我想在图像加载之前显示进度条。我正在从Firebase存储中获取图像。一段时间的图像需要花费更多的时间来加载和显示.....这就是为什么我试图在加载图像之前输入进度条...谁能帮我解决这个问题？
请在下面检查我的代码：-
public class PostAdapter extends RecyclerView.Adapter<PostAdapter.ViewHolder> {
public Context mContext;
private List <Post>mPost;
private FirebaseUser firebaseUser;
ProgressBar progressBar;
public PostAdapter(Context mContext, List<Post> mPost) {
this.mContext = mContext;
this.mPost = mPost;
}
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view= LayoutInflater.from(mContext).inflate(R.layout.post_item,parent,false);
return new PostAdapter.ViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull final ViewHolder holder, final int position) {
firebaseUser= FirebaseAuth.getInstance().getCurrentUser();
final Post post=mPost.get(position);
try {
Glide.with(mContext.getApplicationContext()).load(post.getPostimage()).into(holder.post_image);
}catch (Exception e)
{
}
//holder.time.setText(post.getTime());
Get_Time_ago getTimeAgo=new Get_Time_ago();
long lastTime=Long.parseLong(String.valueOf(post.timestamp));
String last_seen_time=getTimeAgo.getTimeAgo(lastTime,mContext);
holder. time.setText(last_seen_time);
/*SimpleDateFormat sfd = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss");
String time=sfd.format(new Date(lastseenonline));
mLast_seenview.setText(time);*/
if(post.getDescription().equals("")){
holder.description.setVisibility(View.GONE);
}else {
holder.description.setVisibility(View.VISIBLE);
holder.description.setText(post.getDescription());
}
publisherInfo(holder.image_profile,holder.username,holder.blood,holder.publisher,post.getPublisher());
if(post.getPublisher().equals(firebaseUser.getUid())){
holder.delete.setVisibility(View.VISIBLE);
}else {
holder.delete.setVisibility(View.GONE);
}
holder.delete.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
alertDialog.setTitle("Confirm Delete?");
alertDialog.setMessage("Do you want to delete your post?");
alertDialog.setPositiveButton("YES", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
FirebaseDatabase.getInstance().getReference("posts").child(post.getPostid()).removeValue();
notify();
}
});
alertDialog.setNegativeButton("NO", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
alertDialog.show();
}
});
}
@Override
public int getItemCount() {
return mPost.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
public ImageView image_profile,post_image,like,dislike,comment,save,delete;
public TextView username,blood,likes,dislikes,comments, description,publisher,time;
public ViewHolder(@NonNull View itemView) {
super(itemView);
image_profile=itemView.findViewById(R.id.image_profile);
post_image=itemView.findViewById(R.id.post_image);
like=itemView.findViewById(R.id.like);
comment=itemView.findViewById(R.id.comment);
save=itemView.findViewById(R.id.save);
delete=itemView.findViewById(R.id.delete);
username=itemView.findViewById(R.id.username);
blood=itemView.findViewById(R.id.blood);
time=itemView.findViewById(R.id.time);
likes=itemView.findViewById(R.id.likes);
dislikes=itemView.findViewById(R.id.dislikes);
dislike=itemView.findViewById(R.id.dislike);
comments=itemView.findViewById(R.id.comments);
description=itemView.findViewById(R.id.description);
publisher=itemView.findViewById(R.id.publisher);
progressBar = (ProgressBar) itemView.findViewById(R.id.progressBar);
}
}
private void publisherInfo (final ImageView image_profile, final TextView username,final TextView blood, final TextView publisher, final String userId ){
DatabaseReference reference= FirebaseDatabase.getInstance().getReference("Users").child(userId);
reference.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
try {
User user=dataSnapshot.getValue(User.class);
Glide.with(mContext.getApplicationContext()).load(user.getImageurl()).into(image_profile);
username.setText(user.getUsername());
blood.setText(user.getBlood());
publisher.setText(user.getUsername());
}catch (Exception e){
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
}
答案 0 :(得分：1)
您可以使用Glides占位符中的CircularProgressDrawable显示载荷。我从我的小项目复制了它，它在Kotlin，但是很容易：
fun AppCompatImageView.loadImage(imageUri: String) {
val circularProgressDrawable = CircularProgressDrawable(context)
circularProgressDrawable.strokeWidth = 5f
circularProgressDrawable.centerRadius = 30f
circularProgressDrawable.start()
Glide.with(context)
.load(imageUri)
.placeholder(circularProgressDrawable)
.error(R.drawable.ic_close_black)
.override(200, 300)
.into(this)
}
评论后更新... Java代码：
void loadImage(AppCompatImageView yourImageView, String imageUri) {
CircularProgressDrawable circularProgressDrawable = new CircularProgressDrawable(yourImageView.getContext())
circularProgressDrawable.setStrokeWidth(5f);
circularProgressDrawable.setCenterRadius(30f);
circularProgressDrawable.start();
Glide.with(yourImageView)
.load(imageUri)
.placeholder(circularProgressDrawable)
.error(R.drawable.ic_close_black)
.override(200, 300)
.into(yourImageView);
}
答案 1 :(得分：0)
在Java中类似：
print("Text here", end="")