HR contacted me on LinkedIn. We scheduled a conversation, but they didn't provide any information about the interview. I thought it was a sync call, but it turned out to be the interview. We discussed my experience, and then they started asking questions. It was my fault that I stated answers to their questions. The questions were easy, but I wasn't ready for it.

Which of these standard Java collections is fastest to use if you want to find a specific element?

• An unsorted Vector
• TreeSet
• A sorted LinkedList

In which order are the Activity lifecycle methods called?

• onCreate, onStart, onResume
• onCreate, onResume, onStart
• onStart, onCreate, onResume

What are Android Fragments used for?

• Creating a modularized UI
• Optimizing the garbage collector in Dalvik
• Loading data from multiple endpoints

Which thread will process a Message posted to a Handler?

• The UI thread
• The thread that created the Handler
• The thread that created the Message

Which thread executes the Service onCreate method?

• The UI thread
• A background thread
• The thread specified in the intent

Is the IntentService destroyed after handling all queued intents?

• Yes
• No

When will the system call a Service onDestroy method?

• When it’s explicitly stopped, regardless of any existing bindings
• Only when the system needs the memory
• When it’s in a stopped state and no bindings exist

If the UI thread is idle, and a background thread is busy-looping, when will the system display an Application Not Responding message?

• After 5 seconds
• After 10 seconds
• Never

Which of the following apps does Android consider most important to keep alive?

• A hidden app with a started service
• A visible app without any services
• A hidden app without any services