开发过程中使用Android自带的数据库，不仅安全性较好，而且数据存取的效果也较好。
附源代码
http://download.csdn.net/detail/wyx100/8670843
完成数据的输入，触发保存
启动后界面
输入数据
数据库读取数据后显示
类代码
package com.example.sqlitetest;
import android.os.Bundle;
import android.app.Activity;
import android.content.ContentValues;
import android.content.Intent;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class ActivityMain_1 extends Activity {
//声明EditText实例
private EditText et1,et2,et3;
//声明Button实例
private Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.main_1);
//根据ID获得实例对象
et1 = (EditText) findViewById(R.id.EditText01);
et2 = (EditText) findViewById(R.id.EditText02);
et3 = (EditText) findViewById(R.id.EditText03);
button = (Button) findViewById(R.id.button);
//事件
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String name=et1.getText().toString();
String url =et2.getText().toString();
String desc = et3.getText().toString();
ContentValues values = new ContentValues();
values.put("name", name);
values.put("url", url);
values.put("desc", desc);
//实例化数据库帮助类
DBHelper helper = new DBHelper(getApplicationContext());
//打开数据库
helper.open();
//插入数据
helper.insert(values);
//实例化Intent
Intent intent = new Intent(ActivityMain_1.this,QueryActivity.class);
startActivity(intent);
helper.close();
}
});
}
}
<?xml version="1.0" encoding="UTF-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:id="@+id/TextView01" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="网站名称" /> <EditText android:id="@+id/EditText01" android:layout_width="fill_parent" android:layout_height="wrap_content" /> <TextView android:id="@+id/TextView02" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="URL" /> <EditText android:id="@+id/EditText02" android:layout_width="fill_parent" android:layout_height="wrap_content" /> <TextView android:id="@+id/TextView03" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="网站描述" /> <EditText android:id="@+id/EditText03" android:layout_width="fill_parent" android:layout_height="wrap_content" android:height="100px" /> <Button android:id="@+id/button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="添加" /> </LinearLayout>
类代码
package com.example.sqlitetest;
import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.DialogInterface;
import android.database.Cursor;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
public class QueryActivity extends ListActivity {
private ListView listView;
private Cursor c;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
//setContentView(R.layout.row);
//实例化数据库帮助类
final DBHelper help = new DBHelper(this);
help.open();
c= help.query();
query();
//提示对话框
final AlertDialog.Builder builder = new AlertDialog.Builder(this);
listView.setOnItemClickListener(new OnItemClickListener(){
@Override
public void onItemClick(AdapterView<?> parent, View view,int position, long id) {
final long temp = id;
builder.setMessage("真的要删除该条记录吗？").setPositiveButton("是", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
System.out.println("yes");
help.del((int)temp);
//重新查询
//query();
Cursor c = help.query();
//列表项数组
String[] from ={"_id","name","url","desc"};
//列表项ID
int[] to ={R.id.text0,R.id.text1,R.id.text2,R.id.text3};
//适配器
SimpleCursorAdapter adapter = new SimpleCursorAdapter(getApplicationContext(),R.layout.row,c,from,to);
ListView listView = getListView();
listView.setAdapter(adapter);
}
}).setNegativeButton("否", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
});
builder.create();
builder.show();
}
});
}
@Override
protected void onStop() {
// TODO Auto-generated method stub
super.onStop();
}
public void query(){
//列表项数组
String[] from ={"_id","name","url","desc"};
//列表项ID
int[] to ={R.id.text0,R.id.text1,R.id.text2,R.id.text3};
//适配器
SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,R.layout.row,c,from,to);
//adapter.notifyDataSetChanged();
//列表视图
listView = getListView();
//为列表视图添加适配器
listView.setAdapter(adapter);
}
}
界面布局
<?xml version="1.0" encoding="UTF-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_gravity="center_vertical" > <TextView android:id="@+id/text0" android:layout_width="wrap_content" android:layout_height="wrap_content" android:paddingRight="10px" /> <TextView android:id="@+id/text1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:paddingRight="10px" /> <TextView android:id="@+id/text2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:paddingRight="10px" /> <TextView android:id="@+id/text3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:paddingRight="10px" /> </LinearLayout>
package com.example.sqlitetest;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class DBHelper extends SQLiteOpenHelper {
private static final String DB_NAME="coll.db";
//????
private static final String TBL_NAME="logtable";
//????SQL???
private static final String CREATE_TBL = "create table logtable " +
"(_id integer primary key autoincrement,name text,url text,desc text)";
//SQLiteDatabase???
private SQLiteDatabase db;
public DBHelper(Context context) {
super(context, DB_NAME, null, 2);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(CREATE_TBL);
}
//??????
public void open(){
db = getWritableDatabase();
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
}
//??????
public void insert(ContentValues values){
db.insert(TBL_NAME, null, values);
}
//???????
public Cursor query(){
Cursor c = db.query(TBL_NAME, null, null, null, null, null, null);
return c;
}
//???
public void del(int id){
db.delete(TBL_NAME, "_id=?", new String[]{String.valueOf(id)});
}
//???????
public void close(){
if (db != null){
db.close();
}
}
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.sqlitetest"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.sqlitetest.ActivityMain_1"
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="com.example.sqlitetest.QueryActivity"></activity>
</application>
</manifest>
android数据库 Android自带数据库SQLite 操作 一步一步 图示教程
原文地址：http://blog.csdn.net/wyx100/article/details/45556559
