smsManager不会发送短信，也不会在应用程序中请求权限，尽管我在代码中请求了权限

<uses-permission android:name="android.permission.SEND_SMS" />

import android.telephony.SmsManager;

public class MainActivity extends AppCompatActivity {
    private static final String PHONE_NUMBER = "1234567890";
    private static final String MESSAGE = "Hello, World!";

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

        // 检查是否有发送短信的权限
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.SEND_SMS)
                != PackageManager.PERMISSION_GRANTED) {
            // 如果没有权限，则请求权限
            ActivityCompat.requestPermissions(this,
                    new String[]{Manifest.permission.SEND_SMS},
                    PERMISSION_REQUEST_SEND_SMS);
        } else {
            // 如果有权限，则发送短信
            sendSMS();
        }
    }

    private void sendSMS() {
        SmsManager smsManager = SmsManager.getDefault();
        smsManager.sendTextMessage(PHONE_NUMBER, null, MESSAGE, null, null);
    }

    // 处理权限请求的结果
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
                                           @NonNull int[] grantResults) {
        if (requestCode == PERMISSION_REQUEST_SEND_SMS) {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                // 如果用户授予了发送短信的权限，则发送短信
                sendSMS();
            } else {
                // 如果用户拒绝了发送短信的权限，则给出相应的提示
                Toast.makeText(this, "发送短信的权限被拒绝", Toast.LENGTH_SHORT).show();
            }
        }
    }
}