安卓入门开发学习-数据库相关

小白求助：
有两个Acitivity，在FirstActivity里创建数据库后，EditText输入数据，点击button1实现数据写入后清空，输入若干次后，点击button2实现跳转到SecondActivity，在其TextView里显示数据库所有的数据。

请问：SecondActivity要怎么写，如何在SecondActivity里实现读取数据库所有内容，并将其显示再TextView上？

这里附上FirstActivity建立数据库、内部类和点击事件的代码

public class myData extends SQLiteOpenHelper {
        public myData(Context context, String str) {
            super(context, str, null, 1);
            // TODO Auto-generated constructor stub
        }

        @Override
        public void onCreate(SQLiteDatabase db) {
            // TODO Auto-generated method stub
            String DATABASE_SQL = "CREATE TABLE " + "MYSTUDENTDB" + " ("
                    + "_ID" + " INTEGER primary key autoincrement, " + "NAME"
                    + " text not null, " + "STUID" + " text not null, "
                    + "CLASS" + " text not null, " + "EMAIL"
                    + " text not null " + ");";
            // "create table mytable (_ID,NAME, STUID, CLASS, EMAIL);"
            db.execSQL(DATABASE_SQL);
        }

        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
            // TODO Auto-generated method stub
        }
    }

    public void onClick(View v) {
        // TODO Auto-generated method stub
        AlertDialog.Builder builder = new AlertDialog.Builder(
                FinalWorkActivity.this);
        builder.setIcon(R.drawable.ic_launcher);

        myData helper = new myData(FinalWorkActivity.this,
                FinalWorkActivity.this.getFilesDir() + "/new_data.db");// 内部类
        SQLiteDatabase database = helper.getWritableDatabase();

        switch (v.getId()) {
        case R.id.bt1:// 添加元素

            ContentValues value1 = new ContentValues();
            value1.put("NAME", ied1.getText().toString());
            value1.put("STUID", ied2.getText().toString());
            value1.put("CLASS", ied3.getText().toString());
            value1.put("EMAIL", ied4.getText().toString());

            long i = database.insert("MYSTUDENTDB", null, value1);
            if (i == -1) {
                Toast.makeText(this, "添加失败", 0).show();
            } else {
                Toast.makeText(this, "添加成功", 0).show();
            }

            database.close();
            ied1.setText("");
            ied2.setText("");
            ied3.setText("");
            ied4.setText("");
            break;
            case R.id.bt2:// 全部条目

            Intent it1 = new Intent();
            it1.setClassFirstActivity.this, SecondActivity.class);
            startActivity(it1);
            break；

https://www.cnblogs.com/infocodez/p/8430677.html