在A(yíng)ndroid中訪(fǎng)問(wèn)電腦數據庫，問(wèn)電可以使用以下步驟：

1、據庫安裝MySQL JDBC驅動(dòng)

2、問(wèn)電添加網(wǎng)絡(luò )權限

在A(yíng)ndroidManifest.xml文件中添加網(wǎng)絡(luò )權限：

??220;`xml

<u(′?｀)sespermission android:name="android.permission.INTERNET" />

“`

3、腦數編寫(xiě)代碼連接數據庫

創(chuàng )建一個(gè)類(lèi)（(′?｀*)如DBHelper），據庫用于連接數據??庫：

“`java

impor??t java.sql.DriverManager;

import java.sヾ(′?｀)?ql.ResultSet;

import java.sql.State(′?｀)ment;

public class DBHelper {

private static final String URL = "jdbc:mysql://電腦IP地址：端口號/數據庫名";

private static final String USER = "用戶(hù)名";

public static Connection getConnection() {

Connection conn = null;

try {

Class.forName("com.mysql.jdbc.Driver");

conn = DriverManager.getConnection(URL,問(wèn)電 USER, PASSWORD);

} catch (E??xception e) {

e.printStackTrace();

}

return con??n;

}

}

“`

4、查詢(xún)數據

“`java

import androi(???)d??.os.Bundle;

import android.widget.ArrayAdapter;

import androidx.appcompat.app.AppCompatActiヽ(′▽?zhuān)?ノvity;

import java.sql.ResultSet;

import java.sql.Statement;

import java.util(′?｀).ArrayList;

import java.util.List;

public class MainActivit(′?｀)y extends AppCompatActivi??ty {

priva(′?ω?`)te ListView listView;

private List<String> dataList?? = new ArrayList<>();

private ArrayAdapter<String> ad┐(′?｀)┌apter;

@Override

protected void onCreate(Bundle sa??vedInsヽ(′?｀)ノtanceState) {

super.onCreate(savedInstanceS??tate);

setContentView(R.layout.activity_main);

adapter = new ArrayAdapter<>(this,問(wèn)電 android.R.layout.simple_list_it(′?｀*)em_1, dataList);

list(′▽?zhuān)?View.setAdapter(adapter);??

getDataFromDB();

}

Connection connection = null;

Statement statement = null;

ResultSet resultSet = null;

tr??y {

connection = DBHelper.getConnection();

statement = connection??.createStatement();

while (resultSet.next())?? {

dataList.add(d??ata);

}

} catch (Exception e) {

} finally {

try {

if (resultSet != null) {

}

if (statement != null) {

}

if (connection != null) {

connection.?close();

}

e.printStac(???)kTr??ace(???);

}

}

adap(′▽?zhuān)?ter.notifyDataSetChanged(); // 刷新列表顯示數據更新后的結果集內容，如果數據沒(méi)有變化，腦數可以省略這一步(bu)。據庫