How to keep data between orientation changes

AbemaTVで実装している画面回転を支えるデータ保持についての話

Transcript

1. CA.apk #2 @CyberAgent
   Masaki Ogata
   ը໘ճసΛࢧ͑Δσʔλอ࣋ :)
   

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2. ࣗݾ঺հ
   Masaki Ogata
   CyberAgent, Inc. / AbemaTV, Inc.
   ogaclejapan
   @ogaclejapan
   New
   

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3. 2017೥4݄11೔ൃച
   ࢁށໜथɼࡔాߊҰɼࠇ઒༸ɼ౻ా
   ୖຏɼࢁాߤɼాࡔ࿨ெɼ۽୩஌ࢠɼ
   ৿ຊརതɼࡔຊ࿨େɼখܗণथɼླ
   ໦େوɼࢤำါلɹஶ
   B5൑ʗ192ϖʔδ
   ఆՁʢຊମ1,980ԁʴ੫ʣ
   ISBN 978-4-7741-8863-8
   https://goo.gl/Jcy3lJ
   New
   

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4. ը໘ճసΛࢧ͑Δσʔλอ࣋ :)
   by AbemaTV
   

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5. 2017/4 ॎରԠϦϦʔε͠·ͨ͠
   

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6. Կ͕มΘͬͨͷ͔ʁ
   

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7. xmlns:android="http://schemas.android.com/apk/res/android"
   package="tv.abema"
   >
   ...
   android:name=".components.activity.MainActivity"
   android:configChanges="orientation|keyboardHidden|
   screenSize"
   android:screenOrientation="sensorLandscape"
   android:theme="..."
   />
   ...
   
   AndroidManifest.xml
   

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8. AndroidManifest.xml
   xmlns:android="http://schemas.android.com/apk/res/android"
   package="tv.abema"
   >
   ...
   android:name=".components.activity.MainActivity"
   android:configChanges="orientation|keyboardHidden|
   screenSize"
   android:screenOrientation="sensorLandscape"
   android:theme="..."
   />
   ...
   
   

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9. AndroidManifest.xml
   xmlns:android="http://schemas.android.com/apk/res/android"
   package="tv.abema"
   >
   ...
   android:name=".components.activity.MainActivity"
   android:screenOrientation="behind"
   android:theme="..."
   />
   ...
   
   

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10. Activity࠶ੜ੒ͱ
    ৽͍͠ੜ׆࢝Ί·ͨ͠$
    

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11. ཧ༝̍ɿॎʗԣͰ࠷దͳUIΛ࣮ݱ͍ͨ͠
    

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12. ཧ༝̎ɿMultiWindowʹରԠ͍ͨ͠
    

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13. Activity࠶ੜ੒͸Կ͕໰୊ͳͷ͔ʁ
    

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14. Activity࠶ੜ੒ͷ໰୊఺ɿ
    • ϨΠΞ΢τঢ়ଶͷ෮ݩ

    ʢChannelɺFullscreenɺ…ʣ
    • αʔόʔ͔Βऔಘͨ͠σʔλͷ࠶ར༻
    • ॎʗԣͷը໘੾Γସ͑ͷγʔϜϨε͞
    

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15. ҰൠతͳΞϓϩʔν
    

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16. onSaveInstanceState(..)ͰBundle΁อଘ
    public class MainActivity extends AppCompatActivity {
    @Override
    protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    outState.putParcelable("foo", foo);
    ...
    }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
    ...
    if (savedInstanceState != null) {
    Foo foo = savedInstanceState.getParcelable("foo");
    }
    

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17. (‘A`)ΫιΊΜͲͤ͐͘ʔʂ
    

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18. AbemaTVͷΞϓϩʔν
    

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19. onRetainCustomNonConfigurationInstance()ͰObjectฦ͢
    public class MainActivity extends AppCompatActivity {
    @Override
    public Object onRetainCustomNonConfigurationInstance() {
    return foo;
    }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
    ...
    Object obj = getLastCustomNonConfigurationInstance();
    if (obj instanceof Foo) {
    Foo foo = (Foo) obj;
    }
    

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20. ͜Εͩ! ! ‷( ŋŷŋ)و ̑̑ ŞƄŕ !
    

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21. ͪΐͬ͜ͱιʔείʔυΛ௥ͬͯΈͨ
    

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22. FragmentActivity.java
    public Object onRetainCustomNonConfigurationInstance() {
    return null;
    }
    @Override
    public final Object onRetainNonConfigurationInstance() {
    ...
    Object custom = onRetainCustomNonConfigurationInstance();
    ...
    NonConfigurationInstances nci = new
    NonConfigurationInstances();
    nci.custom = custom;
    nci.fragments = fragments;
    nci.loaders = loaders;
    return nci;
    }
    

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23. Activity.java
    public Object onRetainNonConfigurationInstance() {
    return null;
    }
    NonConfigurationInstances retainNonConfigurationInstances() {
    Object activity = onRetainNonConfigurationInstance();
    ...
    NonConfigurationInstances nci = new
    NonConfigurationInstances();
    nci.activity = activity;
    nci.children = children;
    nci.fragments = fragments;
    nci.loaders = loaders;
    ...
    return nci;
    }
    

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24. ActivityThread.java
    public final ActivityClientRecord
    performDestroyActivity(IBinder token, boolean finishing) {
    return performDestroyActivity(token, finishing, 0, false);
    }
    private ActivityClientRecord performDestroyActivity(IBinder
    token, boolean finishing,
    int configChanges, boolean getNonConfigInstance) {
    ActivityClientRecord r = mActivities.get(token);
    ...
    if (getNonConfigInstance) {
    try {
    r.lastNonConfigurationInstances
    =
    r.activity.retainNonConfigurationInstances();
    ...
    

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25. ActivityThread.java
    private void handleRelaunchActivity(ActivityClientRecord tmp) {
    ...
    handleDestroyActivity(r.token, false, configChanges, true);
    ...
    ...
    handleLaunchActivity(r, currentIntent, "..");
    ...
    }
    private Activity performLaunchActivity(...) {
    activity.attach(appContext, ...,
    r.lastNonConfigurationInstances, ...);
    ...
    r.lastNonConfigurationInstances = null;
    

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26. Configuration ChangeʹΑΔ
    Activity࠶ੜ੒࣌ͷΈ෮ݩՄೳ
    

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27. AbemaTVͰ͸
    Ͳ͏࣮૷͍ͯ͠Δͷ͔ʁ
    

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28. AbemaTVͷΞʔΩςΫνϟɿ
    https://speakerdeck.com/ogaclejapan/flux-de-relax
    

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29. AbemaTVͷFluxΞʔΩςΫνϟɿ
    

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30. ը໘ճసͰഁغͤ͞ͳ͍DaggerͷComponentΛؚΊΔ
    @Override public ScreenComponent getScreenComponent() {
    if (screenComponent == null) {
    ScreenInstance retainedInstance = (ScreenInstance)
    getLastCustomNonConfigurationInstance();
    if (retainedInstance == null) {
    ...
    screenComponent = Components.forApp(this).plus(...);
    } else {
    screenComponent = retainedInstance.component;
    }
    }
    return screenComponent;
    }
    @Override public Object
    onRetainCustomNonConfigurationInstance() {
    return new ScreenInstance(screenComponent, ...);
    }
    

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31. AbemaTVͷDIίϯϙʔωϯτߏ੒ɿ
    AppComponent: ʢશମʣ
    ScreenComponent: ʢը໘୯Ґʣ
    ActivityComponent: ʢը໘୯Ґʣ
    ը໘ճసΛӽ͑ͯσʔλΛอ࣋͢ΔͨΊʹ
    ScreenίϯϙʔωϯτΛ௥Ճɻ
    

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32. Activity࠶ੜ੒ͷ໰୊఺ɿ
    •ϨΠΞ΢τঢ়ଶͷ෮ݩ 

    ʢChannelɺFullscreenɺ…ʣ
    • αʔόʔ͔Βऔಘͨ͠σʔλͷ࠶ར༻
    • ॎʗԣͷը໘੾Γସ͑ͷγʔϜϨε͞
    

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33. ͓ΘΓʹ
    /**
    * Return the value previously returned from
    * {@link #onRetainCustomNonConfigurationInstance()}.
    */
    @SuppressWarnings("deprecation")
    public Object getLastCustomNonConfigurationInstance() {
    NonConfigurationInstances nc = (NonConfigurationInstances)
    getLastNonConfigurationInstance();
    return nc != null ? nc.custom : null;
    }
    d..deprecation!??
    

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34. ଎͞ͱϦεΫ͸ࢴҰॏ
    

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