Android闪屏Firebase同步

我认为您应该需要自定义回调,以便在所有下载任务完成后触发asynctask。以下是修改后的代码:

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");

    }