AndroidStudio翻译时写的安卓软件笔记Kotlin+DataBinding
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# 选择配色
[https://www.materialpalette.com/](https://www.materialpalette.com/)
# 添加图标
[https://github.com/google/material-design-icons](https://github.com/google/material-design-icons)
# 启用DataBinding
## gradle配置
```
android {
...
dataBinding {
enabled = true
}
}
```
## 布局文件
```
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android">
<data>
<import type="android.view.View" />
<variable
name="vm"
type="com.pingfangx.tools.androidstudiotranslator.MainActivity" />
</data>
<RelativeLayout
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="15dp"
android:orientation="vertical"
tools:context="com.pingfangx.tools.androidstudiotranslator.MainActivity">
<android.support.design.widget.FloatingActionButton
android:layout_width="200dp"
android:layout_height="200dp"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_marginBottom="50dp"
android:layout_marginRight="50dp"
android:onClick="@{vm.onClickBtnAdd}"
android:scaleType="fitXY"
android:src="@drawable/ic_add_white_48dp" />
</RelativeLayout>
</layout>
```
* visibility需要的是整型，要用VISIBLE
## 代码绑定
```
val mHasProject = ObservableBoolean()
val binding: ActivityMainBinding = DataBindingUtil.setContentView<ActivityMainBinding>(this, R.layout.activity_main)
binding.setVm(this)
```
* java中的public final，在kotlin中只要val就够了
* DataBinding的类是根据布局文件命名的
# 在kotling中启用DataBinding
```
apply plugin: 'kotlin-kapt'
dependencies {
kapt "com.android.databinding:compiler:$android_plugin_version"
}
```
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