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

package de.edotzlaff.schockwelle;

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

import android.app.Dialog;
import android.content.Intent;
import android.hardware.Sensor;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GoogleApiAvailability;
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;

public class MainActivity extends FragmentActivity {

    private static final String TAG = "MainActivity";
    private static final int ERROR_DIALOG_REQUEST = 9001;
    private DatabaseReference mDatenbank;


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

        if (isServiceOK()){
            init();
        }

        deviceInitDataBase();   //TODO Edward: Mit dieser Methode wird beim Starten der App die DB mit, vorerst festen, Werten für alle IDG 1-4 initialiert
    }

    private void init(){

        Button btnEarthquake = (Button) findViewById(R.id.btnEarthquake);
        btnEarthquake.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this, EarthquakeMapsActivity.class);
                startActivity(intent);
            }
        });

        Button btnSensor = (Button) findViewById(R.id.btnSensor);
        btnSensor.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this, SensorMapsActivity.class);
                startActivity(intent);
            }
        });
    }

    public boolean isServiceOK(){
        Log.d(TAG, "isServicesOK(): checking google services version");

        int available = GoogleApiAvailability.getInstance().isGooglePlayServicesAvailable(MainActivity.this);

        if (available== ConnectionResult.SUCCESS){
            Log.d(TAG,"isServicesOK: Google Play Services is working");
            return true;
        }
        else if (GoogleApiAvailability.getInstance().isUserResolvableError(available)){
            Log.d(TAG, "isServicesOK(): an error occured but we can fix it");
            Dialog dialog = GoogleApiAvailability.getInstance().getErrorDialog(MainActivity.this, available, ERROR_DIALOG_REQUEST);
            dialog.show();
        }
        else {
            Toast.makeText(this, "You can`t make map request", Toast.LENGTH_SHORT).show();
        }
        return false;
    }

    public void deviceInitDataBase()
    {
        mDatenbank = FirebaseDatabase.getInstance().getReference();
        Devices d1 = new Devices("10.00.00.000", false, 1103456789, 49.45470362290784, 11.151032510281498, 1000);
        Devices d2 = new Devices("20.00.00.000", false, 1203456789, 40.70064147511923, -73.993767997977787, 200);
        Devices d3 = new Devices("30.00.00.000", false, 1303456789, -33.93157129193122, 18.39666975233824, 30);
        Devices d4 = new Devices("40.00.00.000", false, 1403456789, -33.40763257191139, -70.61870273653996, 4);
        mDatenbank.child("overview").child("IDG1").setValue(d1);
        mDatenbank.child("overview").child("IDG2").setValue(d2);
        mDatenbank.child("overview").child("IDG3").setValue(d3);
        mDatenbank.child("overview").child("IDG4").setValue(d4);
        getDataBaseValues();
    }

    public void getDataBaseValues()
    {
        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());
    }
}