Java DatabaseReference.keepSynced方法代碼示例

import com.google.firebase.database.DatabaseReference; //導入方法依賴的package包/類
@Test
public void testMultipleKeepSynced() throws Exception {
  DatabaseReference ref = IntegrationTestUtils.getRandomNode(masterApp);

  try {
    ref.keepSynced(true);
    ref.keepSynced(true);
    ref.keepSynced(true);
    assertIsKeptSynced(ref);

    // If it were balanced, this would not be enough
    ref.keepSynced(false);
    ref.keepSynced(false);
    assertNotKeptSynced(ref);

    // If it were balanced, this would not be enough
    ref.keepSynced(true);
    assertIsKeptSynced(ref);
  } finally {
    // cleanup
    ref.keepSynced(false);
  }
}
 

import com.google.firebase.database.DatabaseReference; //導入方法依賴的package包/類
@Test
public void testRemoveSingleListener() throws Exception {
  DatabaseReference ref = IntegrationTestUtils.getRandomNode(masterApp);

  ref.keepSynced(true);
  try {
    assertIsKeptSynced(ref);

    // This will add and remove a listener.
    new ReadFuture(
        ref,
        new ReadFuture.CompletionCondition() {
          @Override
          public boolean isComplete(List<EventRecord> events) {
            return true;
          }
        })
        .timedGet();

    assertIsKeptSynced(ref);
  } finally {
    // cleanup
    ref.keepSynced(false);
  }
}
 

import com.google.firebase.database.DatabaseReference; //導入方法依賴的package包/類
@Test
public void testKeepSyncedWithExistingListener() throws Exception {
  DatabaseReference ref = IntegrationTestUtils.getRandomNode(masterApp);

  ReadFuture readFuture;
  ref.keepSynced(true);
  try {
    assertIsKeptSynced(ref);

    readFuture =
        new ReadFuture(ref, new ReadFuture.CompletionCondition() {
            @Override
            public boolean isComplete(List<EventRecord> events) {
              return events.get(events.size() - 1).getSnapshot().getValue().equals("done");
            }
          });
  } finally {
    // cleanup
    ref.keepSynced(false);
  }

  // Should trigger our listener.
  ref.setValueAsync("done");
  readFuture.timedGet();
}
 

import com.google.firebase.database.DatabaseReference; //導入方法依賴的package包/類
private void addItem(HashMap<String, String> images, final Hotel item) {
    DatabaseReference itemsRef = FirebaseDatabase.getInstance().getReferenceFromUrl(Constants.FIREBASE_URL_ITEMS);
    itemsRef.keepSynced(true);
    item.setImagesUrls(images);
    itemsRef = itemsRef.push().getRef();

    itemsRef.setValue(item, new DatabaseReference.CompletionListener() {
        @Override
        public void onComplete(DatabaseError databaseError, DatabaseReference databaseReference) {
            mUploadProgressDialog.dismiss();
            if (databaseError == null) {
                Toast.makeText(AddActivity.this, "Item uploaded Successfully.", Toast.LENGTH_SHORT).show();
                startActivity(new Intent(AddActivity.this, MainActivity.class)
                        .addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP));
            } else {
                Toast.makeText(AddActivity.this, "unable to add.", Toast.LENGTH_SHORT).show();

            }
        }
    });
}
 

import com.google.firebase.database.DatabaseReference; //導入方法依賴的package包/類
@Test
public void testKeepSynced() throws Exception {
  DatabaseReference ref = IntegrationTestUtils.getRandomNode(masterApp);
  ref.keepSynced(true);
  assertIsKeptSynced(ref);

  ref.keepSynced(false);
  assertNotKeptSynced(ref);
}
 

import com.google.firebase.database.DatabaseReference; //導入方法依賴的package包/類
@Test
public void testKeepSyncedAffectOnQueries() throws Exception {
  DatabaseReference ref = IntegrationTestUtils.getRandomNode(masterApp);
  ref.keepSynced(true);
  Query query = ref.limitToFirst(5);
  query.keepSynced(true);
  assertIsKeptSynced(ref);

  ref.keepSynced(false);
  assertNotKeptSynced(ref);
  // currently, setting false on the default query affects all queries at that location
  assertNotKeptSynced(query);
}
 

import com.google.firebase.database.DatabaseReference; //導入方法依賴的package包/類
@Test
public void testKeptSyncedChild() throws Exception {
  DatabaseReference ref = IntegrationTestUtils.getRandomNode(masterApp);
  DatabaseReference child = ref.child("random-child");

  ref.keepSynced(true);
  try {
    assertIsKeptSynced(child);
  } finally {
    // cleanup
    ref.keepSynced(false);
  }
}
 

import com.google.firebase.database.DatabaseReference; //導入方法依賴的package包/類
@Test
public void testKeptSyncedRoot() throws Exception {
  DatabaseReference ref = FirebaseDatabase.getInstance().getReference();

  ref.keepSynced(true);
  try {
    assertIsKeptSynced(ref);
  } finally {
    // cleanup
    ref.keepSynced(false);
  }
}
 

import com.google.firebase.database.DatabaseReference; //導入方法依賴的package包/類
@Singleton
@Provides
DatabaseReference provideDatabaseReference(Context context, FirebaseDatabase firebaseDatabase) {
    DatabaseReference fontsRef = firebaseDatabase.getReference(
            context.getString(R.string.fonts));
    fontsRef.keepSynced(BuildConfig.DEBUG); //force sync on debug
    return firebaseDatabase.getReference(context.getString(R.string.fonts));
}