Improved user posts fragment

app/src/main/java/org/communiquons/android/comunic/client/data/helpers/PostsHelper.java

@@ -89,11 +89,26 @@ public class PostsHelper {
      */
     @Nullable
     public PostsList get_user(int userID){
+        return get_user(userID, -1);
+    }
+
+    /**
+     * Get the list of the posts of a user
+     *
+     * @param userID The ID of the user to get the post from
+     * @param from The post to start from (-1 not to specify)
+     * @return The list of posts / null in case of failure
+     */
+    @Nullable
+    public PostsList get_user(int userID, int from){
 
         //Perform a request on the API
         APIRequest params = new APIRequest(mContext, "posts/get_user");
         params.addInt("userID", userID);
 
+        if(from > -1)
+            params.addInt("startFrom", from);
+
         //Perform the request
         try {
 

app/src/main/java/org/communiquons/android/comunic/client/ui/asynctasks/LoadUserPostsTask.java

@@ -12,7 +12,7 @@ import org.communiquons.android.comunic.client.data.helpers.PostsHelper;
  *
  * @author Pierre HUBERT
  */
-public class LoadUserPostsTask extends SafeAsyncTask<Void, Void, PostsList> {
+public class LoadUserPostsTask extends SafeAsyncTask<Integer, Void, PostsList> {
 
     private int mUserID;
 
@@ -29,8 +29,14 @@ public class LoadUserPostsTask extends SafeAsyncTask<Void, Void, PostsList> {
     }
 
     @Override
-    protected PostsList doInBackground(Void... voids) {
+    protected PostsList doInBackground(Integer ...integers) {
-        PostsList list = new PostsHelper(getContext()).get_user(mUserID);
+
+        PostsList list;
+
+        if(integers.length == 0)
+            list = new PostsHelper(getContext()).get_user(mUserID);
+        else
+            list = new PostsHelper(getContext()).get_user(mUserID, integers[0]);
 
         //Get associated user information, if possible
         if(list != null)

app/src/main/java/org/communiquons/android/comunic/client/ui/fragments/UserPostsFragment.java

@@ -12,16 +12,16 @@ import android.view.View;
 import android.view.ViewGroup;
 import android.widget.Button;
 import android.widget.FrameLayout;
+import android.widget.ProgressBar;
 import android.widget.TextView;
 import android.widget.Toast;
 
 import org.communiquons.android.comunic.client.R;
 import org.communiquons.android.comunic.client.data.arrays.PostsList;
 import org.communiquons.android.comunic.client.data.asynctasks.SafeAsyncTask;
-import org.communiquons.android.comunic.client.data.helpers.GetUsersHelper;
-import org.communiquons.android.comunic.client.data.helpers.PostsHelper;
 import org.communiquons.android.comunic.client.data.models.Post;
 import org.communiquons.android.comunic.client.ui.asynctasks.LoadUserPostsTask;
+import org.communiquons.android.comunic.client.ui.listeners.OnPostListFragmentsUpdateListener;
 
 /**
  * User posts fragment
@@ -29,7 +29,7 @@ import org.communiquons.android.comunic.client.ui.asynctasks.LoadUserPostsTask;
  * @author Pierre HUBERT
  */
 public class UserPostsFragment extends Fragment
-    implements PostsCreateFormFragment.OnPostCreated {
+    implements PostsCreateFormFragment.OnPostCreated, OnPostListFragmentsUpdateListener {
 
     /**
      * Bundle arguments
@@ -52,16 +52,6 @@ public class UserPostsFragment extends Fragment
      */
     private PostsList mPostsList;
 
-    /**
-     * Posts helper
-     */
-    private PostsHelper mPostsHelper;
-
-    /**
-     * User information helper
-     */
-    private GetUsersHelper mUserHelper;
-
     /**
      * Create post button
      */
@@ -87,6 +77,11 @@ public class UserPostsFragment extends Fragment
      */
     private PostsListFragment mPostsListFragment;
 
+    /**
+     * Loading bar
+     */
+    private ProgressBar mProgressBar;
+
     @Override
     public void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -109,11 +104,11 @@ public class UserPostsFragment extends Fragment
     public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
         super.onViewCreated(view, savedInstanceState);
 
-
         //Get the views
         mCreatePostButton = view.findViewById(R.id.create_post_btn);
         mCreatePostLayout = view.findViewById(R.id.create_posts_form_target);
         mNoPostNotice = view.findViewById(R.id.no_post_notice);
+        mProgressBar = view.findViewById(R.id.progressBar);
 
         setNoPostNoticeVisibility(false);
 
@@ -125,11 +120,6 @@ public class UserPostsFragment extends Fragment
             }
         });
 
-        //Initialize helpers
-        assert getActivity() != null;
-        mPostsHelper = new PostsHelper(getActivity());
-        mUserHelper = new GetUsersHelper(getActivity());
-
         //Add create post fragment, if possible
         if(mCanPostsText)
             init_create_post_fragment();
@@ -137,7 +127,7 @@ public class UserPostsFragment extends Fragment
             mCreatePostButton.setVisibility(View.GONE);
 
         //Load user posts
-        mPostsList = new PostsList();
+        mPostsList = null;
         load_posts();
     }
 
@@ -147,12 +137,30 @@ public class UserPostsFragment extends Fragment
         cancel_load_task();
     }
 
+    private void cancel_load_task(){
+        if(mLoadUserPostsTask != null)
+            mLoadUserPostsTask.setOnPostExecuteListener(null);
+    }
+
+    /**
+     * Check whether some posts are loading or not
+     *
+     * @return TRUE or FALSE
+     */
+    private boolean is_loading_posts(){
+        return  mLoadUserPostsTask != null
+                && !mLoadUserPostsTask.isCancelled()
+                && mLoadUserPostsTask.hasOnPostExecuteListener()
+                && mLoadUserPostsTask.getStatus() != AsyncTask.Status.FINISHED;
+    }
+
     /**
      * Load user posts
      */
     private void load_posts(){
 
         cancel_load_task();
+        setProgressBarVisibility(true);
 
         mLoadUserPostsTask = new LoadUserPostsTask(mUserID, getActivity());
         mLoadUserPostsTask.setOnPostExecuteListener(new SafeAsyncTask.OnPostExecuteListener<PostsList>() {
@@ -168,19 +176,13 @@ public class UserPostsFragment extends Fragment
 
     }
 
-    private void cancel_load_task(){
-        if(mLoadUserPostsTask != null)
-            mLoadUserPostsTask.setOnPostExecuteListener(null);
-    }
-
     /**
      * Apply the list of posts
      */
     @UiThread
     private void apply_posts(@Nullable PostsList posts){
 
-        if(mPostsList == null)
+        setProgressBarVisibility(false);
-            return;
 
         if(isStateSaved())
             return;
@@ -197,14 +199,11 @@ public class UserPostsFragment extends Fragment
             return;
         }
 
-        //Merge post information with existing one
-        mPostsList.addAll(posts);
-        assert mPostsList.getUsersInfo() != null;
-        mPostsList.getUsersInfo().putAll(posts.getUsersInfo());
-
         //Create fragment if required
         if(mPostsListFragment == null){
             mPostsListFragment = new PostsListFragment();
+            mPostsListFragment.setPostsList(mPostsList);
+            mPostsListFragment.setOnPostListFragmentsUpdateListener(this);
 
             FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
             transaction.replace(R.id.posts_list_target, mPostsListFragment);
@@ -212,9 +211,20 @@ public class UserPostsFragment extends Fragment
         }
 
 
-        mPostsListFragment.setPostsList(mPostsList);
+        if(mPostsList != null){
-        mPostsListFragment.show();
 
+            //Merge post information with existing one
+            mPostsList.addAll(posts);
+            assert mPostsList.getUsersInfo() != null;
+            mPostsList.getUsersInfo().putAll(posts.getUsersInfo());
+        }
+        else {
+            mPostsList = posts;
+            mPostsListFragment.setPostsList(mPostsList);
+        }
+
+
+        mPostsListFragment.show();
 
         setNoPostNoticeVisibility(mPostsList.size() < 1);
     }
@@ -247,6 +257,15 @@ public class UserPostsFragment extends Fragment
         setPostFormVisibility(false);
     }
 
+    /**
+     * Update progress bar visibility
+     *
+     * @param visibility TRUE for visible / FALSE else
+     */
+    private void setProgressBarVisibility(boolean visibility){
+        mProgressBar.setVisibility(visibility ? View.VISIBLE : View.GONE);
+    }
+
     /**
      * Update post creation form visibility
      *
@@ -263,8 +282,34 @@ public class UserPostsFragment extends Fragment
 
     @Override
     public void onPostCreated(Post post) {
-        mPostsList = new PostsList();
+        mPostsList = null;
         load_posts();
         init_create_post_fragment();
     }
+
+    @Override
+    public void onLoadMorePosts() {
+
+        if(mPostsList == null)
+            return;
+
+        if(mPostsList.size() < 1)
+            return;
+
+        if(is_loading_posts())
+            return;
+
+        setProgressBarVisibility(true);
+
+        mLoadUserPostsTask = new LoadUserPostsTask(mUserID, getActivity());
+        mLoadUserPostsTask.setOnPostExecuteListener(new SafeAsyncTask.OnPostExecuteListener<PostsList>() {
+            @Override
+            public void OnPostExecute(PostsList posts) {
+                apply_posts(posts);
+            }
+        });
+        mLoadUserPostsTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR,
+                mPostsList.get(mPostsList.size() -1).getId() -1);
+
+    }
 }

app/src/main/res/layout/fragment_postswithform.xml

@@ -1,15 +1,21 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <LinearLayout
+        android:id="@+id/linearLayout2"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-    xmlns:tools="http://schemas.android.com/tools"
         android:orientation="vertical">
 
         <Button
             android:id="@+id/create_post_btn"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-        android:text="@string/action_create_post"/>
+            android:text="@string/action_create_post" />
 
         <!-- Posts form target -->
         <FrameLayout
@@ -23,9 +29,9 @@
             android:id="@+id/no_post_notice"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
-        android:text="@string/notice_no_post_user_page"
             android:layout_gravity="center"
-        android:layout_marginTop="10dp"/>
+            android:layout_marginTop="10dp"
+            android:text="@string/notice_no_post_user_page" />
 
         <!-- Posts target -->
         <FrameLayout
@@ -33,6 +39,22 @@
             android:layout_width="match_parent"
             android:layout_height="0dp"
             android:layout_weight="1"
-        tools:layout="@layout/fragment_postslist"/>
+            tools:layout="@layout/fragment_postslist" />
 
-</LinearLayout>
+    </LinearLayout>
+
+    <ProgressBar
+        android:id="@+id/progressBar"
+        style="?android:attr/progressBarStyle"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="8dp"
+        android:layout_marginEnd="8dp"
+        android:layout_marginStart="8dp"
+        android:layout_marginTop="8dp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="@+id/linearLayout2"
+        app:layout_constraintTop_toTopOf="parent" />
+
+</android.support.constraint.ConstraintLayout>