首页 > 应用开发 > IT综合 > Andriod教程 AIDL的使用
Andriod开发中了解AIDL的使用是很重要的,这是andriod开发中必备的一个技能。全称为“Android Interface Definition Language”,它是一种IDL 语言,用来生成可以在Android设备上两个进程之间进行进程间通信的代码。若在一个进程中(比如说Activity),想调用另外一个进程中(例如Service)对象的操作,便能使用AIDL生成可序列化的参数。下面简单介绍一下AIDL使用的方法:
1.新建IRemoteService.aidl
[java] view plaincopyprint?
1. package com.tang.remoteservicedemo;
2. interface IRemoteService {
3. String getInfo();
4. }
package com.tang.remoteservicedemo;
interface IRemoteService {
String getInfo();
}
从内容中也可以看出,这东西类似一个接口。既然定义了这么一个玩意,那么我们就要去实现它。
2.新建IService“实现”IRemoteService“接口”
[java] view plaincopyprint?
1. package com.tang.remoteservicedemo;
2.
3. import java.util.Date;
4.
5. import android.app.Service;
6. import android.content.Intent;
7. import android.os.IBinder;
8. import android.os.RemoteException;
9.
10. public class IService extends Service
11. {
12. private IBinder iBinder = new IRemoteService.Stub() {
13. @Override
14. public String getInfo() throws RemoteException {
15. // TODO Auto-generated method stub
16. return new Date(System.currentTimeMillis()).toLocaleString()+" 来自远程服务的信息!";
17. }
18. };
19. @Override
20. public IBinder onBind(Intent intent) {
21. // TODO Auto-generated method stub
22. return iBinder;
23. }
24. }
package com.tang.remoteservicedemo;
import java.util.Date;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.os.RemoteException;
public class IService extends Service
{
private IBinder iBinder = new IRemoteService.Stub() {
@Override
public String getInfo() throws RemoteException {
// TODO Auto-generated method stub
return new Date(System.currentTimeMillis()).toLocaleString()+" 来自远程服务的信息!";
}
};
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return iBinder;
}
}
基于Binder的不同进程间通信,Client与Service在不同的进程中,对用户程序而言当调用Service返回的IBinder接口后,访问Service中的方法就如同调用自己的函数一样。
3.配置IService供其他进程调用
[java] view plaincopyprint?
1.
2. android:process=":remote">
3.
4.
5.
6.
android:process=":remote">
配置一个所属进程名和一个action。
通过前面三个步骤,这个含有getInfo()方法的service就可以给别人调用了,下面在客户端调用它
4.新建一个ClientDemo工程将含有IRemoteService.aidl的那个包全部拷贝到src下,只留下aidl文件,其他全删除。
5.新建MainActivity,其他就是绑定service的操作了
[java] view plaincopyprint?
1. package com.tang.clientdemo;
2.
3. import java.util.Timer;
4. import java.util.TimerTask;
5.
6. import com.tang.remoteservicedemo.IRemoteService;
7.
8. import android.app.Activity;
9. import android.content.ComponentName;
10. import android.content.Context;
11. import android.content.Intent;
12. import android.content.ServiceConnection;
13. import android.os.Bundle;
14. import android.os.IBinder;
15. import android.os.RemoteException;
16. import android.util.Log;
17.
18.
19. public class MainActivity extends Activity {
20.
21. private IRemoteService iService = null;
22. private boolean isBinded =false;
23.
24. ServiceConnection conn = new ServiceConnection() {
25.
26. @Override
27. public void onServiceDisconnected(ComponentName name) {
28. // TODO Auto-generated method stub
29. isBinded = false;
30. iService = null;
31. }
32.
33. @Override
34. public void onServiceConnected(ComponentName name, IBinder service) {
35. // TODO Auto-generated method stub
36. iService = IRemoteService.Stub.asInterface(service);
37. isBinded = true;
38. }
39. };
40.
41. public void doBind()
42. {
43. Intent intent = new Intent("com.tang.remoteservicedemo.IService");
44. bindService(intent, conn, Context.BIND_AUTO_CREATE);
45. }
46.
47. public void doUnbind()
48. {
49. if (isBinded)
50. {
51. unbindService(conn);
52. iService = null;
53. isBinded = false;
54. }
55. }
56. @Override
57. protected void onCreate(Bundle savedInstanceState) {
58. super.onCreate(savedInstanceState);
59. setContentView(R.layout.activity_main);
60. new Thread(new Runnable() {
61. @Override
62. public void run() {
63. // TODO Auto-generated method stub
64. doBind();
65. }
66. }).start();
67. Timer timer = new Timer();
68. timer.schedule(task, 0, 2000);
69.
70. }
71. TimerTask task = new TimerTask() {
72. @Override
73. public void run() {
74. // TODO Auto-generated method stub
75. if(iService!=null)
76. {
77. try {
78. Log.i("AAA", iService.getInfo());
79. } catch (RemoteException e) {
80. // TODO Auto-generated catch block
81. e.printStackTrace();
82. }
83. }
84. else
85. {
86. Log.i("AAA", "iService!=null");
87. }
88.
89. }
90. };
91.
92. @Override
93. protected void onDestroy() {
94. // TODO Auto-generated method stub
95. doUnbind();
96. task.cancel();
97. super.onDestroy();
98. }
99. }
package com.tang.clientdemo;
import java.util.Timer;
import java.util.TimerTask;
import com.tang.remoteservicedemo.IRemoteService;
import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.os.RemoteException;
import android.util.Log;
public class MainActivity extends Activity {
private IRemoteService iService = null;
private boolean isBinded =false;
ServiceConnection conn = new ServiceConnection() {
@Override
public void onServiceDisconnected(ComponentName name) {
// TODO Auto-generated method stub
isBinded = false;
iService = null;
}
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
// TODO Auto-generated method stub
iService = IRemoteService.Stub.asInterface(service);
isBinded = true;
}
};
public void doBind()
{
Intent intent = new Intent("com.tang.remoteservicedemo.IService");
bindService(intent, conn, Context.BIND_AUTO_CREATE);
}
public void doUnbind()
{
if (isBinded)
{
unbindService(conn);
iService = null;
isBinded = false;
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new Thread(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
doBind();
}
}).start();
Timer timer = new Timer();
timer.schedule(task, 0, 2000);
}
TimerTask task = new TimerTask() {
@Override
public void run() {
// TODO Auto-generated method stub
if(iService!=null)
{
try {
Log.i("AAA", iService.getInfo());
} catch (RemoteException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
else
{
Log.i("AAA", "iService!=null");
}
}
};
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
doUnbind();
task.cancel();
super.onDestroy();
}
}
执行之后的有一个为空的Log呢,到底是为什么呢?这是因为绑定也是要时间的哈...
以上就是简单的AIDL的介绍
本文来自麦子学院:http://www.maiziedu.com/
来自 “ ITPUB博客 ” ,链接:https://blog.itpub.net/30037762/viewspace-1371906/ ,如需转载,请注明出处,否则将追究法律责任。