连接数据库，但是很慢

app/src/main/java/hunnu/sj/raise_money/DataBase/DatabaseHelper.java

@@ -1,29 +1,8 @@
 package hunnu.sj.raise_money.DataBase;
-import android.content.Context;
-import android.database.sqlite.SQLiteDatabase;
-import android.database.sqlite.SQLiteDatabase.CursorFactory;
-import android.database.sqlite.SQLiteOpenHelper;
-import android.provider.ContactsContract;
-
 import java.sql.Connection;
 import java.sql.DriverManager;
-import java.sql.PreparedStatement;
-import java.sql.ResultSet;
-
-public class DatabaseHelper /*extends SQLiteOpenHelper*/ {
-    /*static String name="user.db";
-    static int dbVersion=1;
-    public DatabaseHelper(Context context) {
-        super(context, name, null, dbVersion);
-    }
-
-    public void onCreate(SQLiteDatabase db) {
-        String sql="create table user(id integer primary key autoincrement,username varchar(20),password varchar(20),role varchar(20))";
-        db.execSQL(sql);
-    }
-    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
 
-    }*/
+public class DatabaseHelper {
     private static DatabaseHelper db = null;
     private static Connection conn = null;
     public static DatabaseHelper getDb(){

app/src/main/java/hunnu/sj/raise_money/RegiteActivity.java

@@ -7,12 +7,9 @@ import android.content.Intent;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Message;
-import android.provider.MediaStore;
 import android.view.View;
 import android.widget.EditText;
 import android.widget.RadioButton;
-import android.widget.RadioGroup;
-import android.widget.Toast;
 
 import hunnu.sj.raise_money.DataBase.UserService;