Android---45---使用AIDL Service传递复杂数据

该实例所传输的数据类型是自定义类型。

Android 要求调用远程Service的参数和返回值都需要实现Parcelable接口。

实现Parcelable接口相当于Android提供的一种自定义序列化机制。

实现Parcelable接口不仅要求实现该接口里定义的方法，而且要求在实现类中定义一个名为CREATOR
类型为Parcelable.Creator的静态Filed。除此之外，还要求使用AIDL代码来定义这些自定义类型。

服务端：

自定义两个类型：Person与Pet，其中Person对象作为调用远程Service的参数，而Pet将作为返回值。

Person 和 Pet类都必须实现 Parcelable接口，并在实现类中定义一个名为CREATOR的静态Filed。

要定义Person类，先要AIDL来定义Person类：

parcelable Person;

接下来定义Person实现Parcelable的类

public class Person implements Parcelable {

	private Integer id;
	private String name;
	private String pass;

	public Person() {
		super();
		// TODO Auto-generated constructor stub
	}

	public Person(Integer idInteger, String name, String pass) {
		super();
		this.id = idInteger;
		this.name = name;
		this.pass = pass;
	}

	public Integer getIdInteger() {
		return id;
	}

	public void setIdInteger(Integer idInteger) {
		this.id = idInteger;
	}

	public String getName() {
		return name;
	}

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

	public String getPass() {
		return pass;
	}

	public void setPass(String pass) {
		this.pass = pass;
	}

	@Override
	public int hashCode() {
		// TODO Auto-generated method stub
		final int prime = 31;
		int result = 1;
		result = prime * result + ((name == null) ? 0 : name.hashCode());
		result = prime * result + ((pass == null) ? 0 : pass.hashCode());
		return result;
	}

	@Override
	public boolean equals(Object o) {
		if (this == o) {
			return true;
		}
		if (o == null) {
			return false;
		}
		if (getClass() != o.getClass()) {
			return false;
		}
		Person other = (Person) o;
		if (name == null) {
			if (other.name != null) {
				return false;
			}
		} else if (!name.equals(other.name)) {
			return false;
		}

		if (pass == null) {
			if (other.pass != null) {
				return false;
			}
		} else if (!pass.equals(other.pass)) {
			return false;
		}
		return true;
	}

	// 实现Parcelable必须要实现的方法
	@Override
	public int describeContents() {
		return 0;
	}

	@Override
	public void writeToParcel(Parcel dest, int flags) {
		// 把该对象所包含的数据写到Parcel
		dest.writeInt(id);
		dest.writeString(name);
		dest.writeString(pass);
	}

	public static final Parcelable.Creator<Person> CREATOR = new Parcelable.Creator<Person>() {

		@Override
		public Person createFromParcel(Parcel source) {
			// 从Parcel中读取数据，返回Person对象
			return new Person(source.readInt(), source.readString(),
					source.readString());
		}

		@Override
		public Person[] newArray(int size) {
			// TODO Auto-generated method stub
			return new Person[size];
		}
	};

}

然后是Pet类，也是先定义AIDL中的Pet：

parcelable Pet; 

然后是定义Pet类实现Parcelable：

public class Pet implements Parcelable {
	private String name;
	private double weight;

	public Pet(String name, double weight) {
		super();
		this.name = name;
		this.weight = weight;
	}

	public Pet() {
		super();
		// TODO Auto-generated constructor stub
	}

	public String getName() {
		return name;
	}

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

	public double getWeight() {
		return weight;
	}

	public void setWeight(double weight) {
		this.weight = weight;
	}

	@Override
	public int describeContents() {
		// TODO Auto-generated method stub
		return 0;
	}

	@Override
	public String toString() {
		return "Pet [name=" + name + ", weight=" + weight + "]";
	}

	@Override
	public void writeToParcel(Parcel dest, int flags) {
		dest.writeString(name);
		dest.writeDouble(weight);
	}

	// 添加一个静态成员，名为CREATOR，该对象实现了Parcelable.Creator接口
	public static final Parcelable.Creator<Pet> CREATOR = new Parcelable.Creator<Pet>() {

		@Override
		public Pet createFromParcel(Parcel source) {
			// 从Parcel中读取数据，返回Pet对象
			return new Pet(source.readString(), source.readDouble());

		}

		@Override
		public Pet[] newArray(int size) {
			return new Pet[size];
		}
	};

}

有了Person和Pet自定义的类，接下来就要定义用于通信的接口了：IPet

还是先是AIDL中定义：

package com.example.complexaidlservice;
import com.example.complexaidlservice.Pet;
import com.example.complexaidlservice.Person;
//定义一个Person对象作为传入对象
interface IPet{

	List<Pet> getPets (in Person owner );
}

接下来就是开发Service类了：

public class ComplexService extends Service {

	private PetBinder petBinder;
	private static Map<Person, List<Pet>> pets = new HashMap<Person, List<Pet>>();

	static {
		ArrayList<Pet> list1 = new ArrayList<Pet>();
		list1.add(new Pet("旺财", 4.3));
		list1.add(new Pet("来福", 5.4));
		pets.put(new Person(1, "sun", "sun"), list1);

		ArrayList<Pet> list2 = new ArrayList<Pet>();
		list2.add(new Pet("Kitty", 2.3));
		list2.add(new Pet("garfiled", 3.1));
		pets.put(new Person(2, "bai", "bai"), list2);

	}

	@Override
	public void onCreate() {
		super.onCreate();
		petBinder = new PetBinder();
	}

	@Override
	public IBinder onBind(Intent intent) {
		// TODO Auto-generated method stub
		return petBinder;
	}

	// 继承Stub，也就是实现了IPet接口，并实现了IBinder接口
	public class PetBinder extends Stub {

		@Override
		public List<Pet> getPets(Person owner) throws RemoteException {
			// TODO Auto-generated method stub
			return pets.get(owner);
		}

	}

	@Override
	public void onDestroy() {
	}
}

接下来该写客户端的代码了：

还记得在上一篇中写到的，需要把服务端的AIDL接口复制过来，传递复杂数据的时候，不仅仅只将IPet复制过来
同时也要将 Person.java,Person.aidl Pet.aidl,Pet.java 一起复制到客户端。

还是按照之前绑定远程Service的方式即可，并在ServiceConnection实现类的onServiceConnected方法中
获取远程Service的onBind方法返回的代理对象即可。

public class ComplexClient extends Activity {
	private IPet petService;
	private Button get;
	EditText personView;
	ListView showView;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		personView = (EditText) findViewById(R.id.person);
		showView = (ListView) findViewById(R.id.show);
		get = (Button) findViewById(R.id.get);

		Intent intent = new Intent();
		intent.setAction("com.example.complexaidlservice.COMPLEXSERVICE");

		// 绑定远程Service
		bindService(intent, conn, Service.BIND_AUTO_CREATE);
		get.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {

				try {
					String personName = personView.getText().toString();
					// 调用远程Service的方法
					List<Pet> pets = petService.getPets(new Person(1,
							personName, personName));
					// 将程序返回的List包装成ArrayAdapterpter
					ArrayAdapter<Pet> adapter = new ArrayAdapter<>(
							ComplexClient.this,
							android.R.layout.simple_list_item_1, pets);
					
					showView.setAdapter(adapter);
					
				} catch (RemoteException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		});

	}
	@Override
	protected void onDestroy() {
		// TODO Auto-generated method stub
		super.onDestroy();
		this.unbindService(conn);
	}

	private ServiceConnection conn = new ServiceConnection() {

		@Override
		public void onServiceConnected(ComponentName name, IBinder service) {
			// 获取远程Service的onBind方法返回的对象的代理
			petService = IPet.Stub.asInterface(service);
		}

		@Override
		public void onServiceDisconnected(ComponentName name) {
			// TODO Auto-generated method stub
			petService = null;
		}

	};

}