我是我的setOnClickListener给我一个错误吗？

当我将鼠标悬停在“ setOnClickListener”下的波浪状红色线条上时，会弹出消息，提示“无法解析符号setOnClickListener”，“ @ Override”说“此处不允许注释”。而且“查看v”中的v也给我一个错误。我在哪里弄糟？

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;

public class EmailReceiptActivity extends AppCompatActivity {


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

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.main_options_menu, menu);
    menu.findItem(R.menu.main_options_menu).setIntent(
            new Intent(EmailReceiptActivity.this, LaunchActivity.class));
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();
    //use the id of the item from main_options_menu
    if (id == R.id.logoff_menu_item) {
        super.onOptionsItemSelected(item);
        startActivity(item.getIntent());
    }

    return true;
}

Button btn_send = (Button)findViewById(R.id.send_receipt_button);
btn_send.setOnClickListener(new View.OnClickListener(){
    @Override
    //Use the name of the function you assigned to the xml design of the button
    public void onClick(View v){
        //Use the name of this class, and the name class where you want to be taken when the button is clicked.
        startActivity (new Intent(EmailReceiptActivity.this, SuccessActivity.class));
    }
}

}