我想运行我的异步任务，它以一定的准确度获取共同的声音，并在它获得坐标时激发不同的活动。
现在我想设置一个时间，这样如果它没有得到设定精度的坐标，那么Async任务应该自行销毁（删除位置更新等）并且传递Lattitude / Longitude的默认值
我试过用这个：
new GetGPShotfix().execute().get(1, TimeUnit.MINUTES);以便为此异步设置超时，然后继续执行此异步执行调用下面的下一行/任务。
但在我的情况下，它会跳过下一行而不等待Async设置的超时。
如何让它按照我想要的方式执行？我也尝试使用线程的join()但显然结果是相同的：（
更新： 这是我的代码（对于gpshotfix（）Async）：
private class GetGPShotfix extends AsyncTask<Void, Void, Void> {
// ProgressDialog progressDialogGPS;
@Override
protected void onPreExecute() {
super.onPreExecute();
Log.i("GPSfixer", "Ready to get GPS Hotfix");
}
@Override
protected Void doInBackground(Void... params) {
try {
LocationRetriever myLoc = new LocationRetriever();
// myLoc.getUserLoc();
//if (gotLoc == 0 && (firstLoc.getAccuracy() > 10)) {
if (gotLoc == 0) {
myLoc.getUserLoc();
}
} catch (Exception e) {
Log.i("GPSfixer", "GPS Hotfix Failed!", e);
}
finally {
Log.i("GPSfixer", "Get GPS Hotfix Completed...");
}
return null;
}
@Override
protected void onCancelled() {
Log.i("GPSfixer", "Get GPS Hotfix Cancelled");
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
Log.i("GPSfixer", "GPS Hotfix cycle completed");
System.out.println("Lon :" + myCurrentLon + "Lon2: " + finalLonNow);
System.out.println("Lat :" + myCurrentLat + "Lat2: " + finalLatNow);
//pDialog2.dismiss();
// progressDialogGPS.dismiss();
}
}
public class LocationRetriever {
final LocationManager locationManager = (LocationManager) StoreSelection.this.getSystemService(Context.LOCATION_SERVICE);
final LocationListener locationListener = new LocationListener() {
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(),
provider + " is disabled!", Toast.LENGTH_SHORT).show();
Toast.makeText(getApplicationContext(),
"Please standby..enabling " + provider,
Toast.LENGTH_SHORT).show();
// explicitly enable GPS
Intent enableGPS = new Intent("android.location.GPS_ENABLED_CHANGE");
enableGPS.putExtra("enabled", true);
sendBroadcast(enableGPS);
// explictly disable GPS
/*
* Intent intent = new
* Intent("android.location.GPS_ENABLED_CHANGE");
* intent.putExtra("enabled", false); sendBroadcast(intent);
*/
}
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(),
provider + " is enabled..", Toast.LENGTH_SHORT).show();
}
public void onStatusChanged(String provider, int status,
Bundle extras) {
// TODO Auto-generated method stub
/*
* System.out.println("val of status: " + status + " provider: "
* + provider);
*/
if (status == 1) {
Toast.makeText(getApplicationContext(),
provider + " is enabled & available..",
Toast.LENGTH_SHORT).show();
System.out.println(provider + " is NOT available!");
} else {
System.out.println(provider + " is NOT available!");
}
/* progressDialogGPS.dismiss(); */
}
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
// ORIG CODE --BELOW--
// moved lat/lon vars to top ^
myCurrentLon = location.getLongitude();
myCurrentLat = location.getLatitude();
firstLoc = location;
myCurrentLon = Double.parseDouble(new DecimalFormat("##.#########")
.format(myCurrentLon));
myCurrentLat = Double.parseDouble(new DecimalFormat("##.#########")
.format(myCurrentLat));
/*Toast.makeText(getApplicationContext(),
myCurrentLat + " " + myCurrentLon, Toast.LENGTH_SHORT)
.show();*/
System.out.println(myCurrentLat + " " + myCurrentLon);
float acc=location.getAccuracy();
/*Toast.makeText(getApplicationContext(), "Acc.: " + acc,Toast.LENGTH_SHORT).show();*/
// --
// get best out of 2 locs. --BEGINS--
/*
* makeUseOfNewLocation(location);
*
* if(currentBestLocation == null){ currentBestLocation =
* location; }
*/
if (myCurrentLon != null && myCurrentLat != null && (firstLoc.getAccuracy() <= 10)) { // added
// chk
// for
// online..
gotLoc = 1;
System.out.println("OK GOTLOC == 1 !");
System.out.println("Got your Current Location..disabling GPS to save Battery Power..");
Toast.makeText(getApplicationContext(), "Got your Current Location..disabling GPS to save Battery Power..", Toast.LENGTH_SHORT).show();
// removing updates
// locationManager.removeUpdates(locationListener);
// explicitly turning off GPS
Intent intent = new Intent("android.location.GPS_ENABLED_CHANGE");
intent.putExtra("enabled", false);
sendBroadcast(intent);
System.out.println("GPS disabled!");
finalLatNow = myCurrentLat;
finalLonNow = myCurrentLon;
//
// if(gotLoc == 0){
if (myCurrentLon != null
&& myCurrentLat != null && (firstLoc.getAccuracy() <= 10)) {
// locationManager.removeUpdates(locationListener);
gotLoc = 1;
Intent i = new Intent(StoreSelection.this, LastVisitDetails.class);
i.putExtra("currUsrLon", myCurrentLon); // 2nd
i.putExtra("currUsrLat", myCurrentLat); // 1st
i.putExtra("storeID", selStoreID);
i.putExtra("selStoreName", selStoreName);
i.putExtra("imei", uuid);
i.putExtra("date", userDate);
runOnUiThread(new Runnable() {
public void run() {
try {
// stuff here
pDialog2.dismiss();
} catch (Exception e) {
e.printStackTrace();
}
}
});
System.out.println("--Removing Loc. Updates--");
remUpdates();
syncTIMESTAMP = System.currentTimeMillis();
Date dateobj = new Date(syncTIMESTAMP);
SimpleDateFormat df = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss");
fullFileName1 = df.format(dateobj);
dbengine.open();
dbengine.UpdateStoreStartVisit(selStoreID, fullFileName1);
dbengine.close();
startActivity(i);
finish();
} else {
if (myCurrentLon == null && myCurrentLat == null) {
// alert + GPS not locking on..do something()
} else {
}
/*if (!isOnline()) {
// alert + not online...do something()
showNoConnAlert();
} else {
}*/
}
//
/*
* } else{}
*/
} else {
System.out.println("INSIDE ELSE -- GOTLOC");
}
}
};
// locationManager.requestLocationUpdates(locationManager.getBestProvider(new
// Criteria(), true), 2000, 4, locationListener);
// enable gps everytime we request location update
/*
* Intent enableGPS = new Intent("android.location.GPS_ENABLED_CHANGE");
* enableGPS.putExtra("enabled", true); sendBroadcast(enableGPS);
*/
// ** ORIG Grequest location updates from GPS string
/*
* locationManager.requestLocationUpdates(locationManager.GPS_PROVIDER,
* ONE_MIN, 4, locationListener);
*/
// ** now remove updating of co-ordinates
// locationManager.removeUpdates(locationListener);
/*public Location getBestLoc(){
if(firstLoc.getAccuracy() <= newLoc.getAccuracy() && newLoc.getAccuracy() <= 10) {
return firstLoc;
}
else if(newLoc.getAccuracy() <= firstLoc.getAccuracy() && newLoc.getAccuracy() <= 10){
return newLoc;
}
else {
return newLoc;
}
}*/
void getUserLoc() {
if (gotLoc == 1 && (firstLoc.getAccuracy() <= 10)) {
locationManager.removeUpdates(locationListener);
} else {
}
final Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
criteria.setHorizontalAccuracy(Criteria.ACCURACY_FINE);
// criteria.setVerticalAccuracy(Criteria.NO_REQUIREMENT);
criteria.setAltitudeRequired(false);
// criteria.setBearingAccuracy(Criteria.NO_REQUIREMENT);
criteria.setBearingRequired(false);
criteria.setCostAllowed(true);
criteria.setPowerRequirement(Criteria.POWER_HIGH);
runOnUiThread(new Runnable() {
public void run() {
try {
// stuff here
/*
* progressDialogGPS = ProgressDialog.show(_activity,
* null, null);
* progressDialogGPS.setContentView(R.layout.loader);
* progressDialogGPS
* .getWindow().setType(WindowManager.LayoutParams
* .TYPE_KEYGUARD_DIALOG);
*/
/*locationManager
.requestLocationUpdates(locationManager
.getBestProvider(criteria, true),
TEN_SECS, 4, locationListener);*/
locationManager.requestLocationUpdates(locationManager.GPS_PROVIDER, 0l, 0.0f, locationListener);
// remove updates #
if (gotLoc == 1 && (firstLoc.getAccuracy() <= 10)) {
locationManager.removeUpdates(locationListener);
} else {
}
} catch (Exception e) {
e.printStackTrace();
}
}
});
/*
* try { Thread.currentThread().sleep(2000); } catch
* (InterruptedException e) { // TODO Auto-generated catch block
* e.printStackTrace(); }
*/
}
void remUpdates() {
//if(firstLoc.getAccuracy() <= 10){
locationManager.removeUpdates(locationListener);
//}
//else {}
}
}
任何帮助都很明显......
答案 0 :(得分：6)
使用execute.get（1，TimeUnit.MINUTES）时，它会将异步任务转换为synchronus。在这种情况下，使用异步任务是没有用的。您可以在启动asynctask时启动单独的线程以保持监视时间并在此之后执行所需的操作。你可以创建一个implmenting runnable类，并将asyctask作为构造函数参数传递并在里面取消它。
class checkAyscTask implements Runnable {
AsyncTask<Void, Void, Boolean> mAT;
Context context;
public checkAyscTask(AsyncTask<Void, Void, Boolean> at) {
mAT = at;
}
@Override
public void run() {
mHandler.postDelayed(runnable, 60000);
// After 60sec the task in run() of runnable will be done
}
Handler mHandler = new Handler();
Runnable runnable = new Runnable() {
@Override
public void run() {
if (mAT.getStatus() == Status.RUNNING || mAT.getStatus() == Status.PENDING) {
mAT.cancel(true); //Cancel Async task or do the operation you want after 1 minute
}
}
};
}
task_GetGPS = new GetGPShotfix();
task_GetGPS.execute();
checkAyscTask chk = new checkAyscTask(task_GetGPS);
// Thread keeping 1 minute time watch
(new Thread(chk)).start();