Can get older posts in latest posts fragment.

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

@@ -115,9 +115,24 @@ public class PostsHelper {
      */
     @Nullable
     public PostsList get_latest() {
+        return get_latest(-1);
+    }
+
+    /**
+     * Get the list of latest posts of a user
+     *
+     * @param from The ID of the newest post to start from (-1 to start from the newest post)
+     * @return The list of posts / null in case of failure
+     */
+    @Nullable
+    public PostsList get_latest(int from) {
         //Perform a request on the API
         APIRequest params = new APIRequest(mContext, "posts/get_latest");
 
+        //Check if we have to start from a precise post
+        if(from > 0)
+            params.addInt("startFrom", from);
+
         //Perform the request
         try {
 

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

@@ -19,6 +19,7 @@ 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.UserInfo;
 import org.communiquons.android.comunic.client.ui.activities.MainActivity;
+import org.communiquons.android.comunic.client.ui.listeners.OnPostListFragmentsUpdateListener;
 
 /**
  * Latest posts fragment
@@ -27,7 +28,8 @@ import org.communiquons.android.comunic.client.ui.activities.MainActivity;
  * Created by pierre on 5/10/18.
  */
 
-public class LatestPostsFragment extends Fragment {
+public class LatestPostsFragment extends Fragment
+        implements OnPostListFragmentsUpdateListener {
 
     /**
      * Debug tag
@@ -54,6 +56,11 @@ public class LatestPostsFragment extends Fragment {
      */
     ArrayMap<Integer, UserInfo> mUserInfo;
 
+    /**
+     * Fragment that displays the list of posts
+     */
+    private PostsListFragment mPostsListFragment;
+
     /**
      * Loading progress bar
      */
@@ -64,6 +71,11 @@ public class LatestPostsFragment extends Fragment {
      */
     TextView mNoPostNotice;
 
+    /**
+     * Posts load lock
+     */
+    private boolean mLoadPostsLock = false;
+
     @Override
     public void onStart() {
         super.onStart();
@@ -170,13 +182,14 @@ public class LatestPostsFragment extends Fragment {
 
         //Append the new posts list
         //Apply the post fragment
-        PostsListFragment postsListFragment = new PostsListFragment();
+        mPostsListFragment = new PostsListFragment();
-        postsListFragment.setPostsList(mPostsList);
+        mPostsListFragment.setPostsList(mPostsList);
-        postsListFragment.setUsersInfos(mUserInfo);
+        mPostsListFragment.setUsersInfos(mUserInfo);
+        mPostsListFragment.setOnPostListFragmentsUpdateListener(this);
 
         //Create and commit a transaction
         FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
-        transaction.replace(R.id.posts_list_target, postsListFragment);
+        transaction.replace(R.id.posts_list_target, mPostsListFragment);
         transaction.commit();
     }
 
@@ -197,4 +210,79 @@ public class LatestPostsFragment extends Fragment {
     private void toggleNoPostNoticeVisibility(boolean visible){
         mNoPostNotice.setVisibility(visible ? View.VISIBLE : View.GONE);
     }
+
+    @Override
+    public void onLoadMorePosts() {
+
+        //Check if post loading is already locked
+        if(mLoadPostsLock)
+            return;
+
+        if(mPostsList == null)
+            return;
+
+        if(mPostsList.size() == 0)
+            return;
+
+        //Display loading bar
+        mLoadPostsLock = true;
+        toggleLoadingBarVisibility(true);
+
+        //Get the ID of the oldest post to start from
+        final int start = mPostsList.get(mPostsList.size()-1).getId() - 1;
+
+        //Get older posts
+        new GetOlderPosts().executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, start);
+    }
+
+    /**
+     * This class get and apply older posts
+     */
+    private class GetOlderPosts extends AsyncTask<Integer, Void, PostsList> {
+
+        @Override
+        protected PostsList doInBackground(Integer... id) {
+
+            //Get the list of older posts
+            PostsList postsList = mPostsHelper.get_latest(id[0]);
+
+            //Check for errors
+            if(postsList == null)
+                return null;
+
+            //Merge posts list
+            mPostsList.addAll(postsList);
+
+            //Get information about the users
+            ArrayMap<Integer, UserInfo> usersInfo
+                    = mUserHelper.getMultiple(mPostsList.getUsersId());
+
+            //Check for errors
+            if(usersInfo == null)
+                return null;
+
+            //Save new user information
+            mUserInfo = usersInfo;
+
+            return postsList;
+        }
+
+        @Override
+        protected void onPostExecute(PostsList posts) {
+
+            //Check if the activity has been detached
+            if(getActivity() == null)
+                return;
+
+            //Unlock post loading
+            mLoadPostsLock = false;
+            toggleLoadingBarVisibility(false);
+
+            //Apply new posts list
+            mPostsListFragment.setPostsList(mPostsList);
+            mPostsListFragment.setUsersInfos(mUserInfo);
+            mPostsListFragment.show();
+
+        }
+    }
 }

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

@@ -15,7 +15,6 @@ import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.EditText;
-import android.widget.ListView;
 import android.widget.Toast;
 
 import org.communiquons.android.comunic.client.R;
@@ -32,8 +31,11 @@ import org.communiquons.android.comunic.client.data.helpers.PostsHelper;
 import org.communiquons.android.comunic.client.data.arrays.PostsList;
 import org.communiquons.android.comunic.client.data.utils.StringsUtils;
 import org.communiquons.android.comunic.client.ui.adapters.PostsAdapter;
+import org.communiquons.android.comunic.client.ui.listeners.OnPostListFragmentsUpdateListener;
+import org.communiquons.android.comunic.client.ui.listeners.OnScrollChangeDetectListener;
 import org.communiquons.android.comunic.client.ui.listeners.onPostUpdateListener;
 import org.communiquons.android.comunic.client.ui.views.EditCommentContentView;
+import org.communiquons.android.comunic.client.ui.views.ScrollListView;
 
 import java.util.ArrayList;
 
@@ -47,7 +49,7 @@ import java.util.ArrayList;
  */
 
 public class PostsListFragment extends Fragment
-    implements onPostUpdateListener {
+    implements onPostUpdateListener, OnScrollChangeDetectListener {
 
     /**
      * Menu action : no action
@@ -85,10 +87,15 @@ public class PostsListFragment extends Fragment
     PostsList mPostsList;
 
     /**
-     * Informations about the related users
+     * Information about the related users
      */
     ArrayMap<Integer, UserInfo> mUsersInfo;
 
+    /**
+     * Events listener
+     */
+    private OnPostListFragmentsUpdateListener onPostListFragmentsUpdateListener = null;
+
     /**
      * Post adapter
      */
@@ -97,14 +104,13 @@ public class PostsListFragment extends Fragment
     /**
      * The list of posts
      */
-    ListView mListView;
+    ScrollListView mListView;
 
     /**
      * Posts helper
      */
     PostsHelper mPostsHelper;
 
-
     /**
      * Comments helper
      */
@@ -167,6 +173,7 @@ public class PostsListFragment extends Fragment
 
         //Get the list view
         mListView = view.findViewById(R.id.posts_list);
+        mListView.setOnScrollChangeDetectListener(this);
 
         //Show the posts
         show();
@@ -670,4 +677,27 @@ public class PostsListFragment extends Fragment
 
         return super.onContextItemSelected(item);
     }
+
+    public OnPostListFragmentsUpdateListener getOnPostListFragmentsUpdateListener() {
+        return onPostListFragmentsUpdateListener;
+    }
+
+    public void setOnPostListFragmentsUpdateListener(
+            OnPostListFragmentsUpdateListener onPostListFragmentsUpdateListener) {
+        this.onPostListFragmentsUpdateListener = onPostListFragmentsUpdateListener;
+    }
+
+    @Override
+    public void onReachTop() {
+        //Nothing
+    }
+
+    @Override
+    public void onReachBottom() {
+
+        //Request more posts
+        if(onPostListFragmentsUpdateListener != null)
+            onPostListFragmentsUpdateListener.onLoadMorePosts();
+        
+    }
 }

app/src/main/java/org/communiquons/android/comunic/client/ui/listeners/OnPostListFragmentsUpdateListener.java

@@ -0,0 +1,16 @@
+package org.communiquons.android.comunic.client.ui.listeners;
+
+/**
+ * Posts list fragment update listener
+ *
+ * @author Pierre HUBERT
+ */
+
+public interface OnPostListFragmentsUpdateListener {
+
+    /**
+     * This method is triggered when the user request to load more posts
+     */
+    void onLoadMorePosts();
+
+}

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

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<ListView android:id="@+id/posts_list"
+<org.communiquons.android.comunic.client.ui.views.ScrollListView android:id="@+id/posts_list"
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"