Wie kann ich diese Variablen zwischen einer Aktivität und einer Klasse teilen?

Question

Ich habe eine App, die einen Service verwendet. Aus irgendeinem Grund erkennt der Dienst die Variablen "placeArrayList", "latitudeArrayList", "longitudeArrayList" und "destination" jedoch nicht.
Was kann ich hier tun?

MainActivity.java

public class MainActivity extends AppCompatActivity { 
PlacePicker.IntentBuilder builder; 
int PLACE_PICKER_REQUEST; 
ListView placeListView; 
ArrayList<String> placeArrayList; 
ArrayList<String> latitudeArrayList; 
ArrayList<String> longitudeArrayList; 
ArrayAdapter<String> arrayAdapter; 
SharedPreferences sharedPreferences; 
SharedPreferences.Editor editor; 
ArrayList<Double> latitudeList; 
Integer counter; 
LocationManager locationManager; 
String provider; 
double lat; 
double lng; 
Place place; 
static Set<String> set; 
static Set<String> set1; 
static Set<String> set2; 
Location location; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_main); 
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
setSupportActionBar(toolbar); 
placeListView = (ListView) findViewById(R.id.placeListView); 
latitudeList = new ArrayList<>(); 
placeArrayList = new ArrayList<String>(); 
latitudeArrayList = new ArrayList<String>(); 
longitudeArrayList = new ArrayList<String>(); 



LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); 
String provider = locationManager.getBestProvider(new Criteria(), false); 


if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) { 
    // TODO: Consider calling 
    // ActivityCompat#requestPermissions 
    // here to request the missing permissions, and then overriding 
    // public void onRequestPermissionsResult(int requestCode, String[] permissions, 
    //           int[] grantResults) 
    // to handle the case where the user grants the permission. See the documentation 
    // for ActivityCompat#requestPermissions for more details. 
    return; 
} 
final Location location = locationManager.getLastKnownLocation(provider); 


final Location destination = new Location(provider); 
destination.setLatitude(location.getLatitude()); 
destination.setLongitude(location.getLongitude()); 
Log.e("shit", String.valueOf(location.distanceTo(destination))); 


ListView listView = (ListView) findViewById(R.id.placeListView); 

SharedPreferences sharedPreferences = this.getSharedPreferences("bro", Context.MODE_PRIVATE); 

set = sharedPreferences.getStringSet("names", null); 

set1 = sharedPreferences.getStringSet("lats", null); 
set2 = sharedPreferences.getStringSet("lngs", null); 


placeArrayList.clear(); 
latitudeArrayList.clear(); 
longitudeArrayList.clear(); 

if (set != null) { 

    placeArrayList.addAll(set); 
    latitudeArrayList.addAll(set1); 
    longitudeArrayList.addAll(set2); 

} else { 

    placeArrayList.add("Hold to delete"); 
    set = new HashSet<String>(); 
    set.addAll(placeArrayList); 
    sharedPreferences.edit().putStringSet("names", set).apply(); 
    latitudeArrayList.add(String.valueOf("66.56083")); 
    set1 = new HashSet<String>(); 
    set1.addAll(latitudeArrayList); 
    sharedPreferences.edit().putStringSet("lats", set1).apply(); 
    longitudeArrayList.add(String.valueOf("39.3232")); 
    set2 = new HashSet<String>(); 
    set2.addAll(longitudeArrayList); 
    sharedPreferences.edit().putStringSet("lngs", set2).apply(); 

} 



arrayAdapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, placeArrayList); 

listView.setAdapter(arrayAdapter); 





placeListView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() { 
    @Override 
    public boolean onItemLongClick(AdapterView<?> parent, View view, final int position, long id) { 


     new AlertDialog.Builder(MainActivity.this) 
       .setIcon(android.R.drawable.ic_dialog_alert) 
       .setTitle("Are you sure?") 
       .setMessage("Do you want to delete this place?") 
       .setPositiveButton("Yes", new DialogInterface.OnClickListener() { 
        @Override 
        public void onClick(DialogInterface dialog, int which) { 


         placeArrayList.remove(position); 

         latitudeArrayList.remove(position); 

         SharedPreferences sharedPreferences = MainActivity.this.getSharedPreferences("bro", Context.MODE_PRIVATE); 

         if (set == null) { 

          set = new HashSet<String>(); 
          set1 = new HashSet<String>(); 
          set2 = new HashSet<String>(); 

         } else { 

          set.clear(); 
          set1.clear(); 
          set2.clear(); 

         } 


         set.addAll(placeArrayList); 
         set1.addAll(latitudeArrayList); 
         set2.addAll(longitudeArrayList); 
         sharedPreferences.edit().remove("names").apply(); 
         sharedPreferences.edit().remove("lats").apply(); 
         sharedPreferences.edit().remove("lngs").apply(); 
         sharedPreferences.edit().putStringSet("names", set).apply(); 
         sharedPreferences.edit().putStringSet("lats", set1).apply(); 
         sharedPreferences.edit().putStringSet("lngs", set2).apply(); 
         arrayAdapter.notifyDataSetChanged(); 


        } 
       }) 
       .setNegativeButton("No", null) 
       .show(); 


     return false; 
    } 
}); 




final android.os.Handler handler = new android.os.Handler(); 
Runnable run = new Runnable() { 
    @Override 
    public void run() { 

     if (location != null) { 


      lat = location.getLatitude(); 

      lng = location.getLongitude(); 


      if (placeArrayList.size() != 0) { 
       for (int i = 0; i < placeArrayList.size(); i++) { 


        Log.e("hello", String.valueOf(Float.parseFloat(latitudeArrayList.get(i)))); 

        destination.setLatitude(Double.parseDouble(latitudeArrayList.get(i))); 
        destination.setLongitude(Double.parseDouble(longitudeArrayList.get(i))); 
        Log.e("distancemeters", String.valueOf(location.distanceTo(destination))); 

        if (location.distanceTo(destination)<100) { 




         AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE); 

         audioManager.setStreamVolume(AudioManager.STREAM_RING, AudioManager.RINGER_MODE_SILENT, AudioManager.FLAG_SHOW_UI); 


        } else { 



        } 

       } 


      } 
     } 


     handler.postDelayed(this, 10000); 
    } 
}; 
handler.post(run); 










arrayAdapter.notifyDataSetChanged(); 
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); 
fab.setOnClickListener(new View.OnClickListener() { 
    @Override 
    public void onClick(View view) { 
     PLACE_PICKER_REQUEST = 1; 
     builder = new PlacePicker.IntentBuilder(); 
     pickPlace(); 

    } 
}); 
} 


public void pickPlace() { 

try { 
    startActivityForResult(builder.build(this), PLACE_PICKER_REQUEST); 
} catch (GooglePlayServicesRepairableException e) { 
    e.printStackTrace(); 
} catch (GooglePlayServicesNotAvailableException e) { 
    e.printStackTrace(); 
} 


} 




@Override 
protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
super.onActivityResult(requestCode, resultCode, data); 

if (requestCode == PLACE_PICKER_REQUEST) { 
    if (resultCode == RESULT_OK) { 
     place = PlacePicker.getPlace(data, this); 
     // String toastMsg = String.format("Place: %s", place.getName()); 
     //Toast.makeText(this, toastMsg, Toast.LENGTH_LONG).show(); 



     placeArrayList.add(String.valueOf(place.getName())); 
     latitudeArrayList.add(String.valueOf(place.getLatLng().latitude)); 
     longitudeArrayList.add(String.valueOf(place.getLatLng().longitude)); 
     arrayAdapter.notifyDataSetChanged(); 
     startService(new Intent(getBaseContext(), myService.class)); 

     SharedPreferences sharedPreferences = getSharedPreferences("bro", Context.MODE_PRIVATE); 

     if (set == null) { 

      set = new HashSet<String>(); 
      set1 = new HashSet<String>(); 
      set2 = new HashSet<String>(); 

     } else { 

      set.clear(); 
      set1.clear(); 
      set2.clear(); 

     } 


     arrayAdapter.notifyDataSetChanged(); 
     set.addAll(placeArrayList); 
     set1.addAll(latitudeArrayList); 
     set2.addAll(longitudeArrayList); 
     sharedPreferences.edit().remove("names").apply(); 
     sharedPreferences.edit().remove("lats").apply(); 
     sharedPreferences.edit().remove("lngs").apply(); 
     sharedPreferences.edit().putStringSet("names", set).apply(); 
     sharedPreferences.edit().putStringSet("lats", set1).apply(); 
     sharedPreferences.edit().putStringSet("lngs", set2).apply(); 





    } 

} 
} 




@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
// Inflate the menu; this adds items to the action bar if it is present. 
getMenuInflater().inflate(R.menu.menu_main, menu); 
return true; 
} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
// Handle action bar item clicks here. The action bar will 
// automatically handle clicks on the Home/Up button, so long 
// as you specify a parent activity in AndroidManifest.xml. 
int id = item.getItemId(); 

//noinspection SimplifiableIfStatement 
if (id == R.id.action_settings) { 
    return true; 
} 

return super.onOptionsItemSelected(item); 
} 


} 

myService.java

public class myService extends Service implements LocationListener { 
Double lat; 
Double lng; 
@Override 
public IBinder onBind(Intent arg0) { 
return null; 
} 

@Override 
public int onStartCommand(Intent intent, int flags, int startId) { 
// Let it continue running until it is stopped. 
Toast.makeText(this, "Service Started", Toast.LENGTH_LONG).show(); 
return START_STICKY; 


} 

@Override 
public void onDestroy() { 
super.onDestroy(); 
Toast.makeText(this, "Service Destroyed", Toast.LENGTH_LONG).show(); 
} 

@Override 
public void onLocationChanged(Location location) { 

if (location != null) { 


    lat = location.getLatitude(); 

    lng = location.getLongitude(); 


    if (placeArrayList.size() != 0) { 
     for (int i = 0; i < placeArrayList.size(); i++) { 


      Log.e("hello", String.valueOf(Float.parseFloat(latitudeArrayList.get(i)))); 

      destination.setLatitude(Double.parseDouble(latitudeArrayList.get(i))); 
      destination.setLongitude(Double.parseDouble(longitudeArrayList.get(i))); 
      Log.e("distancemeters", String.valueOf(location.distanceTo(destination))); 

      if (location.distanceTo(destination)<100) { 




       AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE); 

       audioManager.setStreamVolume(AudioManager.STREAM_RING, AudioManager.RINGER_MODE_SILENT, AudioManager.FLAG_SHOW_UI); 


      } else { 



      } 

     } 


    } 
} 

} 

@Override 
public void onStatusChanged(String provider, int status, Bundle extras) { 

} 

@Override 
public void onProviderEnabled(String provider) { 

} 

@Override 
public void onProviderDisabled(String provider) { 

} 
} 

Answer 1

Sie können die Variablen statisch machen.
Und dann verweisen Sie sie, indem Sie ihnen den Namen der Aktivität voranstellen.

Answer 2

Da der Service ist eine separate Klasse macht es Sinn, dass sie keinen Zugang haben zu den Bereichen MainAcitivity wäre in der Lage, da sie nicht zu "myService" gehören.

Wenn Sie Informationen zwischen einer aufrufenden Aktivität und dem aufgerufenen Dienst austauschen möchten, können Sie Daten in einem Schlüsselwertspeicher über die Absicht weiterleiten.

können Sie legen Schlüsselwerte direkt in eine Intent:

Intent intent = new Intent(getBaseContext(), myService.class); 
itent.putExtra(key, value); 

Sie können ein Bundle bauen und fügen Sie es auch auf die Absicht. Bündel haben ein paar mehr Methoden, die es einfacher machen, reichhaltige Daten in sie einzufügen.

Bundle bundle = new Bundle(); 
bundle.extras.putString(key, value); 
intent.putExtras(mBundle); 

Mehr über Bundles über die Dokumentation: http://developer.android.com/reference/android/os/Bundle.html

Wenn Sie interessant sind eine Menge Daten im Vorbeigehen, die nicht leicht in Schlüsselwertepaare dargestellt werden können, dann können Sie Ihre Daten organisieren in Ihre eigene Parcable-Klasse, die auch durch eine Absicht übergeben werden kann. Mehr auf Ihre eigene Parceable über die Dokumentation zu machen: http://developer.android.com/reference/android/os/Parcelable.html und über diese Antwort How to send an object from one Android Activity to another using Intents?

Answer 3

Sie keine Variablen als statisch machen. Weil es Speicherlecks verursachen kann. Und es ist überhaupt keine gute Idee. Besser ist es, eine Schnittstelle zu schreiben und sie in der MainActivity-Klasse zu implementieren. Diese Schnittstelle verfügt über Methoden zum Zuweisen neuer Werte zu Variablen. Und rufen Sie die Interface-Methoden von Ihrem Dienst.