从列表和数据库中删除时，游标索引超出范围异常

Question

我刚刚开始学习SQlite，并在tutorialspoint上尝试了该示例。但是，从数据库中删除行时，下一个列表元素将获取其前面的元素的值，而我删除的那个元素之后的list元素将获取空值，并最终使游标索引超出范围。

public class DisplayEvent extends AppCompatActivity {

int from_Where_I_Am_Coming = 0;
private DBHelper mydb ;
TextView name ;
TextView descr;
int id_To_Update = 0;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_display_event);

    Toolbar toolbar = findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);


    name = (TextView) findViewById(R.id.editTextName);
    descr = (TextView) findViewById(R.id.editTextDescr);

    mydb = new DBHelper(this);

    Bundle extras = getIntent().getExtras();
    if(extras !=null) {
        int Value = extras.getInt("id");

        if(Value>0){

            Cursor rs = mydb.getData(Value);
            id_To_Update = Value;

                rs.moveToFirst();

                String nam = 
rs.getString(rs.getColumnIndex(DBHelper.EVENTS_COLUMN_NAME));
                String des = 
rs.getString(rs.getColumnIndex(DBHelper.EVENTS_COLUMN_DESCR));

                if (!rs.isClosed()) {
                    rs.close();
                }

                Button b = (Button) findViewById(R.id.button11);
                b.setVisibility(View.INVISIBLE);

                name.setText((CharSequence) nam);
                name.setFocusable(false);
                name.setClickable(false);

                descr.setText((CharSequence) des);
                descr.setFocusable(false);
                descr.setClickable(false);
        }
    }
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is 
present.
    Bundle extras = getIntent().getExtras();

    if(extras !=null) {
        int Value = extras.getInt("id");
        if(Value>0){
            getMenuInflater().inflate(R.menu.display_contact, menu);
        } else{
            getMenuInflater().inflate(R.menu.menu_main, menu);
        }
    }
    return true;
}


public boolean onOptionsItemSelected(MenuItem item) {
    super.onOptionsItemSelected(item);
    switch(item.getItemId()) {
        case R.id.Edit_event:
            Button b = (Button)findViewById(R.id.button11);
            b.setVisibility(View.VISIBLE);
            name.setEnabled(true);
            name.setFocusableInTouchMode(true);
            name.setClickable(true);

            descr.setEnabled(true);
            descr.setFocusableInTouchMode(true);
            descr.setClickable(true);

            return true;
        case R.id.Delete_event:

            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.setMessage(R.string.deleteEvent)
                    .setPositiveButton(R.string.yes, new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int id) {
                            mydb.deleteEvent(id_To_Update);
                            Toast.makeText(getApplicationContext(), "Deleted Successfully",
                                    Toast.LENGTH_SHORT).show();
                            Intent intent = new Intent(getApplicationContext(),Calendar.class);
                            startActivity(intent);
                        }
                    })
                    .setNegativeButton(R.string.no, new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int id) {
                            // User cancelled the dialog
                        }
                    });

            AlertDialog d = builder.create();
            d.setTitle("Are you sure");
            d.show();

            return true;
        default:
            return super.onOptionsItemSelected(item);

    }

}

}

这是我的DBHelper.java

public class DBHelper extends SQLiteOpenHelper {

public Integer deleteEvent (Integer id) {
    SQLiteDatabase db = this.getWritableDatabase();
    return db.delete("events",
            "id = ? ",
            new String[] { Integer.toString(id) });
}