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This article mainly introduces "what are the characteristics of Android application component Activity". In daily operation, I believe many people have doubts about the characteristics of Android application component Activity. Xiaobian consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts about "what are the characteristics of Android application component Activity?" Next, please follow the editor to study!

Notice that here we set the value of the taskAffinity property of MainActivity to "shy.luo.task.main.activity"

Set the taskAffinity property value of SubActivity to "shy.luo.task.sub.activity".

Recompile the program and run the application again on the simulator

Use the "adb shell dumpsys activity" command to take another look at the tasks that the system is running, and you will see:

[html] view plaincopyRunning activities (most recent first): TaskRecord {4069c020 # 4 A shy.luo.task.sub.activity} Run # 2: HistoryRecord {40725040 shy.luo.task/.SubActivity} TaskRecord {40695220 # 3 A shy.luo.task.main.activity} Run # 1: HistoryRecord {406b26b8 shy.luo.task/.MainActivity} TaskRecord {40599c90 # 2 A com.android.launcher} Run # 0: HistoryRecord {40646628 com.android.launcher/com.android.launcher2.Launcher}

As you can see here, SubActivity and MainActivity are running in different tasks.

The characteristics of Activity with "singleTask" startup mode set:

1. Activity with "singleTask" startup mode is set. When it starts, it will first look for the existence of a task in the system where the attribute value affinity is equal to its attribute value taskAffinity; if there is such a task, it will start in this task, otherwise it will start in the new task. Therefore, if we want Activity with "singleTask" startup mode set to start in a new task, we need to set a separate taskAffinity property value for it.

two。 If Activity with "singleTask" startup mode is not started in a new task, it will check in the existing task to see if the corresponding Activity instance already exists, and if so, it will end all the Activity on the Activity instance, that is, the Activity instance will eventually be on the top of the stack of the task.

At this point, the study on "what are the characteristics of Android application component Activity" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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