Android Databinding Library

Android Databinding Library

• 1.
  Android'Data'Binding'Library Takuji'Nishibayashi
• 2.
  About&me • Takuji(Nishibayashi • @takuji31 •Fenrir(Inc. • Nintendo(Network(ID(available!!! • Udemae:(BD(/(Rank:(20
• 3.
  About&me • Android(engineer((2010/02~) • Loves(Kotlin •Interest(RoboVM
• 4.
  Data$Binding
• 5.
  android'binding
• 6.
  Not$ac've$!
• 7.
  RoboBinding
• 8.
  Not$work$with$AppCompat$!
• 9.
  RxBinding
• 10.
  Not$tested...
• 11.
  One$way(only
• 12.
  Code%only
• 13.
  Xamarin'+'MvvmCross'/'Forms'etc.
• 14.
  Cool
• 15.
  Cross%pla)orm%!!!
• 16.
  but$..
• 17.
  Too#expensive#for#private# development
• 18.
  DIY!
• 19.
  Next%day
• 20.
  Google&I/O&2015
• 21.
  Android'Data'Binding'Library
• 22.
  !
• 23.
  Usage
• 24.
  build.gradle buildscript { repositories { jcenter() } dependencies{ classpath "com.android.tools.build:gradle:1.3.0-beta1" classpath "com.android.databinding:dataBinder:1.0-rc1" } }
• 25.
  build.gradle apply plugin: 'com.android.application' applyplugin: 'com.android.databinding'
• 26.
  View%model public class ViewModelextends BaseObservable { @Bindable public String getFirstName() {} @Bindable public String getLastName() {} @Bindable public OffsetDateTime getLastUpdated() {} public void setFirstName(String firstName) { this.firstName = firstName; notifyPropertyChanged(BR.firstName); } public void setLastName(String lastName) { this.lastName = lastName; notifyPropertyChanged(BR.lastName); } public void setLastUpdated(OffsetDateTime lastUpdated) { this.lastUpdated = lastUpdated; notifyPropertyChanged(BR.lastUpdated); } }
• 27.
  Converter public class Converters{ @BindingConversion public static String convertOffsetDateTime(OffsetDateTime dateTime) { return dateTime != null ? dateTime.format(DateTimeFormatter.ISO_OFFSET_DATE_TIME) : ""; } private Converters() {} }
• 28.
  Layout'XML <layout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" tools:context=".MainActivity"> <data> <variable name="viewModel"type="jp.takuji31.databindingexample.ViewModel" /> </data> <!-- ... --> <TextView android:text="@{viewModel.firstName + ' ' + viewModel.lastName}" /> <TextView android:text="@{viewModel.lastUpdated}" /> <!-- ... --> </layout>
• 29.
  Ac#vity //onCreate ActivityMainBinding binding =DataBindingUtil.setContentView(this, R.layout.activity_main); binding.setViewModel(viewModel); binding.firstNameEditText.addTextChangedListener(new TextWatcher() { public void onTextChanged(CharSequence s, int start, int before, int count) { viewModel.setFirstName(s.toString()); } }); binding.lastNameEditText.addTextChangedListener(new TextWatcher() { public void onTextChanged(CharSequence s, int start, int before, int count) { viewModel.setLastName(s.toString()); } }); binding.submitButton.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { viewModel.setLastUpdated(OffsetDateTime.now()); } });
• 30.
  Run
• 31.
  Good • Auto&data&binding&more&less&codes • Support&most&Android&version&(2.1~) •Binding&adapter • Converter
• 32.
  Good • Expression+support • No+more+findViewById! •No+more+ViewHolder!
• 33.
  Bad • One%way%binding%only! • Supported%future? •Unstable%support%(Android%Studio) • development%in%progress • Cannot%use%Kotlin%(Kotlin%M11%used%internally)
• 34.
  Example
• 35.
  github.com/takuji31/databinding3 example
• 36.
  Thank&you!