我有两节课
OTPBroadcastReceiver-扩展BroadcastReceiver并从新到达的SMS中提取一次性密码（此后称为OTP）的类。
OTPListener-实际上是一个上一个类，其中带有一个回调的类将在收到SMS和提取OTP时执行该回调。
回调具有方法onOTPReceived(long timeReceived, final String otp)，该方法由OTPBroadcastReceiver执行，并在消息到达时以long和OTP消息作为String传递给它。
我的OTPListener中有一个内部类，它具有以下成员变量：-
private class OTPModel {
long timeReceived = 0L;
String otp = null;
}
此类用于存储OTP消息和接收消息的时间。
以下是OTPListener的代码
import android.content.Context;
import android.support.annotation.NonNull;
import android.widget.Toast;
import java.util.List;
class OTPListener {
private OTPReceivedInternal mOTPReceivedCallback;
private OTPModel mOTPModel;
OTPListener(@NonNull final Context context,
final List<SMSRule> smsRules,
@NonNull final CustomOTPView.OnOTPReceivedCallback onOTPReceivedCallback) {
mOTPModel = new OTPModel();
mOTPReceivedCallback = new OTPReceivedInternal() {
@Override
public void onOTPReceived(long timeReceived, String otp) {
if (mOTPModel.timeReceived == 0L) {
mOTPModel.timeReceived = timeReceived;
mOTPModel.otp = otp;
onOTPReceivedCallback.onOTPReceived(mOTPModel.otp);
System.out.println("First execution");
System.out.println("Value of mOTPModel.otp:" + mOTPModel.otp);
System.out.println(String.valueOf(mOTPModel.timeReceived));
} else {
if (!mOTPModel.otp.equals(otp)) {
if (timeReceived > mOTPModel.timeReceived) {
Toast.makeText(context, String.valueOf(timeReceived > mOTPModel.timeReceived),Toast.LENGTH_SHORT).show();
mOTPModel.timeReceived = timeReceived;
onOTPReceivedCallback.onOTPReceived(mOTPModel.otp = otp);
System.out.println("After first execution");
System.out.println("{{Value of mOTPModel.timeReceived:" + String.valueOf(mOTPModel.timeReceived));
System.out.println("Value of mOTPModel.otp:" + String.valueOf(mOTPModel.otp)+"}}");
}
}
}
}
};
new OTPBroadcastReceiver(context,smsRules,mOTPReceivedCallback);
}
private class OTPModel {
long timeReceived = 0L;
String otp = null;
}
protected interface OTPReceivedInternal {
void onOTPReceived(long timeReceived, String otp);
}
问题是
第一次执行时，
mOTPModel.timeReceived和mOTPModel.otp即使在以下赋值语句之后也均为空
mOTPModel.timeReceived = timeReceived;
mOTPModel.otp = otp;
而且唯一印在我的Android显示器上的是
System.out.println("First execution");
紧随其后的下两个语句甚至不会执行。
第二次执行时，代码的
else部分将被执行，但是这一次它将打印mOTPModel.otp和mOTPModel.timeReceived的旧值，随后的执行将继续显示以前的值。这是怎么了？为什么未正确分配OTPModel类的成员变量？
感谢您的时间！
最佳答案
我相信问题的原因不在您显示的代码范围内。侦听器在哪里实例化？是否创建了多个实例？
分配后，如何确定otp和timeReceived为空？也许也可以检查otp和timeReceived的传入值（通过调试或使用更多日志记录语句）。
找不到某些System.out.println的事实可能是您的日志记录有问题，或者是某些调试/线程问题使进程停止。
进一步的评论：
private OTPReceivedInternal mOTPReceivedCallback;
令人困惑的字段名称，我将其重命名为
otpReceivedInternal。特别是因为还有一个名为onOTPReceivedCallback的构造函数参数。onOTPReceivedCallback.onOTPReceived(mOTPModel.otp = otp);
令人困惑的成语。我将其拆分为：
mOTPModel.otp = otp;
onOTPReceivedCallback.onOTPReceived(otp);
这更具可读性。
编辑：所以这是我现在建议找出正在发生的变化
@Override
public void onOTPReceived(long timeReceived, String otp) {
// print the received values
System.out.printf("timeReceived = %s, otp = %s", timeReceived, otp);
if (mOTPModel.timeReceived == 0L) {
mOTPModel.timeReceived = timeReceived;
mOTPModel.otp = otp;
onOTPReceivedCallback.onOTPReceived(mOTPModel.otp);
// print the mOTPModel values
System.out.printf("1: mOTPModel.timeReceived = %s, mOTPModel.otp= %s", mOTPModel.timeReceived, mOTPModel.otp);
System.out.flush();
// ... carry on