android连接数据库（使用oracle直接连接）

1.首先导入ojdbc14.jar包

2.这是首页面

package com.android.logins;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;



import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

import android.widget.EditText;
import android.widget.Toast;

public class LoginActivity extends Activity {
    /** Called when the activity is first created. */
    EditText userName;
    EditText password;
    Button btn_login;
    String userNameValue, passwordValue;
    Connection connection = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        userName = (EditText) findViewById(R.id.et_zh);
        password = (EditText) findViewById(R.id.et_mima);
        btn_login = (Button) findViewById(R.id.btn_login);

        try {
            Class.forName("oracle.jdbc.driver.OracleDriver");
            connection = DriverManager.getConnection(
                    "jdbc:oracle:thin:@192.168.100.109:1521:orcl", "show",
                    "show");
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            System.out.println("加载程序驱动出错");
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        btn_login.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                try {
                    String sql = "select * from userlogin ";
                    Statement stmt = connection.createStatement();
                    ResultSet rSet = stmt.executeQuery(sql);
                    userNameValue = userName.getText().toString();
                    passwordValue = password.getText().toString();
                    while (rSet.next()) {
                        System.out.println(rSet.getString("name"));
                        System.out.println(rSet.getString("password"));
                        if (userNameValue.equals(rSet.getString("name"))
                                && passwordValue.equals(rSet
                                        .getString("password"))) {
                            Toast.makeText(LoginActivity.this, "登录成功",
                                    Toast.LENGTH_SHORT).show();
                            Intent intent = new Intent(LoginActivity.this,
                                    WelcomeAvtivity.class);
                            startActivity(intent);
                        } else {
                            Toast.makeText(LoginActivity.this,
                                    "用户名或密码错误，请重新登录", Toast.LENGTH_SHORT)
                                    .show();
                        }
                    }
                    rSet.close();
                    stmt.close();
                } catch (Exception e) {
                    System.out.println(e.getMessage().toString());
                } finally {
                    if (connection != null) {
                        try {
                            connection.close();
                        } catch (Exception e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                    }
                }
            }
        });

    }

}

3.注意AndroidManifest.xml的文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.android.logins"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".LoginActivity"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
     由于由跳转，所以在这里必须写，注意，以后如果在跳转页面中使用到，在这里都必须定义   <activity android:name=".WelcomeAvtivity"></activity>
    </application>
    <uses-sdk android:minSdkVersion="8" />
   定义权限，连接网络，这里必须写 <uses-permission android:name="android.permission.INTERNET"></uses-permission>
</manifest> 

 以上是我做的一个基础的连接数据库，由于本人现在也是初学者，如有不足之处，请大家指出，相互学习