4272413
Description
Flashcards by Alex Neves, updated more than 1 year ago
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Created by Alex Neves
almost 9 years ago
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| Question | Answer |
| How many threads does an Android Application have? | One |
| Each activity has its own thread: True or False? | False, they all share the thread of the application process they belong to |
| What is a Looper? | A looper is a queue of events to be processed by an application |
| Give an example of how the OS uses Loopers | To queue UI interactions for a particular application |
| What happens if an event takes longer than 5 seconds to process? | An "Application Not Responding" Toast appears, giving the user a chance to terminate the application |
| What are the 2 golden rules related to threading on Android? | Do not block the UI thread and do not access the UI from outside of the UI thread |
| What is a Handler? | An object used to communicate with a specific thread |
| How are Handlers communicated with? | By queueing messages / runnables to be processed |
| How can we safely access the UI from outside of the UI thread? | By executing a runnable using Activity.runOnUiThread() |
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