学习路径

• 1, 入门篇
  • 1), 入门系列1-安装
  • 2), 入门系列2
  • 3), 入门系列2-2
  • 4), 入门系列3
• 2, 专题篇
  • 1), Data-Mediator专题之属性回调
  • 2), Data-Mediator 专题之注解
  • 3), Data-Mediator专题之Api篇
• 3, 源码阅读
  • 1), Data-Mediator 项目结构和源码阅读

简单demo

• 1, 假设我要定义关于学生的数据模型, 需要实现Serializable, Parcelable. 假如学生有。年龄，名称, id属性。 那么简单的数据定义为:

@Fields({@Field(propName = "age" , type = int.class),@Field(propName = "name" , type = String.class),@Field(propName = "id" , type = long.class),
})
public interface Student extends Serializable, Parcelable{
}
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• 2, 使用idea插件生成代码, 快捷键比如 alt + insert. （安装见这里Data-mediator入门系列1） 模型生成后类似这样

@Fields({@Field(propName = "age" , type = int.class),@Field(propName = "name" , type = String.class),@Field(propName = "id" , type = long.class),
})
public interface Student extends Serializable, Parcelable, DataPools.Poolable {Property PROP_age = SharedProperties.get(int.class.getName(), "age", 0);Property PROP_name = SharedProperties.get(String.class.getName(), "name", 0);Property PROP_id = SharedProperties.get(long.class.getName(), "id", 0);Student setAge(int age1);int getAge();Student setName(String name1);String getName();Student setId(long id1);long getId();
}
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• 3, 调用示例。

     //属性改变demo. 下面用butterknife快速写demopublic class TestPropertyChangeActivity extends BaseActivity {@BindView(R.id.tv_desc)TextView mTv_desc;@BindView(R.id.bt_set_text_on_TextView)Button mBt_changeProperty;@BindView(R.id.bt_set_text_on_mediator)Button mBt_temp;DataMediator<Student> mMediator;@Overrideprotected int getLayoutId() {return R.layout.ac_test_double_bind;}@Overrideprotected void onInit(Context context, Bundle savedInstanceState) {mBt_changeProperty.setText("click this to change property");mBt_temp.setVisibility(View.GONE);//为数据模型创建  中介者。mMediator = DataMediatorFactory.createDataMediator(Student.class);//添加属性callbackmMediator.addDataMediatorCallback(new DataMediatorCallback<Student>() {@Overridepublic void onPropertyValueChanged(Student data, Property prop, Object oldValue, Object newValue) {Logger.w("TestPropertyChangeActivity","onPropertyValueChanged","prop = "+ prop.getName() + " ,oldValue = " + oldValue + " ,newValue = " + newValue);mTv_desc.setText(String.valueOf(newValue));}});mMediator.getDataProxy().setName("heaven7");}@OnClick(R.id.bt_set_text_on_TextView)public void onClickSetTextOnTextView(View v){mMediator.getDataProxy().setName("time: " + System.currentTimeMillis());}}
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该demo 做了3件事情。创建数据中介者，添加属性回调。然后在点击事件中改变了数据的属性。 结果使得日志被打印出来。而且textView也被更新。

对模型实现的代码感兴趣?

模型实现代码大致是这样的。

public class Student_$Impl implements Student, Serializable, Parcelable, DataPools.Poolable {private static final long serialVersionUID =  1L;public static final Parcelable.Creator<Student_$Impl> CREATOR = new Parcelable.Creator<Student_$Impl>() {@Overridepublic Student_$Impl createFromParcel(Parcel in) {return new Student_$Impl(in);}@Overridepublic Student_$Impl[] newArray(int size) {return new Student_$Impl[size];}};private int age;private String name;private long id;protected Student_$Impl(Parcel in) {this.age = in.readInt();this.name = in.readString();this.id = in.readLong();}public Student_$Impl() {}@Overridepublic int describeContents() {return 0;}@Overridepublic void writeToParcel(Parcel dest, int flags) {dest.writeInt(this.age);dest.writeString(this.name);dest.writeLong(this.id);}@Overridepublic void recycle() {DataPools.recycle(this);}@Overridepublic void clearProperties() {this.id = 0;this.age = 0;this.name = null;}@Overridepublic String toString() {Objects.ToStringHelper helper = Objects.toStringHelper(this).add("age", String.valueOf(this.age)).add("name", String.valueOf(this.name)).add("id", String.valueOf(this.id));return helper.toString();}public int getAge() {return age;}public Student setAge(int age1) {this.age = age1;return this;}public String getName() {return name;}public Student setName(String name1) {this.name = name1;return this;}public long getId() {return id;}public Student setId(long id1) {this.id = id1;return this;}@Overridepublic boolean equals(Object o) {if (this == o) {return true;}if (!(o instanceof Student_$Impl)) {return false;}Student_$Impl that = (Student_$Impl) o;if (getAge() != that.getAge()) {return false;}if (getName() != null ? !getName().equals(that.getName()) : that.getName() != null) {return false;}if (getId() != that.getId()) {return false;}return true;}
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下一章

Data-mediator入门系列2-2

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