mMDT5_PR_MSY1_Gruppe1/app/src/main/java/de/edotzlaff/schockwelle/SensorMapsActivity.java

package de.edotzlaff.schockwelle;

import androidx.annotation.NonNull;
import androidx.fragment.app.FragmentActivity;

import android.location.Location;
import android.os.Bundle;
import android.os.SystemClock;
import android.util.Log;
import android.widget.TextView;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;

import org.w3c.dom.Text;

public class SensorMapsActivity extends FragmentActivity implements OnMapReadyCallback {

    private GoogleMap mMap;
    private DatabaseReference mDatenbank;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_sensor_maps);

        TextView tv= (TextView) findViewById(R.id.txtSensor);

        initMap();
    }

    void initMap(){
        // Obtain the SupportMapFragment and get notified when the map is ready to be used.
        SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);
    }

    @Override
    public void onMapReady(GoogleMap googleMap) {
        mMap = googleMap;

        // Add a marker in Sydney and move the camera
        LatLng sydney = new LatLng(-34, 151);
        mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
        mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
    }

    //TODO Edward: Mit Methode getDataBaseValues werden die Werte in der DB abgefragt. In Methode processDataBaseValues werden diese beispielhaft ausgelesen. Kann nach Bedarf angepasst werden.
    public void getDataBaseValues()
    {
        mDatenbank = FirebaseDatabase.getInstance().getReference();
        mDatenbank.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot snapshot) {
                processDataBaseValues(snapshot);                           //Daten - Snapshot, Übergabe an Methode DataChangeProtocol
            }
            @Override
            public void onCancelled(@NonNull DatabaseError error) {
                getDataBaseFailure(error);
            }
        });
    }

    public void processDataBaseValues (DataSnapshot data)
    {
        for (int i = 1; i<=4; i++)  //Für alle IDG 1-4 werden Werte ausgegeben
        {
            //####### Auslesen für String-Werte #######:
            String ipAdresse = data.child("overview").child("IDG" + i).child("ip").getValue().toString();

            //####### Auslesen für boolean-Werte #######:
            String vibrationString = data.child("overview").child("IDG" + i).child("vibration").getValue().toString();
            boolean vibration;
            if(vibrationString == "true"){
                vibration = true;
            }else{
                vibration = false;
            }

            //####### Auslesen für double-Werte #######:
            String breitengradString = data.child("overview").child("IDG" + i).child("breitengrad").getValue().toString();
            String laengengradString = data.child("overview").child("IDG" + i).child("laengengrad").getValue().toString();
            double breitengrad = Double.parseDouble(breitengradString);
            double laengengrad = Double.parseDouble(laengengradString);

            //####### Auslesen für long-Werte #######:
            String timestampString = data.child("overview").child("IDG" + i).child("timestamp").getValue().toString();
            long timestamp = Long.parseLong(timestampString);

            //####### Auslesen für ing-Werte #######:
            String amplitudeString = data.child("overview").child("IDG" + i).child("amplitude").getValue().toString();
            int amplitude = Integer.parseInt(amplitudeString);

            //####### Optional zur Kontrolle #######:
            /*
            System.out.println("IDG" + i + " -          IP:" + data.child("overview").child("IDG" + i).child("ip").getValue().toString());
            System.out.println("IDG" + i + " -   Vibration:" + data.child("overview").child("IDG" + i).child("vibration").getValue().toString());
            System.out.println("IDG" + i + " - Zeitstempel:" + data.child("overview").child("IDG" + i).child("timestamp").getValue().toString());
            System.out.println("IDG" + i + " - Breitengrad:" + data.child("overview").child("IDG" + i).child("breitengrad").getValue().toString());
            System.out.println("IDG" + i + " - Laengengrad:" + data.child("overview").child("IDG" + i).child("laengengrad").getValue().toString());
            System.out.println("IDG" + i + " -   Amplitude:" + data.child("overview").child("IDG" + i).child("amplitude").getValue().toString());
            */
        }
    }

    public void getDataBaseFailure (DatabaseError error)
    {
        System.out.println("Fehler");
        Log.w("Datenbankfehler", error.toException());
    }

    //TODO Edward Distanz zwischen zwei Punkten berechnen
    //TODO Edward Dauer für Timer berechnen bis Smartphone vibriert
    /*
    private float distance(double currentlatitude, double currentlongitude, double originLat, double originLon) {

        float[] results = new float[1];
        Location.distanceBetween(currentlatitude, currentlongitude, -34, 151, results);
        float distanceInMeters = results[0];

        return distanceInMeters;
    }
*/
}