StackOverflow2013

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copied!<p>A first attempt at an implementation of a intent service with priorities, based on CommonsWare's answer and Android's <code>IntentService</code> <a href="http://android.git.kernel.org/?p=platform/frameworks/base.git;a=blob;f=core/java/android/app/IntentService.java" rel="noreferrer">source code</a>. Will test extensively and edit accordingly.</p> <pre><code>public abstract class PriorityIntentService extends Service { private final class QueueItem implements Comparable<QueueItem> { Intent intent; int priority; int startId; @Override public int compareTo(QueueItem another) { if (this.priority < another.priority) { return -1; } else if (this.priority > another.priority) { return 1; } else { return (this.startId < another.startId) ? -1 : 1; } } } private final class ServiceHandler extends Handler { public ServiceHandler(Looper looper) { super(looper); } @Override public void handleMessage(Message msg) { try { final QueueItem item = mQueue.take(); onHandleIntent(item.intent); if (mQueue.isEmpty()) { PriorityIntentService.this.stopSelf(); } } catch (InterruptedException e) { e.printStackTrace(); } } } public static final String EXTRA_PRIORITY = "priority"; private String mName; private PriorityBlockingQueue<QueueItem> mQueue; private boolean mRedelivery; private volatile ServiceHandler mServiceHandler; private volatile Looper mServiceLooper; public PriorityIntentService(String name) { super(); mName = name; } @Override public IBinder onBind(Intent intent) { return null; } @Override public void onCreate() { super.onCreate(); HandlerThread thread = new HandlerThread("PriorityIntentService[" + mName + "]"); thread.start(); mServiceLooper = thread.getLooper(); mServiceHandler = new ServiceHandler(mServiceLooper); mQueue = new PriorityBlockingQueue<QueueItem>(); } @Override public void onDestroy() { mServiceLooper.quit(); } protected abstract void onHandleIntent(Intent intent); @Override public void onStart(Intent intent, int startId) { final QueueItem item = new QueueItem(); item.intent = intent; item.startId = startId; final int priority = intent.getIntExtra(EXTRA_PRIORITY, 0); item.priority = priority; mQueue.add(item); mServiceHandler.sendEmptyMessage(0); } @Override public int onStartCommand(Intent intent, int flags, int startId) { onStart(intent, startId); return mRedelivery ? START_REDELIVER_INTENT : START_NOT_STICKY; } public void setIntentRedelivery(boolean enabled) { mRedelivery = enabled; } } </code></pre>

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