运行进度对话框，直到在 Android 应用程序中找不到 GPS i.d

Question

我制作了一个 android 应用程序，它有助于在 A-GPS 的帮助下找到 GPS 位置，从设置中打开 GPS 后，我想运行进度对话框，直到纬度和经度大于零。我是新手，我编写了以下无法正常工作的代码。 任何帮助将不胜感激

谢谢

   package com.example.gpsutility;



    import android.os.Bundle;
    import android.app.Activity;
    import android.app.ProgressDialog;
    import android.util.Log;
    import android.view.View;
     import android.view.View.OnClickListener;
    import android.widget.Button;
    import android.widget.TextView;
    import android.widget.Toast;

      public class GPSActivity extends Activity implements OnClickListener {
 Button search,exit;
 TextView location_tv;
 GpsService gps;
 ProgressDialog progressDialog = null;
 double latitude,longitude;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_gps);
    search = (Button)findViewById(R.id.search_button);
    exit = (Button)findViewById(R.id.exit_button);
    location_tv =(TextView)findViewById(R.id.textview2);
    gps = new GpsService(this);
    search.setOnClickListener(this);
    exit.setOnClickListener(this);
}

@Override
public void onClick(View v) {
    // TODO Auto-generated method stub
    if(v==search)
    {       
         progressDialog = ProgressDialog.show(this, "", "getting    location...", true);

           new Thread(new Runnable() {
                        public void run() {
                             runOnUiThread(new Runnable() {
                                    public void run() {
             if(latitude<=0 && longitude<=0)
             {
                 do{
                     latitude =gps.getLatitude();
                     longitude = gps.getLongitude();
           //        location_tv.setText("Location is -\nLat: "+latitude+  "\nLong: "+longitude );
                 }while(latitude<=0 && longitude<=0);

                 location_tv.setText("        Location is-\nLat:"+latitude+"\nLong: "+longitude );       
                   progressDialog.dismiss();


             }else{
                 location_tv.setText("        Location is-\nLat:"+latitude+"\nLong: "+longitude );       
                 Log.e("latlong", latitude + ""+longitude);
                   progressDialog.dismiss();

             }
                                    }
                                });                      


                                       }

                      }).start(); }

if(v==exit)
  {
        finish();
   }
}




}

我使用的 GPS SERVICE 类是

  package com.example.gpsutility;



     public class GpsService extends Service implements LocationListener {

private final Context mContext;
   boolean isGPSEnabled = false;
   boolean isNetworkEnabled = false;
   boolean canGetLocation = false;
   Location location;
   double latitude;
   double longitude;
   public static final long MIN_DISTANCE_CHANGE_FOR_UPDATES=10;
   public static final long MIN_TIME_BW_UPDATES=1000*60*1;
   protected LocationManager locationManager;


     public GpsService(Context context)
     {
         this.mContext=context;
         getLocation();
     }
    @Override
    public void onLocationChanged(Location location) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onProviderDisabled(String provider) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onProviderEnabled(String provider) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
        // TODO Auto-generated method stub

    }

    @Override
    public IBinder onBind(Intent arg0) {
        // TODO Auto-generated method stub
        return null;
    }

    public Location getLocation()
    {
        try {
            locationManager =(LocationManager)

mContext.getSystemService(LOCATION_SERVICE); isGPSEnabled=locationManager.isProviderEnabled(locationManager.GPS_PROVIDER);

            isNetworkEnabled = locationManager.isProviderEnabled(locationManager.NETWORK_PROVIDER);

            if(!isGPSEnabled || !isNetworkEnabled)
            {
                showSettingsAlert();
            }
            else {
                this.canGetLocation=true;
                if(isNetworkEnabled) 
                 {
                  locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,
                          MIN_TIME_BW_UPDATES,
                          MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                  Log.d("Network", "Network");
                  if (locationManager != null) {
                      location = locationManager
                              .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                      if (location != null) {
                          latitude = location.getLatitude();
                          longitude = location.getLongitude();
                      }
                }
                 }
                if (isGPSEnabled) {
                    if (location == null) {
                        locationManager.requestLocationUpdates(
                                LocationManager.GPS_PROVIDER,
                                MIN_TIME_BW_UPDATES,
                                MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                        Log.d("GPS Enabled", "GPS Enabled");
                        if (locationManager != null) {
                            location = locationManager
                                    .getLastKnownLocation(LocationManager.GPS_PROVIDER);
                            if (location != null) {
                                latitude = location.getLatitude();
                                longitude = location.getLongitude();
                            }
                        }
                    }
                }
            }

        } catch (Exception e) {
            e.printStackTrace();
        }

        return location;
    }


     public double getLatitude(){
            if(location != null){
                latitude = location.getLatitude();
            }

            // return latitude
            return latitude;
        }

        /**
         * Function to get longitude
         * */
        public double getLongitude(){
            if(location != null){
                longitude = location.getLongitude();
            }

            // return longitude
            return longitude;
    }
        public boolean canGetLocation() {
            return this.canGetLocation;
        }

        public void showSettingsAlert(){
            AlertDialog.Builder alertDialog = new  AlertDialog.Builder(mContext);

            // Setting Dialog Title
            alertDialog.setTitle("GPS  settings");

            // Setting Dialog Message
            alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");

            // Setting Icon to Dialog
            //alertDialog.setIcon(R.drawable.delete);

            // On pressing Settings button
            alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog,int which) {
                    Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                    mContext.startActivity(intent);
                }
            });

            // on pressing cancel button
            alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                dialog.cancel();
                }
            });

            // Showing Alert Message
            alertDialog.show();
        }



        }

Answer 1

试试这个。

ProgressDialog progressBar;
int progressStatus = 0;

progressBar = new ProgressDialog(this);
progressBar.setCancelable(false);
progressBar.setMessage("getting location...");
progressBar.setProgressStyle(ProgressDialog.STYLE_SPINNER);
progressBar.setProgress(0);
progressBar.setMax(100);
progressBar.show();
progressBarStatus = 0;


new Thread(new Runnable() {
          public void run() {
            while (progressBarStatus < 100) {

              progressBarStatus = getLocation();

              try {
                Thread.sleep(1000);
              } catch (InterruptedException e) {
                e.printStackTrace();
              }

              progressBarHandler.post(new Runnable() {
                public void run() {
                  progressBar.setProgress(progressBarStatus);
                }
              });
            }

            if (progressBarStatus >= 100) {
                try {
                    Thread.sleep(2000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                progressBar.dismiss();
            }
          }
          }).start();


private int getLocation()
{
    GpsService gps = new GpsService(this)
    latitude = gps.getLatitude();
    longitude = gps.getLongitude();

    if(latitude > 0 && longitude > 0)
        return 100;
    else
        return 0;

}

另外，您确定需要将其用作服务吗？或者这只是一个名字，它真的只是一个简单的类？如果它是一个简单的类并且您只是通过按钮或任何操作来拉位置，您可以使用上面的代码。因为当您在 android 中说 Service 时，您是在后台运行它，并且如果您想在 X 间隔后重复执行进程并在您通过代码停止它或使用 stopSelf() 时停止，则需要创建一个处理程序。如果它确实是一项服务，您需要为您的活动创建一个广播侦听器，并使用该服务发送广播并根据广播更新您的 UI。我希望这有帮助。干杯！