L18: Step 7. Make the RecyclerView Adapter work with a PagedList

AOrobator · Apr 5, 2019 · d59eb74 · d59eb74
1 parent 32da265
commit d59eb74
Show file tree

Hide file tree

Showing 3 changed files with 16 additions and 3 deletions.
diff --git a/lesson18/Lesson18_Paging.md b/lesson18/Lesson18_Paging.md
@@ -201,6 +201,18 @@ In `GithubRepository.search()` method, make the following changes:
        return new RepoSearchResult(data, networkErrors);
    }
    ```
+
+## 7. Make the RecyclerView Adapter work with a PagedList
+To bind a `PagedList` to a `RecycleView`, use a [PagedListAdapter]. The `PagedListAdapter` gets 
+notified whenever the `PagedList` content is loaded and then signals the `RecyclerView` to update.
+
+**Update the `ReposAdapter` to work with a `PagedList`:**
+
+ * Right now, `ReposAdapter` is a `ListAdapter`. Make it a `PagedListAdapter`:
+   ```java
+   class ReposAdapter extends PagedListAdapter<Repo, RecyclerView.ViewHolder>
+   ```
+Our app finally compiles! Run it, and check out how it works.
 
 [Paging library]: https://developer.android.com/topic/libraries/architecture/paging
 [Paging Codelab]: https://codelabs.developers.google.com/codelabs/android-paging/index.html

diff --git a/lesson18/src/main/java/com/orobator/helloandroid/lesson18/ui/ReposAdapter.java b/lesson18/src/main/java/com/orobator/helloandroid/lesson18/ui/ReposAdapter.java
@@ -2,15 +2,15 @@
 
 import android.view.ViewGroup;
 import androidx.annotation.NonNull;
+import androidx.paging.PagedListAdapter;
 import androidx.recyclerview.widget.DiffUtil;
-import androidx.recyclerview.widget.ListAdapter;
 import androidx.recyclerview.widget.RecyclerView;
 import com.orobator.helloandroid.lesson18.model.Repo;
 
 /**
  * Adapter for the list of repositories
  */
-class ReposAdapter extends ListAdapter<Repo, RecyclerView.ViewHolder> {
+class ReposAdapter extends PagedListAdapter<Repo, RecyclerView.ViewHolder> {
   private static final DiffUtil.ItemCallback<Repo> REPO_COMPARATOR =
       new DiffUtil.ItemCallback<Repo>() {
         @Override public boolean areItemsTheSame(@NonNull Repo oldItem, @NonNull Repo newItem) {

diff --git a/lesson18/src/main/java/com/orobator/helloandroid/lesson18/ui/SearchRepositoriesActivity.java b/lesson18/src/main/java/com/orobator/helloandroid/lesson18/ui/SearchRepositoriesActivity.java
@@ -70,7 +70,7 @@ private void initAdapter() {
       if (repos != null) {
         size = repos.size();
       }
-      Log.d("Activity", "list: " + size + "");
+      Log.d(SearchRepositoriesActivity.class.getSimpleName(), "list: " + size + "");
       showEmptyList(size == 0);
       adapter.submitList(repos);
     });
@@ -106,6 +106,7 @@ private void initSearch(String query) {
   private void updateRepoListFromInput() {
     String input = searchRepoEditText.getText().toString().trim();
     if (!TextUtils.isEmpty(input)) {
+      Log.d(SearchRepositoriesActivity.class.getSimpleName(), "Got input: " + input);
       list.scrollToPosition(0);
       viewModel.searchRepo(input);
       adapter.submitList(null);