Implicit intent cannot find Activity:android.content.ActivityNotFoundException

Here's what I encountered:android.content.ActivityNotFoundException:No Activity found to handle Intent {act=me.waye.in Tentdemo.intent.action.WAYE_ACTION Cat=[me.waye.intentdemo.intent.category.waye_category]} This error was encountered when learning the implicit activation activity, with the book being the crazy Android handout of Li Gang, which did not mention the question, and found the answer by reading the document:

Android treats all implicit intents passed to as startActivity() if they contained at least one category: " android.intent.category.DEFAULT " (The CATEGORY_DEFAULTconstant). Therefore, activities that is willing to receive implicit intents must include " android.intent.category.DEFAULT " in their intent filters. (Filters with " android.intent.action.MAIN " and " android.intent.category.LAUNCHER " settings is the exception. They mark activities that begin new tasks and that is represented on the launcher screen. They can include " android.intent.category.DEFAULT " in the list of categories, but don ' t need to.) See Using the intent matching, later, for more on these filters.)

An activity that accepts implicit intent must contain Android.intent.category.DEFAULT, but launcher and main exceptions can be added, but not necessary.

Implicit intent cannot find Activity:android.content.ActivityNotFoundException