OrenBochman

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OrenBochman

Improve code inspection with annotations

Depend on support-annotations

dependencies { implementation 'com.android.support:support-annotations:24.2.0' }

see also:

• https://developer.android.com/studio/write/annotations
• https://github.com/androidannotations/androidannotations/wiki/Cookbook

OrenBochman

RecyclerView - Swipe to refresh Stub

1. add viewgroup to activity
2. add handler mySwipeRefreshLayout.setOnRefreshListener to the recycer
3. add a menu item - for accessibility
4. add menu handler

c.f. https://developer.android.com/training/swipe/add-swipe-interface

OrenBochman

RecyclerView - Adding Dividers

How to add deviders between recyclerview items.

Based on the book Pro Android UI.

OrenBochman

RecyclerView - Swipe to dismiss/accept

OrenBochman

Advanced Fragment Example - Master/Detail with a Strategy Factory

Implementing Master/Detail with:

• adaptive master_detail with a handset breakpoint
• a controller factory.
• Interface based contract between fragment/activity/controller whie keeping them decoupled

---

1. • main activity with implements the intererface for

OrenBochman

Handler - Stub

Use a Handler to run code on a given thread after a delay or repeat tasks periodically on a thread.

1. constructing a Handler and then
2. "posting" Runnable code to the event message queue on the thread to be processed

Handler can communicate with UI-thread

handler.post(); handler.postAtFrontOfQueue();

OrenBochman

AsyncTask

When to use this threading primitive?

1. for short (say up to 3 seconds) background tasks that would otherwise block the UI thread
2. thread abstraction
3. easy implimentation
4. easy ui communication

Caveats:

1. not lifecycle aware

OrenBochman

Threads - in Android

UI and Worker thread access

Android does not allow to access the UI from a worker tread.

This shows how to access the UI thread from a Worker thread. The following are some methods to access the UI.thread:

• Activity.runOnUiThread(Runnable)

OrenBochman

HandlerThread in Android

The HandlerThread is a convenience class that initiates a Looper within a Thread to process Runnable or Message objects. The Handler is used to handle the insertion of the Runnable or Message objects into the looper's queue: The Handler class supports several other ways to schedule a Message to be processed at a future time:

Queueing tasks

• sendMessage - Pushes a message onto the end of the message queue.
• sendMessageDelayed - Pushes a message onto the end of the message queue.