首先先连接MySQL 可以参考以下链接:
Android studio连接mysql(能踩的坑都踩了)_黑名单 2841703718的博客-CSDN博客_android studio连接mysql
需要注意的是,如果Android Studio连接MySQL失败,可以排查以下是不是MySQL没有开启远程连接,或者有没有改用户名,密码,ip,数据库名以及字段:
GRANT ALL PRIVILEGES ON *.* TO '用户名'@'%'IDENTIFIED BY '密码' WITH GRANT OPTION;
需要注意的是引入libs包,导入后可以在
app/build.gradle
文件中检查:
在文件中为我们的应用程序添加互联网权限
AndroidManifest.xml
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
接下来,从数据库中读取数据并在屏幕上显示信息。MainActivity java类下:
package com.example.party;
import androidx.appcompat.app.AppCompatActivity;
import android.annotation.SuppressLint;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.HashMap;
import java.util.Map;
public class homepage extends AppCompatActivity {
private static final String URL = "jdbc:mysql://192.168.00.00:3306/数据库名";
private static final String USER = "用户名";
private static final String PASSWORD = "密码";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_homepage);
new InfoAsyncTask().execute();
}
@SuppressLint("StaticFieldLeak")
public class InfoAsyncTask extends AsyncTask<Void, Void, Map<String, String>> {
@Override
protected Map<String, String> doInBackground(Void... voids) {
Map<String, String> info = new HashMap<>();
try (Connection connection = DriverManager.getConnection(URL, USER, PASSWORD)) {
String sql = "select usertype,userstate,userdel from usertable";
PreparedStatement statement = connection.prepareStatement(sql);
ResultSet resultSet = statement.executeQuery();
if (resultSet.next()) {
info.put("usertype", resultSet.getString("usertype"));
info.put("userstate", resultSet.getString("userstate"));
info.put("userdel", resultSet.getString("userdel"));
}
} catch (Exception e) {
Log.e("InfoAsyncTask", "Error reading school information", e);
}
return info;
}
@Override
protected void onPostExecute(Map<String, String> result) {
if (!result.isEmpty()) {
TextView textViewName = findViewById(R.id.text1);
TextView textViewAddress = findViewById(R.id.text2);
TextView textViewPhoneNumber = findViewById(R.id.text3);
textViewName.setText(result.get("usertype"));
textViewAddress.setText(result.get("userstate"));
textViewPhoneNumber.setText(result.get("userdel"));
}
}
}
}
最后就可以运行了。
原文以及代码Demo请参考以下链接:
如何使用 JDBC 从 Android 读取 MySQL 数据?_allway2的博客-CSDN博客_安卓jdbc访问mysql数据库
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