I was having some problem when trying to use the equivalent of setTimeout() which is Runnable Thread in Android Java. So basically I have an Array called pathGeometries which store the data returned from API:
public void getDirection(Event eventModel, final Context context) {
String eventX = eventModel.getEventX();
String eventY = eventModel.getEventY();
final ArrayList<Geometry> pathGeometries = new ArrayList<Geometry>();
try {
HttpClient client = new DefaultHttpClient();
HttpGet request = new HttpGet(
"http://www.onemap.sg/API/services.svc/route/solve?token=qo/s2TnSUmfLz+32CvLC4RMVkzEFYjxqyti1KhByvEacEdMWBpCuSSQ+IFRT84QjGPBCuz/cBom8PfSm3GjEsGc8PkdEEOEr&routeStops=29741.9,40039.6;"
+ eventX + "," + eventY + "&routemode=CYCLE");
HttpResponse response = client.execute(request);
HttpEntity entity = response.getEntity();
//Code to extract and store to pathGeometries
} catch (JSONException e) {
e.printStackTrace();
}
} catch (IOException e) {
e.printStackTrace();
}
for (int iii = 0; iii < pathGeometries.size(); iii++) {
final int counter = iii;
final Handler h = new Handler();
h.postDelayed(new Runnable()
{
private long time = 0;
public void run()
{
time += 1000;
Log.d("TimerExample", "Going for... " + time);
h.postDelayed(this, 1000);
moveNext(pathGeometries.get(counter).getX(),
pathGeometries.get(counter).getY(), 0, context);
}
}, 1000);
}
}
And inside the for loop, I am looping each point in pathGeometries, set the point as center of the map by calling moveNext() and postDelayed it for 1 milliseconds before moving to the next record.
public static void moveNext(double coordx, double coordy, int k, Context context){
Point p = new Point(coordx, coordy);
EventMain.mMapView.zoomToResolution(p, 1);}
However, I am getting the error message as such:
01-17 16:30:41.547: E/AndroidRuntime(32490): FATAL EXCEPTION: AsyncTask #5
01-17 16:30:41.547: E/AndroidRuntime(32490): java.lang.RuntimeException: An error occured while executing doInBackground()
01-17 16:30:41.547: E/AndroidRuntime(32490): at android.os.AsyncTask$3.done(AsyncTask.java:278)
01-17 16:30:41.547: E/AndroidRuntime(32490): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
01-17 16:30:41.547: E/AndroidRuntime(32490): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
01-17 16:30:41.547: E/AndroidRuntime(32490): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
01-17 16:30:41.547: E/AndroidRuntime(32490): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
01-17 16:30:41.547: E/AndroidRuntime(32490): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
01-17 16:30:41.547: E/AndroidRuntime(32490): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
01-17 16:30:41.547: E/AndroidRuntime(32490): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
01-17 16:30:41.547: E/AndroidRuntime(32490): at java.lang.Thread.run(Thread.java:856)
01-17 16:30:41.547: E/AndroidRuntime(32490): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
01-17 16:30:41.547: E/AndroidRuntime(32490): at android.os.Handler.<init>(Handler.java:121)
01-17 16:30:41.547: E/AndroidRuntime(32490): at android.app.Activity.<init>(Activity.java:735)
01-17 16:30:41.547: E/AndroidRuntime(32490): at nyp.edu.eneighbourhood.directionRunnable.<init>(directionRunnable.java:15)
01-17 16:30:41.547: E/AndroidRuntime(32490): at Controller.EventController.getDirection(EventController.java:301)
01-17 16:30:41.547: E/AndroidRuntime(32490): at AsyncTask.GetEventDirectionAsyncTask.doInBackground(GetEventDirectionAsyncTask.java:34)
01-17 16:30:41.547: E/AndroidRuntime(32490): at AsyncTask.GetEventDirectionAsyncTask.doInBackground(GetEventDirectionAsyncTask.java:1)
01-17 16:30:41.547: E/AndroidRuntime(32490): at android.os.AsyncTask$2.call(AsyncTask.java:264)
01-17 16:30:41.547: E/AndroidRuntime(32490): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
01-17 16:30:41.547: E/AndroidRuntime(32490): ... 5 more
Any ideas how to fix this? Because I not sure if I am doing it correctly. Thanks in advance.
EDIT
In my UI Thread:
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
final Handler handler = new Handler();
}
btnGetDirection.setOnClickListener(new OnClickListener() {
String direction = "";
int counter = 1;
ArrayList<String> directionList = new ArrayList<String>();
public void onClick(View v) {
eventModel.setEventX(String.valueOf(eventModel.getEventX()));
eventModel.setEventY(String.valueOf(eventModel.getEventY()));
new GetEventDirectionAsyncTask(
new GetEventDirectionAsyncTask.OnRoutineFinished() {
public void onFinish() {
// Hide the callout and plot user location
// marker
// close the progress dialog
progressDialog.dismiss();
}
}, handler).execute(eventModel);
}
});
In the GetEventDirectionAsyncTask class:
public class GetEventDirectionAsyncTask extends AsyncTask<Event, Integer, Double> {
EventController eventCtrl = new EventController();
public static ArrayList<String> directionList = new ArrayList<String>();
Context context;
Handler handler;
public interface OnRoutineFinished { // interface
void onFinish();
}
private OnRoutineFinished mCallbacks;
public GetEventDirectionAsyncTask(OnRoutineFinished callback, Handler handler) { // constructor with
// interface
mCallbacks = callback;
this.handler = handler;
}
public GetEventDirectionAsyncTask() {
} // empty constructor to maintain compatibility
@Override
protected Double doInBackground(Event... params) {
if (params.length == 1) {
eventCtrl.getDirection(params[0], context);
directionList = eventCtrl.getDirectionPath(params[0], context);
}
return null;
}
protected void onPostExecute(Double result) {
if (mCallbacks != null)
mCallbacks.onFinish(); // call interface on finish
}
protected void onProgressUpdate(Integer... progress) {
}
}
In my Controller class getDirection method:
for (int iii = 0; iii < pathGeometries.size(); iii++) {
final int counter = iii;
final Handler h = new Handler();
h.postDelayed(new Runnable()
{
private long time = 0;
public void run()
{
time += 1000;
Log.d("TimerExample", "Going for... " + time);
h.postDelayed(this, 1000);
moveNext(pathGeometries.get(counter).getX(),
pathGeometries.get(counter).getY(), 0, context);
}
}, 1000);
RuntimeException: Can't create handler inside thread that has not...
Because you are trying to call moveNext from doInBackground Thread instead of UI Thread
To fix following error:
First Option: Declare Handler h at class level in Activity and initialize it in onCreate method or in any method which run on UI thread like onPreExecute()
`Handler handle;
public GetEventDirectionAsyncTask(OnRoutineFinished callback,
Handler handle){
this.handle=handle;
...
}`
pass hanlder from Activity as:
final Hanlder hanlder=new Hanlder();
btnGetDirection.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
GetEventDirectionAsyncTask obj= new GetEventDirectionAsyncTask(
new GetEventDirectionAsyncTask.OnRoutineFinished() {
public void onFinish() {
...
}
},hanlder).execute(eventModel);
}
});
Now use handle to call postDelayed from doInBackground
Second Option: Use runOnUiThread to create and call handler from UI Thread:
YourActivity.this.runOnUiThread(new Runnable() {
@Override
public void run() {
create and call postDelayed method from Handler here
}
});