gecko/mobile/android/base/GeckoAsyncTask.java

61 lines
2.1 KiB
Java

/* -*- Mode: Java; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: nil; -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.gecko.util;
import android.app.Activity;
import android.os.Handler;
// AsyncTask runs onPostExecute on the thread it is constructed on
// We construct these off of the main thread, and we want that to run
// on the main UI thread, so this is a convenience class to do that
public abstract class GeckoAsyncTask<Params, Progress, Result> {
public enum Priority { NORMAL, HIGH };
private final Activity mActivity;
private final Handler mBackgroundThreadHandler;
private Priority mPriority = Priority.NORMAL;
public GeckoAsyncTask(Activity activity, Handler backgroundThreadHandler) {
mActivity = activity;
mBackgroundThreadHandler = backgroundThreadHandler;
}
private final class BackgroundTaskRunnable implements Runnable {
private Params[] mParams;
public BackgroundTaskRunnable(Params... params) {
mParams = params;
}
public void run() {
final Result result = doInBackground(mParams);
mActivity.runOnUiThread(new Runnable() {
public void run() {
onPostExecute(result);
}
});
}
}
public final void execute(final Params... params) {
BackgroundTaskRunnable runnable = new BackgroundTaskRunnable(params);
if (mPriority == Priority.HIGH)
mBackgroundThreadHandler.postAtFrontOfQueue(runnable);
else
mBackgroundThreadHandler.post(runnable);
}
public final GeckoAsyncTask<Params, Progress, Result> setPriority(Priority priority) {
mPriority = priority;
return this;
}
/* Empty stub method. Implementors can optionally override this if they need it */
protected void onPostExecute(Result result) { }
protected abstract Result doInBackground(Params... params);
}