From 6b61c92a7e96e2d0ad6c1a6a83331ad28496e602 Mon Sep 17 00:00:00 2001
From: Stefan Schueller <sschueller@nunight.com>
Date: Sat, 3 Mar 2018 02:02:00 +0100
Subject: [PATCH] Added Endless Scrolling

---
 .../peertube/activity/VideoListActivity.java  | 81 ++++++++++++-------
 .../peertube/adapter/VideoAdapter.java        | 14 +++-
 2 files changed, 63 insertions(+), 32 deletions(-)

diff --git a/app/src/main/java/net/schueller/peertube/activity/VideoListActivity.java b/app/src/main/java/net/schueller/peertube/activity/VideoListActivity.java
index 6e58567..dc89b07 100644
--- a/app/src/main/java/net/schueller/peertube/activity/VideoListActivity.java
+++ b/app/src/main/java/net/schueller/peertube/activity/VideoListActivity.java
@@ -9,7 +9,6 @@ import android.support.v7.widget.RecyclerView;
 import android.util.Log;
 import android.widget.Toast;
 
-
 import com.google.android.gms.common.GooglePlayServicesNotAvailableException;
 import com.google.android.gms.common.GooglePlayServicesRepairableException;
 import com.google.android.gms.common.GooglePlayServicesUtil;
@@ -20,24 +19,25 @@ import net.schueller.peertube.adapter.VideoAdapter;
 import net.schueller.peertube.model.VideoList;
 import net.schueller.peertube.network.GetVideoDataService;
 import net.schueller.peertube.network.RetrofitInstance;
-import net.schueller.peertube.services.RecentlyAddedVideosService;
-import net.schueller.peertube.model.Video;
 
 
 import java.util.ArrayList;
-import java.util.List;
 
 import retrofit2.Call;
 import retrofit2.Callback;
 import retrofit2.Response;
 
-import static org.webrtc.ContextUtils.getApplicationContext;
-
 public class VideoListActivity extends AppCompatActivity {
 
     private VideoAdapter videoAdapter;
     private RecyclerView recyclerView;
 
+    private int currentStart = 0;
+    private int count = 12;
+    private String sort = "-createdAt";
+
+    private boolean isLoading = false;
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -46,11 +46,52 @@ public class VideoListActivity extends AppCompatActivity {
         // fix android trying to use SSLv3 for handshake
         updateAndroidSecurityProvider(this);
 
-        /*Create handle for the RetrofitInstance interface*/
+        createList();
+
+    }
+
+
+    private void createList() {
+        recyclerView = findViewById(R.id.recyclerView);
+
+        RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(VideoListActivity.this);
+        recyclerView.setLayoutManager(layoutManager);
+
+        videoAdapter = new VideoAdapter(new ArrayList<>(), VideoListActivity.this);
+        recyclerView.setAdapter(videoAdapter);
+
+        loadVideos(currentStart, count, sort);
+
+        recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
+            @Override
+            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
+                super.onScrollStateChanged(recyclerView, newState);
+            }
+
+            @Override
+            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
+
+                if (dy > 0) {
+                    // is at end of list?
+                    if(!recyclerView.canScrollVertically(RecyclerView.FOCUS_DOWN)){
+                        if (!isLoading) {
+                            currentStart = currentStart + count;
+                            loadVideos(currentStart, count, sort);
+                        }
+                    }
+                }
+
+            }
+        });
+    }
+
+    private void loadVideos(int start, int count, String sort) {
+
+        isLoading = true;
+
         GetVideoDataService service = RetrofitInstance.getRetrofitInstance().create(GetVideoDataService.class);
 
-        /*Call the method with parameter in the interface to get the employee data*/
-        Call<VideoList> call = service.getVideoData(0, 12, "-createdAt");
+        Call<VideoList> call = service.getVideoData(start, count, sort);
 
         /*Log the URL called*/
         Log.wtf("URL Called", call.request().url() + "");
@@ -58,35 +99,19 @@ public class VideoListActivity extends AppCompatActivity {
         call.enqueue(new Callback<VideoList>() {
             @Override
             public void onResponse(Call<VideoList> call, Response<VideoList> response) {
-                Log.wtf("Response", response + "");
-                generateVideoList(response.body().getVideoArrayList());
+                videoAdapter.setData(response.body().getVideoArrayList());
+                isLoading = false;
             }
 
             @Override
             public void onFailure(Call<VideoList> call, Throwable t) {
                 Log.wtf("err", t.fillInStackTrace());
                 Toast.makeText(VideoListActivity.this, "Something went wrong...Please try later!", Toast.LENGTH_SHORT).show();
+                isLoading = false;
             }
         });
-
-
     }
 
-
-    /*Method to generate List of employees using RecyclerView with custom adapter*/
-    private void generateVideoList(ArrayList<Video> vidDataList) {
-        recyclerView = findViewById(R.id.recyclerView);
-
-        videoAdapter = new VideoAdapter(vidDataList, VideoListActivity.this);
-
-        RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(VideoListActivity.this);
-
-        recyclerView.setLayoutManager(layoutManager);
-
-        recyclerView.setAdapter(videoAdapter);
-    }
-
-
     /**
      * Force android to not use SSLv3
      *
diff --git a/app/src/main/java/net/schueller/peertube/adapter/VideoAdapter.java b/app/src/main/java/net/schueller/peertube/adapter/VideoAdapter.java
index 0615558..da2aab4 100644
--- a/app/src/main/java/net/schueller/peertube/adapter/VideoAdapter.java
+++ b/app/src/main/java/net/schueller/peertube/adapter/VideoAdapter.java
@@ -3,12 +3,10 @@ package net.schueller.peertube.adapter;
 import android.content.Context;
 import android.support.annotation.NonNull;
 import android.support.v7.widget.RecyclerView;
-import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ImageView;
-import android.widget.LinearLayout;
 import android.widget.TextView;
 
 import com.squareup.picasso.Picasso;
@@ -18,6 +16,8 @@ import net.schueller.peertube.model.Video;
 
 import java.util.ArrayList;
 
+import static java.util.Collections.addAll;
+
 public class VideoAdapter extends RecyclerView.Adapter<VideoAdapter.VideoViewHolder> {
 
 
@@ -29,15 +29,16 @@ public class VideoAdapter extends RecyclerView.Adapter<VideoAdapter.VideoViewHol
         this.context = context;
     }
 
+    @NonNull
     @Override
-    public VideoViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
+    public VideoViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
         LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext());
         View view = layoutInflater.inflate(R.layout.row_video, parent, false);
         return new VideoViewHolder(view);
     }
 
     @Override
-    public void onBindViewHolder(VideoViewHolder holder, int position) {
+    public void onBindViewHolder(@NonNull VideoViewHolder holder, int position) {
 
         Picasso.with(this.context)
                 .load("https://troll.tv" + videoList.get(position).getPreviewPath())
@@ -47,6 +48,11 @@ public class VideoAdapter extends RecyclerView.Adapter<VideoAdapter.VideoViewHol
         holder.description.setText(videoList.get(position).getDescription());
     }
 
+    public void setData(ArrayList<Video> data) {
+        videoList.addAll(data);
+        this.notifyDataSetChanged();
+    }
+
     @Override
     public int getItemCount() {
         return videoList.size();