aidl通過回調共享數據

AIDL傳入回調方法

假設現有一個service在接收數據，接收的數據要傳給另一個應用的activity使用，可以通過在activity中調用service的aidl的binder接口獲取到遠程service接口，然后通過該接口提供的設置數據接收回調的方法設置回調對象，從而實現遠程service接收數據后，由activity提供的回調對象將數據傳遞給到activity中（這樣做的原因是：aidl是共享內存的，數據共享速度是實時的(wrong),activity傳到服務端的listener對象，在到達服務端時，服務端會產生一個新的對象，這2個對象的共同點是：底層Binder是同一個。由于對象是不能跨進程直接傳輸的，對象的跨進程傳輸本質都是反序列化的過程）。

//設置回調對象的aidl

package com.test.aidl;

import com.test.aidl.InterProcessCallback;

interface IAIDLSetCallback

{

void setCallback(InterProcessCallback callback);

}

//回調接口aidl,因為InterProcessCallback在activity和service中都要使用，所以必須定義出aidl

package com.test.aidl;

interface InterProcessCallback

{

void recv(int val);

}

//service

public class AIDLService extends Service {

//回調對象實例

private InterProcessCallback callback;

//模擬service接收數據

private Random random;

@Override

public void onCreate() {

super.onCreate();

random = new Random(System.currentTimeMillis());

new Timer().schedule(new TimerTask() {

@Override

public void run() {

//如果activity已經傳入回調對象，則獲取數據傳給activity.

if(callback != null)

{

try {

callback.testCallback(random.nextInt());

} catch (RemoteException e) {

e.printStackTrace();

}

}

}

},0,10);

}

private IAIDLSetCallback.Stub binder = new IAIDLSetCallback.Stub()

{

@Override

public void setCallback(InterProcessCallback callback)

throws RemoteException {

AIDLService.this.callback = callback;

}

};

@Override

public IBinder onBind(Intent intent) {

return binder;

}

}

//activity

public class MainActivity extends Activity {

private TextView tvRecvValue;

private IAIDLSetCallback aidlService;

private InterProcessCallback interProcessCallback = new InterProcessCallback.Stub() {

@Override

public void recv(int val) throws RemoteException {

final int nVal = val;

MainActivity.this.runOnUiThread(new Runnable() {

@Override

public void run() {

tvRecvValue.setText(nVal+"");

}

});

}

};

private ServiceConnection conn = new ServiceConnection() {

@Override

public void onServiceConnected(ComponentName name, IBinder service)

{

aidlService =  AidlGetServiceData.Stub.asInterface(service);

try {

//設置回調對象

aidlService.setCallback(interProcessCallback);

} catch (RemoteException e) {

e.printStackTrace();

}

}

@Override

public void onServiceDisconnected(ComponentName name)

{

aidlService = null;

}

};

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

tvRecvValue = (TextView)findViewById(R.id.tvRecvValue);

Intent intent = new Intent("com.example.aidl.action.AIDL_TEST");

intent.setPackage("com.example.aidl_service");

bindService(intent, conn, Service.BIND_AUTO_CREATE);

}

@Override

protected void onDestroy() {

super.onDestroy();

this.unbindService(conn);

}

}

通過以上操作，就可以實現在service中接收數據，然后通過回調對象InterProcessCallback將數據回調給activity，從而完成遠程service和activity的數據共享。