什麼是AIDL
aidl的全稱是Android Interface Definition Language,這是爲了實現跨進程通信而在客戶端和服務端編寫的接口。
定義aidl文件
package com.geo.im.service;
import com.geo.bean.PersonalInfo;
import com.geo.bean.GRoomInfo;
interface CommunicationAIDL{
//登錄
boolean startLogin();
//註冊
boolean startRegister(String name,String paswd);
//添加朋友
boolean addFriend(String name,String nick);
//同意好友請求
boolean confirmFriendRequest(String username);
//刪除朋友
boolean deleteFriend();
//添加分組
boolean addGroup();
//退出
boolean exit();
//清除登錄狀態
void clearLoginState();
//發送消息
boolean sendMessage(String user,String content);
//獲取好友列表
List<PersonalInfo> getFriends();
//創建會議室
void createConferenceRoom(String roomName);
//加入會議室
void joinConferenceRoomChat(String username,String password,String roomname);
//查詢會議室成員名稱
void queryConferenceRoomUsers(String roomname);
//獲取服務器上所有會議室
List<GRoomInfo> getConferenceRooms();
}
在Service中創建Binder類
private class CommnuicationServer extends CommunicationAIDL.Stub {
@Override
public boolean startLogin() throws RemoteException {
// 開始登錄
mXppManager.startLoginTask();
return isLoginSucced;
}
@Override
public boolean startRegister(String name, String password)
throws RemoteException {
if (mXppManager.isConnected()) {
return mXppManager.getAccountGeoManager().register(name,
password);
}
// 註冊
return false;
}
@Override
public boolean addFriend(String user, String nick)
throws RemoteException {
// 添加朋友
return mXppManager.getAccountGeoManager().addFriends(user, nick,
null);
}
@Override
public boolean deleteFriend() throws RemoteException {
// 刪除朋友
return false;
}
@Override
public boolean addGroup() throws RemoteException {
// 添加分組
return false;
}
@Override
public boolean exit() throws RemoteException {
// 退出系統
return false;
}
...............................
}
在Service中創建那個CommunicationServer對象,並在onBinder()方法中返回。
創建ServerviceConnection對象並bindService
protected ServiceConnection mConnection = new ServiceConnection() {
public void onServiceConnected(ComponentName className, IBinder service) {
mServiceConnection = CommunicationAIDL.Stub.asInterface(service);
}
public void onServiceDisconnected(ComponentName className) {
mServiceConnection = null;
}
};
注意mServiceConnection是一個CommunicationAIDL的實例,通過此實例就可以操作定義在aidl中的各種方法了,也就是在Service中由CommnuicationServer實現的方法,從而達到與Service通信的目的。綁定Service如下:
Intent intent = new Intent();
intent.putExtra("data", "Hello AIDL");
intent = new Intent();
intent.setClass(mContext, ConnectionService.class);
mContext.bindService(intent, mConnection, 1);
需要注意的是,aidl文件中只能傳遞基本類型、String類型的數據,如果要傳遞自己定義的實例對象數據,則需要實現Parcelable接口並且在aidl文件中聲明,如下例子,一個PersonInfo類就實現了Parcelable接口:
public PersonalInfo(String ujid, String password, String username,
String extend, int online) {
this.ujid = ujid;
this.username = username;
this.password = password;
this.extend = extend;
this.online = online;
}
private PersonalInfo(Parcel in) {
this.ujid = in.readString();
this.username = in.readString();
this.password = in.readString();
this.extend = in.readString();
this.online = in.readInt();
}
public static final Parcelable.Creator<PersonalInfo> CREATOR = new Parcelable.Creator<PersonalInfo>() {
public PersonalInfo createFromParcel(Parcel in) {
return new PersonalInfo(in);
}
public PersonalInfo[] newArray(int size) {
return new PersonalInfo[size];
}
};
@Override
public void writeToParcel(Parcel out, int flags) {
out.writeString(ujid);
out.writeString(username);
out.writeString(password);
out.writeString(extend);
out.writeInt(online);
}
主要就是通過writeToParcel寫入,通過CREATOR讀取數據,然後定義完實體類後需要新建一個和實體類同名的aidl文件,比如上述實體類叫做PersonalInfo.java,那麼久需要在同包下建一個PersonalInfo.aidl文件,該文件內容如下:
package com.geo.bean;
parcelable PersonalInfo;
其實就是一個package和一個parcelable的申明,這樣就可以了,然後我們去服務的aidl中就可以傳遞此PersonalInfo實體類了,正如我們上面的CommunicationAIDL文件中的List<PersonalInfo> getFriends(); 方法,需要先import com.geo.bean.PersonalInfo;進來,如此即可。