Question

我是Android编程新手。我有一个线程，我已请求位置更新。问题是onLocationChanged(Location loc)中的代码永远不会被执行。请解释我如何纠正这个问题。

public void run() {

    Looper.prepare();

        while (isMyServiceRunning()) {

            try {
                Thread.sleep(3000);

            } catch (InterruptedException e) {

                e.printStackTrace();
            }


            try {
                Log.d("spt", "read status started");
                if ((Connectivity.isConnected(getApplicationContext()))) {
                    URL urlreadstatus = new URL("http://asd.fgh.com/status.txt");
                //  Log.d("spt",String.valueOf(URLUtil.isValidUrl("http://asd.fgh.com/status.txt")));
                    BufferedReader in = new BufferedReader( new InputStreamReader(urlreadstatus.openStream()));
                    str = in.readLine();
                    if(!str.equals(null)){
                        Log.d("spt", str);
                    }
                    in.close();
                    Log.d("spt", "read status complete");
                } else {
                    Log.d("spt", "not connected");
                    break;
                }

            } catch (MalformedURLException e1) {

                e1.printStackTrace();
            } catch (IOException e) {

                Log.d("spt", "IO exception");
                str = "11";
                e.printStackTrace();
            } catch(NullPointerException e){
                str="11";
            }
            if (str.equals(null)) {
                str = "11";             
            }
            if (str.length() == 1) {
                loststatus++;
                LocationManager l;
                l=(LocationManager) getSystemService(Context.LOCATION_SERVICE);
                Criteria criteria = new Criteria();
                provider = l.getBestProvider(criteria, false);
                l.requestLocationUpdates("gps", 400, 1, this);
                Log.d("spt", "lost status=1 requesting location updates");

            } else {
                loststatus = 0;
            }

        }

    }
 @Override
    public void onLocationChanged(Location loc) {
        // TODO Auto-generated method stub
        Log.d("spt", "in loc changed");
        double longi = loc.getLongitude();
        double lati = loc.getLatitude();
        double acc=loc.getAccuracy();
        Log.d("spt", String.valueOf(acc));
        if (loststatus > 0) {

            HttpPost httpPost = new HttpPost(
                    "http://asd.fgh.com/writegps.php?value="
                            + String.valueOf(lati) + ","
                            + String.valueOf(longi));
            // output is the variable you used in your program
            try {
                DefaultHttpClient httpClient = new DefaultHttpClient();

                httpClient.execute(httpPost);
                Log.d("spt", "writing coord to file");

            } catch (ClientProtocolException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

            Toast.makeText(this, String.valueOf(lati) + String.valueOf(longi),
                Toast.LENGTH_SHORT).show();

        }
    }

Answer 1

尝试按照以下方式设置位置监听器，就像在课堂上实现一个位置一样（假设您在视线范围内执行了该操作）：

private void setupLocationUpdates() {

    // Acquire a reference to the system Location Manager
    mLocationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
    // Define a listener that responds to location updates
    mLocationListener = new LocationListener() {
        // Called when the location has changed.
        public void onLocationChanged(Location location) {
            mLocation = location;
            // DO SOMETHING HERE
        }
      };
    mlocationProvider = LocationManager.GPS_PROVIDER;
    // Register for location updates 
    mLocationManager.requestLocationUpdates(mlocationProvider, 0, 0, mLocationListener);
}

无法使用GPS

1 个答案: