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Fix pull to refresh in DiscoverFragment

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This commit is contained in:
Ammar Githam 2020-09-05 17:31:50 +09:00
parent 3c90eebe7a
commit 48b76c231a
1 changed files with 40 additions and 35 deletions
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75
app/src/main/java/awais/instagrabber/fragments/main/DiscoverFragment.java
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@ -20,10 +20,10 @@ import androidx.fragment.app.Fragment;
import androidx.lifecycle.ViewModelProvider;
import androidx.navigation.NavDirections;
import androidx.navigation.fragment.NavHostFragment;
import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import awais.instagrabber.R;
@ -43,7 +43,7 @@ import awais.instagrabber.models.DiscoverTopicModel;
import awais.instagrabber.models.enums.DownloadMethod;
import awais.instagrabber.utils.Utils;
public class DiscoverFragment extends Fragment {
public class DiscoverFragment extends Fragment implements SwipeRefreshLayout.OnRefreshListener {
private MainActivity fragmentActivity;
private CoordinatorLayout root;
@ -58,6 +58,7 @@ public class DiscoverFragment extends Fragment {
private ActionMode actionMode;
private DiscoverItemViewModel discoverItemViewModel;
private boolean shouldRefresh = true;
private boolean isPullToRefresh;
private final FetchListener<DiscoverTopicModel> topicFetchListener = new FetchListener<DiscoverTopicModel>() {
@Override
@ -77,28 +78,28 @@ public class DiscoverFragment extends Fragment {
}
}
};
private final FetchListener<DiscoverItemModel[]> discoverFetchListener = new FetchListener<DiscoverItemModel[]>() {
private final FetchListener<DiscoverItemModel[]> postsFetchListener = new FetchListener<DiscoverItemModel[]>() {
@Override
public void doBefore() {
binding.discoverSwipeRefreshLayout.setRefreshing(true);
}
public void doBefore() {}
@Override
public void onResult(final DiscoverItemModel[] result) {
binding.discoverSwipeRefreshLayout.setRefreshing(false);
if (result == null || result.length == 0) {
if (result == null || result.length <= 0) {
binding.discoverSwipeRefreshLayout.setRefreshing(false);
Toast.makeText(requireContext(), R.string.discover_empty, Toast.LENGTH_SHORT).show();
return;
}
final List<DiscoverItemModel> current = discoverItemViewModel.getList().getValue();
List<DiscoverItemModel> current = discoverItemViewModel.getList().getValue();
final List<DiscoverItemModel> resultList = Arrays.asList(result);
if (current == null) {
discoverItemViewModel.getList().postValue(resultList);
current = current == null ? new ArrayList<>() : new ArrayList<>(current); // copy to modifiable list
if (isPullToRefresh) {
current = resultList;
isPullToRefresh = false;
} else {
final List<DiscoverItemModel> currentCopy = new ArrayList<>(current);
currentCopy.addAll(resultList);
discoverItemViewModel.getList().postValue(currentCopy);
current.addAll(resultList);
}
discoverItemViewModel.getList().postValue(current);
binding.discoverSwipeRefreshLayout.setRefreshing(false);
final DiscoverItemModel discoverItemModel = result[result.length - 1];
if (discoverItemModel != null) {
discoverEndMaxId = discoverItemModel.getNextMaxId();
@ -161,39 +162,35 @@ public class DiscoverFragment extends Fragment {
@Override
public void onViewCreated(@NonNull final View view, @Nullable final Bundle savedInstanceState) {
if (!shouldRefresh) return;
binding.discoverSwipeRefreshLayout.setOnRefreshListener(this);
setupExplore();
shouldRefresh = false;
}
@Override
public void onRefresh() {
isPullToRefresh = true;
discoverEndMaxId = null;
lazyLoader.resetState();
fetchPosts();
}
private void setupExplore() {
discoverItemViewModel = new ViewModelProvider(fragmentActivity).get(DiscoverItemViewModel.class);
final GridAutofitLayoutManager layoutManager = new GridAutofitLayoutManager(requireContext(), Utils.convertDpToPx(110));
binding.discoverPosts.setLayoutManager(layoutManager);
binding.discoverPosts.addItemDecoration(new GridSpacingItemDecoration(Utils.convertDpToPx(4)));
new iTopicFetcher(topicFetchListener).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
binding.discoverType.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
if (topicIds != null) {
currentTopic = topicIds[pos];
binding.discoverSwipeRefreshLayout.setRefreshing(true);
if (lazyLoader != null) lazyLoader.resetState();
discoverItemViewModel.getList().postValue(Collections.emptyList());
new DiscoverFetcher(currentTopic, null, rankToken, discoverFetchListener, false)
.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
}
if (topicIds == null || topicIds.length <= 0) return;
currentTopic = topicIds[pos];
onRefresh();
}
@Override
public void onNothingSelected(AdapterView<?> parent) {}
});
binding.discoverSwipeRefreshLayout.setOnRefreshListener(() -> {
lazyLoader.resetState();
discoverItemViewModel.getList().postValue(Collections.emptyList());
new DiscoverFetcher(currentTopic, null, rankToken, discoverFetchListener, false).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
});
discoverAdapter = new DiscoverAdapter((model, position) -> {
if (discoverAdapter.isSelecting()) {
if (actionMode == null) return;
@ -236,13 +233,21 @@ public class DiscoverFragment extends Fragment {
discoverItemViewModel.getList().observe(fragmentActivity, discoverAdapter::submitList);
lazyLoader = new RecyclerLazyLoader(layoutManager, (page, totalItemsCount) -> {
if (discoverHasMore) {
binding.discoverSwipeRefreshLayout.setRefreshing(true);
new DiscoverFetcher(currentTopic, discoverEndMaxId, rankToken, discoverFetchListener, false)
.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
discoverEndMaxId = null;
fetchPosts();
}
});
}, 3);
binding.discoverPosts.addOnScrollListener(lazyLoader);
fetchTopics();
}
private void fetchTopics() {
new iTopicFetcher(topicFetchListener).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
}
private void fetchPosts() {
binding.discoverSwipeRefreshLayout.setRefreshing(true);
new DiscoverFetcher(currentTopic, discoverEndMaxId, rankToken, postsFetchListener, false)
.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
}
private boolean checkAndResetAction() {