Android进阶---android databinding 使用

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 manList;    public SwordmanAdapter(List 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 getList() {        List 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;    }}

1.配置,

2.基础使用

3.知识讲解,详细介绍阅读API文档

4.recyclerview使用databinding

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