Android进阶---android databinding 使用

最新推荐文章于 2025-06-03 21:29:52 发布

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最新推荐文章于 2025-06-03 21:29:52 发布

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分类专栏： android架构 android进阶之路文章标签： databind binding MVVM

本文链接：https://blog.youkuaiyun.com/DG_summer/article/details/78192812

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本文介绍了Android Data Binding的配置步骤，包括在模块中添加依赖，创建Model实体类，改造布局文件，以及在Activity中绑定使用。讲解了Data Binding的基础用法，如何自动更新UI，并详细阐述了API文档中的知识，如数据关联、变量定义、事件处理。同时，还探讨了在RecyclerView中应用Data Binding的方法，包括RecyclerItemBinding的生成和Adapter的创建。

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1.配置,

在 module里面添加

android {   
     ....   
     dataBinding {        
       enabled = true   
     }
}

2.基础使用

创建简单的model实体类

public class SwordMan{
    private String name;
    private String level;

    public SwordMan(String name, String level) {
        this.name = name;
        this.level = level;
    }

    public String getName() {
        return name;
    }

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


    public String getLevel() {
        return level;
    }

    public void setLevel(String level) {
        this.level = level;

    }
}

编写布局文件：需要根布局变成layout

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android">

    <data>

        <variable
            name="swordsman"
            type="com.light.testdatabinding.SwordMan" />
    </data>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:orientation="vertical">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@={swordsman.name}" />
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@{swordsman.leval}" />
    </LinearLayout>

</layout>

activty里面绑定使用

ActivityMainBinding binding = DataBindingUtil.setContentView(this,R.layout.activity_main);
SwordMan swordMan=new SwordMan("你好","点击我");
binding.setSwordsman(swordMan);

补充

以上就是databinding基础使用,我们给实体类赋值以后textview的text会自动改变。ActivityMainBinding是根据绑定的布局名称自动生成的。它的作用就相当于布局一个替代类

3.知识讲解,详细介绍阅读API文档

根布局layout替代，里面的布局不变
data节点用来关联定义数据,里面的variable节点（一个节点相当于一个实体类）：name属性表示变量的名作，type表示变量的类型。import节点导入一个类的包，他的使用和type类似。如下。

  <data>
        <import type="java.util.Date"/>

        <variable
            name="swordsman"
            type="com.light.testdatabinding.SwordMan" />
        <variable
            name="time"
            type="Date" />
    </data>

当我们绑定一个布局以后，就可以通过对象直接获取id:test就是布局里面textview的id

ActivityMainBinding binding = DataBindingUtil.setContentView(this,R.layout.activity_main);
binding.test.setText("测试");

事件处理：直接通过binding对象操作id

 binding.btnTest.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                swordMan.setName("重置");
                startActivity(new Intent(MainActivity.this,Main2Activity.class));
            }
        });

4.recyclerview使用databinding

recyclerviewr布局

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">
        <android.support.v7.widget.RecyclerView
            android:id="@+id/recycler"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

        </android.support.v7.widget.RecyclerView>
    </LinearLayout>

</layout>

recyclerviewr item布局

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android">

    <data>

        <import type="com.light.testdatabinding.OBSwordMan" />

        <variable
            name="swordman"
            type="OBSwordMan" />
    </data>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:orientation="vertical">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="@{swordman.name}" />

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="@{swordman.level}" />
    </LinearLayout>

</layout>

实体类


public class OBSwordMan extends BaseObservable {
    private String name;
    private String level;

    public OBSwordMan(String name, String level) {
        this.name = name;
        this.level = level;
    }

    public String getName() {
        return name;
    }

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

    public String getLevel() {
        return level;
    }

    public void setLevel(String level) {
        this.level = level;

    }
}

recyclerview Adapter创建,RvItemBinding类是更具布局名生成的类


public class SwordmanAdapter extends RecyclerView.Adapter<SwordmanAdapter.SwordmamViewHoler> {
    private List<OBSwordMan> manList;

    public SwordmanAdapter(List<OBSwordMan> manList) {
        this.manList = manList;
    }

    @Override
    public SwordmamViewHoler onCreateViewHolder(ViewGroup parent, int viewType) {
        RvItemBinding binding = DataBindingUtil.inflate(LayoutInflater.from(parent.getContext()), R.layout.rv_item, parent, false);
        return new SwordmamViewHoler(binding);
    }

    @Override
    public void onBindViewHolder(SwordmamViewHoler holder, int position) {
        OBSwordMan swordMan = manList.get(position);
        holder.getBinding().setSwordman(swordMan);

    }

    @Override
    public int getItemCount() {
        return manList.size();
    }

    public class SwordmamViewHoler extends RecyclerView.ViewHolder {
        RvItemBinding binding;

        public SwordmamViewHoler(ViewDataBinding binding) {
            super(binding.getRoot());
            this.binding = (RvItemBinding) binding;
        }

        public RvItemBinding getBinding() {
            return binding;
        }
    }
}

activity里面实现

public class Main2Activity extends AppCompatActivity {
    private ActivityMain2Binding binding;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        binding = DataBindingUtil.setContentView(this, R.layout.activity_main2);
        initRecycler();

    }

    private void initRecycler() {
        LinearLayoutManager manager = new LinearLayoutManager(this);
        binding.recycler.setLayoutManager(manager);
        SwordmanAdapter adapter = new SwordmanAdapter(getList());
        binding.recycler.setAdapter(adapter);
    }

    public List<OBSwordMan> getList() {
        List<OBSwordMan> list = new ArrayList<>();
        OBSwordMan obSwordMan = new OBSwordMan("张三", "生命如此短暂");
        OBSwordMan obSwordMan2 = new OBSwordMan("张三1", "生命如此短暂");
        OBSwordMan obSwordMan3 = new OBSwordMan("张三2", "生命如此短暂");
        OBSwordMan obSwordMan4 = new OBSwordMan("张三3", "生命如此短暂");
        OBSwordMan obSwordMan5 = new OBSwordMan("张三4", "生命如此短暂");
        list.add(obSwordMan);
        list.add(obSwordMan2);
        list.add(obSwordMan3);
        list.add(obSwordMan4);
        list.add(obSwordMan5);
        return list;
    }
}