[置顶] 使用Android databinding进行动态布局
Kay16W
9年前
来自： http://blog.csdn.net//guijiaoba/article/details/49182577
Google 最近公布了Android mvvm架构，可以使用databinding做些赋值和渲染界面的操作。
了解到Jsp中使用EL表达式，可以做些简单的赋值和表达式运算。
然后我写一个简单的库，可以使用Android的Databinding进行动态布局，布局的大小可以通过表达式来计算。
比如一个view的高度是屏幕宽度的三分之一，然后再减10dp。可以这样使用。
width = "@{dimen.screenWidth/3 - dimen.dp(10)}" 下面是Github连接
AndroidSizeUtil
下面是文档：
AndroidSizeUtil
Desc
AndroidSizeUtil is use android mvvm(databinding) architecture.
It is easy to compose layout, like html. Use percentage or expression in xml file to compose layout.
Usage
#1
Your app project must use android mvvm(databinding) architecture.
Android mvvm doc
#2
Gradle compile
repositories { maven { url "https://raw.githubusercontent.com/LiushuiXiaoxia/AndroidSizeUtil/master/repo/" } } compile 'cn.mycommons:androidsizeutil:1.0.0' #3
Init AndroidSizeUtil in android Application or Activity.
public class AppContext extends Application { @Override public void onCreate() { super.onCreate(); AndroidSizeUtil.init(this); } } #4
Improt AndroidSizeUtil in xml.
<?xml version="1.0" encoding="utf-8"?> <layout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools"> <data> <variable name="dimen" type="cn.mycommons.androidsizeutil.DimenUtil" /> </data> </layout>
#5
Use dimen to compose view or layout like this.
<TextView android:layout_width="wrap_content" android:layout_height="wrap_content" app:layout_height="@{dimen.csh/3}" app:layout_marginLeft="@{dimen.csw/3}" app:layout_marginTop="@{0}" app:layout_width="@{dimen.csw*2/3}" /> #6
Use databind in activity.
ContentMainBinding is generate java file by android databinding.
public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ContentMainBinding.bind(findViewById(R.id.content_main)).setDimen(AndroidSizeUtil.newDimenUtil()); } } Api
Attributes set width, height, paddding, margin. The unit is px.
app:layout_width // set view width app:layout_height // set view height android:paddingLeft // set view paddingLeft android:paddingRight // set view paddingRight android:paddingTop // set view paddingTop android:paddingBottom // set view paddingBottom app:paddingLeft // set view paddingLeft app:paddingRight // set view paddingRight app:paddingTop // set view paddingTop app:paddingBottom // set view paddingBottom android:layout_marginLeft // set view layout_marginLeft android:layout_marginRight // set view layout_marginRight android:layout_marginTop // set view layout_marginTop android:layout_marginBottom // set view layout_marginBottom app:layout_marginLeft // set view layout_marginLeft app:layout_marginRight // set view layout_marginRight app:layout_marginTop // set view layout_marginTop app:layout_marginBottom // set view layout_marginBottom
Expression to set size.
// 100% screen width app:layout_width="@{dimen.sw}" app:layout_width="@{dimen.screenWidth}" // 1/2 screen height app:layout_height="@{dimen.sh/2}" app:layout_height="@{dimen.screenHeight/2}" // 100px app:layout_width="@{100}" app:layout_width="@{dimen.px(100)}" // 100dp app:layout_width="@{dimen.dp(100)}" // 100dp - 10px app:layout_width="@{dimen.dp(100)-10}" Set view or layout size.
// 100dp * 100dp app:size="@{dimen.sizeDp(100,100)}" // 100px * 100px app:size="@{dimen.size(100,100)}" // 100dp * 100px app:size="@{dimen.size(dimen.dp(100),100)}" // screenWidth * 100px app:size="@{dimen.size(dimen.screenWidth,100)}" Java api.
DimenUtil.java
LayoutUtil.java
Demo
<?xml version="1.0" encoding="utf-8"?> <layout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools"> <data> <variable name="dimen" type="cn.mycommons.androidsizeutil.DimenUtil" /> </data> <RelativeLayout android:id="@+id/content_main" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" app:layout_behavior="@string/appbar_scrolling_view_behavior" tools:context=".MainActivity" tools:showIn="@layout/activity_main"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="#faa" android:gravity="center" android:text="1" app:size="@{dimen.size(dimen.csw/3,dimen.csh/3)}" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="#f00" android:gravity="center" android:text="2" app:layout_height="@{dimen.csh/3}" app:layout_marginLeft="@{dimen.csw/3}" app:layout_marginTop="@{0}" app:layout_width="@{dimen.csw*2/3}" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="#f0f" android:gravity="center" android:text="3" app:layout_height="@{dimen.csh*2/3}" app:layout_marginLeft="@{0}" app:layout_marginTop="@{dimen.csh/3}" app:layout_width="@{dimen.csw/3}" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="#ff0" android:gravity="center" android:text="4" app:layout_height="@{dimen.csh*2/3}" app:layout_marginLeft="@{dimen.csw/3}" app:layout_marginTop="@{dimen.csh/3}" app:layout_width="@{dimen.csw*2/3}" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="#0f0" android:gravity="center" android:text="5" app:layout_marginLeft="@{dimen.csw/3-dimen.dp(50)}" app:layout_marginTop="@{dimen.csh/3-dimen.dp(50)}" app:size="@{dimen.sizeDp(100,100)}" /> </RelativeLayout> </layout> 
Gradle
repositories { maven { url "https://raw.githubusercontent.com/LiushuiXiaoxia/AndroidSizeUtil/master/repo/" } } compile 'cn.mycommons:androidsizeutil:1.0.0'