ExternGnss/app/src/main/java/fmaps/grabow/com/location001/MainActivity.java

package fmaps.grabow.com.location001;

import android.Manifest;
import android.annotation.SuppressLint;
import android.content.Context;
import android.location.LocationListener;
import android.location.LocationManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
import android.widget.Toast;

import pub.devrel.easypermissions.AfterPermissionGranted;
import pub.devrel.easypermissions.EasyPermissions;

import static java.lang.Thread.sleep;

public class MainActivity extends AppCompatActivity {
    private TextView output;
    private LocationManager locationManager;
    private boolean doRun = true;
    private final Context cntxToastInternGNSSUpdate = this;
    final String[] perms = {Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.INTERNET};
    private boolean bChange = true;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        startLocationInit();
    }

    // From https://github.com/googlesamples/easypermissions
    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        // Forward results to EasyPermissions
        EasyPermissions.onRequestPermissionsResult(requestCode, permissions, grantResults, this);
    }

    @AfterPermissionGranted(123)
    private void startLocationInit() {
        if (EasyPermissions.hasPermissions(this, perms)) {
            // Already have permission, do the thing
            Toast.makeText(cntxToastInternGNSSUpdate, "Permission granted!", Toast.LENGTH_SHORT).show();

            // Get the output UI
            output = (TextView) findViewById(R.id.interngnss);

            // Test print
            ///printlnOnView(output, "Running!");

            locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
            //List<String> providers = locationManager.getAllProviders();

            //for (String temp : providers) {
                // System.out.println(temp);
                //printProvider(temp);
            //}

        } else {
            // Do not have permissions, request them now
            EasyPermissions.requestPermissions(this, "We require location access!!!",
                    123, perms);
        }
    }

/*
    private void printProvider(String provider) {
        LocationProvider info = locationManager.getProvider(provider);
        output.append("Name: " + info.getName() + "\n");
        output.append("Accuracy: " + info.getAccuracy() + "\n");
        output.append("PowerReq.: " + info.getPowerRequirement() + "\n");
        output.append("CellIDReq.: " + info.requiresCell() + "\n");
        output.append("NetworkReq.: " + info.requiresNetwork() + "\n");
        output.append("SatReq.: " + info.requiresSatellite() + "\n\n");
    }
    */


    // Die Nachfolgenden Methoden können Sie aus einem Worker-Thread aufrufen
    private void printlnOnView(final TextView v, final String str) {
        Runnable myRun = new Runnable() {
            public void run() {
                v.setText(str + "\n");
            }
        };
        runOnUiThread(myRun);
    }
  /*
    private void printOnView(final TextView v, final String str) {
        Runnable myRun = new Runnable() {
            public void run() {
                v.append(str);
            }
        };
        runOnUiThread(myRun);
    }

    public void addToString(Location loc) {
        //Verwendet die Variablen centerLat & centerLng
        String time = loc.getTime() +"";
        String latStr = Double.toString(loc.getLatitude());
        String lngStr = Double.toString(loc.getLongitude());
        String acc = loc.getAccuracy() + "";
        String numOfSat = loc.getExtras().getInt("satellites") +"";
        String satStr = "";
        String distStr = "";
        // Bestimme die Distanz (Fix <-> Center)
        Location locationA = new Location("Center");
        locationA.setLatitude(Double.valueOf(centerLat));
        locationA.setLongitude(Double.valueOf(centerLng));
        Location locationB = new Location("Fix");
        locationB.setLatitude(Double.valueOf(latStr));
        locationB.setLongitude(Double.valueOf(lngStr));
        distStr = locationA.distanceTo(locationB) + "";
        logString = logString + time + ";"; logString = logString + numOfSat + ";"; logString = logString + distStr +
                ";"; logString = logString + acc + ";"; logString = logString + latStr + ";"; logString = logString + lngStr
                + ";"; logString = logString + centerLat + ";"; logString = logString + centerLng + ";"; logString =
                logString + satStr + ";"; logString = logString + "\n";
    }
     */

    @SuppressLint("MissingPermission")
    @Override
    protected void onResume() {
        super.onResume();
        if (!EasyPermissions.hasPermissions(this, perms)) {
            // Dummy thread ...
            new Thread(new Runnable() {
                @Override
                public void run() {
                    while (doRun) {
                        Log.i("HAG", "Just do nothing ...");
                        try {
                            sleep(2000);
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                    }
                }
            }).start();
        } else {
            locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);

            // Worker-Thread
            new Thread(
                    new Runnable() {
                        @Override
                        public void run() {


                            while (doRun) {
                              //  Log.i("HAG", "ok");

                                //
                                // Aufgabe 3
                                //
                                // Geben Sie via printOnView die getLastKnownLocation() von
                                // Network-Provider und GPS-Provider aus
                                //

                                printlnOnView(output, "Lat: " + locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER).getLatitude()
                                        + " Long: " + locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER).getLongitude()
                                        + " Accuracy: " + locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER).getAccuracy()



                                );


                                //
                                // Aufgabe 4
                                //
                                // Erzeugen Sie eine WebView und zeigen Sie mittels der WebView
                                // alternierend die Location von Network und GPS auf der Karte an
                                //
                                //

                                runOnUiThread(new Runnable() {
                                    @Override
                                    public void run() {
                                        //Update
                                    }
                                });

                                try {
                                    sleep(10000);
                                } catch (InterruptedException e) {
                                    e.printStackTrace();
                                }
                            }
                        }
                    }).start();

        }
    }

    /**
     * Stop the updates when Activity is paused
     */
    @Override
    protected void onPause() {
        super.onPause();
        doRun = false;
    }

    LocationListener locationListener = new LocationListener() {
        @Override
        public void onLocationChanged(android.location.Location location) {
            //double latitude = location.getLatitude();
            //double longitude = location.getLongitude();
            //String msg = "New Latitude: " + latitude + " New Longitude: " + longitude;
            Toast.makeText(cntxToastInternGNSSUpdate, "Internal GNSS updated", Toast.LENGTH_LONG).show();
        }

       @Override
        // This callback will never be invoked on Android Q and above.
        public void onStatusChanged(String provider, int status, Bundle extras) {
           // Toast.makeText(mContext, "Status Changed", Toast.LENGTH_LONG).show();
        }

        @Override
        public void onProviderEnabled(String provider) {
        }

        @Override
        public void onProviderDisabled(String provider) {
        }
    };
}