从android中的MVVM模式接触DataBinding

由于想理清项目的设计思路，从MVC模式看到了MVP模式，再到MVVM模式。大体上把安卓常用的模式过了一下，现整理下看MVVM模式时接触的DataBinding知识点。

本文主要为转载，所以请稳步参考文献：

https://www.cnblogs.com/ldq2016/p/6698181.html      《Android DataBinding库(MVVM设计模式)》

本文结束！！！！

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下文是学习时参考着文献自己试手的代码，

<?xml version="1.0" encoding="utf-8"?>
<layout>
    <data class="MyClassName">
        <import type="com.sxc.testmigusdk.mvvmdemo.bean.Crsh"/>
        <variable
            name="myUserObj"
            type="com.sxc.testmigusdk.mvvmdemo.bean.Crsh"/>
        <variable
            name="clickEvent"
            type="com.sxc.testmigusdk.mvvmdemo.click.OnClick"/>
        <variable
            name="crsh2"
            type="com.sxc.testmigusdk.mvvmdemo.bean.Crsh2"/>
    </data>

    <LinearLayout 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"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        tools:context="com.sxc.testmigusdk.mvpdemo.MainActivity">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@{myUserObj.name}"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent" />
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="60dp">
            <TextView
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:gravity="center"
                android:text="@{crsh2.name}"/>
            <TextView
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:gravity="center"
                android:text='@{"" + crsh2.age}'/>
            <TextView
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:gravity="center"
                android:text="@{String.valueOf(crsh2.age)}"/>
        </LinearLayout>
        <EditText
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:id="@+id/edit_text_name"/>
        <EditText
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:id="@+id/edit_text_pass"/>
        <Button
            android:layout_width="match_parent"
            android:layout_height="40dp"
            android:text="登录"
            android:id="@+id/sub_login_btn"/>
        <Button
            android:layout_width="match_parent"
            android:layout_height="40dp"
            android:text="DataBinding"
            android:onClick="@{clickEvent.showToast}"/>
        <WebView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/http_web_view"/>


    </LinearLayout>

</layout>

private MyClassName binding;
    private Crsh crsh;
    private Crsh2 crsh2;


protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        binding = DataBindingUtil.setContentView(this,R.layout.activity_main);
//        setContentView(R.layout.activity_main);
        crsh = new Crsh("crsh");
        binding.setMyUserObj(crsh);
        binding.setClickEvent(new OnClick());
        crsh2 = new Crsh2();
        binding.setCrsh2(crsh2);
        crsh2.name.set("fuck!!!!");
        crsh2.age.set(18);
 new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                crsh.setName("曹88888");
//                binding.setMyUserObj(crsh);
            }
        },5000);
}

public class Crsh2 {
    public ObservableField<String> name = new ObservableField<>();
    public ObservableInt age = new ObservableInt();
}

public class Crsh extends BaseObservable{
    private String name;

    public Crsh(String name) {
        this.name = name;
    }

    @Bindable
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
        notifyPropertyChanged(BR.name);
    }
}



public class OnClick {
    public void showToast(View view) {
        Toast.makeText(view.getContext(),"hello world",Toast.LENGTH_LONG).show();
    }
}