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Android Developer Fundamentals
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AsyncTaskAndroid Developer Fundamentals
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AsyncTask 11
Background Tasks
Lesson 7
1
Android Developer Fundamentals
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Android Developer Fundamentals
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AsyncTask
7.1 AsyncTask &
AsyncTaskLoader
2This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
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Android Developer Fundamentals
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AsyncTask
Contents
●Threads●AsyncTask●Loaders●AsyncTaskLoader
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Android Developer Fundamentals
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AsyncTask
Threads
4
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Android Developer Fundamentals
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AsyncTask
The main thread
●Independent path of execution in a running program
●Code is executed line by line●App runs on Java thread called "main" or "UI
thread"●Draws UI on the screen●Responds to user actions by handling UI events
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Android Developer Fundamentals
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AsyncTask
The Main thread must be fast
●Hardware updates screen every 16 milliseconds●UI thread has 16 ms to do all its work●If it takes too long, app stutters or hangs
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WAIT
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Android Developer Fundamentals
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AsyncTask
Users uninstall unresponsive apps
●If the UI waits too long for an operation to finish, it becomes unresponsive
●The framework shows an Application Not Responding (ANR) dialog
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Android Developer Fundamentals
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AsyncTask 8
What is a long running task?
●Network operations●Long calculations●Downloading/uploading files●Processing images●Loading data
What is a long running task?
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Android Developer Fundamentals
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AsyncTask
Background threads
Execute long running tasks on a background thread
●AsyncTask●The Loader Framework●Services
9
Main Thread (UI Thread)
Worker Thread Do some work
Update UI
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Android Developer Fundamentals
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AsyncTask
Two rules for Android threads
●Do not block the UI thread○Complete all work in less than 16 ms for each screen○Run slow non-UI work on a non-UI thread
●Do not access the Android UI toolkit from outside the UI thread
○Do UI work only on the UI thread
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Android Developer Fundamentals
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AsyncTask
AsyncTask
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Android Developer Fundamentals
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AsyncTask
What is AsyncTask?
Use AsyncTask to implement basic background tasks
12
Main Thread (UI Thread)
WorkerThread doInBackground()
onPostExecute()
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Android Developer Fundamentals
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AsyncTask
Override two methods
●doInBackground()—runs on a background thread○All the work to happen in the background
●onPostExecute()—runs on main thread when work done
○Process results○Publish results to the UI
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Android Developer Fundamentals
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AsyncTask
AsyncTask helper methods
●onPreExecute()○Runs on the main thread○Sets up the task
●onProgressUpdate()○Runs on the main thread○receives calls from publishProgress() from background
thread
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Android Developer Fundamentals
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AsyncTask
AsyncTask helper methods
15
Main Thread (UI Thread)
Worker Thread
doInBackground()
onPostExecute()
publishProgress()
onProgressUpdate()onPreExecute()
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Android Developer Fundamentals
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AsyncTask
Creating an AsyncTask
1.Subclass AsyncTask2.Provide data type sent to doInBackground()3.Provide data type of progress units for onProgressUpdate()
4.Provide data type of result for onPostExecute()
private class MyAsyncTask extends AsyncTask<URL, Integer, Bitmap> {...}
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Android Developer Fundamentals
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AsyncTask
MyAsyncTask class definition
private class MyAsyncTask extends AsyncTask<String, Integer, Bitmap> {...}
doInBackground()doInBackground(
●String—could be query, URI for filename●Integer—percentage completed, steps done●Bitmap—an image to be displayed
● Use Void if no data passed
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onPostExecute()
doInBackground()onProgressUpdate()
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Android Developer Fundamentals
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AsyncTask
onPreExecute()
protected void onPreExecute() { // display a progress bar // show a toast}
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Android Developer Fundamentals
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AsyncTask
doInBackground()
protected Bitmap doInBackground(String... query) { // Get the bitmap return bitmap;}
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Android Developer Fundamentals
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AsyncTask
onProgressUpdate()
protected void onProgressUpdate(Integer... progress) { setProgressPercent(progress[0]); }
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Android Developer Fundamentals
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AsyncTask
onPostExecute()
protected void onPostExecute(Bitmap result) {
// Do something with the bitmap
}
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Android Developer Fundamentals
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AsyncTask
Start background work
public void loadImage (View view) {
String query = mEditText.getText().toString();
new MyAsyncTask(query).execute();
}
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Android Developer Fundamentals
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AsyncTask 23
Limitations of AsyncTaskLimitations of AsyncTask
●When device configuration changes, Activity is destroyed
●AsyncTask cannot connect to Activity anymore●New AsyncTask created for every config change●Old AsyncTasks stay around●App may run out of memory or crash
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Android Developer Fundamentals
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AsyncTask
When to use AsyncTask●Short or interruptible tasks
● Tasks that do not need to report back to UI or user
●Lower priority tasks that can be left unfinished
●Use AsyncTaskLoader otherwise
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Android Developer Fundamentals
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AsyncTask
Loaders
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Android Developer Fundamentals
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AsyncTask
What is a Loader?
●Provides asynchronous loading of data●Reconnects to Activity after configuration
change●Can monitor changes in data source and deliver
new data●Callbacks implemented in Activity●Many types of loaders available
○AsyncTaskLoader, CursorLoader
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Android Developer Fundamentals
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AsyncTask
Why use loaders?
●Execute tasks OFF the UI thread●LoaderManager handles configuration changes for
you●Efficiently implemented by the framework●Users don't have to wait for data to load
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Android Developer Fundamentals
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AsyncTask
Anatomy of a Loader
●Manages loader functions via callbacks
●Can manage multiple loaders○loader for database data, for AsyncTask data, for internet data…
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What is a LoaderManager?
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Android Developer Fundamentals
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AsyncTask
Get a loader with initLoader()●Creates and starts a loader, or reuses an existing
one, including its data●Use restartLoader() to clear data in existing loader
getLoaderManager().initLoader(Id, args, callback);getLoaderManager().initLoader(0, null, this);
getSupportLoaderManager().initLoader(0, null, this);
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Android Developer Fundamentals
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AsyncTask
Implementing AsyncTaskLoa
der
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Android Developer Fundamentals
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AsyncTask
AsyncTaskLoader Overview
31
LoaderManager
AsyncTaskLoader AsyncTask WorkToDo
Request Work
Receive Result
Activity
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Android Developer Fundamentals
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AsyncTask
doInBackground() onPostExecute()
loadInBackground() onLoadFinished()
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AsyncTask AsyncTaskLoader
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Android Developer Fundamentals
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AsyncTask
Steps for AsyncTaskLoader subclass
1.Subclass AsyncTaskLoader 2.Implement constructor3.loadInBackground()4.onStartLoading()
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Android Developer Fundamentals
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AsyncTask
Subclass AsyncTaskLoader
public static class StringListLoader extends AsyncTaskLoader<List<String>> {
public StringListLoader(Context context, String queryString) { super(context); mQueryString = queryString;}}
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AsyncTask
loadInBackground()
public List<String> loadInBackground() {
List<String> data = new ArrayList<String>;
//TODO: Load the data from the network or from a database
return data;
}
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Android Developer Fundamentals
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AsyncTask
onStartLoading()
When restartLoader() or initLoader() is called, the LoaderManager invokes the onStartLoading() callback
●Check for cached data●Start observing the data source (if needed)●Call forceLoad() to load the data if there are
changes or no cached data protected void onStartLoading() { forceLoad(); }
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Android Developer Fundamentals
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AsyncTask
Implement loader callbacks in Activity
●onCreateLoader() — Create and return a new Loader for the given ID
●onLoadFinished() — Called when a previously created loader has finished its load
●onLoaderReset() — Called when a previously created loader is being reset making its data unavailable
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Android Developer Fundamentals
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AsyncTask
onCreateLoader()
@Overridepublic Loader<List<String>> onCreateLoader(int id, Bundle args) { return new StringListLoader(this,args.getString("queryString"));}
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Android Developer Fundamentals
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AsyncTask
onLoadFinished()
Results of loadInBackground() are passed to onLoadFinished() where you can display them
public void onLoadFinished(Loader<List<String>> loader, List<String> data) { mAdapter.setData(data);}
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Android Developer Fundamentals
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AsyncTask
onLoaderReset()
●Only called when loader is destroyed●Leave blank most of the time
@Override public void onLoaderReset(final LoaderList<String>> loader) { }
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Android Developer Fundamentals
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AsyncTask
Get a loader with initLoader()
●In Activity●Use support library to be compatible with more
devices
getSupportLoaderManager().initLoader(0, null, this);
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Android Developer Fundamentals
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AsyncTask
Learn more
●AsyncTask Reference●AsyncTaskLoader Reference●LoaderManager Reference●Processes and Threads Guide●Loaders Guide●UI Thread Performance:
Exceed the Android Speed Limit
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Android Developer Fundamentals
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AsyncTask
What's Next?
43
● Concept Chapter: 7.1 C AsyncTask and AsyncTaskLoader
● Practical: 7.1 P Create an AsyncTask
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Android Developer Fundamentals
END
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