07 Fragments

BBCU Intro
Review how to statically add a fragment
- https://github.com/dltra/FragmentExampleStatic/commits
  - Note: The onClick() method referenced by the Button in the fragment_a.xml is located in the its parent activity (MainActivity.java instead of FragmentA.java).
Make an application to demonstrate the following with fragments added dynamically
- FragmentTransaction
  - add(), replace(), remove(), hide(), show()
  - Assign a "TAG" to a fragment and access that fragment by findFragmentByTag()
- Use a Bundle to pass arguments to a Fragment
- Use a transition between Fragments or use this example
- Optional: use getChildFragmentManager() to use Fragment nesting

Additional notes from student experience:

view.getParent() - returns view's container

With an instance within a fragment (button for example):

view.getParent().getParent() would return the container of the fragment - often times a FrameLayout

In the following replacement code, please note that once ft has been committed, that transaction is done. You can't add anymore changes. You'd need to begin a new transaction and may assign it to ft if you want to initiate new fragment modifications.

// Begin the transaction

FragmentTransaction ft = getSupportFragmentManager().beginTransaction();

ft.replace(R.id.your_placeholder, new FooFragment());

ft.commit();

Video: Lab07 Demonstration and Introduction

Fragment Lifecycle

Advantages

Assignment Submission

Build the .apk file
- Rename the .apk file
- PeriodLabNumberLastFirstCustomName.apk
- P8L07aTraDanFragments.apk
Submit assignment
- Fragment class files
- MainActivity.java
- associated .xml files
- Video of fragment changes
- .apk file

Embellishment: Have fun portion

Add fragments encapsulating a text message (name, time, message, color, etc)
Flip through profile of people, special characters, animals, ...etc.
Turn each of your previous labs into fragments.
Submit as Lab07b
- P8L07bTraDanFragments.apk
- Submit video as appropriate