Use withLoadStateFooter to show load state.

3 files changed, 146 insertions, 2 deletions

diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/adapters/Paging3LoadingStateAdapter.java b/app/src/main/java/ml/docilealligator/infinityforreddit/adapters/Paging3LoadingStateAdapter.java
new file mode 100644
index 00000000..e23dc4dd
--- /dev/null
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/adapters/Paging3LoadingStateAdapter.java
@@ -0,0 +1,72 @@
+package ml.docilealligator.infinityforreddit.adapters;
+
+import android.util.Log;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Button;
+import android.widget.ProgressBar;
+import android.widget.RelativeLayout;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.paging.LoadState;
+import androidx.paging.LoadStateAdapter;
+import androidx.recyclerview.widget.RecyclerView;
+
+import ml.docilealligator.infinityforreddit.R;
+import ml.docilealligator.infinityforreddit.customtheme.CustomThemeWrapper;
+
+public class Paging3LoadingStateAdapter extends LoadStateAdapter<Paging3LoadingStateAdapter.LoadStateViewHolder> {
+    private CustomThemeWrapper mCustomThemeWrapper;
+    private int mErrorStringId;
+    private View.OnClickListener mRetryCallback;
+
+    public Paging3LoadingStateAdapter(CustomThemeWrapper customThemeWrapper, int errorStringId, View.OnClickListener retryCallback) {
+        this.mCustomThemeWrapper = customThemeWrapper;
+        this.mErrorStringId = errorStringId;
+        this.mRetryCallback = retryCallback;
+    }
+
+    @Override
+    public void onBindViewHolder(@NonNull LoadStateViewHolder loadStateViewHolder, @NonNull LoadState loadState) {
+        loadStateViewHolder.bind(loadState);
+    }
+
+    @NonNull
+    @Override
+    public LoadStateViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, @NonNull LoadState loadState) {
+        return new LoadStateViewHolder(LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item_paging_3_load_state, viewGroup, false), mRetryCallback);
+    }
+
+    class LoadStateViewHolder extends RecyclerView.ViewHolder {
+        private ProgressBar mProgressBar;
+        private RelativeLayout mErrorView;
+        private TextView mErrorMsg;
+        private Button mRetry;
+
+        LoadStateViewHolder(@NonNull View itemView, @NonNull View.OnClickListener retryCallback) {
+            super(itemView);
+
+            mProgressBar = itemView.findViewById(R.id.progress_bar_item_paging_3_load_state);
+            mErrorView = itemView.findViewById(R.id.error_view_relative_layout_item_paging_3_load_state);
+            mErrorMsg = itemView.findViewById(R.id.error_text_view_item_paging_3_load_state);
+            mRetry = itemView.findViewById(R.id.retry_button_item_paging_3_load_state);
+
+            mErrorMsg.setText(mErrorStringId);
+            mErrorMsg.setTextColor(mCustomThemeWrapper.getPrimaryTextColor());
+            mRetry.setOnClickListener(retryCallback);
+            mErrorView.setOnClickListener(retryCallback);
+
+            Log.i("asfasdf", "asdf ");
+        }
+
+        public void bind(LoadState loadState) {
+            Log.i("asfasdf", "asdf bind");
+            mProgressBar.setVisibility(loadState instanceof LoadState.Loading
+                    ? View.VISIBLE : View.GONE);
+            mErrorView.setVisibility(loadState instanceof LoadState.Error
+                    ? View.VISIBLE : View.GONE);
+        }
+    }
+}
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/fragments/PostFragment.java b/app/src/main/java/ml/docilealligator/infinityforreddit/fragments/PostFragment.java
index f4ed088a..48a39e41 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/fragments/PostFragment.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/fragments/PostFragment.java
@@ -37,6 +37,7 @@ import androidx.appcompat.app.AppCompatActivity;
 import androidx.core.content.res.ResourcesCompat;
 import androidx.fragment.app.Fragment;
 import androidx.lifecycle.ViewModelProvider;
+import androidx.paging.LoadState;
 import androidx.recyclerview.widget.ItemTouchHelper;
 import androidx.recyclerview.widget.LinearSmoothScroller;
 import androidx.recyclerview.widget.RecyclerView;
@@ -78,6 +79,7 @@ import ml.docilealligator.infinityforreddit.SortType;
 import ml.docilealligator.infinityforreddit.activities.BaseActivity;
 import ml.docilealligator.infinityforreddit.activities.FilteredPostsActivity;
 import ml.docilealligator.infinityforreddit.activities.ViewSubredditDetailActivity;
+import ml.docilealligator.infinityforreddit.adapters.Paging3LoadingStateAdapter;
 import ml.docilealligator.infinityforreddit.adapters.PostRecyclerViewAdapter;
 import ml.docilealligator.infinityforreddit.asynctasks.LoadSubredditIcon;
 import ml.docilealligator.infinityforreddit.asynctasks.LoadUserData;
@@ -214,6 +216,7 @@ public class PostFragment extends Fragment implements FragmentCommunicator {
     private boolean isLazyModePaused = false;
     private boolean hasPost = false;
     private boolean isShown = false;
+    private boolean isInitialRefreshingStarted = false;
     private boolean savePostFeedScrolledPosition;
     private boolean rememberMutingOptionInPostFeed;
     private Boolean masterMutingOption;
@@ -257,8 +260,8 @@ public class PostFragment extends Fragment implements FragmentCommunicator {
     public void onResume() {
         super.onResume();
         isShown = true;
-        if (mPostRecyclerView.getAdapter() != null) {
-            ((PostRecyclerViewAdapter) mPostRecyclerView.getAdapter()).setCanStartActivity(true);
+        if (mAdapter != null) {
+            mAdapter.setCanStartActivity(true);
         }
         if (isInLazyMode) {
             resumeLazyMode(false);
@@ -1179,6 +1182,30 @@ public class PostFragment extends Fragment implements FragmentCommunicator {
     private void bindPostViewModel() {
         mPostViewModel.getPosts().observe(getViewLifecycleOwner(), posts -> mAdapter.submitData(getViewLifecycleOwner().getLifecycle(), posts));
 
+        mAdapter.addLoadStateListener(combinedLoadStates -> {
+            LoadState refreshLoadState = combinedLoadStates.getRefresh();
+            LoadState appendLoadState = combinedLoadStates.getAppend();
+
+            mSwipeRefreshLayout.setRefreshing(refreshLoadState instanceof LoadState.Loading);
+            if (refreshLoadState instanceof LoadState.NotLoading) {
+                if (refreshLoadState.getEndOfPaginationReached() && mAdapter.getItemCount() < 1) {
+                    if (isInLazyMode) {
+                        stopLazyMode();
+                    }
+
+                    mFetchPostInfoLinearLayout.setOnClickListener(null);
+                    showErrorView(R.string.no_posts);
+                }
+            } else if (refreshLoadState instanceof LoadState.Error) {
+                mFetchPostInfoLinearLayout.setOnClickListener(view -> refresh());
+                showErrorView(R.string.load_posts_error);
+            }
+            return null;
+        });
+
+        mPostRecyclerView.setAdapter(mAdapter.withLoadStateFooter(new Paging3LoadingStateAdapter(mCustomThemeWrapper, R.string.load_more_posts_error,
+                view -> mAdapter.retry())));
+
         /*mPostViewModel.hasPost().observe(getViewLifecycleOwner(), hasPost -> {
             this.hasPost = hasPost;
             mSwipeRefreshLayout.setRefreshing(false);
diff --git a/app/src/main/res/layout/item_paging_3_load_state.xml b/app/src/main/res/layout/item_paging_3_load_state.xml
new file mode 100644
index 00000000..321b8e14
--- /dev/null
+++ b/app/src/main/res/layout/item_paging_3_load_state.xml
@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content">
+
+    <ProgressBar
+        android:id="@+id/progress_bar_item_paging_3_load_state"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:layout_marginTop="8dp"
+        android:layout_marginBottom="16dp" />
+
+    <RelativeLayout
+        android:id="@+id/error_view_relative_layout_item_paging_3_load_state"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="16dp"
+        android:layout_marginTop="8dp"
+        android:layout_marginEnd="16dp"
+        android:layout_marginBottom="16dp">
+
+        <TextView
+            android:id="@+id/error_text_view_item_paging_3_load_state"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_alignParentStart="true"
+            android:layout_centerVertical="true"
+            android:layout_toStartOf="@id/retry_button_item_paging_3_load_state"
+            android:textSize="?attr/font_18"
+            android:fontFamily="?attr/font_family" />
+
+        <Button
+            android:id="@+id/retry_button_item_paging_3_load_state"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_alignParentEnd="true"
+            android:layout_centerVertical="true"
+            android:text="@string/retry"
+            android:textSize="?attr/font_default"
+            android:fontFamily="?attr/font_family" />
+
+    </RelativeLayout>
+
+</FrameLayout>
\ No newline at end of file