如何为设置超时运行异步任务？

概述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)并传递Lattitude/Longitude的默认值.我试过用这个：newGetGPShotfix().execute().ge

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);以便为此异步设置一个超时的超时,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,它跳过下一行而不等待Async设置的超时.

我怎样才能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..

解决方法:

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 *** 作.您可以创建一个实现runnable的类,并将asyctask作为构造函数参数传递并在其中取消它.

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();

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