【移動應(yīng)用開發(fā)技術(shù)】怎么在Android中實現(xiàn)跨進程回掉接口

【移動應(yīng)用開發(fā)技術(shù)】怎么在Android中實現(xiàn)跨進程回掉接口

這篇文章將為大家詳細講解有關(guān)怎么在Android中實現(xiàn)跨進程回掉接口，文章內(nèi)容質(zhì)量較高，因此在下分享給大家做個參考，希望大家閱讀完這篇文章后對相關(guān)知識有一定的了解。Android是一種基于Linux內(nèi)核的自由及開放源代碼的操作系統(tǒng)，主要使用于移動設(shè)備，如智能手機和平板電腦，由美國Google公司和開放手機聯(lián)盟領(lǐng)導(dǎo)及開發(fā)。首先定義兩個AIDL文件：1.ITestCallBack.aidlinterface

ITestCallBack

{

/**

*

Demonstrates

some

basic

types

that

you

can

use

as

parameters

*

and

return

values

in

AIDL.

*/

void

onTagValid(in

String

tag);

}2.ITestInterface.aidl

在注冊和反祖冊方法中，需要傳入ITestCallBack的對象interface

ITestInterface

{

/**

*

Demonstrates

some

basic

types

that

you

can

use

as

parameters

*

and

return

values

in

AIDL.

*/

boolean

isTagValid(in

String

tag);

void

registerCallback(in

String

tag,

in

ITestCallBack

callback);

void

unRegisterCallback(in

String

tag,

in

ITestCallBack

callback);

}服務(wù)端：

創(chuàng)建Service，并且在service中定義RemoteCallbackList集合，實現(xiàn)ITestInterface.Stub，在registerCallback,和unRegisterCallback中，分別將ITestCallBack對象注冊和反注冊進RemoteCallbackList中。RemoteCallbackList提供了獲取注冊進去的IInterface對象方法//其實RemoteCallbackList類似于java中{@link

java.util.Observable}，用來批量處理接口回調(diào)對象，

//其實如果確保只有一個客戶端會bind到這個服務(wù)，只需要保存一個IMyAidlInterfaceCallback即可。

//但是如果有多個，強烈推薦使用其實RemoteCallbackList

public

void

callBack()

{

if

(mCallBacks

==

null)

{

return;

}

int

num

=

mCallBacks.beginBroadcast();

for

(int

i

=

0;

i

<

num;

i++)

{

try

{

mCallBacks.getBroadcastItem(i).onTagValid("congratulation

callback

success

"

+

tag);

}

catch

(RemoteException

e)

{

e.printStackTrace();

}

}

//結(jié)束后一定要使用finsh，否則下次執(zhí)行beginBroadcast會拋出IllegalStateException異常

mCallBacks.finishBroadcast();

}在isTagValid中可以調(diào)用callBack方法去遍歷注冊的接口對象，也可以當服務(wù)端有變化時主動調(diào)用callBack方法去通知客戶端，這樣就實現(xiàn)了服務(wù)端變化主動通知客戶端。可根據(jù)實際方法修改。在service的onBind方法中，返回ITestInterface.Stub的對象即可，等待客戶端綁定服務(wù)端。下面是服務(wù)端Service的代碼：public

class

TestService

extends

Service

{

private

RemoteCallbackList<ITestCallBack>

mCallBacks

=

new

RemoteCallbackList<>();

private

String

tag

=

"hy";

public

TestService()

{

}

@Override

public

IBinder

onBind(Intent

intent)

{

//

TODO:

Return

the

communication

channel

to

the

service.

return

iTestInterface;

}

@Override

public

boolean

onUnbind(Intent

intent)

{

return

super.onUnbind(intent);

}

ITestInterface.Stub

iTestInterface

=

new

ITestInterface.Stub()

{

@Override

public

boolean

isTagValid(String

tag)

throws

RemoteException

{

if

(tag.equals(TestService.this.tag))

{

callBack();

return

true;

}

return

false;

}

@Override

public

void

registerCallback(String

tag,

ITestCallBack

callback)

throws

RemoteException

{

if

(null

!=

mCallBacks

&&

null

!=

callback)

{

mCallBacks.register(callback);

}

}

@Override

public

void

unRegisterCallback(String

tag,

ITestCallBack

callback)

throws

RemoteException

{

if

(null

!=

mCallBacks

&&

null

!=

callback)

{

mCallBacks.unregister(callback);

}

}

};

public

void

callBack()

{

if

(mCallBacks

==

null)

{

return;

}

int

num

=

mCallBacks.beginBroadcast();

for

(int

i

=

0;

i

<

num;

i++)

{

try

{

mCallBacks.getBroadcastItem(i).onTagValid("congratulation

callback

success

"

+

tag);

}

catch

(RemoteException

e)

{

e.printStackTrace();

}

}

mCallBacks.finishBroadcast();

}

}客戶端：

客戶端首先要做的是綁定服務(wù)端，實現(xiàn)AIDL的通信，在客戶端創(chuàng)建綁定按鈕，解綁按鈕，和主動獲取信息的通信按鈕。在主動獲取信息的通信按鈕中實現(xiàn)iTestInterface對象的isTagValid方法可以主動去獲取服務(wù)端的信息（服務(wù)端在isTagValid方法中調(diào)用了callBack方法）?？蛻舳舜a：public

class

MainActivity

extends

AppCompatActivity

{

private

String

tag

=

"hy";

private

ITestInterface

iTestInterface;

private

ServiceConnection

connection

=

new

ServiceConnection()

{

@Override

public

void

onServiceConnected(ComponentName

name,

IBinder

service)

{

iTestInterface

=

ITestInterface.Stub.asInterface(service);

}

@Override

public

void

onServiceDisconnected(ComponentName

name)

{

iTestInterface

=

null;

}

};

@Override

protected

void

onCreate(Bundle

savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

bindService();

((Button)

findViewById(R.id.buttonregister)).setOnClickListener(new

View.OnClickListener()

{

@Override

public

void

onClick(View

v)

{

try

{

iTestInterface.registerCallback(tag,

new

ITestCallBack.Stub()

{

@Override

public

void

onTagValid(String

tag)

throws

RemoteException

{

Log.e("test",

"registerCallback:

"

+

tag);

}

});

}

catch

(RemoteException

e)

{

e.printStackTrace();

}

}

});

((Button)

findViewById(R.id.buttonunregister)).setOnClickListener(new

View.OnClickListener()

{

@Override

public

void

onClick(View

v)

{

try

{

iTestInterface.unRegisterCallback(tag,

new

ITestCallBack.Stub()

{

@Override

public

void

onTagValid(String

tag)

throws

RemoteException

{

}

});

}

catch

(RemoteException

e)

{

e.printStackTrace();

}

}

});

((Button)

findViewById(R.id.buttonisvalid)).setOnClickListener(new

View.OnClickListener()

{

@Override

public

void

onClick(View

v)

{

try

{

iTestInterface.isTagValid(tag);

}

catch

(RemoteException

e)

{

e.printStackTrace();

}

}

});

}

private

void

bindService()

{

Intent

intent

=

new

Intent();

intent.setAction("com.example.heyang.myapplication.TestService");

intent.setPackage("com.example.heyang.myapplication");

boolean

success

=

bindService(intent,

connection,

Context.BIND_AUTO_CREATE);

if

(success)

{

Log.e("test

",

"bindService

OK");

}

else

{

Log.e("test

",

"bindService

Fail");

}

}

@Override

pr