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POReturning an AIDL interface implementation by reference across processes
 

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    <p>I have a little Android project going on which involves some IPC where client Activities bind to my service.<br/> I'm using AIDL for IPC and RPC which works pretty good, but I'm having trouble returning a service-side instantiated AIDL interface implementation to the clients:</p> <p>When the client is running in the same process as the service -- meaning running the service locally -- everything works just fine.<br/> But when client and service are seperated in different processes the method startLogSession, which is defined in ILogDroidBinder.aidl always returns null.<br/> The other method implemented in this interface -- getSessionIds -- which returns a List containing ints, always works (locally and cross-process).</p> <p>I'm taking a wild guess and suppose my ILogDroidSession implementation should also implement Parcelable, but that wouldn't work, because I can't parcel an object containg a reference to an SQLiteDatabase (or can I?).</p> <p>Here is the relevant code. I'd really be glad if someone could help me out here. Maybe I'm just missing a point somewhere, since this is my first Android project and I'm not quite involved yet.</p> <p>ILogDroidSession.aidl (An implementation of this is what I want to return to the client):</p> <pre class="lang-java prettyprint-override"><code>package net.sourceforge.projects.logdroid; interface ILogDroidSession { /** * Logs the given text to the error message channel of the current logging * session. * @param text Text to log. */ void logError(in String text); } </code></pre> <p>ILogDroidBinder.aidl (The IBinder interface passed to the client's onServiceConnected):</p> <pre class="lang-java prettyprint-override"><code>package net.sourceforge.projects.logdroid; import net.sourceforge.projects.logdroid.ILogDroidSession; interface ILogDroidBinder { /** * Starts a new LogDroid session which handles all logging events. * @param sessionName The name of the session. * @return An instance of ILogDroidSession. */ ILogDroidSession startLogSession(in String sessionName); /** * Gets a list with all available LogSession ids. */ List getSessionIds(); } </code></pre> <p>LogDroidService.java (Relevant code from my service):</p> <pre class="lang-java prettyprint-override"><code>public class LogDroidService extends Service { /** * The binder interface needed for Activities to bind to the * {@code LogDroidService}. */ private final ILogDroidBinder.Stub binder = new ILogDroidBinder.Stub() { /** * Starts a new LogDroidSession. */ public ILogDroidSession startLogSession(String sessionName) { return LogDroidService.this.createSession(sessionName); } /** * Gets all available session ids. */ public List&lt;Integer&gt; getSessionIds() { return LogDroidService.this.getSessionIds(); } }; /** * The database connection to be used for storing and retrieving log entries. */ private LogDroidDb database; @Override public void onCreate() { super.onCreate(); database = new LogDroidDb(getApplicationContext()); try { database.open(); // opens as writable database } catch ( SQLException ignorefornow ) { } } @Override public IBinder onBind(Intent ignore) { return binder; } /** * Creates a new LogDroidSession which will be returned to the user as a * AIDL remote object. * @param sessionName Name of the session. * @return A new instance of ILogDroidSession */ ILogDroidSession createSession(String sessionName) { LogDroidSession session = new LogDroidSession(database, sessionName); session.addLoggingOccurredListener(this); return session; } /** * Retrieves all session ids. * @return Array containing all LogDroidSession ids. */ ArrayList&lt;Integer&gt; getSessionIds() { return database.getSessionIds(); } } </code></pre> <p>MainActivity.java (Relevant client code):</p> <pre class="lang-java prettyprint-override"><code>public class MainActivity extends Activity { private ILogDroidSession session; private ILogDroidBinder binder; private ServiceConnection con = new ServiceConnection() { public void onServiceConnected(ComponentName arg0, IBinder arg1) { binder = ILogDroidBinder.Stub.asInterface(arg1); // always works try { // works locally but always returns null when cross-process session = binder.startLogSession("TestSession"); // always works List&lt;Integer&gt; ids = binder.getSessionIds(); } catch ( Exception ex) { // no exceptions are thrown either when running locally or cross-process Toast.makeText(getApplicationContext(), ex.getMessage(), Toast.LENGTH_LONG).show(); } } public void onServiceDisconnected(ComponentName arg0) { } }; } </code></pre>
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