Android Splash Screen Firebase Synchronisation

Question

ich einen Splash-Screen für mein Android App erstellt haben,

in dieser Aktivität Ich brauche ein paar Geräusche von Feuerbasis Speicher zum Herunterladen und synchronisiert meine lokale Datenbank mit Feuerbasis Echtzeit-Datenbank.

aber wenn ich die App starte, sehe ich in meinem Protokoll die Synchronisation mit Firebase weiter nach dem Startbildschirm und die Daten sind nicht in der Gebietsschema-Datenbank, wenn die mainActivity gestartet wird. Wer zum Starten der MainActivity nach der Firebase-Synchronisation zu tun ist.

Mein Code:

public class SplashScreen extends Activity { 

// Splash screen timer 
private static int SPLASH_TIME_OUT = 3000; 

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

    File folder = new File(Environment.getExternalStorageDirectory() + "/"+getString(R.string.folder_name)); 
    if(!folder.exists()) { 
     folder.mkdir(); 
    } 

    new DataSyncFb(this).execute(); 
} 



public class DataSyncFb extends AsyncTask<Void, Integer, Void> { 


    private Context context; 
    private StorageReference mStorageRef; 


    public DataSyncFb(final Context context) { 
     this.context = context; 
    } 

    @Override 
    protected void onPreExecute() { 
     super.onPreExecute(); 
     Log.i("DataSincFB", "onPreExecute"); 
    } 


    @Override 
    protected Void doInBackground(Void... voids) { 
     final DatabaseHandler db = new DatabaseHandler(context); 
     final FirebaseDatabase database = FirebaseDatabase.getInstance(); 

     DatabaseReference dbRef = database.getReference("categorie"); 
     dbRef.addValueEventListener(new ValueEventListener() { 
      @Override 
      public void onDataChange(DataSnapshot dataSnapshot) { 
       try { 
        List<String> listCat = db.getAllCategoriesId(); 
        List<String> listSounds = db.getAllSoundsId(); 
        Log.i("test", String.valueOf(dataSnapshot.getValue())); 
        Gson test = new Gson(); 

        JSONArray jsonArray = new JSONArray(test.toJson(dataSnapshot.getValue())); 

        for (int i = 0; i < jsonArray.length(); i++){ 
         JSONObject cat = jsonArray.getJSONObject(i); 
         String nom = cat.getString("nom"); 
         String id = cat.getString("id"); 
         if (!listCat.contains(id)) { 
          db.addCategorie(nom, id); 
         } 

         JSONArray sounds = cat.getJSONArray("son"); 
         Log.i("cat", sounds.toString()); 
         for (int j = 0; j < sounds.length(); j++){ 
          JSONObject sound = sounds.getJSONObject(j); 
          String soundId = sound.getString("id"); 
          if (!listSounds.contains(soundId)){ 
           //downloadFile(sound.getString("lien")); 


           FirebaseStorage storage = FirebaseStorage.getInstance(); 
           StorageReference storageRef = storage.getReferenceFromUrl("gs://soundbox-a6dd8.appspot.com"); 
           StorageReference islandRef = storageRef.child(sound.getString("lien")+".mp3"); 

           File rootPath = new File(Environment.getExternalStorageDirectory(), context.getString(R.string.folder_name)); 
           if(!rootPath.exists()) { 
            rootPath.mkdirs(); 
           } 

           final File localFile = new File(rootPath,sound.getString("lien")+".mp3"); 

           islandRef.getFile(localFile).addOnSuccessListener(new OnSuccessListener<FileDownloadTask.TaskSnapshot>() { 
            @Override 
            public void onSuccess(FileDownloadTask.TaskSnapshot taskSnapshot) { 
             Log.e("firebase ",";local tem file created created " +localFile.toString()); 
             // updateDb(timestamp,localFile.toString(),position); 
            } 
           }).addOnFailureListener(new OnFailureListener() { 
            @Override 
            public void onFailure(@NonNull Exception exception) { 
             Log.e("firebase ",";local tem file not created created " +exception.toString()); 
            } 
           }); 

           db.addSound(soundId, sound.getString("nom"), sound.getString("lien") ,id); 

          } 

         } 
        } 
        Log.i("sound", String.valueOf(db.getAllSound())); 
        Log.i("Firebase", jsonArray.toString()); 
        Log.i("Firebase", String.valueOf(db.getAllCategories())); 
       } catch (JSONException e) { 
        e.printStackTrace(); 
       } 

      } 

      @Override 
      public void onCancelled(DatabaseError databaseError) { 

      } 
     }); 
     return null; 
    } 

    @Override 
    protected void onPostExecute(Void aVoid) { 
     super.onPostExecute(aVoid); 
     Log.i("DataSyncFB", "onPostExecute"); 
     Intent i = new Intent(SplashScreen.this, MainActivity.class); 
     startActivity(i); 

     // close this activity 
     finish(); 
    } 

Answer 1

Ich denke, Sie sollten benutzerdefinierten Rückruf für Ihre AsyncTask müssen ausgelöst werden, wenn alle Ihre Download-Aufgaben fertig sind. Hier ist der modifizierte Code:

public class SplashScreen extends Activity { 

// Splash screen timer 
private static int SPLASH_TIME_OUT = 3000; 

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

    File folder = new File(Environment.getExternalStorageDirectory() + "/"+getString(R.string.folder_name)); 
    if(!folder.exists()) { 
     folder.mkdir(); 
    } 

    new DataSyncFb(this, new DataSyncFb.OnTaskFinishedCallback(

     @Override 
     public void onTaskFinished() { 
      Intent i = new Intent(SplashScreen.this, MainActivity.class); 
      startActivity(i); 

      // close this activity 
      finish(); 
     } 
    )).execute(); 
} 



public class DataSyncFb extends AsyncTask<Void, Integer, Void> { 
    // Custom callback 
    public interface OnTaskFinishedCallback { 
     public void onTaskFinished(); 
    } 

    private Context context; 
    private StorageReference mStorageRef; 
    private OnTaskFinishedCallback callback; 


    public DataSyncFb(final Context context, OnTaskFinishedCallback callback) { 
     this.context = context; 
     this.callback = callback; 
    } 

    @Override 
    protected void onPreExecute() { 
     super.onPreExecute(); 
     Log.i("DataSincFB", "onPreExecute"); 
    } 


    @Override 
    protected Void doInBackground(Void... voids) { 
     final DatabaseHandler db = new DatabaseHandler(context); 
     final FirebaseDatabase database = FirebaseDatabase.getInstance(); 

     DatabaseReference dbRef = database.getReference("categorie"); 
     dbRef.addValueEventListener(new ValueEventListener() { 
      @Override 
      public void onDataChange(DataSnapshot dataSnapshot) { 
       try { 
        List<String> listCat = db.getAllCategoriesId(); 
        List<String> listSounds = db.getAllSoundsId(); 
        Log.i("test", String.valueOf(dataSnapshot.getValue())); 
        Gson test = new Gson(); 

        JSONArray jsonArray = new JSONArray(test.toJson(dataSnapshot.getValue())); 
        int totalDownloadCounter = 0; 
        int downloadCounter = 0; 
        // Determine how much files you should download first 
        for (int i = 0; i < jsonArray.length(); i++) { 
         JSONObject cat = jsonArray.getJSONObject(i); 
         JSONArray sounds = cat.getJSONArray("son"); 
         for (int j = 0; j < sounds.length(); j++){ 
          String soundId = sound.getString("id"); 
          if (!listSounds.contains(soundId)) { 
           totalDownloadCounter++; 
          } 
         } 
        } 

        for (int i = 0; i < jsonArray.length(); i++){ 
         JSONObject cat = jsonArray.getJSONObject(i); 
         String nom = cat.getString("nom"); 
         String id = cat.getString("id"); 
         if (!listCat.contains(id)) { 
          db.addCategorie(nom, id); 
         } 

         JSONArray sounds = cat.getJSONArray("son"); 
         Log.i("cat", sounds.toString()); 
         for (int j = 0; j < sounds.length(); j++){ 
          JSONObject sound = sounds.getJSONObject(j); 
          String soundId = sound.getString("id"); 
          if (!listSounds.contains(soundId)){ 
           //downloadFile(sound.getString("lien")); 

           FirebaseStorage storage = FirebaseStorage.getInstance(); 
           StorageReference storageRef = storage.getReferenceFromUrl("gs://soundbox-a6dd8.appspot.com"); 
           StorageReference islandRef = storageRef.child(sound.getString("lien")+".mp3"); 

           File rootPath = new File(Environment.getExternalStorageDirectory(), context.getString(R.string.folder_name)); 
           if(!rootPath.exists()) { 
            rootPath.mkdirs(); 
           } 

           final File localFile = new File(rootPath,sound.getString("lien")+".mp3"); 

           islandRef.getFile(localFile).addOnSuccessListener(new OnSuccessListener<FileDownloadTask.TaskSnapshot>() { 
            @Override 
            public void onSuccess(FileDownloadTask.TaskSnapshot taskSnapshot) { 
             Log.e("firebase ",";local tem file created created " +localFile.toString()); 
             downloadCounter++; 
             // updateDb(timestamp,localFile.toString(),position); 
             if (downloadCounter == totalDownloadCounter) { 
              callback.onTaskFinished(); 
             } 
            } 
           }).addOnFailureListener(new OnFailureListener() { 
            @Override 
            public void onFailure(@NonNull Exception exception) { 
             Log.e("firebase ",";local tem file not created created " +exception.toString()); 
             downloadCounter++; 
             if (downloadCounter == totalDownloadCounter) { 
              callback.onTaskFinished(); 
             } 
            } 
           }); 

           db.addSound(soundId, sound.getString("nom"), sound.getString("lien") ,id); 

          } 

         } 
        } 
        Log.i("sound", String.valueOf(db.getAllSound())); 
        Log.i("Firebase", jsonArray.toString()); 
        Log.i("Firebase", String.valueOf(db.getAllCategories())); 
       } catch (JSONException e) { 
        e.printStackTrace(); 
       } 

      } 

      @Override 
      public void onCancelled(DatabaseError databaseError) { 

      } 
     }); 
     return null; 
    } 

    @Override 
    protected void onPostExecute(Void aVoid) { 
     super.onPostExecute(aVoid); 
     Log.i("DataSyncFB", "onPostExecute"); 

    }