Intent的多余部分始终为null [英] Intent's extra is always null

问题描述

我正在尝试将int变量传递给另一个活动:

I'm trying to pass an int variable to another activity:

当前活动中:

Intent intent = new Intent(getApplicationContext(),PlayActivity.class);
intent.putExtra("position", position);
startActivity(intent);

在PlayActivity.onCreate:

Intent intent = getIntent();
String position = intent.getStringExtra("position");
int index = Integer.parseInt(position);

问题是，位置始终为null(并且parseInt()引发异常).
为什么?

Problem is, position is always null (and parseInt() throws exception).
Why?

推荐答案

由于它是int，因此没有多余的字符串.你应该有

There is no string extra to get since it is an int. You should have

Intent intent = getIntent();
int position = intent.getIntExtra("position");

我不确定您为什么要尝试获取String然后将其作为int发送时解析为int，假设position在您的第一个Activity中是int .如果不是这种情况，请给我更好的解释.

I'm not sure why you are trying to get a String then parse to an int when it is sent as an int, assuming position is an int in your first Activity. If that is not the case then please explain a little better.

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