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Code Issues Projects Releases Wiki Activity

Improved the way posts are retrieved on LatestPostsFragment

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This commit is contained in:
Pierre HUBERT 2018-08-31 11:10:56 +02:00
parent 5f9d58f811
commit 4c36303ff9
3 changed files with 159 additions and 141 deletions
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9
app/src/main/java/org/communiquons/android/comunic/client/data/asynctasks/SafeAsyncTask.java
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@ -50,6 +50,15 @@ public abstract class SafeAsyncTask<Params, Progress, Result>
this.onPostExecuteListener = onPostExecuteListener;
}
/**
* Check whether the a OnPostExecuteListener has been set or not
*
* @return TRUE if it has been set / FALSE else
*/
public boolean hasOnPostExecuteListener(){
return this.onPostExecuteListener != null;
}
@Override
protected void onPostExecute(Result result) {
super.onPostExecute(result);

34
app/src/main/java/org/communiquons/android/comunic/client/ui/asynctasks/GetLatestPostsTask.java Normal file
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@ -0,0 +1,34 @@
package org.communiquons.android.comunic.client.ui.asynctasks;
import android.content.Context;
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;
/**
* Get latest posts task
*
* @author Pierre HUBERT
*/
public class GetLatestPostsTask extends SafeAsyncTask<Integer, Void, PostsList> {
public GetLatestPostsTask(Context context) {
super(context);
}
@Override
protected PostsList doInBackground(Integer... integers) {
//Get the list of posts
int from = integers[0] == 0 ? -1 : integers[0];
PostsList list = new PostsHelper(getContext()).get_latest(from);
if(list == null) return null;
list.setUsersInfo(new GetUsersHelper(getContext()).getMultiple(list.getUsersId()));
if(!list.hasUsersInfo()) return null;
return list;
}
}

243
app/src/main/java/org/communiquons/android/comunic/client/ui/fragments/LatestPostsFragment.java
View File

@ -16,10 +16,12 @@ 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.UserInfo;
import org.communiquons.android.comunic.client.ui.activities.MainActivity;
import org.communiquons.android.comunic.client.ui.asynctasks.GetLatestPostsTask;
import org.communiquons.android.comunic.client.ui.listeners.OnPostListFragmentsUpdateListener;
/**
@ -37,27 +39,21 @@ public class LatestPostsFragment extends Fragment
*/
private static final String TAG = "LatestPostsFragment";
/**
* Posts helper
*/
PostsHelper mPostsHelper;
/**
* User information helper
*/
GetUsersHelper mUserHelper;
/**
* The list of posts
*/
PostsList mPostsList;
/**
* Fragment that displays the list of posts
*/
private PostsListFragment mPostsListFragment;
/**
* Load posts task
*/
private GetLatestPostsTask mGetLatestPostsTask;
/**
* Loading progress bar
*/
@ -68,21 +64,6 @@ public class LatestPostsFragment extends Fragment
*/
TextView mNoPostNotice;
/**
* Posts load lock
*/
private boolean mLoadPostsLock = false;
@Override
public void onStart() {
super.onStart();
//Create posts helper
mPostsHelper = new PostsHelper(getActivity());
//Create user helper
mUserHelper = new GetUsersHelper(getActivity());
}
@Nullable
@Override
@ -110,6 +91,45 @@ public class LatestPostsFragment extends Fragment
//Refresh the list of posts of the user
if(mPostsList == null)
refresh_posts_list();
else {
mPostsListFragment = null;
show_posts_list();
}
}
@Override
public void onStop() {
super.onStop();
unset_all_load_tasks();
}
@Override
public void onSaveInstanceState(@NonNull Bundle outState) {
super.onSaveInstanceState(outState);
unset_all_load_tasks();
}
/**
* Unset all pending load tasks
*/
private void unset_all_load_tasks(){
if(mGetLatestPostsTask != null)
mGetLatestPostsTask.setOnPostExecuteListener(null);
}
/**
* Check whether are being loaded now or not
*
* @return TRUE if some posts are loading / FALSE else
*/
private boolean is_loading_posts() {
return mGetLatestPostsTask != null &&
mGetLatestPostsTask.hasOnPostExecuteListener() &&
!mGetLatestPostsTask.isCancelled() &&
mGetLatestPostsTask.getStatus() != AsyncTask.Status.FINISHED;
}
/**
@ -122,29 +142,15 @@ public class LatestPostsFragment extends Fragment
toggleNoPostNoticeVisibility(false);
//Get the list of latest posts
new AsyncTask<Void, Void, PostsList>(){
unset_all_load_tasks();
mGetLatestPostsTask = new GetLatestPostsTask(getActivity());
mGetLatestPostsTask.setOnPostExecuteListener(new SafeAsyncTask.OnPostExecuteListener<PostsList>() {
@Override
protected PostsList doInBackground(Void... params) {
PostsList postsList = mPostsHelper.get_latest();
//Get user information, if possible
if(postsList != null)
postsList.setUsersInfo(mUserHelper.getMultiple(postsList.getUsersId()));
return postsList;
}
@Override
protected void onPostExecute(PostsList posts) {
//Check if the activity still exists or not
if(getActivity() == null)
return;
public void OnPostExecute(PostsList posts) {
on_got_new_posts_list(posts);
}
}.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
});
mGetLatestPostsTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, 0);
}
/**
@ -152,30 +158,43 @@ public class LatestPostsFragment extends Fragment
*
* @param list The new list of posts
*/
private void on_got_new_posts_list(@Nullable PostsList list){
private void on_got_new_posts_list(@Nullable PostsList list) {
//Hide loading bar
toggleLoadingBarVisibility(false);
//Check for errors
if(list == null){
if (list == null) {
Toast.makeText(getActivity(), R.string.err_get_latest_posts, Toast.LENGTH_SHORT).show();
return;
}
if(!list.hasUsersInfo()){
if (!list.hasUsersInfo()) {
Toast.makeText(getActivity(), R.string.err_get_users_info, Toast.LENGTH_SHORT).show();
return;
}
//Save the list of posts
if (mPostsList == null)
mPostsList = list;
else {
mPostsList.addAll(list);
assert mPostsList.getUsersInfo() != null;
mPostsList.getUsersInfo().putAll(list.getUsersInfo());
}
//Check if the posts list is empty
if(mPostsList.size() == 0)
toggleNoPostNoticeVisibility(true);
show_posts_list();
}
/**
* Show posts list
*/
private void show_posts_list(){
//Hide loading bar
toggleLoadingBarVisibility(false);
if(mPostsListFragment == null){
//Append the new posts list
//Apply the post fragment
mPostsListFragment = new PostsListFragment();
mPostsListFragment.setPostsList(mPostsList);
@ -186,6 +205,43 @@ public class LatestPostsFragment extends Fragment
transaction.replace(R.id.posts_list_target, mPostsListFragment);
transaction.commit();
}
else
//Append the new posts list
mPostsListFragment.show();
//Check if the posts list is empty
toggleNoPostNoticeVisibility(mPostsList.size() == 0);
}
@Override
public void onLoadMorePosts() {
//Check if post loading is already locked
if(is_loading_posts())
return;
if(mPostsList == null)
return;
if(mPostsList.size() == 0)
return;
//Display loading bar
toggleLoadingBarVisibility(true);
//Get the ID of the oldest post to start from
int start = mPostsList.get(mPostsList.size()-1).getId() - 1;
//Get older posts
mGetLatestPostsTask = new GetLatestPostsTask(getActivity());
mGetLatestPostsTask.setOnPostExecuteListener(new SafeAsyncTask.OnPostExecuteListener<PostsList>() {
@Override
public void OnPostExecute(PostsList posts) {
on_got_new_posts_list(posts);
}
});
mGetLatestPostsTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, start);
}
/**
* Toggle progress bar visibility
@ -204,85 +260,4 @@ 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;
//Get information about the users
ArrayMap<Integer, UserInfo> usersInfo
= mUserHelper.getMultiple(postsList.getUsersId());
//Check for errors
if(usersInfo == null)
return null;
assert postsList.getUsersInfo() != null;
postsList.getUsersInfo().putAll(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);
if(posts == null){
Toast.makeText(getActivity(), R.string.err_get_older_posts,
Toast.LENGTH_SHORT).show();
return;
}
mPostsList.addAll(posts);
assert mPostsList.getUsersInfo() != null;
mPostsList.getUsersInfo().putAll(posts.getUsersInfo());
//Apply new posts list
mPostsListFragment.show();
}
}
}