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Data binding в массы! (1.2)

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Доклад Дениса Жучинского

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Data binding в массы! (1.2)

  1. 1. Data Binding в массы! Анохин Михаил / Android Developer / MWDN Ltd.
  2. 2. Data Binding ● представлен на Google I/O 2015 ● официальная библиотека от Google ● генерирует биндинг во время компиляции ● на данный момент доступна стабильная версия 1.0 и в процессе разработки находится версия 2.0 2
  3. 3. public class FindViewByIdFragment extends Fragment { private TextView firstName; private TextView lastName; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate( R.layout.fragment_simple_as_is, container, false); firstName = (TextView) view.findViewById(R.id.first_name); lastName = (TextView) view.findViewById(R.id.last_name); return view; } @Override public void onViewCreated(View view, Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); User user = User.getDefault(); firstName.setText(user.firstName); lastName.setText(user.lastName); } } <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <TextView android:id="@+id/first_name" android:layout_width="match_parent" android:layout_height="wrap_content" /> <TextView android:id="@+id/last_name" android:layout_width="match_parent" android:layout_height="wrap_content" /> </LinearLayout> findViewById 3
  4. 4. public class ButterKnifeFragment extends Fragment { @Bind(R.id.first_name) TextView firstName; @Bind(R.id.last_name) TextView lastName; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate( R.layout.fragment_simple_as_is, container, false); ButterKnife.bind(this, view); return view; } @Override public void onViewCreated(View view, Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); User user = User.getDefault(); firstName.setText(user.firstName); lastName.setText(user.lastName); } @Override public void onDestroyView() { super.onDestroyView(); ButterKnife.unbind(this); } } <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <TextView android:id="@+id/first_name" android:layout_width="match_parent" android:layout_height="wrap_content" /> <TextView android:id="@+id/last_name" android:layout_width="match_parent" android:layout_height="wrap_content" /> </LinearLayout> ButterKnife 4
  5. 5. Binding (Model) <layout xmlns:android="http://schemas.android.com/apk/res/android"> <data> <variable name="user" type="com.anokmik.databinding.model.User" /> </data> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@{user.firstName}"/> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@{user.lastName}"/> </LinearLayout> </layout> public class BindingModelFragment extends Fragment { @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate( R.layout.fragment_binding_model, container, false); FragmentBindingModelBinding binding = FragmentBindingModelBinding.bind(view); binding.setUser(User.getDefault()); return view; } } 5
  6. 6. Binding (Ids) public class BindingIdsFragment extends Fragment { private TextView firstName; private TextView lastName; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate( R.layout.fragment_binding_ids, container, false); FragmentBindingIdsBinding binding = FragmentBindingIdsBinding.bind(view); firstName = binding.firstName; lastName = binding.lastName; return view; } @Override public void onViewCreated(View view, Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); User user = User.getDefault(); firstName.setText(user.firstName); lastName.setText(user.lastName); } } <layout xmlns:android="http://schemas.android.com/apk/res/android"> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <TextView android:id="@+id/first_name" android:layout_width="match_parent" android:layout_height="wrap_content"/> <TextView android:id="@+id/last_name" android:layout_width="match_parent" android:layout_height="wrap_content"/> </LinearLayout> </layout> 6
  7. 7. Data Model public class User { private final String firstName; private final String lastName; public User(String firstName, String lastName) { this.firstName = firstName; this.lastName = lastName; } public String getFirstName() { return firstName; } public String getLastName() { return lastName; } } public class User { public final String firstName; public final String lastName; public User(String firstName, String lastName) { this.firstName = firstName; this.lastName = lastName; } } 7
  8. 8. Configuration android { … buildToolsVersion "23.0.2" … dataBinding { enabled = true } … } buildscript { repositories { jcenter() } dependencies { classpath 'com.android.tools.build:gradle:1.5.0' } } 8
  9. 9. Compile-time Generation View view = inflater.inflate(R.layout.fragment_main, container, false); FragmentMainBinding binding = FragmentMainBinding.bind(view); <data class="FragmentMainBinding"> ... </data> <data class=".FragmentMainBinding"> ... </data> <data class="com.example.FragmentMainBinding"> ... </data> 9 Generated classes location: /build/intermediates/classes/{$applicationId}/databinding
  10. 10. Variables and Imports public abstract User getUser(); public abstract void setUser(User user); public abstract Drawable getImage(); public abstract void setImage(Drawable image); public abstract String getText(); public abstract void setText(String text); <data> <import type="android.graphics.drawable.Drawable" /> <import type="com.anokmik.databinding.model.User" /> <variable name="user" type="User" /> <variable name="image" type="Drawable" /> <variable name="text" type="String" /> </data> 10
  11. 11. Variables and Imports <data> <import type="android.util.SparseArray"/> <import type="java.util.Map"/> <import type="java.util.List"/> <variable name="array" type="String[]" /> <variable name="list" type="List&lt;String>"/> <variable name="sparse" type="SparseArray&lt;String>"/> <variable name="map" type="Map&lt;String, String>"/> <variable name="index" type="int"/> <variable name="key" type="String"/> </data> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@{titles[0]}" /> <data> <import type="android.app.Fragment"/> <import type="android.support.v4.app.Fragment" alias="SupportFragment"/> </data> 11
  12. 12. Data Objects public class NotifyGreeting extends BaseObservable { private String name; @Bindable public String getName() { return name; } public void setName(String name) { this.name = name; notifyPropertyChanged(BR.name); } } public class ObservableGreeting { public ObservableString name = new ObservableString(); } 12
  13. 13. Include and Merge <layout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:bind="http://schemas.android.com/apk/res-auto"> <data> <variable name="user" type="com.example.User" /> </data> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <include layout="@layout/name" bind:user="@{user}" /> </LinearLayout> </layout> <layout xmlns:bind="http://schemas.android.com/apk/res-auto"> <data> <variable name="user" type="com.example.User"/> </data> <merge> <include layout="@layout/name" bind:user="@{user}"/> </merge> </layout> 13
  14. 14. Expressions ● mathematical +, -, /, *, % ● string concatenation + ● logical &&, || ● binary &, |, ^ ● unary +, -, !, ~ ● shift >>, >>>, << ● comparison ==, >, <, >=, <= ● instanceof ● grouping () ● literals - character, String, numeric, null ● cast ● method calls ● field access ● array access [] ● ternary operator ?: android:enabled="@{communicator.isLoginValid &amp; communicator.isPasswordValid}" 14
  15. 15. Null android:text="@{user.firstName ?? user.lastName}" android:text="@{user.firstName != null ? user.firstName : user.lastName}" android:visibility="@{communicator.greeting.name.length > 0 ? View.VISIBLE : View.GONE}" 15
  16. 16. Setters android:text="@{user.firstName}" bind:onClickListener="@{communicator.clickListener}" bind:textWatcher="@{communicator.loginTextWatcher}" bind:bindingText="@{communicator.greeting.name}" @BindingAdapter("bind:textWatcher") public static void setTextWatcher(TextView view, TextWatcher watcher) { view.addTextChangedListener(watcher); } @BindingAdapter("bind:bindingText") public static void setBindingText(TextView view, final ObservableString text) { view.addTextChangedListener(new SimpleTextWatcher() { @Override public void afterTextChanged(Editable s) { text.set(s.toString()); } }); } 16
  17. 17. Converters public class Converters { @BindingConversion public static String convertObservableToString(ObservableString observableString) { return observableString.get(); } } 17
  18. 18. Binding executor 18 private static final boolean USE_CHOREOGRAPHER = SDK_INT >= 16; ... protected ViewDataBinding(DataBindingComponent bindingComponent, View root, int localFieldCount) { ... if (USE_CHOREOGRAPHER) { mChoreographer = Choreographer.getInstance(); mFrameCallback = new Choreographer.FrameCallback() { @Override public void doFrame(long frameTimeNanos) { mRebindRunnable.run(); } }; } else { mFrameCallback = null; mUIThreadHandler = new Handler(Looper.myLooper()); } }
  19. 19. Binding execution 19 protected void requestRebind() { ... if (USE_CHOREOGRAPHER) { mChoreographer.postFrameCallback(mFrameCallback); } else { mUIThreadHandler.post(mRebindRunnable); } } private final Runnable mRebindRunnable = new Runnable() { @Override public void run() { ... executePendingBindings(); } }; public void executePendingBindings() { ... if (!mRebindHalted) { executeBindings(); ... } ... }
  20. 20. Generated binding 20 public class FragmentBindingModelBinding extends android.databinding.ViewDataBinding { ... @Override protected void executeBindings() { long dirtyFlags = 0; synchronized(this) { dirtyFlags = mDirtyFlags; mDirtyFlags = 0; } java.lang.String firstNameUser = null; java.lang.String lastNameUser = null; com.anokmik.databinding.model.User user = mUser; if ((dirtyFlags & 0x3L) != 0) { user = user; if (user != null) { firstNameUser = user.firstName; lastNameUser = user.lastName; } } if ((dirtyFlags & 0x3L) != 0) { this.mboundView1.setText(firstNameUser); this.mboundView2.setText(lastNameUser); } } ... }
  21. 21. New in 2.0-beta 21 Annotations: InverseBindingAdapter, InverseBindingMethod, InverseBindingMethods Interface: InverseBindingListener
  22. 22. References ● http://developer.android.com/tools/data-binding/guide.html ● https://www.youtube.com/watch?v=ssayKH0tudk ● https://www.youtube.com/watch?v=WdUbXWztKNY ● https://realm.io/news/data-binding-android-boyar-mount/ ● https://speakerdeck.com/rciovati/binding-data-with-android-databinding ● https://medium.com/@fabioCollini/android-data-binding-f9f9d3afc761 22
  23. 23. Спасибо за внимание! source: https://github.com/anokmik/data-binding mail: anokmik@gmail.com skype: anokmik

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