[置頂] 使用Android databinding進行動態布局
來自： http://blog.csdn.net//guijiaoba/article/details/49182577
Google 最近公布了Android mvvm架構，可以使用databinding做些賦值和渲染界面的操作。
了解到Jsp中使用EL表達式，可以做些簡單的賦值和表達式運算。
然后我寫一個簡單的庫，可以使用Android的Databinding進行動態布局，布局的大小可以通過表達式來計算。
比如一個view的高度是屏幕寬度的三分之一，然后再減10dp。可以這樣使用。
width = "@{dimen.screenWidth/3 - dimen.dp(10)}"
下面是Github連接
AndroidSizeUtil
下面是文檔：
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);
}
}</pre>
#4
Improt AndroidSizeUtil in xml.
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android=";
<data>
<variable name="dimen" type="cn.mycommons.androidsizeutil.DimenUtil" />
</data>
</layout></pre>
#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());
}
}</pre>
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}"</pre>
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)}"</pre>
Java api.
DimenUtil.java
LayoutUtil.java
Demo
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="
Gradle
repositories {
maven {
url "
compile 'cn.mycommons:androidsizeutil:1.0.0'</pre> </div>