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And the result should look like
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
android:versionCode="1" android:versionName="1.0"
package="com.marakana.android.fibonacciclient">
<uses-sdk android:minSdkVersion="8" />
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name="com.marakana.android.fibonacciclient.FibonacciActivity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
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Async Binder IPC (by Example)
Binder allows for the asynchronous communication between the client and its service via the 
oneway
oneway
declaration on the AIDL interface
Of course, we still care about the result, so generally async calls are used with call-backs - typically
through listeners
When clients provide a reference to themselves as call-back listeners, then the roles reverse at the time
the listeners are called: clients' listeners become the services, and services become the clients to those
listeners
This is best explained via an example (based on Fibonacci)
The code is available
As a ZIP archive: https://github.com/marakana/FibonacciAsyncBinderDemo/zipball/master
By Git: git clone 
git clone https://github.com/marakana/FibonacciAsyncBinderDemo.git
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FibonacciCommon
FibonacciCommon - Defining a oneway
y
oneway AIDL
Service
First, we need a listener, which itself is a 
oneway
oneway AIDL-defined "service":
FibonacciCommon/src/com/marakana/android/fibonaccicommon/IFibonacciServiceResponseListener.aidl
FibonacciCommon/src/com/marakana/android/fibonaccicommon/IFibonacciServiceResponseListener.aidl:
Now we can create a our 
oneway
oneway (i.e. asynchronous) interface:
FibonacciCommon/src/com/marakana/android/fibonaccicommon/IFibonacciService.aidl
FibonacciCommon/src/com/marakana/android/fibonaccicommon/IFibonacciService.aidl:
package com.marakana.android.fibonaccicommon;
import com.marakana.android.fibonaccicommon.FibonacciRequest;
import com.marakana.android.fibonaccicommon.FibonacciResponse;
oneway interface IFibonacciServiceResponseListener {
void onResponse(in FibonacciResponse response);
}
package com.marakana.android.fibonaccicommon;
import com.marakana.android.fibonaccicommon.FibonacciRequest;
import com.marakana.android.fibonaccicommon.FibonacciResponse;
import com.marakana.android.fibonaccicommon.IFibonacciServiceResponseListener;
oneway interface IFibonacciService {
void fib(in FibonacciRequest request, in IFibonacciServiceResponseListener listener);
}
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FibonacciService
FibonacciService - Implementing our async
AIDL service
The implementation of our service invokes the listener, as opposed to returning a result:
FibonacciService/src/com/marakana/android/fibonacciservice/IFibonacciServiceImpl.java
FibonacciService/src/com/marakana/android/fibonacciservice/IFibonacciServiceImpl.java:
The service will not block waiting for the listener to return, because the listener itself is also
oneway
oneway
.
package com.marakana.android.fibonacciservice;
import android.os.RemoteException;
import android.os.SystemClock;
import android.util.Log;
import com.marakana.android.fibonaccicommon.FibonacciRequest;
import com.marakana.android.fibonaccicommon.FibonacciResponse;
import com.marakana.android.fibonaccicommon.IFibonacciService;
import com.marakana.android.fibonaccicommon.IFibonacciServiceResponseListener;
import com.marakana.android.fibonaccinative.FibLib;
public class IFibonacciServiceImpl extends IFibonacciService.Stub {
private static final String TAG = "IFibonacciServiceImpl";
@Override
public void fib(FibonacciRequest request,
IFibonacciServiceResponseListener listener) throws RemoteException {
long n = request.getN();
Log.d(TAG, "fib(" + n + ")");
long timeInMillis = SystemClock.uptimeMillis();
long result;
switch (request.getType()) {
case ITERATIVE_JAVA:
result = FibLib.fibJI(n);
break;
case RECURSIVE_JAVA:
result = FibLib.fibJR(n);
break;
case ITERATIVE_NATIVE:
result = FibLib.fibNI(n);
break;
case RECURSIVE_NATIVE:
result = FibLib.fibNR(n);
break;
default:
result = 0;
}
timeInMillis = SystemClock.uptimeMillis() - timeInMillis;
Log.d(TAG, String.format("Got fib(%d) = %d in %d ms", n, result,
timeInMillis));
listener.onResponse(new FibonacciResponse(result, timeInMillis));
}
}
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FibonacciClient
FibonacciClient - Implementing our async
AIDL client
Finally, we implement our client, which itself has to also implement a listener as a Binder service:
FibonacciClient/src/com/marakana/android/fibonacciclient/FibonacciActivity.java
FibonacciClient/src/com/marakana/android/fibonacciclient/FibonacciActivity.java:
package com.marakana.android.fibonacciclient;
import android.app.Activity;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.os.RemoteException;
import android.os.SystemClock;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioGroup;
import android.widget.TextView;
import com.marakana.android.fibonaccicommon.FibonacciRequest;
import com.marakana.android.fibonaccicommon.FibonacciResponse;
import com.marakana.android.fibonaccicommon.IFibonacciService;
import com.marakana.android.fibonaccicommon.IFibonacciServiceResponseListener;
public class FibonacciActivity extends Activity implements OnClickListener,
ServiceConnection {
private static final String TAG = "FibonacciActivity";
// the id of a message to our response handler
private static final int RESPONSE_MESSAGE_ID = 1;
// the id of a progress dialog that we'll be creating
private static final int PROGRESS_DIALOG_ID = 1;
private EditText input; // our input n
private Button button; // trigger for fibonacci calcualtion
private RadioGroup type; // fibonacci implementation type
private TextView output; // destination for fibonacci result
private IFibonacciService service; // reference to our service
// the responsibility of the responseHandler is to take messages
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// from the responseListener (defined below) and display their content
// in the UI thread
private final Handler responseHandler = new Handler() {
@Override
public void handleMessage(Message message) {
switch (message.what) {
case RESPONSE_MESSAGE_ID:
Log.d(TAG, "Handling response");
FibonacciActivity.this.output.setText((String) message.obj);
FibonacciActivity.this.removeDialog(PROGRESS_DIALOG_ID);
break;
}
}
};
// the responsibility of the responseListener is to receive call-backs
// from the service when our FibonacciResponse is available
private final IFibonacciServiceResponseListener responseListener = new 
IFibonacciServiceResponseListener.Stub() {
// this method is executed on one of the pooled binder threads
@Override
public void onResponse(FibonacciResponse response)
throws RemoteException {
String result = String.format("%d in %d ms", response.getResult(),
response.getTimeInMillis());
Log.d(TAG, "Got response: " + result);
// since we cannot update the UI from a non-UI thread,
// we'll send the result to the responseHandler (defined above)
Message message = FibonacciActivity.this.responseHandler
.obtainMessage(RESPONSE_MESSAGE_ID, result);
FibonacciActivity.this.responseHandler.sendMessage(message);
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.setContentView(R.layout.main);
// connect to our UI elements
this.input = (EditText) super.findViewById(R.id.input);
this.button = (Button) super.findViewById(R.id.button);
this.type = (RadioGroup) super.findViewById(R.id.type);
this.output = (TextView) super.findViewById(R.id.output);
// request button click call-backs via onClick(View) method
this.button.setOnClickListener(this);
// the button will be enabled once we connect to the service
this.button.setEnabled(false);
}
@Override
protected void onStart() {
Log.d(TAG, "onStart()'ed");
super.onStart();
// Bind to our FibonacciService service, by looking it up by its name
// and passing ourselves as the ServiceConnection object
// We'll get the actual IFibonacciService via a callback to
// onServiceConnected() below
if (!super.bindService(new Intent(IFibonacciService.class.getName()),
this, BIND_AUTO_CREATE)) {
Log.w(TAG, "Failed to bind to service");
}
}
@Override
protected void onStop() {
Log.d(TAG, "onStop()'ed");
super.onStop();
// No need to keep the service bound (and alive) any longer than
// necessary
super.unbindService(this);
}
public void onServiceConnected(ComponentName name, IBinder service) {
Log.d(TAG, "onServiceConnected()'ed to " + name);
// finally we can get to our IFibonacciService
this.service = IFibonacciService.Stub.asInterface(service);
// enable the button, because the IFibonacciService is initialized
this.button.setEnabled(true);
}
public void onServiceDisconnected(ComponentName name) {
Log.d(TAG, "onServiceDisconnected()'ed to " + name);
// our IFibonacciService service is no longer connected
this.service = null;
// disabled the button, since we cannot use IFibonacciService
this.button.setEnabled(false);
}
@Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case PROGRESS_DIALOG_ID:
// this dialog will be opened in onClick(...) and
// dismissed/removed by responseHandler.handleMessage(...)
ProgressDialog dialog = new ProgressDialog(this);
dialog.setMessage(super.getText(R.string.progress_text));
dialog.setIndeterminate(true);
return dialog;
default:
return super.onCreateDialog(id);
}
}
// handle button clicks
public void onClick(View view) {
// parse n from input (or report errors)
final long n;
String s = this.input.getText().toString();
if (TextUtils.isEmpty(s)) {
return;
}
try {
n = Long.parseLong(s);
} catch (NumberFormatException e) {
this.input.setError(super.getText(R.string.input_error));
return;
}
// build the request object
final FibonacciRequest.Type type;
switch (FibonacciActivity.this.type.getCheckedRadioButtonId()) {
case R.id.type_fib_jr:
type = FibonacciRequest.Type.RECURSIVE_JAVA;
Our listener should not retain a strong reference to the activity (and it does since it’s an
anonymous inner class), but in this case we skip on the correctness for the sake of brevity.
break;
case R.id.type_fib_ji:
type = FibonacciRequest.Type.ITERATIVE_JAVA;
break;
case R.id.type_fib_nr:
type = FibonacciRequest.Type.RECURSIVE_NATIVE;
break;
case R.id.type_fib_ni:
type = FibonacciRequest.Type.ITERATIVE_NATIVE;
break;
default:
return;
}
final FibonacciRequest request = new FibonacciRequest(n, type);
try {
Log.d(TAG, "Submitting request...");
long time = SystemClock.uptimeMillis();
// submit the request; the response will come to responseListener
this.service.fib(request, this.responseListener);
time = SystemClock.uptimeMillis() - time;
Log.d(TAG, "Submited request in " + time + " ms");
// this dialog will be dismissed/removed by responseHandler
super.showDialog(PROGRESS_DIALOG_ID);
} catch (RemoteException e) {
Log.wtf(TAG, "Failed to communicate with the service", e);
}
}
}
Sharing Memory via Binder
Binder transactional data is copied among parties communicating - not ideal if we have a lot of data to
send
In fact, binder imposes limits on how much data we can send via transactions
If the data we want to share comes from a file, then we should just send the file descriptor instead
This is how we ask the media player to play an audio/video file for us - we just send it the FD
If the data we want to send is located in memory, rather than trying to send all of it at once, we could
send multiple but smaller chunks instead
Complicates our design
Alternatively, we could take advantage of Android’s ashmem
ashmem (Anonymous Shared Memory) facilities
Its Java wrapper 
android.os.MemoryFile
android.os.MemoryFile is not meant for memory sharing from 3rd party
apps
Drop to native (via JNI) and use ashmem directly?
Native memory sharing implemented via 
frameworks/base/libs/binder/Parcel.cpp
frameworks/base/libs/binder/Parcel.cpp's:
void Parcel::writeBlob(size_t len, WritableBlob* outBlob)
void Parcel::writeBlob(size_t len, WritableBlob* outBlob)
status_t Parcel::readBlob(size_t len, ReadableBlob* outBlob)
status_t Parcel::readBlob(size_t len, ReadableBlob* outBlob)
This is roughly implemented as follows:
Client
Service
size_t len = 4096;
int fd = ashmem_create_region("Parcel Blob", len);
ashmem_set_prot_region(fd, PROT_READ | PROT_WRITE);
void* ptr = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
ashmem_set_prot_region(fd, PROT_READ);
writeFileDescriptor(fd, true);
// write into  ptr for len as desired
munmap(ptr, len);
close(fd);
int fd = readFileDescriptor();
void* ptr = mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0);
// read from ptr up to len as desired
munmap(ptr, len);
Removed error handling for brevity. Also, 
writeFileDescriptor(…)
writeFileDescriptor(…)
and
readFileDescriptor(…)
readFileDescriptor(…)
are provided by 
libbinder
libbinder
.
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