Android Intent.getStringExtra() 返回 null [英] Android Intent.getStringExtra() returns null

问题描述

这是将字符串添加到 Extras 的方式:

This is how strings are being added to Extras:

Intent i = new Intent();
i.putExtra("Name", edt_name.getText());
i.putExtra("Description", edt_desc.getText());
i.putExtra("Priority", skb_prior.getProgress());
setResult(RESULT_OK, i);
finish();

这是我尝试在 onActivityResult() 中提取它们的方式:

This is how I try to extract them in onActivityResult():

String name = data.getStringExtra("Name");
String desc = data.getStringExtra("Description");
int prior   = data.getIntExtra("Priority", 50);

但是在第二个代码块之后 name 和 desc 是 null 的，尽管 prior 是正确的价值.此外，在调试器中，我可以看到 data.mExtras.mMap 包含所需的字符串，但仅在第一次请求之后.

But after the second code block name and desc are null's, though prior has it's proper value. Moreover, in debugger I can see, that data.mExtras.mMap contains needed Strings, but only after first request to it.

推荐答案

当您插入 Extras 时尝试添加 .toString()

When you insert your Extras trying adding .toString()

i.putExtra("Name", edt_name.getText().toString());

您在其中看到了 CharSequence 值，但您需要将其转换为 String 以调用 getStringExtra().显然，只需对 Strings 执行此操作.您会看到 int 的正确值，因为这是正确完成的

You are seeing the CharSequence value in there but you need to convert it to a String to call getStringExtra(). Obviously, just do this for the Strings. You see the correct value for your int because that is done correctly

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