我的应用程序中有一个 recyclerView 可以加载视频和图像。我正在使用 ExoPlayer 库将视频加载到我的回收站 View 中。问题是有时 ExoPlayer 显示黑屏而不是加载视频。我尝试从 firebase 记录视频 url，但它不是 null 或类似的东西。
我正在使用这个库: https://github.com/HamidrezaAmz/MagicalExoPlayer
注意:当我使用 firebase 和 recyclerView 实现分页(滚动加载更多帖子)时出现此问题。
我的 HomeFragment:
public class HomeFragment extends Fragment {
LoadingDialog progressDialog;
final DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
boolean isSearchOpen = false;
private EditText searchView;
ArrayList<PostModel> postModelArrayList;
ArrayList<PostModel> loadedPostsArrayList;
RecyclerView recyclerView;
PostRecyclerAdapter recyclerAdapter;
int lastLoadedIndex = 0;
void loadMorePosts() {
// Load 4 post's per time
for (int i = 0; i < 3; i++) {
if (lastLoadedIndex + 1 < postModelArrayList.size()) {
PostModel postModel = postModelArrayList.get(lastLoadedIndex + 1);
loadedPostsArrayList.add(postModel);
recyclerAdapter.notifyDataSetChanged();
lastLoadedIndex = lastLoadedIndex + 1;
}
}
}
void loadAllPosts(View fragmentView) {
DatabaseReference postsRef = FirebaseDatabase.getInstance().getReference("posts");
postsRef.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot snapshot) {
new Handler().postDelayed(() -> {
fragmentView.findViewById(R.id.constraintLayout2).setVisibility(View.GONE);
HomeActivity.bottomNavBar.setVisibility(View.VISIBLE);
HomeActivity.showLoadingScreen = false;
}, 1200);
for (DataSnapshot postSnapshot : snapshot.getChildren()) {
PostModel postModel = postSnapshot.getValue(PostModel.class);
// Show post in recycler adapter only if the user is not blocked
if (!snapshot.child("users").child(FirebaseAuth.getInstance().getCurrentUser().getUid()).child("blockedUsers").child(postSnapshot.child("name").getValue(String.class)).exists()) {
postModelArrayList.add(postModel);
}
recyclerAdapter.notifyDataSetChanged();
}
// Reverse elements inside postModelArrayList
Collections.reverse(postModelArrayList);
// Load first 3 post's
for (int i = 0; i < 3; i++) {
loadedPostsArrayList.add(postModelArrayList.get(i));
lastLoadedIndex++;
}
}
@Override
public void onCancelled(@NonNull DatabaseError error) {
Toast.makeText(getContext(), "Error: " + error.getMessage(), Toast.LENGTH_SHORT).show();
}
});
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_home, container, false);
SwipeRefreshLayout swipeRefreshLayout = view.findViewById(R.id.root_view);
TextView usernameLoadingScreen = view.findViewById(R.id.textView40);
ImageButton searchUserBtn = view.findViewById(R.id.searchPersonButton);
ImageButton notificationsBtn = view.findViewById(R.id.notificationsButton);
ImageButton searchUserButton = view.findViewById(R.id.enter_search_button);
View postsOfTheMonthBtn = view.findViewById(R.id.posts_of_the_month_btn);
searchView = view.findViewById(R.id.search_view);
recyclerView = view.findViewById(R.id.home_recycler_view);
loadedPostsArrayList = new ArrayList<>();
final LinearLayoutManager layoutManager = new LinearLayoutManager(getContext());
recyclerAdapter = new PostRecyclerAdapter(loadedPostsArrayList, getContext(), getActivity());
recyclerView.setAdapter(recyclerAdapter);
recyclerView.setLayoutManager(layoutManager);
progressDialog = LoadingDialog.Companion.get(getActivity());
searchView.setVisibility(View.GONE);
searchUserButton.setVisibility(View.GONE);
if (HomeActivity.showWhatsNewMessage) {
FirebaseInAppMessaging.getInstance().triggerEvent("new_version_open");
}
// Avoid data refresh on every swipe down
recyclerView.setOnScrollChangeListener((v, scrollX, scrollY, oldScrollX, oldScrollY) ->
swipeRefreshLayout.setEnabled(scrollY <= 5));
// Re-load data
swipeRefreshLayout.setOnRefreshListener(() -> {
swipeRefreshLayout.setRefreshing(true);
loadAllPosts(view);
swipeRefreshLayout.setRefreshing(false);
});
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
loadMorePosts();
}
});
HomeActivity.bottomNavBar.setVisibility(View.GONE);
loadAllPosts(view);
return view;
}
}
我的 PostRecyclerAdapter:
public class PostRecyclerAdapter extends RecyclerView.Adapter {
List<PostModel> postList;
Context context;
Activity activity;
@Override
public int getItemViewType(int position) {
if (postList.get(position).getPostType().equals("video")) {
return 1;
}
return 0;
}
public void addAll(List<PostModel> newPosts) {
int initSize = postList.size();
postList.addAll(newPosts);
notifyItemRangeChanged(initSize, postList.size());
}
public String getLastItemID() {
return postList.get(postList.size() - 1).getId();
}
public PostRecyclerAdapter(ArrayList<PostModel> postModelArrayList, Context context, Activity activity) {
this.postList = postModelArrayList;
this.context = context;
this.activity = activity;
}
@NonNull
@Override
public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
if (viewType == 1) {
return new VideoViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.post_video_item, parent, false));
}
return new ImageViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.post_item, parent, false));
}
@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
DatabaseReference likeRef = FirebaseDatabase.getInstance().getReference("likes");
FirebaseAuth mAuth = FirebaseAuth.getInstance();
FirebaseUser user = mAuth.getCurrentUser();
if (postList.get(position).getPostType().equals("video")) {
// bind video view holder
VideoViewHolder videoViewHolder = (VideoViewHolder) holder;
videoViewHolder.setContext(context);
// check if post is liked or not
likeRef.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull @NotNull DataSnapshot snapshot) {
if (!HomeActivity.anonymous) {
// check if current post is liked from this user
if (snapshot.child(videoViewHolder.id).hasChild(user.getUid())) {
// post is liked form this user
videoViewHolder.like_btn.setImageResource(R.drawable.ic_thumb_up_filled);
} else {
// post is not liked from this user
videoViewHolder.like_btn.setImageResource(R.drawable.ic_thump_up_outline);
}
} else {
// disable like button
videoViewHolder.like_btn.setEnabled(false);
}
}
@Override
public void onCancelled(@NonNull @NotNull DatabaseError error) {
Toast.makeText(context, "error: " + error, Toast.LENGTH_SHORT).show();
}
});
// Get current post id set username, authorID, profile picture URL, postType, likes and post image URL
videoViewHolder.id = postList.get(position).getId();
videoViewHolder.username.setText(postList.get(position).getName());
videoViewHolder.userID = postList.get(position).getAuthorID();
videoViewHolder.like_counter_tv.setText(postList.get(position).getLikes());
videoViewHolder.videoURL = postList.get(position).getImgUrl();
// Load video source
HashMap<String, String> extraHeaders = new HashMap<>();
extraHeaders.put("foo", "bar");
videoViewHolder.andExoPlayerView.setSource(postList.get(position).getImgUrl(), extraHeaders);
videoViewHolder.andExoPlayerView.setPlayWhenReady(false);
videoViewHolder.andExoPlayerView.setAspectRatio(EnumAspectRatio.ASPECT_16_9);
// Load profile picture
String profilePictureUrl = postList.get(position).getProfileImgUrl();
if (profilePictureUrl != null) {
if (!profilePictureUrl.equals("none")) {
Glide.with(context).load(profilePictureUrl).into(videoViewHolder.profilePicture);
}
}
} else {
// bind image view holder
ImageViewHolder imageViewHolder = (ImageViewHolder) holder;
imageViewHolder.setContext(context);
// check if post is liked or not
likeRef.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull @NotNull DataSnapshot snapshot) {
if (!HomeActivity.anonymous) {
// check if current post is liked from this user
if (snapshot.child(imageViewHolder.postID).hasChild(user.getUid())) {
// post is liked form this user
imageViewHolder.like_btn.setImageResource(R.drawable.ic_thumb_up_filled);
} else {
// post is not liked from this user
imageViewHolder.like_btn.setImageResource(R.drawable.ic_thump_up_outline);
}
} else {
// disable like button
imageViewHolder.like_btn.setEnabled(false);
}
}
@Override
public void onCancelled(@NonNull @NotNull DatabaseError error) {
Toast.makeText(context, "error: " + error, Toast.LENGTH_SHORT).show();
}
});
// Get current post id set username, authorID, profile picture URL, postType, likes and post image URL
imageViewHolder.postID = postList.get(position).getId();
imageViewHolder.username.setText(postList.get(position).getName());
imageViewHolder.userID = postList.get(position).getAuthorID();
imageViewHolder.like_counter_tv.setText(postList.get(position).getLikes());
Picasso.get().load(postList.get(position).getImgUrl()).into(imageViewHolder.postImg);
imageViewHolder.postImageURL = postList.get(position).getImgUrl();
// Load profile picture
String profilePictureUrl = postList.get(position).getProfileImgUrl();
if (profilePictureUrl != null) {
if (!profilePictureUrl.equals("none")) {
Glide.with(context).load(profilePictureUrl).into(imageViewHolder.profileImage);
}
}
}
}
@Override
public int getItemCount() {
return postList.size();
}
}
我的 video_post_item.xml:
<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/video_container"
android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_margin="12dp"
app:cardElevation="8dp"
app:cardCornerRadius="10dp">
<androidx.constraintlayout.widget.ConstraintLayout
android:id="@+id/sContainer"
android:layout_width="match_parent"
android:background="?attr/cardBackgroundColor"
android:layout_height="wrap_content">
<de.hdodenhof.circleimageview.CircleImageView
android:id="@+id/circleImageView2"
android:layout_width="35dp"
android:layout_height="35dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:src="@drawable/user"
app:layout_constraintEnd_toStartOf="@+id/textView27"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/textView27"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:text="username"
android:textColor="?attr/titleTextColor"
android:textSize="17sp"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="@+id/circleImageView2"
app:layout_constraintStart_toEndOf="@+id/circleImageView2"
app:layout_constraintTop_toTopOf="@+id/circleImageView2" />
<com.potyvideo.library.AndExoPlayerView
android:id="@+id/andExoPlayerView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
app:andexo_show_full_screen="true"
app:keep_content_on_player_reset="true"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView27"
app:layout_constraintVertical_bias="1.0" />
<ImageButton
android:id="@+id/imageButton8"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="15dp"
android:background="@null"
app:layout_constraintBottom_toBottomOf="@+id/textView27"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="@+id/textView27"
app:srcCompat="@drawable/ic_thumb_up" />
<TextView
android:id="@+id/textView36"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:text="0"
android:textColor="?attr/titleTextColor"
android:textSize="18sp"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="@+id/imageButton8"
app:layout_constraintEnd_toStartOf="@+id/imageButton8"
app:layout_constraintTop_toTopOf="@+id/imageButton8" />
<View
android:id="@+id/view5"
android:layout_width="200dp"
android:layout_height="55dp"
android:focusable="true"
android:foreground="?selectableItemBackgroundBorderless"
app:layout_constraintBottom_toTopOf="@+id/andExoPlayerView"
app:layout_constraintEnd_toEndOf="@+id/textView27"
app:layout_constraintStart_toStartOf="@+id/circleImageView2"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.cardview.widget.CardView>
最佳答案
将 addview 方法从 onScrollStateChanged 移动到 exoplayer 的 onPlayerStateChanged 方法。通过在 onscrollstatechanged 中添加 View ，它试图在每一分之一秒内添加 View 。
此外，添加一个处理程序，如果未添加 View ，它会不断检查变量的状态，然后添加 View ，这样，大部分时间通过 onPlayerStateChanged 方法或处理程序添加 View 。它在大多数情况下都解决了，但仍然不是 100%。
在这里我添加了一个对问题的引用 https://github.com/google/ExoPlayer/issues/7750
关于java - ExoPlayer 显示黑屏而不是加载视频(仅有时)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/71243169/