使用finishActivity()时什么是请求代码

// 发送请求的活动
public class MainActivity extends AppCompatActivity {
    private static final int REQUEST_CODE = 1;

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

        // 启动另一个活动并传递请求代码
        Intent intent = new Intent(MainActivity.this, SecondActivity.class);
        startActivityForResult(intent, REQUEST_CODE);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        // 根据请求代码处理不同的结果
        if (requestCode == REQUEST_CODE) {
            if (resultCode == RESULT_OK) {
                // 处理成功的结果
            } else if (resultCode == RESULT_CANCELED) {
                // 处理取消的结果
            }
        }
    }
}

// 接收请求的活动
public class SecondActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);

        // 处理请求并设置结果
        Intent intent = new Intent();
        setResult(RESULT_OK, intent);

        // 关闭当前活动，并传递结果和请求代码
        finishActivity(REQUEST_CODE);
    }
}