Question

I m 开始从像这样的法典中读出一个版本:

public static final int MY_INTENT_FLAG = 1;
String documentName = "filename.pdf";
File file = new File(getFilesDir(), documentName);
if (file != null && file.exists()) {
   Uri filePathUri = Uri.fromFile(file);
   Intent intent = new Intent(Intent.ACTION_VIEW);
   intent.setDataAndType(filePathUri, "application/pdf");

   try {
      startActivityForResult(intent,MY_INTENT_FLAG);
   } catch (ActivityNotFoundException e) {...}
}

该文件对开放并读。然而,当我向来自pdf的读者发出背顿时,并不叫作精算师。为什么如此? 这完全是因为它的读者在完成学业时没有制定结果守则? 我在我的装置上有缩略语阅读器。

I want to know when I get back from the external Activity so that the user don t need to login again in this case.

感谢你提供的任何投入

Answer 1

Why is this? Can it simply be because that particular pdf reader does not set a result code when finishing? I have Acrobat Reader on my device.

是的,通常情况是这样。

为了收回成果,儿童活动需要打电话:,首先请打电话 )。如果“结果”没有传播给父母的活动。

Answer 2

You can get a onActivityResult() method but you can not get the result from child activity because it is not returning result by setResult()

并且你正在告诉你检查记录,以便你有其他办法核对记录。

<>>例如

You can save username and password to preference and you can read the login details from it If details present in it then user is login and if not then you can popup login screen to user.

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