.execSQL("insert into user(name,phone) values('chj"+i+"','15962203803')");
}
db.close();
}
}

4.在activity_main.xml中定义ListView控件id=lv_users
5.MainActivity.java

package com.example.dbhytcs;

import android.app.Activity;
import android.database.Cursor;
import android.os.Bundle;
import android.support.v4.widget.CursorAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;

import com.example.dbhytcs.db.HytcSQLiteOpenHelper;

public class MainActivity extends Activity {

// 声明控件
private ListView lv_users;

private HytcSQLiteOpenHelper helper;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 获取控件对象
lv_users = (ListView) findViewById(R.id.lv_users);

helper = new HytcSQLiteOpenHelper(this);

Cursor c = helper.getReadableDatabase().rawQuery(
"select id as _id,name,phone from user", null);

// 创建adapter适配器对象
ListAdapter adapter = new SimpleCursorAdapter(this,
android.R.layout.simple_expandable_list_item_2, c,
new String[] { "name", "phone" }, new int[] {
android.R.id.text1, android.R.id.text2 },CursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);
//设置适配器
lv_users.setAdapter(adapter);
}
}

6.演示效果



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